* [PATCH v11 perf, bpf-next 1/9] perf, bpf: Introduce PERF_RECORD_KSYMBOL
2019-01-17 16:15 [PATCH v11 perf, bpf-next 0/9] reveal invisible bpf programs Song Liu
@ 2019-01-17 16:15 ` Song Liu
2019-01-22 10:18 ` [tip:perf/core] " tip-bot for Song Liu
2019-01-17 16:15 ` [PATCH v11 perf, bpf-next 2/9] sync tools/include/uapi/linux/perf_event.h Song Liu
` (7 subsequent siblings)
8 siblings, 1 reply; 33+ messages in thread
From: Song Liu @ 2019-01-17 16:15 UTC (permalink / raw)
To: linux-kernel, netdev; +Cc: Song Liu, peterz, acme, ast, daniel, kernel-team
For better performance analysis of dynamically JITed and loaded kernel
functions, such as BPF programs, this patch introduces
PERF_RECORD_KSYMBOL, a new perf_event_type that exposes kernel symbol
register/unregister information to user space.
The following data structure is used for PERF_RECORD_KSYMBOL.
/*
* struct {
* struct perf_event_header header;
* u64 addr;
* u32 len;
* u16 ksym_type;
* u16 flags;
* char name[];
* struct sample_id sample_id;
* };
*/
Reviewed-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Song Liu <songliubraving@fb.com>
---
include/linux/perf_event.h | 8 +++
include/uapi/linux/perf_event.h | 26 ++++++++-
kernel/events/core.c | 98 ++++++++++++++++++++++++++++++++-
3 files changed, 130 insertions(+), 2 deletions(-)
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 1d5c551a5add..b46d11d8d79c 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -1113,6 +1113,10 @@ static inline void perf_event_task_sched_out(struct task_struct *prev,
}
extern void perf_event_mmap(struct vm_area_struct *vma);
+
+extern void perf_event_ksymbol(u16 ksym_type, u64 addr, u32 len,
+ bool unregister, const char *sym);
+
extern struct perf_guest_info_callbacks *perf_guest_cbs;
extern int perf_register_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks);
extern int perf_unregister_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks);
@@ -1333,6 +1337,10 @@ static inline int perf_unregister_guest_info_callbacks
(struct perf_guest_info_callbacks *callbacks) { return 0; }
static inline void perf_event_mmap(struct vm_area_struct *vma) { }
+
+typedef int (perf_ksymbol_get_name_f)(char *name, int name_len, void *data);
+static inline void perf_event_ksymbol(u16 ksym_type, u64 addr, u32 len,
+ bool unregister, const char *sym) { }
static inline void perf_event_exec(void) { }
static inline void perf_event_comm(struct task_struct *tsk, bool exec) { }
static inline void perf_event_namespaces(struct task_struct *tsk) { }
diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
index 9de8780ac8d9..68c4da0227c5 100644
--- a/include/uapi/linux/perf_event.h
+++ b/include/uapi/linux/perf_event.h
@@ -372,7 +372,8 @@ struct perf_event_attr {
context_switch : 1, /* context switch data */
write_backward : 1, /* Write ring buffer from end to beginning */
namespaces : 1, /* include namespaces data */
- __reserved_1 : 35;
+ ksymbol : 1, /* include ksymbol events */
+ __reserved_1 : 34;
union {
__u32 wakeup_events; /* wakeup every n events */
@@ -965,9 +966,32 @@ enum perf_event_type {
*/
PERF_RECORD_NAMESPACES = 16,
+ /*
+ * Record ksymbol register/unregister events:
+ *
+ * struct {
+ * struct perf_event_header header;
+ * u64 addr;
+ * u32 len;
+ * u16 ksym_type;
+ * u16 flags;
+ * char name[];
+ * struct sample_id sample_id;
+ * };
+ */
+ PERF_RECORD_KSYMBOL = 17,
+
PERF_RECORD_MAX, /* non-ABI */
};
+enum perf_record_ksymbol_type {
+ PERF_RECORD_KSYMBOL_TYPE_UNKNOWN = 0,
+ PERF_RECORD_KSYMBOL_TYPE_BPF = 1,
+ PERF_RECORD_KSYMBOL_TYPE_MAX /* non-ABI */
+};
+
+#define PERF_RECORD_KSYMBOL_FLAGS_UNREGISTER (1 << 0)
+
#define PERF_MAX_STACK_DEPTH 127
#define PERF_MAX_CONTEXTS_PER_STACK 8
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 3cd13a30f732..64480a4ae2e2 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -385,6 +385,7 @@ static atomic_t nr_namespaces_events __read_mostly;
static atomic_t nr_task_events __read_mostly;
static atomic_t nr_freq_events __read_mostly;
static atomic_t nr_switch_events __read_mostly;
+static atomic_t nr_ksymbol_events __read_mostly;
static LIST_HEAD(pmus);
static DEFINE_MUTEX(pmus_lock);
@@ -4235,7 +4236,7 @@ static bool is_sb_event(struct perf_event *event)
if (attr->mmap || attr->mmap_data || attr->mmap2 ||
attr->comm || attr->comm_exec ||
- attr->task ||
+ attr->task || attr->ksymbol ||
attr->context_switch)
return true;
return false;
@@ -4305,6 +4306,8 @@ static void unaccount_event(struct perf_event *event)
dec = true;
if (has_branch_stack(event))
dec = true;
+ if (event->attr.ksymbol)
+ atomic_dec(&nr_ksymbol_events);
if (dec) {
if (!atomic_add_unless(&perf_sched_count, -1, 1))
@@ -7650,6 +7653,97 @@ static void perf_log_throttle(struct perf_event *event, int enable)
perf_output_end(&handle);
}
+/*
+ * ksymbol register/unregister tracking
+ */
+
+struct perf_ksymbol_event {
+ const char *name;
+ int name_len;
+ struct {
+ struct perf_event_header header;
+ u64 addr;
+ u32 len;
+ u16 ksym_type;
+ u16 flags;
+ } event_id;
+};
+
+static int perf_event_ksymbol_match(struct perf_event *event)
+{
+ return event->attr.ksymbol;
+}
+
+static void perf_event_ksymbol_output(struct perf_event *event, void *data)
+{
+ struct perf_ksymbol_event *ksymbol_event = data;
+ struct perf_output_handle handle;
+ struct perf_sample_data sample;
+ int ret;
+
+ if (!perf_event_ksymbol_match(event))
+ return;
+
+ perf_event_header__init_id(&ksymbol_event->event_id.header,
+ &sample, event);
+ ret = perf_output_begin(&handle, event,
+ ksymbol_event->event_id.header.size);
+ if (ret)
+ return;
+
+ perf_output_put(&handle, ksymbol_event->event_id);
+ __output_copy(&handle, ksymbol_event->name, ksymbol_event->name_len);
+ perf_event__output_id_sample(event, &handle, &sample);
+
+ perf_output_end(&handle);
+}
+
+void perf_event_ksymbol(u16 ksym_type, u64 addr, u32 len, bool unregister,
+ const char *sym)
+{
+ struct perf_ksymbol_event ksymbol_event;
+ char name[KSYM_NAME_LEN];
+ u16 flags = 0;
+ int name_len;
+
+ if (!atomic_read(&nr_ksymbol_events))
+ return;
+
+ if (ksym_type >= PERF_RECORD_KSYMBOL_TYPE_MAX ||
+ ksym_type == PERF_RECORD_KSYMBOL_TYPE_UNKNOWN)
+ goto err;
+
+ strlcpy(name, sym, KSYM_NAME_LEN);
+ name_len = strlen(name) + 1;
+ while (!IS_ALIGNED(name_len, sizeof(u64)))
+ name[name_len++] = '\0';
+ BUILD_BUG_ON(KSYM_NAME_LEN % sizeof(u64));
+
+ if (unregister)
+ flags |= PERF_RECORD_KSYMBOL_FLAGS_UNREGISTER;
+
+ ksymbol_event = (struct perf_ksymbol_event){
+ .name = name,
+ .name_len = name_len,
+ .event_id = {
+ .header = {
+ .type = PERF_RECORD_KSYMBOL,
+ .size = sizeof(ksymbol_event.event_id) +
+ name_len,
+ },
+ .addr = addr,
+ .len = len,
+ .ksym_type = ksym_type,
+ .flags = flags,
+ },
+ };
+
+ perf_iterate_sb(perf_event_ksymbol_output, &ksymbol_event, NULL);
+ return;
+err:
+ WARN_ONCE(1, "%s: Invalid KSYMBOL type 0x%x\n", __func__, ksym_type);
+}
+
void perf_event_itrace_started(struct perf_event *event)
{
event->attach_state |= PERF_ATTACH_ITRACE;
@@ -9900,6 +9994,8 @@ static void account_event(struct perf_event *event)
inc = true;
if (is_cgroup_event(event))
inc = true;
+ if (event->attr.ksymbol)
+ atomic_inc(&nr_ksymbol_events);
if (inc) {
/*
--
2.17.1
^ permalink raw reply related [flat|nested] 33+ messages in thread* [tip:perf/core] perf, bpf: Introduce PERF_RECORD_KSYMBOL
2019-01-17 16:15 ` [PATCH v11 perf, bpf-next 1/9] perf, bpf: Introduce PERF_RECORD_KSYMBOL Song Liu
@ 2019-01-22 10:18 ` tip-bot for Song Liu
0 siblings, 0 replies; 33+ messages in thread
From: tip-bot for Song Liu @ 2019-01-22 10:18 UTC (permalink / raw)
To: linux-tip-commits
Cc: linux-kernel, ast, acme, mingo, tglx, daniel, songliubraving,
hpa, peterz
Commit-ID: 76193a94522f1d4edf2447a536f3f796ce56343b
Gitweb: https://git.kernel.org/tip/76193a94522f1d4edf2447a536f3f796ce56343b
Author: Song Liu <songliubraving@fb.com>
AuthorDate: Thu, 17 Jan 2019 08:15:13 -0800
Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Mon, 21 Jan 2019 17:00:57 -0300
perf, bpf: Introduce PERF_RECORD_KSYMBOL
For better performance analysis of dynamically JITed and loaded kernel
functions, such as BPF programs, this patch introduces
PERF_RECORD_KSYMBOL, a new perf_event_type that exposes kernel symbol
register/unregister information to user space.
The following data structure is used for PERF_RECORD_KSYMBOL.
/*
* struct {
* struct perf_event_header header;
* u64 addr;
* u32 len;
* u16 ksym_type;
* u16 flags;
* char name[];
* struct sample_id sample_id;
* };
*/
Signed-off-by: Song Liu <songliubraving@fb.com>
Reviewed-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: kernel-team@fb.com
Cc: netdev@vger.kernel.org
Link: http://lkml.kernel.org/r/20190117161521.1341602-2-songliubraving@fb.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
include/linux/perf_event.h | 8 ++++
include/uapi/linux/perf_event.h | 26 ++++++++++-
kernel/events/core.c | 98 ++++++++++++++++++++++++++++++++++++++++-
3 files changed, 130 insertions(+), 2 deletions(-)
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 4eb88065a9b5..136fe0495374 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -1122,6 +1122,10 @@ static inline void perf_event_task_sched_out(struct task_struct *prev,
}
extern void perf_event_mmap(struct vm_area_struct *vma);
+
+extern void perf_event_ksymbol(u16 ksym_type, u64 addr, u32 len,
+ bool unregister, const char *sym);
+
extern struct perf_guest_info_callbacks *perf_guest_cbs;
extern int perf_register_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks);
extern int perf_unregister_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks);
@@ -1342,6 +1346,10 @@ static inline int perf_unregister_guest_info_callbacks
(struct perf_guest_info_callbacks *callbacks) { return 0; }
static inline void perf_event_mmap(struct vm_area_struct *vma) { }
+
+typedef int (perf_ksymbol_get_name_f)(char *name, int name_len, void *data);
+static inline void perf_event_ksymbol(u16 ksym_type, u64 addr, u32 len,
+ bool unregister, const char *sym) { }
static inline void perf_event_exec(void) { }
static inline void perf_event_comm(struct task_struct *tsk, bool exec) { }
static inline void perf_event_namespaces(struct task_struct *tsk) { }
diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
index ea19b5d491bf..1dee5c8f166b 100644
--- a/include/uapi/linux/perf_event.h
+++ b/include/uapi/linux/perf_event.h
@@ -372,7 +372,8 @@ struct perf_event_attr {
context_switch : 1, /* context switch data */
write_backward : 1, /* Write ring buffer from end to beginning */
namespaces : 1, /* include namespaces data */
- __reserved_1 : 35;
+ ksymbol : 1, /* include ksymbol events */
+ __reserved_1 : 34;
union {
__u32 wakeup_events; /* wakeup every n events */
@@ -963,9 +964,32 @@ enum perf_event_type {
*/
PERF_RECORD_NAMESPACES = 16,
+ /*
+ * Record ksymbol register/unregister events:
+ *
+ * struct {
+ * struct perf_event_header header;
+ * u64 addr;
+ * u32 len;
+ * u16 ksym_type;
+ * u16 flags;
+ * char name[];
+ * struct sample_id sample_id;
+ * };
+ */
+ PERF_RECORD_KSYMBOL = 17,
+
PERF_RECORD_MAX, /* non-ABI */
};
+enum perf_record_ksymbol_type {
+ PERF_RECORD_KSYMBOL_TYPE_UNKNOWN = 0,
+ PERF_RECORD_KSYMBOL_TYPE_BPF = 1,
+ PERF_RECORD_KSYMBOL_TYPE_MAX /* non-ABI */
+};
+
+#define PERF_RECORD_KSYMBOL_FLAGS_UNREGISTER (1 << 0)
+
#define PERF_MAX_STACK_DEPTH 127
#define PERF_MAX_CONTEXTS_PER_STACK 8
diff --git a/kernel/events/core.c b/kernel/events/core.c
index bc525cd1615c..e04ab5f325cf 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -385,6 +385,7 @@ static atomic_t nr_namespaces_events __read_mostly;
static atomic_t nr_task_events __read_mostly;
static atomic_t nr_freq_events __read_mostly;
static atomic_t nr_switch_events __read_mostly;
+static atomic_t nr_ksymbol_events __read_mostly;
static LIST_HEAD(pmus);
static DEFINE_MUTEX(pmus_lock);
@@ -4235,7 +4236,7 @@ static bool is_sb_event(struct perf_event *event)
if (attr->mmap || attr->mmap_data || attr->mmap2 ||
attr->comm || attr->comm_exec ||
- attr->task ||
+ attr->task || attr->ksymbol ||
attr->context_switch)
return true;
return false;
@@ -4305,6 +4306,8 @@ static void unaccount_event(struct perf_event *event)
dec = true;
if (has_branch_stack(event))
dec = true;
+ if (event->attr.ksymbol)
+ atomic_dec(&nr_ksymbol_events);
if (dec) {
if (!atomic_add_unless(&perf_sched_count, -1, 1))
@@ -7653,6 +7656,97 @@ static void perf_log_throttle(struct perf_event *event, int enable)
perf_output_end(&handle);
}
+/*
+ * ksymbol register/unregister tracking
+ */
+
+struct perf_ksymbol_event {
+ const char *name;
+ int name_len;
+ struct {
+ struct perf_event_header header;
+ u64 addr;
+ u32 len;
+ u16 ksym_type;
+ u16 flags;
+ } event_id;
+};
+
+static int perf_event_ksymbol_match(struct perf_event *event)
+{
+ return event->attr.ksymbol;
+}
+
+static void perf_event_ksymbol_output(struct perf_event *event, void *data)
+{
+ struct perf_ksymbol_event *ksymbol_event = data;
+ struct perf_output_handle handle;
+ struct perf_sample_data sample;
+ int ret;
+
+ if (!perf_event_ksymbol_match(event))
+ return;
+
+ perf_event_header__init_id(&ksymbol_event->event_id.header,
+ &sample, event);
+ ret = perf_output_begin(&handle, event,
+ ksymbol_event->event_id.header.size);
+ if (ret)
+ return;
+
+ perf_output_put(&handle, ksymbol_event->event_id);
+ __output_copy(&handle, ksymbol_event->name, ksymbol_event->name_len);
+ perf_event__output_id_sample(event, &handle, &sample);
+
+ perf_output_end(&handle);
+}
+
+void perf_event_ksymbol(u16 ksym_type, u64 addr, u32 len, bool unregister,
+ const char *sym)
+{
+ struct perf_ksymbol_event ksymbol_event;
+ char name[KSYM_NAME_LEN];
+ u16 flags = 0;
+ int name_len;
+
+ if (!atomic_read(&nr_ksymbol_events))
+ return;
+
+ if (ksym_type >= PERF_RECORD_KSYMBOL_TYPE_MAX ||
+ ksym_type == PERF_RECORD_KSYMBOL_TYPE_UNKNOWN)
+ goto err;
+
+ strlcpy(name, sym, KSYM_NAME_LEN);
+ name_len = strlen(name) + 1;
+ while (!IS_ALIGNED(name_len, sizeof(u64)))
+ name[name_len++] = '\0';
+ BUILD_BUG_ON(KSYM_NAME_LEN % sizeof(u64));
+
+ if (unregister)
+ flags |= PERF_RECORD_KSYMBOL_FLAGS_UNREGISTER;
+
+ ksymbol_event = (struct perf_ksymbol_event){
+ .name = name,
+ .name_len = name_len,
+ .event_id = {
+ .header = {
+ .type = PERF_RECORD_KSYMBOL,
+ .size = sizeof(ksymbol_event.event_id) +
+ name_len,
+ },
+ .addr = addr,
+ .len = len,
+ .ksym_type = ksym_type,
+ .flags = flags,
+ },
+ };
+
+ perf_iterate_sb(perf_event_ksymbol_output, &ksymbol_event, NULL);
+ return;
+err:
+ WARN_ONCE(1, "%s: Invalid KSYMBOL type 0x%x\n", __func__, ksym_type);
+}
+
void perf_event_itrace_started(struct perf_event *event)
{
event->attach_state |= PERF_ATTACH_ITRACE;
@@ -9912,6 +10006,8 @@ static void account_event(struct perf_event *event)
inc = true;
if (is_cgroup_event(event))
inc = true;
+ if (event->attr.ksymbol)
+ atomic_inc(&nr_ksymbol_events);
if (inc) {
/*
^ permalink raw reply related [flat|nested] 33+ messages in thread
* [PATCH v11 perf, bpf-next 2/9] sync tools/include/uapi/linux/perf_event.h
2019-01-17 16:15 [PATCH v11 perf, bpf-next 0/9] reveal invisible bpf programs Song Liu
2019-01-17 16:15 ` [PATCH v11 perf, bpf-next 1/9] perf, bpf: Introduce PERF_RECORD_KSYMBOL Song Liu
@ 2019-01-17 16:15 ` Song Liu
2019-01-22 10:18 ` [tip:perf/core] tools headers uapi: Sync tools/include/uapi/linux/perf_event.h tip-bot for Song Liu
2019-01-17 16:15 ` [PATCH v11 perf, bpf-next 3/9] perf, bpf: introduce PERF_RECORD_BPF_EVENT Song Liu
` (6 subsequent siblings)
8 siblings, 1 reply; 33+ messages in thread
From: Song Liu @ 2019-01-17 16:15 UTC (permalink / raw)
To: linux-kernel, netdev; +Cc: Song Liu, peterz, acme, ast, daniel, kernel-team
sync changes for PERF_RECORD_KSYMBOL
Reviewed-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Song Liu <songliubraving@fb.com>
---
tools/include/uapi/linux/perf_event.h | 26 +++++++++++++++++++++++++-
1 file changed, 25 insertions(+), 1 deletion(-)
diff --git a/tools/include/uapi/linux/perf_event.h b/tools/include/uapi/linux/perf_event.h
index 9de8780ac8d9..68c4da0227c5 100644
--- a/tools/include/uapi/linux/perf_event.h
+++ b/tools/include/uapi/linux/perf_event.h
@@ -372,7 +372,8 @@ struct perf_event_attr {
context_switch : 1, /* context switch data */
write_backward : 1, /* Write ring buffer from end to beginning */
namespaces : 1, /* include namespaces data */
- __reserved_1 : 35;
+ ksymbol : 1, /* include ksymbol events */
+ __reserved_1 : 34;
union {
__u32 wakeup_events; /* wakeup every n events */
@@ -965,9 +966,32 @@ enum perf_event_type {
*/
PERF_RECORD_NAMESPACES = 16,
+ /*
+ * Record ksymbol register/unregister events:
+ *
+ * struct {
+ * struct perf_event_header header;
+ * u64 addr;
+ * u32 len;
+ * u16 ksym_type;
+ * u16 flags;
+ * char name[];
+ * struct sample_id sample_id;
+ * };
+ */
+ PERF_RECORD_KSYMBOL = 17,
+
PERF_RECORD_MAX, /* non-ABI */
};
+enum perf_record_ksymbol_type {
+ PERF_RECORD_KSYMBOL_TYPE_UNKNOWN = 0,
+ PERF_RECORD_KSYMBOL_TYPE_BPF = 1,
+ PERF_RECORD_KSYMBOL_TYPE_MAX /* non-ABI */
+};
+
+#define PERF_RECORD_KSYMBOL_FLAGS_UNREGISTER (1 << 0)
+
#define PERF_MAX_STACK_DEPTH 127
#define PERF_MAX_CONTEXTS_PER_STACK 8
--
2.17.1
^ permalink raw reply related [flat|nested] 33+ messages in thread* [tip:perf/core] tools headers uapi: Sync tools/include/uapi/linux/perf_event.h
2019-01-17 16:15 ` [PATCH v11 perf, bpf-next 2/9] sync tools/include/uapi/linux/perf_event.h Song Liu
@ 2019-01-22 10:18 ` tip-bot for Song Liu
0 siblings, 0 replies; 33+ messages in thread
From: tip-bot for Song Liu @ 2019-01-22 10:18 UTC (permalink / raw)
To: linux-tip-commits
Cc: hpa, songliubraving, mingo, tglx, daniel, peterz, acme, ast,
linux-kernel
Commit-ID: d764ac6464915523e68e220b6aa4c3c2eb8e3f94
Gitweb: https://git.kernel.org/tip/d764ac6464915523e68e220b6aa4c3c2eb8e3f94
Author: Song Liu <songliubraving@fb.com>
AuthorDate: Thu, 17 Jan 2019 08:15:14 -0800
Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Mon, 21 Jan 2019 17:00:57 -0300
tools headers uapi: Sync tools/include/uapi/linux/perf_event.h
Sync changes for PERF_RECORD_KSYMBOL.
Signed-off-by: Song Liu <songliubraving@fb.com>
Reviewed-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: kernel-team@fb.com
Cc: netdev@vger.kernel.org
Link: http://lkml.kernel.org/r/20190117161521.1341602-3-songliubraving@fb.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/include/uapi/linux/perf_event.h | 26 +++++++++++++++++++++++++-
1 file changed, 25 insertions(+), 1 deletion(-)
diff --git a/tools/include/uapi/linux/perf_event.h b/tools/include/uapi/linux/perf_event.h
index ea19b5d491bf..1dee5c8f166b 100644
--- a/tools/include/uapi/linux/perf_event.h
+++ b/tools/include/uapi/linux/perf_event.h
@@ -372,7 +372,8 @@ struct perf_event_attr {
context_switch : 1, /* context switch data */
write_backward : 1, /* Write ring buffer from end to beginning */
namespaces : 1, /* include namespaces data */
- __reserved_1 : 35;
+ ksymbol : 1, /* include ksymbol events */
+ __reserved_1 : 34;
union {
__u32 wakeup_events; /* wakeup every n events */
@@ -963,9 +964,32 @@ enum perf_event_type {
*/
PERF_RECORD_NAMESPACES = 16,
+ /*
+ * Record ksymbol register/unregister events:
+ *
+ * struct {
+ * struct perf_event_header header;
+ * u64 addr;
+ * u32 len;
+ * u16 ksym_type;
+ * u16 flags;
+ * char name[];
+ * struct sample_id sample_id;
+ * };
+ */
+ PERF_RECORD_KSYMBOL = 17,
+
PERF_RECORD_MAX, /* non-ABI */
};
+enum perf_record_ksymbol_type {
+ PERF_RECORD_KSYMBOL_TYPE_UNKNOWN = 0,
+ PERF_RECORD_KSYMBOL_TYPE_BPF = 1,
+ PERF_RECORD_KSYMBOL_TYPE_MAX /* non-ABI */
+};
+
+#define PERF_RECORD_KSYMBOL_FLAGS_UNREGISTER (1 << 0)
+
#define PERF_MAX_STACK_DEPTH 127
#define PERF_MAX_CONTEXTS_PER_STACK 8
^ permalink raw reply related [flat|nested] 33+ messages in thread
* [PATCH v11 perf, bpf-next 3/9] perf, bpf: introduce PERF_RECORD_BPF_EVENT
2019-01-17 16:15 [PATCH v11 perf, bpf-next 0/9] reveal invisible bpf programs Song Liu
2019-01-17 16:15 ` [PATCH v11 perf, bpf-next 1/9] perf, bpf: Introduce PERF_RECORD_KSYMBOL Song Liu
2019-01-17 16:15 ` [PATCH v11 perf, bpf-next 2/9] sync tools/include/uapi/linux/perf_event.h Song Liu
@ 2019-01-17 16:15 ` Song Liu
2019-01-22 10:19 ` [tip:perf/core] perf, bpf: Introduce PERF_RECORD_BPF_EVENT tip-bot for Song Liu
2019-01-17 16:15 ` [PATCH v11 perf, bpf-next 4/9] sync tools/include/uapi/linux/perf_event.h Song Liu
` (5 subsequent siblings)
8 siblings, 1 reply; 33+ messages in thread
From: Song Liu @ 2019-01-17 16:15 UTC (permalink / raw)
To: linux-kernel, netdev; +Cc: Song Liu, peterz, acme, ast, daniel, kernel-team
For better performance analysis of BPF programs, this patch introduces
PERF_RECORD_BPF_EVENT, a new perf_event_type that exposes BPF program
load/unload information to user space.
Each BPF program may contain up to BPF_MAX_SUBPROGS (256) sub programs.
The following example shows kernel symbols for a BPF program with 7
sub programs:
ffffffffa0257cf9 t bpf_prog_b07ccb89267cf242_F
ffffffffa02592e1 t bpf_prog_2dcecc18072623fc_F
ffffffffa025b0e9 t bpf_prog_bb7a405ebaec5d5c_F
ffffffffa025dd2c t bpf_prog_a7540d4a39ec1fc7_F
ffffffffa025fcca t bpf_prog_05762d4ade0e3737_F
ffffffffa026108f t bpf_prog_db4bd11e35df90d4_F
ffffffffa0263f00 t bpf_prog_89d64e4abf0f0126_F
ffffffffa0257cf9 t bpf_prog_ae31629322c4b018__dummy_tracepoi
When a bpf program is loaded, PERF_RECORD_KSYMBOL is generated for
each of these sub programs. Therefore, PERF_RECORD_BPF_EVENT is not
needed for simple profiling.
For annotation, user space need to listen to PERF_RECORD_BPF_EVENT
and gather more information about these (sub) programs via sys_bpf.
Reviewed-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradeaed.org>
Signed-off-by: Song Liu <songliubraving@fb.com>
---
include/linux/filter.h | 7 ++
include/linux/perf_event.h | 6 ++
include/uapi/linux/perf_event.h | 29 +++++++-
kernel/bpf/core.c | 2 +-
kernel/bpf/syscall.c | 2 +
kernel/events/core.c | 115 ++++++++++++++++++++++++++++++++
6 files changed, 159 insertions(+), 2 deletions(-)
diff --git a/include/linux/filter.h b/include/linux/filter.h
index ad106d845b22..d531d4250bff 100644
--- a/include/linux/filter.h
+++ b/include/linux/filter.h
@@ -951,6 +951,7 @@ bpf_address_lookup(unsigned long addr, unsigned long *size,
void bpf_prog_kallsyms_add(struct bpf_prog *fp);
void bpf_prog_kallsyms_del(struct bpf_prog *fp);
+void bpf_get_prog_name(const struct bpf_prog *prog, char *sym);
#else /* CONFIG_BPF_JIT */
@@ -1006,6 +1007,12 @@ static inline void bpf_prog_kallsyms_add(struct bpf_prog *fp)
static inline void bpf_prog_kallsyms_del(struct bpf_prog *fp)
{
}
+
+static inline void bpf_get_prog_name(const struct bpf_prog *prog, char *sym)
+{
+ sym[0] = '\0';
+}
+
#endif /* CONFIG_BPF_JIT */
void bpf_prog_kallsyms_del_subprogs(struct bpf_prog *fp);
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index b46d11d8d79c..896f25b98cd7 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -1116,6 +1116,9 @@ extern void perf_event_mmap(struct vm_area_struct *vma);
extern void perf_event_ksymbol(u16 ksym_type, u64 addr, u32 len,
bool unregister, const char *sym);
+extern void perf_event_bpf_event(struct bpf_prog *prog,
+ enum perf_bpf_event_type type,
+ u16 flags);
extern struct perf_guest_info_callbacks *perf_guest_cbs;
extern int perf_register_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks);
@@ -1341,6 +1344,9 @@ static inline void perf_event_mmap(struct vm_area_struct *vma) { }
typedef int (perf_ksymbol_get_name_f)(char *name, int name_len, void *data);
static inline void perf_event_ksymbol(u16 ksym_type, u64 addr, u32 len,
bool unregister, const char *sym) { }
+static inline void perf_event_bpf_event(struct bpf_prog *prog,
+ enum perf_bpf_event_type type,
+ u16 flags) { }
static inline void perf_event_exec(void) { }
static inline void perf_event_comm(struct task_struct *tsk, bool exec) { }
static inline void perf_event_namespaces(struct task_struct *tsk) { }
diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
index 68c4da0227c5..8bd78a34e396 100644
--- a/include/uapi/linux/perf_event.h
+++ b/include/uapi/linux/perf_event.h
@@ -373,7 +373,8 @@ struct perf_event_attr {
write_backward : 1, /* Write ring buffer from end to beginning */
namespaces : 1, /* include namespaces data */
ksymbol : 1, /* include ksymbol events */
- __reserved_1 : 34;
+ bpf_event : 1, /* include bpf events */
+ __reserved_1 : 33;
union {
__u32 wakeup_events; /* wakeup every n events */
@@ -981,6 +982,25 @@ enum perf_event_type {
*/
PERF_RECORD_KSYMBOL = 17,
+ /*
+ * Record bpf events:
+ * enum perf_bpf_event_type {
+ * PERF_BPF_EVENT_UNKNOWN = 0,
+ * PERF_BPF_EVENT_PROG_LOAD = 1,
+ * PERF_BPF_EVENT_PROG_UNLOAD = 2,
+ * };
+ *
+ * struct {
+ * struct perf_event_header header;
+ * u16 type;
+ * u16 flags;
+ * u32 id;
+ * u8 tag[BPF_TAG_SIZE];
+ * struct sample_id sample_id;
+ * };
+ */
+ PERF_RECORD_BPF_EVENT = 18,
+
PERF_RECORD_MAX, /* non-ABI */
};
@@ -992,6 +1012,13 @@ enum perf_record_ksymbol_type {
#define PERF_RECORD_KSYMBOL_FLAGS_UNREGISTER (1 << 0)
+enum perf_bpf_event_type {
+ PERF_BPF_EVENT_UNKNOWN = 0,
+ PERF_BPF_EVENT_PROG_LOAD = 1,
+ PERF_BPF_EVENT_PROG_UNLOAD = 2,
+ PERF_BPF_EVENT_MAX, /* non-ABI */
+};
+
#define PERF_MAX_STACK_DEPTH 127
#define PERF_MAX_CONTEXTS_PER_STACK 8
diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c
index f908b9356025..19c49313c709 100644
--- a/kernel/bpf/core.c
+++ b/kernel/bpf/core.c
@@ -495,7 +495,7 @@ bpf_get_prog_addr_region(const struct bpf_prog *prog,
*symbol_end = addr + hdr->pages * PAGE_SIZE;
}
-static void bpf_get_prog_name(const struct bpf_prog *prog, char *sym)
+void bpf_get_prog_name(const struct bpf_prog *prog, char *sym)
{
const char *end = sym + KSYM_NAME_LEN;
const struct btf_type *type;
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index b155cd17c1bd..30ebd085790b 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -1211,6 +1211,7 @@ static void __bpf_prog_put_rcu(struct rcu_head *rcu)
static void __bpf_prog_put(struct bpf_prog *prog, bool do_idr_lock)
{
if (atomic_dec_and_test(&prog->aux->refcnt)) {
+ perf_event_bpf_event(prog, PERF_BPF_EVENT_PROG_UNLOAD, 0);
/* bpf_prog_free_id() must be called first */
bpf_prog_free_id(prog, do_idr_lock);
bpf_prog_kallsyms_del_all(prog);
@@ -1554,6 +1555,7 @@ static int bpf_prog_load(union bpf_attr *attr, union bpf_attr __user *uattr)
}
bpf_prog_kallsyms_add(prog);
+ perf_event_bpf_event(prog, PERF_BPF_EVENT_PROG_LOAD, 0);
return err;
free_used_maps:
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 64480a4ae2e2..0a8dab322111 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -386,6 +386,7 @@ static atomic_t nr_task_events __read_mostly;
static atomic_t nr_freq_events __read_mostly;
static atomic_t nr_switch_events __read_mostly;
static atomic_t nr_ksymbol_events __read_mostly;
+static atomic_t nr_bpf_events __read_mostly;
static LIST_HEAD(pmus);
static DEFINE_MUTEX(pmus_lock);
@@ -4308,6 +4309,8 @@ static void unaccount_event(struct perf_event *event)
dec = true;
if (event->attr.ksymbol)
atomic_dec(&nr_ksymbol_events);
+ if (event->attr.bpf_event)
+ atomic_dec(&nr_bpf_events);
if (dec) {
if (!atomic_add_unless(&perf_sched_count, -1, 1))
@@ -7744,6 +7747,116 @@ void perf_event_ksymbol(u16 ksym_type, u64 addr, u32 len, bool unregister,
WARN_ONCE(1, "%s: Invalid KSYMBOL type 0x%x\n", __func__, ksym_type);
}
+/*
+ * bpf program load/unload tracking
+ */
+
+struct perf_bpf_event {
+ struct bpf_prog *prog;
+ struct {
+ struct perf_event_header header;
+ u16 type;
+ u16 flags;
+ u32 id;
+ u8 tag[BPF_TAG_SIZE];
+ } event_id;
+};
+
+static int perf_event_bpf_match(struct perf_event *event)
+{
+ return event->attr.bpf_event;
+}
+
+static void perf_event_bpf_output(struct perf_event *event, void *data)
+{
+ struct perf_bpf_event *bpf_event = data;
+ struct perf_output_handle handle;
+ struct perf_sample_data sample;
+ int ret;
+
+ if (!perf_event_bpf_match(event))
+ return;
+
+ perf_event_header__init_id(&bpf_event->event_id.header,
+ &sample, event);
+ ret = perf_output_begin(&handle, event,
+ bpf_event->event_id.header.size);
+ if (ret)
+ return;
+
+ perf_output_put(&handle, bpf_event->event_id);
+ perf_event__output_id_sample(event, &handle, &sample);
+
+ perf_output_end(&handle);
+}
+
+static void perf_event_bpf_emit_ksymbols(struct bpf_prog *prog,
+ enum perf_bpf_event_type type)
+{
+ bool unregister = type == PERF_BPF_EVENT_PROG_UNLOAD;
+ char sym[KSYM_NAME_LEN];
+ int i;
+
+ if (prog->aux->func_cnt == 0) {
+ bpf_get_prog_name(prog, sym);
+ perf_event_ksymbol(PERF_RECORD_KSYMBOL_TYPE_BPF,
+ (u64)(unsigned long)prog->bpf_func,
+ prog->jited_len, unregister, sym);
+ } else {
+ for (i = 0; i < prog->aux->func_cnt; i++) {
+ struct bpf_prog *subprog = prog->aux->func[i];
+
+ bpf_get_prog_name(subprog, sym);
+ perf_event_ksymbol(
+ PERF_RECORD_KSYMBOL_TYPE_BPF,
+ (u64)(unsigned long)subprog->bpf_func,
+ subprog->jited_len, unregister, sym);
+ }
+ }
+}
+
+void perf_event_bpf_event(struct bpf_prog *prog,
+ enum perf_bpf_event_type type,
+ u16 flags)
+{
+ struct perf_bpf_event bpf_event;
+
+ if (type <= PERF_BPF_EVENT_UNKNOWN ||
+ type >= PERF_BPF_EVENT_MAX)
+ return;
+
+ switch (type) {
+ case PERF_BPF_EVENT_PROG_LOAD:
+ case PERF_BPF_EVENT_PROG_UNLOAD:
+ if (atomic_read(&nr_ksymbol_events))
+ perf_event_bpf_emit_ksymbols(prog, type);
+ break;
+ default:
+ break;
+ }
+
+ if (!atomic_read(&nr_bpf_events))
+ return;
+
+ bpf_event = (struct perf_bpf_event){
+ .prog = prog,
+ .event_id = {
+ .header = {
+ .type = PERF_RECORD_BPF_EVENT,
+ .size = sizeof(bpf_event.event_id),
+ },
+ .type = type,
+ .flags = flags,
+ .id = prog->aux->id,
+ },
+ };
+
+ BUILD_BUG_ON(BPF_TAG_SIZE % sizeof(u64));
+
+ memcpy(bpf_event.event_id.tag, prog->tag, BPF_TAG_SIZE);
+ perf_iterate_sb(perf_event_bpf_output, &bpf_event, NULL);
+}
+
void perf_event_itrace_started(struct perf_event *event)
{
event->attach_state |= PERF_ATTACH_ITRACE;
@@ -9996,6 +10109,8 @@ static void account_event(struct perf_event *event)
inc = true;
if (event->attr.ksymbol)
atomic_inc(&nr_ksymbol_events);
+ if (event->attr.bpf_event)
+ atomic_inc(&nr_bpf_events);
if (inc) {
/*
--
2.17.1
^ permalink raw reply related [flat|nested] 33+ messages in thread* [tip:perf/core] perf, bpf: Introduce PERF_RECORD_BPF_EVENT
2019-01-17 16:15 ` [PATCH v11 perf, bpf-next 3/9] perf, bpf: introduce PERF_RECORD_BPF_EVENT Song Liu
@ 2019-01-22 10:19 ` tip-bot for Song Liu
0 siblings, 0 replies; 33+ messages in thread
From: tip-bot for Song Liu @ 2019-01-22 10:19 UTC (permalink / raw)
To: linux-tip-commits
Cc: acme, tglx, mingo, songliubraving, peterz, daniel, peterz,
linux-kernel, hpa, ast
Commit-ID: 6ee52e2a3fe4ea35520720736e6791df1fb67106
Gitweb: https://git.kernel.org/tip/6ee52e2a3fe4ea35520720736e6791df1fb67106
Author: Song Liu <songliubraving@fb.com>
AuthorDate: Thu, 17 Jan 2019 08:15:15 -0800
Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Mon, 21 Jan 2019 17:00:57 -0300
perf, bpf: Introduce PERF_RECORD_BPF_EVENT
For better performance analysis of BPF programs, this patch introduces
PERF_RECORD_BPF_EVENT, a new perf_event_type that exposes BPF program
load/unload information to user space.
Each BPF program may contain up to BPF_MAX_SUBPROGS (256) sub programs.
The following example shows kernel symbols for a BPF program with 7 sub
programs:
ffffffffa0257cf9 t bpf_prog_b07ccb89267cf242_F
ffffffffa02592e1 t bpf_prog_2dcecc18072623fc_F
ffffffffa025b0e9 t bpf_prog_bb7a405ebaec5d5c_F
ffffffffa025dd2c t bpf_prog_a7540d4a39ec1fc7_F
ffffffffa025fcca t bpf_prog_05762d4ade0e3737_F
ffffffffa026108f t bpf_prog_db4bd11e35df90d4_F
ffffffffa0263f00 t bpf_prog_89d64e4abf0f0126_F
ffffffffa0257cf9 t bpf_prog_ae31629322c4b018__dummy_tracepoi
When a bpf program is loaded, PERF_RECORD_KSYMBOL is generated for each
of these sub programs. Therefore, PERF_RECORD_BPF_EVENT is not needed
for simple profiling.
For annotation, user space need to listen to PERF_RECORD_BPF_EVENT and
gather more information about these (sub) programs via sys_bpf.
Signed-off-by: Song Liu <songliubraving@fb.com>
Reviewed-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradeaed.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: kernel-team@fb.com
Cc: netdev@vger.kernel.org
Link: http://lkml.kernel.org/r/20190117161521.1341602-4-songliubraving@fb.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
include/linux/filter.h | 7 +++
include/linux/perf_event.h | 6 +++
include/uapi/linux/perf_event.h | 29 +++++++++-
kernel/bpf/core.c | 2 +-
kernel/bpf/syscall.c | 2 +
kernel/events/core.c | 115 ++++++++++++++++++++++++++++++++++++++++
6 files changed, 159 insertions(+), 2 deletions(-)
diff --git a/include/linux/filter.h b/include/linux/filter.h
index ad106d845b22..d531d4250bff 100644
--- a/include/linux/filter.h
+++ b/include/linux/filter.h
@@ -951,6 +951,7 @@ bpf_address_lookup(unsigned long addr, unsigned long *size,
void bpf_prog_kallsyms_add(struct bpf_prog *fp);
void bpf_prog_kallsyms_del(struct bpf_prog *fp);
+void bpf_get_prog_name(const struct bpf_prog *prog, char *sym);
#else /* CONFIG_BPF_JIT */
@@ -1006,6 +1007,12 @@ static inline void bpf_prog_kallsyms_add(struct bpf_prog *fp)
static inline void bpf_prog_kallsyms_del(struct bpf_prog *fp)
{
}
+
+static inline void bpf_get_prog_name(const struct bpf_prog *prog, char *sym)
+{
+ sym[0] = '\0';
+}
+
#endif /* CONFIG_BPF_JIT */
void bpf_prog_kallsyms_del_subprogs(struct bpf_prog *fp);
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 136fe0495374..a79e59fc3b7d 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -1125,6 +1125,9 @@ extern void perf_event_mmap(struct vm_area_struct *vma);
extern void perf_event_ksymbol(u16 ksym_type, u64 addr, u32 len,
bool unregister, const char *sym);
+extern void perf_event_bpf_event(struct bpf_prog *prog,
+ enum perf_bpf_event_type type,
+ u16 flags);
extern struct perf_guest_info_callbacks *perf_guest_cbs;
extern int perf_register_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks);
@@ -1350,6 +1353,9 @@ static inline void perf_event_mmap(struct vm_area_struct *vma) { }
typedef int (perf_ksymbol_get_name_f)(char *name, int name_len, void *data);
static inline void perf_event_ksymbol(u16 ksym_type, u64 addr, u32 len,
bool unregister, const char *sym) { }
+static inline void perf_event_bpf_event(struct bpf_prog *prog,
+ enum perf_bpf_event_type type,
+ u16 flags) { }
static inline void perf_event_exec(void) { }
static inline void perf_event_comm(struct task_struct *tsk, bool exec) { }
static inline void perf_event_namespaces(struct task_struct *tsk) { }
diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
index 1dee5c8f166b..7198ddd0c6b1 100644
--- a/include/uapi/linux/perf_event.h
+++ b/include/uapi/linux/perf_event.h
@@ -373,7 +373,8 @@ struct perf_event_attr {
write_backward : 1, /* Write ring buffer from end to beginning */
namespaces : 1, /* include namespaces data */
ksymbol : 1, /* include ksymbol events */
- __reserved_1 : 34;
+ bpf_event : 1, /* include bpf events */
+ __reserved_1 : 33;
union {
__u32 wakeup_events; /* wakeup every n events */
@@ -979,6 +980,25 @@ enum perf_event_type {
*/
PERF_RECORD_KSYMBOL = 17,
+ /*
+ * Record bpf events:
+ * enum perf_bpf_event_type {
+ * PERF_BPF_EVENT_UNKNOWN = 0,
+ * PERF_BPF_EVENT_PROG_LOAD = 1,
+ * PERF_BPF_EVENT_PROG_UNLOAD = 2,
+ * };
+ *
+ * struct {
+ * struct perf_event_header header;
+ * u16 type;
+ * u16 flags;
+ * u32 id;
+ * u8 tag[BPF_TAG_SIZE];
+ * struct sample_id sample_id;
+ * };
+ */
+ PERF_RECORD_BPF_EVENT = 18,
+
PERF_RECORD_MAX, /* non-ABI */
};
@@ -990,6 +1010,13 @@ enum perf_record_ksymbol_type {
#define PERF_RECORD_KSYMBOL_FLAGS_UNREGISTER (1 << 0)
+enum perf_bpf_event_type {
+ PERF_BPF_EVENT_UNKNOWN = 0,
+ PERF_BPF_EVENT_PROG_LOAD = 1,
+ PERF_BPF_EVENT_PROG_UNLOAD = 2,
+ PERF_BPF_EVENT_MAX, /* non-ABI */
+};
+
#define PERF_MAX_STACK_DEPTH 127
#define PERF_MAX_CONTEXTS_PER_STACK 8
diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c
index f908b9356025..19c49313c709 100644
--- a/kernel/bpf/core.c
+++ b/kernel/bpf/core.c
@@ -495,7 +495,7 @@ bpf_get_prog_addr_region(const struct bpf_prog *prog,
*symbol_end = addr + hdr->pages * PAGE_SIZE;
}
-static void bpf_get_prog_name(const struct bpf_prog *prog, char *sym)
+void bpf_get_prog_name(const struct bpf_prog *prog, char *sym)
{
const char *end = sym + KSYM_NAME_LEN;
const struct btf_type *type;
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index b155cd17c1bd..30ebd085790b 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -1211,6 +1211,7 @@ static void __bpf_prog_put_rcu(struct rcu_head *rcu)
static void __bpf_prog_put(struct bpf_prog *prog, bool do_idr_lock)
{
if (atomic_dec_and_test(&prog->aux->refcnt)) {
+ perf_event_bpf_event(prog, PERF_BPF_EVENT_PROG_UNLOAD, 0);
/* bpf_prog_free_id() must be called first */
bpf_prog_free_id(prog, do_idr_lock);
bpf_prog_kallsyms_del_all(prog);
@@ -1554,6 +1555,7 @@ static int bpf_prog_load(union bpf_attr *attr, union bpf_attr __user *uattr)
}
bpf_prog_kallsyms_add(prog);
+ perf_event_bpf_event(prog, PERF_BPF_EVENT_PROG_LOAD, 0);
return err;
free_used_maps:
diff --git a/kernel/events/core.c b/kernel/events/core.c
index e04ab5f325cf..236bb8ddb7bc 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -386,6 +386,7 @@ static atomic_t nr_task_events __read_mostly;
static atomic_t nr_freq_events __read_mostly;
static atomic_t nr_switch_events __read_mostly;
static atomic_t nr_ksymbol_events __read_mostly;
+static atomic_t nr_bpf_events __read_mostly;
static LIST_HEAD(pmus);
static DEFINE_MUTEX(pmus_lock);
@@ -4308,6 +4309,8 @@ static void unaccount_event(struct perf_event *event)
dec = true;
if (event->attr.ksymbol)
atomic_dec(&nr_ksymbol_events);
+ if (event->attr.bpf_event)
+ atomic_dec(&nr_bpf_events);
if (dec) {
if (!atomic_add_unless(&perf_sched_count, -1, 1))
@@ -7747,6 +7750,116 @@ err:
WARN_ONCE(1, "%s: Invalid KSYMBOL type 0x%x\n", __func__, ksym_type);
}
+/*
+ * bpf program load/unload tracking
+ */
+
+struct perf_bpf_event {
+ struct bpf_prog *prog;
+ struct {
+ struct perf_event_header header;
+ u16 type;
+ u16 flags;
+ u32 id;
+ u8 tag[BPF_TAG_SIZE];
+ } event_id;
+};
+
+static int perf_event_bpf_match(struct perf_event *event)
+{
+ return event->attr.bpf_event;
+}
+
+static void perf_event_bpf_output(struct perf_event *event, void *data)
+{
+ struct perf_bpf_event *bpf_event = data;
+ struct perf_output_handle handle;
+ struct perf_sample_data sample;
+ int ret;
+
+ if (!perf_event_bpf_match(event))
+ return;
+
+ perf_event_header__init_id(&bpf_event->event_id.header,
+ &sample, event);
+ ret = perf_output_begin(&handle, event,
+ bpf_event->event_id.header.size);
+ if (ret)
+ return;
+
+ perf_output_put(&handle, bpf_event->event_id);
+ perf_event__output_id_sample(event, &handle, &sample);
+
+ perf_output_end(&handle);
+}
+
+static void perf_event_bpf_emit_ksymbols(struct bpf_prog *prog,
+ enum perf_bpf_event_type type)
+{
+ bool unregister = type == PERF_BPF_EVENT_PROG_UNLOAD;
+ char sym[KSYM_NAME_LEN];
+ int i;
+
+ if (prog->aux->func_cnt == 0) {
+ bpf_get_prog_name(prog, sym);
+ perf_event_ksymbol(PERF_RECORD_KSYMBOL_TYPE_BPF,
+ (u64)(unsigned long)prog->bpf_func,
+ prog->jited_len, unregister, sym);
+ } else {
+ for (i = 0; i < prog->aux->func_cnt; i++) {
+ struct bpf_prog *subprog = prog->aux->func[i];
+
+ bpf_get_prog_name(subprog, sym);
+ perf_event_ksymbol(
+ PERF_RECORD_KSYMBOL_TYPE_BPF,
+ (u64)(unsigned long)subprog->bpf_func,
+ subprog->jited_len, unregister, sym);
+ }
+ }
+}
+
+void perf_event_bpf_event(struct bpf_prog *prog,
+ enum perf_bpf_event_type type,
+ u16 flags)
+{
+ struct perf_bpf_event bpf_event;
+
+ if (type <= PERF_BPF_EVENT_UNKNOWN ||
+ type >= PERF_BPF_EVENT_MAX)
+ return;
+
+ switch (type) {
+ case PERF_BPF_EVENT_PROG_LOAD:
+ case PERF_BPF_EVENT_PROG_UNLOAD:
+ if (atomic_read(&nr_ksymbol_events))
+ perf_event_bpf_emit_ksymbols(prog, type);
+ break;
+ default:
+ break;
+ }
+
+ if (!atomic_read(&nr_bpf_events))
+ return;
+
+ bpf_event = (struct perf_bpf_event){
+ .prog = prog,
+ .event_id = {
+ .header = {
+ .type = PERF_RECORD_BPF_EVENT,
+ .size = sizeof(bpf_event.event_id),
+ },
+ .type = type,
+ .flags = flags,
+ .id = prog->aux->id,
+ },
+ };
+
+ BUILD_BUG_ON(BPF_TAG_SIZE % sizeof(u64));
+
+ memcpy(bpf_event.event_id.tag, prog->tag, BPF_TAG_SIZE);
+ perf_iterate_sb(perf_event_bpf_output, &bpf_event, NULL);
+}
+
void perf_event_itrace_started(struct perf_event *event)
{
event->attach_state |= PERF_ATTACH_ITRACE;
@@ -10008,6 +10121,8 @@ static void account_event(struct perf_event *event)
inc = true;
if (event->attr.ksymbol)
atomic_inc(&nr_ksymbol_events);
+ if (event->attr.bpf_event)
+ atomic_inc(&nr_bpf_events);
if (inc) {
/*
^ permalink raw reply related [flat|nested] 33+ messages in thread
* [PATCH v11 perf, bpf-next 4/9] sync tools/include/uapi/linux/perf_event.h
2019-01-17 16:15 [PATCH v11 perf, bpf-next 0/9] reveal invisible bpf programs Song Liu
` (2 preceding siblings ...)
2019-01-17 16:15 ` [PATCH v11 perf, bpf-next 3/9] perf, bpf: introduce PERF_RECORD_BPF_EVENT Song Liu
@ 2019-01-17 16:15 ` Song Liu
2019-01-22 10:20 ` [tip:perf/core] tools headers uapi: Sync tools/include/uapi/linux/perf_event.h tip-bot for Song Liu
2019-01-17 16:15 ` [PATCH v11 perf, bpf-next 5/9] perf util: handle PERF_RECORD_KSYMBOL Song Liu
` (4 subsequent siblings)
8 siblings, 1 reply; 33+ messages in thread
From: Song Liu @ 2019-01-17 16:15 UTC (permalink / raw)
To: linux-kernel, netdev; +Cc: Song Liu, peterz, acme, ast, daniel, kernel-team
sync for PERF_RECORD_BPF_EVENT
Reviewed-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Song Liu <songliubraving@fb.com>
---
tools/include/uapi/linux/perf_event.h | 29 ++++++++++++++++++++++++++-
1 file changed, 28 insertions(+), 1 deletion(-)
diff --git a/tools/include/uapi/linux/perf_event.h b/tools/include/uapi/linux/perf_event.h
index 68c4da0227c5..8bd78a34e396 100644
--- a/tools/include/uapi/linux/perf_event.h
+++ b/tools/include/uapi/linux/perf_event.h
@@ -373,7 +373,8 @@ struct perf_event_attr {
write_backward : 1, /* Write ring buffer from end to beginning */
namespaces : 1, /* include namespaces data */
ksymbol : 1, /* include ksymbol events */
- __reserved_1 : 34;
+ bpf_event : 1, /* include bpf events */
+ __reserved_1 : 33;
union {
__u32 wakeup_events; /* wakeup every n events */
@@ -981,6 +982,25 @@ enum perf_event_type {
*/
PERF_RECORD_KSYMBOL = 17,
+ /*
+ * Record bpf events:
+ * enum perf_bpf_event_type {
+ * PERF_BPF_EVENT_UNKNOWN = 0,
+ * PERF_BPF_EVENT_PROG_LOAD = 1,
+ * PERF_BPF_EVENT_PROG_UNLOAD = 2,
+ * };
+ *
+ * struct {
+ * struct perf_event_header header;
+ * u16 type;
+ * u16 flags;
+ * u32 id;
+ * u8 tag[BPF_TAG_SIZE];
+ * struct sample_id sample_id;
+ * };
+ */
+ PERF_RECORD_BPF_EVENT = 18,
+
PERF_RECORD_MAX, /* non-ABI */
};
@@ -992,6 +1012,13 @@ enum perf_record_ksymbol_type {
#define PERF_RECORD_KSYMBOL_FLAGS_UNREGISTER (1 << 0)
+enum perf_bpf_event_type {
+ PERF_BPF_EVENT_UNKNOWN = 0,
+ PERF_BPF_EVENT_PROG_LOAD = 1,
+ PERF_BPF_EVENT_PROG_UNLOAD = 2,
+ PERF_BPF_EVENT_MAX, /* non-ABI */
+};
+
#define PERF_MAX_STACK_DEPTH 127
#define PERF_MAX_CONTEXTS_PER_STACK 8
--
2.17.1
^ permalink raw reply related [flat|nested] 33+ messages in thread* [tip:perf/core] tools headers uapi: Sync tools/include/uapi/linux/perf_event.h
2019-01-17 16:15 ` [PATCH v11 perf, bpf-next 4/9] sync tools/include/uapi/linux/perf_event.h Song Liu
@ 2019-01-22 10:20 ` tip-bot for Song Liu
0 siblings, 0 replies; 33+ messages in thread
From: tip-bot for Song Liu @ 2019-01-22 10:20 UTC (permalink / raw)
To: linux-tip-commits
Cc: linux-kernel, daniel, hpa, tglx, acme, mingo, songliubraving,
ast, peterz
Commit-ID: df063c83aa2c58412ddf533ada9aaf25986120ec
Gitweb: https://git.kernel.org/tip/df063c83aa2c58412ddf533ada9aaf25986120ec
Author: Song Liu <songliubraving@fb.com>
AuthorDate: Thu, 17 Jan 2019 08:15:16 -0800
Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Mon, 21 Jan 2019 17:00:57 -0300
tools headers uapi: Sync tools/include/uapi/linux/perf_event.h
Sync for PERF_RECORD_BPF_EVENT.
Signed-off-by: Song Liu <songliubraving@fb.com>
Reviewed-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: kernel-team@fb.com
Cc: netdev@vger.kernel.org
Link: http://lkml.kernel.org/r/20190117161521.1341602-5-songliubraving@fb.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/include/uapi/linux/perf_event.h | 29 ++++++++++++++++++++++++++++-
1 file changed, 28 insertions(+), 1 deletion(-)
diff --git a/tools/include/uapi/linux/perf_event.h b/tools/include/uapi/linux/perf_event.h
index 1dee5c8f166b..7198ddd0c6b1 100644
--- a/tools/include/uapi/linux/perf_event.h
+++ b/tools/include/uapi/linux/perf_event.h
@@ -373,7 +373,8 @@ struct perf_event_attr {
write_backward : 1, /* Write ring buffer from end to beginning */
namespaces : 1, /* include namespaces data */
ksymbol : 1, /* include ksymbol events */
- __reserved_1 : 34;
+ bpf_event : 1, /* include bpf events */
+ __reserved_1 : 33;
union {
__u32 wakeup_events; /* wakeup every n events */
@@ -979,6 +980,25 @@ enum perf_event_type {
*/
PERF_RECORD_KSYMBOL = 17,
+ /*
+ * Record bpf events:
+ * enum perf_bpf_event_type {
+ * PERF_BPF_EVENT_UNKNOWN = 0,
+ * PERF_BPF_EVENT_PROG_LOAD = 1,
+ * PERF_BPF_EVENT_PROG_UNLOAD = 2,
+ * };
+ *
+ * struct {
+ * struct perf_event_header header;
+ * u16 type;
+ * u16 flags;
+ * u32 id;
+ * u8 tag[BPF_TAG_SIZE];
+ * struct sample_id sample_id;
+ * };
+ */
+ PERF_RECORD_BPF_EVENT = 18,
+
PERF_RECORD_MAX, /* non-ABI */
};
@@ -990,6 +1010,13 @@ enum perf_record_ksymbol_type {
#define PERF_RECORD_KSYMBOL_FLAGS_UNREGISTER (1 << 0)
+enum perf_bpf_event_type {
+ PERF_BPF_EVENT_UNKNOWN = 0,
+ PERF_BPF_EVENT_PROG_LOAD = 1,
+ PERF_BPF_EVENT_PROG_UNLOAD = 2,
+ PERF_BPF_EVENT_MAX, /* non-ABI */
+};
+
#define PERF_MAX_STACK_DEPTH 127
#define PERF_MAX_CONTEXTS_PER_STACK 8
^ permalink raw reply related [flat|nested] 33+ messages in thread
* [PATCH v11 perf, bpf-next 5/9] perf util: handle PERF_RECORD_KSYMBOL
2019-01-17 16:15 [PATCH v11 perf, bpf-next 0/9] reveal invisible bpf programs Song Liu
` (3 preceding siblings ...)
2019-01-17 16:15 ` [PATCH v11 perf, bpf-next 4/9] sync tools/include/uapi/linux/perf_event.h Song Liu
@ 2019-01-17 16:15 ` Song Liu
2019-01-18 14:45 ` Arnaldo Carvalho de Melo
2019-01-22 10:20 ` [tip:perf/core] perf tools: Handle PERF_RECORD_KSYMBOL tip-bot for Song Liu
2019-01-17 16:15 ` [PATCH v11 perf, bpf-next 6/9] perf util: handle PERF_RECORD_BPF_EVENT Song Liu
` (3 subsequent siblings)
8 siblings, 2 replies; 33+ messages in thread
From: Song Liu @ 2019-01-17 16:15 UTC (permalink / raw)
To: linux-kernel, netdev; +Cc: Song Liu, peterz, acme, ast, daniel, kernel-team
This patch handles PERF_RECORD_KSYMBOL in perf record/report.
Specifically, map and symbol are created for ksymbol register, and
removed for ksymbol unregister.
This patch also set perf_event_attr.ksymbol properly. The flag is
ON by default.
Signed-off-by: Song Liu <songliubraving@fb.com>
---
tools/perf/util/event.c | 21 +++++++++++++++
tools/perf/util/event.h | 20 ++++++++++++++
tools/perf/util/evsel.c | 10 ++++++-
tools/perf/util/evsel.h | 1 +
tools/perf/util/machine.c | 55 +++++++++++++++++++++++++++++++++++++++
tools/perf/util/machine.h | 3 +++
tools/perf/util/session.c | 4 +++
tools/perf/util/tool.h | 4 ++-
8 files changed, 116 insertions(+), 2 deletions(-)
diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
index 937a5a4f71cc..3c8a6a8dd260 100644
--- a/tools/perf/util/event.c
+++ b/tools/perf/util/event.c
@@ -24,6 +24,7 @@
#include "symbol/kallsyms.h"
#include "asm/bug.h"
#include "stat.h"
+#include "session.h"
#define DEFAULT_PROC_MAP_PARSE_TIMEOUT 500
@@ -45,6 +46,7 @@ static const char *perf_event__names[] = {
[PERF_RECORD_SWITCH] = "SWITCH",
[PERF_RECORD_SWITCH_CPU_WIDE] = "SWITCH_CPU_WIDE",
[PERF_RECORD_NAMESPACES] = "NAMESPACES",
+ [PERF_RECORD_KSYMBOL] = "KSYMBOL",
[PERF_RECORD_HEADER_ATTR] = "ATTR",
[PERF_RECORD_HEADER_EVENT_TYPE] = "EVENT_TYPE",
[PERF_RECORD_HEADER_TRACING_DATA] = "TRACING_DATA",
@@ -1329,6 +1331,14 @@ int perf_event__process_switch(struct perf_tool *tool __maybe_unused,
return machine__process_switch_event(machine, event);
}
+int perf_event__process_ksymbol(struct perf_tool *tool __maybe_unused,
+ union perf_event *event,
+ struct perf_sample *sample __maybe_unused,
+ struct machine *machine)
+{
+ return machine__process_ksymbol(machine, event, sample);
+}
+
size_t perf_event__fprintf_mmap(union perf_event *event, FILE *fp)
{
return fprintf(fp, " %d/%d: [%#" PRIx64 "(%#" PRIx64 ") @ %#" PRIx64 "]: %c %s\n",
@@ -1461,6 +1471,14 @@ static size_t perf_event__fprintf_lost(union perf_event *event, FILE *fp)
return fprintf(fp, " lost %" PRIu64 "\n", event->lost.lost);
}
+size_t perf_event__fprintf_ksymbol(union perf_event *event, FILE *fp)
+{
+ return fprintf(fp, " ksymbol event with addr %lx len %u type %u flags 0x%x name %s\n",
+ event->ksymbol_event.addr, event->ksymbol_event.len,
+ event->ksymbol_event.ksym_type,
+ event->ksymbol_event.flags, event->ksymbol_event.name);
+}
+
size_t perf_event__fprintf(union perf_event *event, FILE *fp)
{
size_t ret = fprintf(fp, "PERF_RECORD_%s",
@@ -1496,6 +1514,9 @@ size_t perf_event__fprintf(union perf_event *event, FILE *fp)
case PERF_RECORD_LOST:
ret += perf_event__fprintf_lost(event, fp);
break;
+ case PERF_RECORD_KSYMBOL:
+ ret += perf_event__fprintf_ksymbol(event, fp);
+ break;
default:
ret += fprintf(fp, "\n");
}
diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
index eb95f3384958..018322f2a13e 100644
--- a/tools/perf/util/event.h
+++ b/tools/perf/util/event.h
@@ -5,6 +5,7 @@
#include <limits.h>
#include <stdio.h>
#include <linux/kernel.h>
+#include <linux/bpf.h>
#include "../perf.h"
#include "build-id.h"
@@ -84,6 +85,19 @@ struct throttle_event {
u64 stream_id;
};
+#ifndef KSYM_NAME_LEN
+#define KSYM_NAME_LEN 256
+#endif
+
+struct ksymbol_event {
+ struct perf_event_header header;
+ u64 addr;
+ u32 len;
+ u16 ksym_type;
+ u16 flags;
+ char name[KSYM_NAME_LEN];
+};
+
#define PERF_SAMPLE_MASK \
(PERF_SAMPLE_IP | PERF_SAMPLE_TID | \
PERF_SAMPLE_TIME | PERF_SAMPLE_ADDR | \
@@ -651,6 +665,7 @@ union perf_event {
struct stat_round_event stat_round;
struct time_conv_event time_conv;
struct feature_event feat;
+ struct ksymbol_event ksymbol_event;
};
void perf_event__print_totals(void);
@@ -748,6 +763,10 @@ int perf_event__process_exit(struct perf_tool *tool,
union perf_event *event,
struct perf_sample *sample,
struct machine *machine);
+int perf_event__process_ksymbol(struct perf_tool *tool,
+ union perf_event *event,
+ struct perf_sample *sample,
+ struct machine *machine);
int perf_tool__process_synth_event(struct perf_tool *tool,
union perf_event *event,
struct machine *machine,
@@ -811,6 +830,7 @@ size_t perf_event__fprintf_switch(union perf_event *event, FILE *fp);
size_t perf_event__fprintf_thread_map(union perf_event *event, FILE *fp);
size_t perf_event__fprintf_cpu_map(union perf_event *event, FILE *fp);
size_t perf_event__fprintf_namespaces(union perf_event *event, FILE *fp);
+size_t perf_event__fprintf_ksymbol(union perf_event *event, FILE *fp);
size_t perf_event__fprintf(union perf_event *event, FILE *fp);
int kallsyms__get_function_start(const char *kallsyms_filename,
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index dbc0466db368..9c8dc6d1aa7f 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -1035,6 +1035,7 @@ void perf_evsel__config(struct perf_evsel *evsel, struct record_opts *opts,
attr->mmap = track;
attr->mmap2 = track && !perf_missing_features.mmap2;
attr->comm = track;
+ attr->ksymbol = track && !perf_missing_features.ksymbol;
if (opts->record_namespaces)
attr->namespaces = track;
@@ -1652,6 +1653,7 @@ int perf_event_attr__fprintf(FILE *fp, struct perf_event_attr *attr,
PRINT_ATTRf(context_switch, p_unsigned);
PRINT_ATTRf(write_backward, p_unsigned);
PRINT_ATTRf(namespaces, p_unsigned);
+ PRINT_ATTRf(ksymbol, p_unsigned);
PRINT_ATTRn("{ wakeup_events, wakeup_watermark }", wakeup_events, p_unsigned);
PRINT_ATTRf(bp_type, p_unsigned);
@@ -1811,6 +1813,8 @@ int perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
PERF_SAMPLE_BRANCH_NO_CYCLES);
if (perf_missing_features.group_read && evsel->attr.inherit)
evsel->attr.read_format &= ~(PERF_FORMAT_GROUP|PERF_FORMAT_ID);
+ if (perf_missing_features.ksymbol)
+ evsel->attr.ksymbol = 0;
retry_sample_id:
if (perf_missing_features.sample_id_all)
evsel->attr.sample_id_all = 0;
@@ -1930,7 +1934,11 @@ int perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
* Must probe features in the order they were added to the
* perf_event_attr interface.
*/
- if (!perf_missing_features.write_backward && evsel->attr.write_backward) {
+ if (!perf_missing_features.ksymbol && evsel->attr.ksymbol) {
+ perf_missing_features.ksymbol = true;
+ pr_debug2("switching off ksymbol\n");
+ goto fallback_missing_features;
+ } else if (!perf_missing_features.write_backward && evsel->attr.write_backward) {
perf_missing_features.write_backward = true;
pr_debug2("switching off write_backward\n");
goto out_close;
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index 82a289ce8b0c..4a8c3e7f4808 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -168,6 +168,7 @@ struct perf_missing_features {
bool lbr_flags;
bool write_backward;
bool group_read;
+ bool ksymbol;
};
extern struct perf_missing_features perf_missing_features;
diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index 143f7057d581..9bca61c7d5bf 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -681,6 +681,59 @@ int machine__process_switch_event(struct machine *machine __maybe_unused,
return 0;
}
+static int machine__process_ksymbol_register(struct machine *machine,
+ union perf_event *event,
+ struct perf_sample *sample __maybe_unused)
+{
+ struct symbol *sym;
+ struct map *map;
+
+ map = map_groups__find(&machine->kmaps, event->ksymbol_event.addr);
+ if (!map) {
+ map = dso__new_map(event->ksymbol_event.name);
+ if (!map)
+ return -ENOMEM;
+
+ map->start = event->ksymbol_event.addr;
+ map->pgoff = map->start;
+ map->end = map->start + event->ksymbol_event.len;
+ map_groups__insert(&machine->kmaps, map);
+ }
+
+ sym = symbol__new(event->ksymbol_event.addr, event->ksymbol_event.len,
+ 0, 0, event->ksymbol_event.name);
+ if (!sym)
+ return -ENOMEM;
+ dso__insert_symbol(map->dso, sym);
+ return 0;
+}
+
+static int machine__process_ksymbol_unregister(struct machine *machine,
+ union perf_event *event,
+ struct perf_sample *sample __maybe_unused)
+{
+ struct map *map;
+
+ map = map_groups__find(&machine->kmaps, event->ksymbol_event.addr);
+ if (map)
+ map_groups__remove(&machine->kmaps, map);
+
+ return 0;
+}
+
+int machine__process_ksymbol(struct machine *machine __maybe_unused,
+ union perf_event *event,
+ struct perf_sample *sample)
+{
+ if (dump_trace)
+ perf_event__fprintf_ksymbol(event, stdout);
+
+ if (event->ksymbol_event.flags & PERF_RECORD_KSYMBOL_FLAGS_UNREGISTER)
+ return machine__process_ksymbol_unregister(machine, event,
+ sample);
+ return machine__process_ksymbol_register(machine, event, sample);
+}
+
static void dso__adjust_kmod_long_name(struct dso *dso, const char *filename)
{
const char *dup_filename;
@@ -1812,6 +1865,8 @@ int machine__process_event(struct machine *machine, union perf_event *event,
case PERF_RECORD_SWITCH:
case PERF_RECORD_SWITCH_CPU_WIDE:
ret = machine__process_switch_event(machine, event); break;
+ case PERF_RECORD_KSYMBOL:
+ ret = machine__process_ksymbol(machine, event, sample); break;
default:
ret = -1;
break;
diff --git a/tools/perf/util/machine.h b/tools/perf/util/machine.h
index a5d1da60f751..4ecd380ce1b4 100644
--- a/tools/perf/util/machine.h
+++ b/tools/perf/util/machine.h
@@ -130,6 +130,9 @@ int machine__process_mmap_event(struct machine *machine, union perf_event *event
struct perf_sample *sample);
int machine__process_mmap2_event(struct machine *machine, union perf_event *event,
struct perf_sample *sample);
+int machine__process_ksymbol(struct machine *machine,
+ union perf_event *event,
+ struct perf_sample *sample);
int machine__process_event(struct machine *machine, union perf_event *event,
struct perf_sample *sample);
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 5456c84c7dd1..2efa75bb0c0a 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -376,6 +376,8 @@ void perf_tool__fill_defaults(struct perf_tool *tool)
tool->itrace_start = perf_event__process_itrace_start;
if (tool->context_switch == NULL)
tool->context_switch = perf_event__process_switch;
+ if (tool->ksymbol == NULL)
+ tool->ksymbol = perf_event__process_ksymbol;
if (tool->read == NULL)
tool->read = process_event_sample_stub;
if (tool->throttle == NULL)
@@ -1305,6 +1307,8 @@ static int machines__deliver_event(struct machines *machines,
case PERF_RECORD_SWITCH:
case PERF_RECORD_SWITCH_CPU_WIDE:
return tool->context_switch(tool, event, sample, machine);
+ case PERF_RECORD_KSYMBOL:
+ return tool->ksymbol(tool, event, sample, machine);
default:
++evlist->stats.nr_unknown_events;
return -1;
diff --git a/tools/perf/util/tool.h b/tools/perf/util/tool.h
index 56e4ca54020a..9c81ca2f3cf7 100644
--- a/tools/perf/util/tool.h
+++ b/tools/perf/util/tool.h
@@ -53,7 +53,9 @@ struct perf_tool {
itrace_start,
context_switch,
throttle,
- unthrottle;
+ unthrottle,
+ ksymbol;
+
event_attr_op attr;
event_attr_op event_update;
event_op2 tracing_data;
--
2.17.1
^ permalink raw reply related [flat|nested] 33+ messages in thread* Re: [PATCH v11 perf, bpf-next 5/9] perf util: handle PERF_RECORD_KSYMBOL
2019-01-17 16:15 ` [PATCH v11 perf, bpf-next 5/9] perf util: handle PERF_RECORD_KSYMBOL Song Liu
@ 2019-01-18 14:45 ` Arnaldo Carvalho de Melo
2019-01-22 10:20 ` [tip:perf/core] perf tools: Handle PERF_RECORD_KSYMBOL tip-bot for Song Liu
1 sibling, 0 replies; 33+ messages in thread
From: Arnaldo Carvalho de Melo @ 2019-01-18 14:45 UTC (permalink / raw)
To: Song Liu; +Cc: linux-kernel, netdev, peterz, ast, daniel, kernel-team
Em Thu, Jan 17, 2019 at 08:15:17AM -0800, Song Liu escreveu:
> This patch handles PERF_RECORD_KSYMBOL in perf record/report.
> Specifically, map and symbol are created for ksymbol register, and
> removed for ksymbol unregister.
>
> This patch also set perf_event_attr.ksymbol properly. The flag is
> ON by default.
Thanks for addressing my comments, I'll stick a Reviewed-by when
applying this patch.
- Arnaldo
> Signed-off-by: Song Liu <songliubraving@fb.com>
> ---
> tools/perf/util/event.c | 21 +++++++++++++++
> tools/perf/util/event.h | 20 ++++++++++++++
> tools/perf/util/evsel.c | 10 ++++++-
> tools/perf/util/evsel.h | 1 +
> tools/perf/util/machine.c | 55 +++++++++++++++++++++++++++++++++++++++
> tools/perf/util/machine.h | 3 +++
> tools/perf/util/session.c | 4 +++
> tools/perf/util/tool.h | 4 ++-
> 8 files changed, 116 insertions(+), 2 deletions(-)
>
> diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
> index 937a5a4f71cc..3c8a6a8dd260 100644
> --- a/tools/perf/util/event.c
> +++ b/tools/perf/util/event.c
> @@ -24,6 +24,7 @@
> #include "symbol/kallsyms.h"
> #include "asm/bug.h"
> #include "stat.h"
> +#include "session.h"
>
> #define DEFAULT_PROC_MAP_PARSE_TIMEOUT 500
>
> @@ -45,6 +46,7 @@ static const char *perf_event__names[] = {
> [PERF_RECORD_SWITCH] = "SWITCH",
> [PERF_RECORD_SWITCH_CPU_WIDE] = "SWITCH_CPU_WIDE",
> [PERF_RECORD_NAMESPACES] = "NAMESPACES",
> + [PERF_RECORD_KSYMBOL] = "KSYMBOL",
> [PERF_RECORD_HEADER_ATTR] = "ATTR",
> [PERF_RECORD_HEADER_EVENT_TYPE] = "EVENT_TYPE",
> [PERF_RECORD_HEADER_TRACING_DATA] = "TRACING_DATA",
> @@ -1329,6 +1331,14 @@ int perf_event__process_switch(struct perf_tool *tool __maybe_unused,
> return machine__process_switch_event(machine, event);
> }
>
> +int perf_event__process_ksymbol(struct perf_tool *tool __maybe_unused,
> + union perf_event *event,
> + struct perf_sample *sample __maybe_unused,
> + struct machine *machine)
> +{
> + return machine__process_ksymbol(machine, event, sample);
> +}
> +
> size_t perf_event__fprintf_mmap(union perf_event *event, FILE *fp)
> {
> return fprintf(fp, " %d/%d: [%#" PRIx64 "(%#" PRIx64 ") @ %#" PRIx64 "]: %c %s\n",
> @@ -1461,6 +1471,14 @@ static size_t perf_event__fprintf_lost(union perf_event *event, FILE *fp)
> return fprintf(fp, " lost %" PRIu64 "\n", event->lost.lost);
> }
>
> +size_t perf_event__fprintf_ksymbol(union perf_event *event, FILE *fp)
> +{
> + return fprintf(fp, " ksymbol event with addr %lx len %u type %u flags 0x%x name %s\n",
> + event->ksymbol_event.addr, event->ksymbol_event.len,
> + event->ksymbol_event.ksym_type,
> + event->ksymbol_event.flags, event->ksymbol_event.name);
> +}
> +
> size_t perf_event__fprintf(union perf_event *event, FILE *fp)
> {
> size_t ret = fprintf(fp, "PERF_RECORD_%s",
> @@ -1496,6 +1514,9 @@ size_t perf_event__fprintf(union perf_event *event, FILE *fp)
> case PERF_RECORD_LOST:
> ret += perf_event__fprintf_lost(event, fp);
> break;
> + case PERF_RECORD_KSYMBOL:
> + ret += perf_event__fprintf_ksymbol(event, fp);
> + break;
> default:
> ret += fprintf(fp, "\n");
> }
> diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
> index eb95f3384958..018322f2a13e 100644
> --- a/tools/perf/util/event.h
> +++ b/tools/perf/util/event.h
> @@ -5,6 +5,7 @@
> #include <limits.h>
> #include <stdio.h>
> #include <linux/kernel.h>
> +#include <linux/bpf.h>
>
> #include "../perf.h"
> #include "build-id.h"
> @@ -84,6 +85,19 @@ struct throttle_event {
> u64 stream_id;
> };
>
> +#ifndef KSYM_NAME_LEN
> +#define KSYM_NAME_LEN 256
> +#endif
> +
> +struct ksymbol_event {
> + struct perf_event_header header;
> + u64 addr;
> + u32 len;
> + u16 ksym_type;
> + u16 flags;
> + char name[KSYM_NAME_LEN];
> +};
> +
> #define PERF_SAMPLE_MASK \
> (PERF_SAMPLE_IP | PERF_SAMPLE_TID | \
> PERF_SAMPLE_TIME | PERF_SAMPLE_ADDR | \
> @@ -651,6 +665,7 @@ union perf_event {
> struct stat_round_event stat_round;
> struct time_conv_event time_conv;
> struct feature_event feat;
> + struct ksymbol_event ksymbol_event;
> };
>
> void perf_event__print_totals(void);
> @@ -748,6 +763,10 @@ int perf_event__process_exit(struct perf_tool *tool,
> union perf_event *event,
> struct perf_sample *sample,
> struct machine *machine);
> +int perf_event__process_ksymbol(struct perf_tool *tool,
> + union perf_event *event,
> + struct perf_sample *sample,
> + struct machine *machine);
> int perf_tool__process_synth_event(struct perf_tool *tool,
> union perf_event *event,
> struct machine *machine,
> @@ -811,6 +830,7 @@ size_t perf_event__fprintf_switch(union perf_event *event, FILE *fp);
> size_t perf_event__fprintf_thread_map(union perf_event *event, FILE *fp);
> size_t perf_event__fprintf_cpu_map(union perf_event *event, FILE *fp);
> size_t perf_event__fprintf_namespaces(union perf_event *event, FILE *fp);
> +size_t perf_event__fprintf_ksymbol(union perf_event *event, FILE *fp);
> size_t perf_event__fprintf(union perf_event *event, FILE *fp);
>
> int kallsyms__get_function_start(const char *kallsyms_filename,
> diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
> index dbc0466db368..9c8dc6d1aa7f 100644
> --- a/tools/perf/util/evsel.c
> +++ b/tools/perf/util/evsel.c
> @@ -1035,6 +1035,7 @@ void perf_evsel__config(struct perf_evsel *evsel, struct record_opts *opts,
> attr->mmap = track;
> attr->mmap2 = track && !perf_missing_features.mmap2;
> attr->comm = track;
> + attr->ksymbol = track && !perf_missing_features.ksymbol;
>
> if (opts->record_namespaces)
> attr->namespaces = track;
> @@ -1652,6 +1653,7 @@ int perf_event_attr__fprintf(FILE *fp, struct perf_event_attr *attr,
> PRINT_ATTRf(context_switch, p_unsigned);
> PRINT_ATTRf(write_backward, p_unsigned);
> PRINT_ATTRf(namespaces, p_unsigned);
> + PRINT_ATTRf(ksymbol, p_unsigned);
>
> PRINT_ATTRn("{ wakeup_events, wakeup_watermark }", wakeup_events, p_unsigned);
> PRINT_ATTRf(bp_type, p_unsigned);
> @@ -1811,6 +1813,8 @@ int perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
> PERF_SAMPLE_BRANCH_NO_CYCLES);
> if (perf_missing_features.group_read && evsel->attr.inherit)
> evsel->attr.read_format &= ~(PERF_FORMAT_GROUP|PERF_FORMAT_ID);
> + if (perf_missing_features.ksymbol)
> + evsel->attr.ksymbol = 0;
> retry_sample_id:
> if (perf_missing_features.sample_id_all)
> evsel->attr.sample_id_all = 0;
> @@ -1930,7 +1934,11 @@ int perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
> * Must probe features in the order they were added to the
> * perf_event_attr interface.
> */
> - if (!perf_missing_features.write_backward && evsel->attr.write_backward) {
> + if (!perf_missing_features.ksymbol && evsel->attr.ksymbol) {
> + perf_missing_features.ksymbol = true;
> + pr_debug2("switching off ksymbol\n");
> + goto fallback_missing_features;
> + } else if (!perf_missing_features.write_backward && evsel->attr.write_backward) {
> perf_missing_features.write_backward = true;
> pr_debug2("switching off write_backward\n");
> goto out_close;
> diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
> index 82a289ce8b0c..4a8c3e7f4808 100644
> --- a/tools/perf/util/evsel.h
> +++ b/tools/perf/util/evsel.h
> @@ -168,6 +168,7 @@ struct perf_missing_features {
> bool lbr_flags;
> bool write_backward;
> bool group_read;
> + bool ksymbol;
> };
>
> extern struct perf_missing_features perf_missing_features;
> diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
> index 143f7057d581..9bca61c7d5bf 100644
> --- a/tools/perf/util/machine.c
> +++ b/tools/perf/util/machine.c
> @@ -681,6 +681,59 @@ int machine__process_switch_event(struct machine *machine __maybe_unused,
> return 0;
> }
>
> +static int machine__process_ksymbol_register(struct machine *machine,
> + union perf_event *event,
> + struct perf_sample *sample __maybe_unused)
> +{
> + struct symbol *sym;
> + struct map *map;
> +
> + map = map_groups__find(&machine->kmaps, event->ksymbol_event.addr);
> + if (!map) {
> + map = dso__new_map(event->ksymbol_event.name);
> + if (!map)
> + return -ENOMEM;
> +
> + map->start = event->ksymbol_event.addr;
> + map->pgoff = map->start;
> + map->end = map->start + event->ksymbol_event.len;
> + map_groups__insert(&machine->kmaps, map);
> + }
> +
> + sym = symbol__new(event->ksymbol_event.addr, event->ksymbol_event.len,
> + 0, 0, event->ksymbol_event.name);
> + if (!sym)
> + return -ENOMEM;
> + dso__insert_symbol(map->dso, sym);
> + return 0;
> +}
> +
> +static int machine__process_ksymbol_unregister(struct machine *machine,
> + union perf_event *event,
> + struct perf_sample *sample __maybe_unused)
> +{
> + struct map *map;
> +
> + map = map_groups__find(&machine->kmaps, event->ksymbol_event.addr);
> + if (map)
> + map_groups__remove(&machine->kmaps, map);
> +
> + return 0;
> +}
> +
> +int machine__process_ksymbol(struct machine *machine __maybe_unused,
> + union perf_event *event,
> + struct perf_sample *sample)
> +{
> + if (dump_trace)
> + perf_event__fprintf_ksymbol(event, stdout);
> +
> + if (event->ksymbol_event.flags & PERF_RECORD_KSYMBOL_FLAGS_UNREGISTER)
> + return machine__process_ksymbol_unregister(machine, event,
> + sample);
> + return machine__process_ksymbol_register(machine, event, sample);
> +}
> +
> static void dso__adjust_kmod_long_name(struct dso *dso, const char *filename)
> {
> const char *dup_filename;
> @@ -1812,6 +1865,8 @@ int machine__process_event(struct machine *machine, union perf_event *event,
> case PERF_RECORD_SWITCH:
> case PERF_RECORD_SWITCH_CPU_WIDE:
> ret = machine__process_switch_event(machine, event); break;
> + case PERF_RECORD_KSYMBOL:
> + ret = machine__process_ksymbol(machine, event, sample); break;
> default:
> ret = -1;
> break;
> diff --git a/tools/perf/util/machine.h b/tools/perf/util/machine.h
> index a5d1da60f751..4ecd380ce1b4 100644
> --- a/tools/perf/util/machine.h
> +++ b/tools/perf/util/machine.h
> @@ -130,6 +130,9 @@ int machine__process_mmap_event(struct machine *machine, union perf_event *event
> struct perf_sample *sample);
> int machine__process_mmap2_event(struct machine *machine, union perf_event *event,
> struct perf_sample *sample);
> +int machine__process_ksymbol(struct machine *machine,
> + union perf_event *event,
> + struct perf_sample *sample);
> int machine__process_event(struct machine *machine, union perf_event *event,
> struct perf_sample *sample);
>
> diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
> index 5456c84c7dd1..2efa75bb0c0a 100644
> --- a/tools/perf/util/session.c
> +++ b/tools/perf/util/session.c
> @@ -376,6 +376,8 @@ void perf_tool__fill_defaults(struct perf_tool *tool)
> tool->itrace_start = perf_event__process_itrace_start;
> if (tool->context_switch == NULL)
> tool->context_switch = perf_event__process_switch;
> + if (tool->ksymbol == NULL)
> + tool->ksymbol = perf_event__process_ksymbol;
> if (tool->read == NULL)
> tool->read = process_event_sample_stub;
> if (tool->throttle == NULL)
> @@ -1305,6 +1307,8 @@ static int machines__deliver_event(struct machines *machines,
> case PERF_RECORD_SWITCH:
> case PERF_RECORD_SWITCH_CPU_WIDE:
> return tool->context_switch(tool, event, sample, machine);
> + case PERF_RECORD_KSYMBOL:
> + return tool->ksymbol(tool, event, sample, machine);
> default:
> ++evlist->stats.nr_unknown_events;
> return -1;
> diff --git a/tools/perf/util/tool.h b/tools/perf/util/tool.h
> index 56e4ca54020a..9c81ca2f3cf7 100644
> --- a/tools/perf/util/tool.h
> +++ b/tools/perf/util/tool.h
> @@ -53,7 +53,9 @@ struct perf_tool {
> itrace_start,
> context_switch,
> throttle,
> - unthrottle;
> + unthrottle,
> + ksymbol;
> +
> event_attr_op attr;
> event_attr_op event_update;
> event_op2 tracing_data;
> --
> 2.17.1
--
- Arnaldo
^ permalink raw reply [flat|nested] 33+ messages in thread* [tip:perf/core] perf tools: Handle PERF_RECORD_KSYMBOL
2019-01-17 16:15 ` [PATCH v11 perf, bpf-next 5/9] perf util: handle PERF_RECORD_KSYMBOL Song Liu
2019-01-18 14:45 ` Arnaldo Carvalho de Melo
@ 2019-01-22 10:20 ` tip-bot for Song Liu
1 sibling, 0 replies; 33+ messages in thread
From: tip-bot for Song Liu @ 2019-01-22 10:20 UTC (permalink / raw)
To: linux-tip-commits
Cc: mingo, tglx, ast, linux-kernel, hpa, songliubraving, peterz,
acme, daniel
Commit-ID: 9aa0bfa370b278a539077002b3c660468d66b5e7
Gitweb: https://git.kernel.org/tip/9aa0bfa370b278a539077002b3c660468d66b5e7
Author: Song Liu <songliubraving@fb.com>
AuthorDate: Thu, 17 Jan 2019 08:15:17 -0800
Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Mon, 21 Jan 2019 17:00:57 -0300
perf tools: Handle PERF_RECORD_KSYMBOL
This patch handles PERF_RECORD_KSYMBOL in perf record/report.
Specifically, map and symbol are created for ksymbol register, and
removed for ksymbol unregister.
This patch also sets perf_event_attr.ksymbol properly. The flag is ON by
default.
Committer notes:
Use proper inttypes.h for u64, fixing the build in some environments
like in the android NDK r15c targetting ARM 32-bit.
I.e. fixing this build error:
util/event.c: In function 'perf_event__fprintf_ksymbol':
util/event.c:1489:10: error: format '%lx' expects argument of type 'long unsigned int', but argument 3 has type 'u64' [-Werror=format=]
event->ksymbol_event.flags, event->ksymbol_event.name);
^
cc1: all warnings being treated as errors
Signed-off-by: Song Liu <songliubraving@fb.com>
Reviewed-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: kernel-team@fb.com
Cc: netdev@vger.kernel.org
Link: http://lkml.kernel.org/r/20190117161521.1341602-6-songliubraving@fb.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/util/event.c | 21 ++++++++++++++++++
tools/perf/util/event.h | 20 +++++++++++++++++
tools/perf/util/evsel.c | 10 ++++++++-
tools/perf/util/evsel.h | 1 +
tools/perf/util/machine.c | 55 +++++++++++++++++++++++++++++++++++++++++++++++
tools/perf/util/machine.h | 3 +++
tools/perf/util/session.c | 4 ++++
tools/perf/util/tool.h | 4 +++-
8 files changed, 116 insertions(+), 2 deletions(-)
diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
index 937a5a4f71cc..f06f3811b25b 100644
--- a/tools/perf/util/event.c
+++ b/tools/perf/util/event.c
@@ -24,6 +24,7 @@
#include "symbol/kallsyms.h"
#include "asm/bug.h"
#include "stat.h"
+#include "session.h"
#define DEFAULT_PROC_MAP_PARSE_TIMEOUT 500
@@ -45,6 +46,7 @@ static const char *perf_event__names[] = {
[PERF_RECORD_SWITCH] = "SWITCH",
[PERF_RECORD_SWITCH_CPU_WIDE] = "SWITCH_CPU_WIDE",
[PERF_RECORD_NAMESPACES] = "NAMESPACES",
+ [PERF_RECORD_KSYMBOL] = "KSYMBOL",
[PERF_RECORD_HEADER_ATTR] = "ATTR",
[PERF_RECORD_HEADER_EVENT_TYPE] = "EVENT_TYPE",
[PERF_RECORD_HEADER_TRACING_DATA] = "TRACING_DATA",
@@ -1329,6 +1331,14 @@ int perf_event__process_switch(struct perf_tool *tool __maybe_unused,
return machine__process_switch_event(machine, event);
}
+int perf_event__process_ksymbol(struct perf_tool *tool __maybe_unused,
+ union perf_event *event,
+ struct perf_sample *sample __maybe_unused,
+ struct machine *machine)
+{
+ return machine__process_ksymbol(machine, event, sample);
+}
+
size_t perf_event__fprintf_mmap(union perf_event *event, FILE *fp)
{
return fprintf(fp, " %d/%d: [%#" PRIx64 "(%#" PRIx64 ") @ %#" PRIx64 "]: %c %s\n",
@@ -1461,6 +1471,14 @@ static size_t perf_event__fprintf_lost(union perf_event *event, FILE *fp)
return fprintf(fp, " lost %" PRIu64 "\n", event->lost.lost);
}
+size_t perf_event__fprintf_ksymbol(union perf_event *event, FILE *fp)
+{
+ return fprintf(fp, " ksymbol event with addr %" PRIx64 " len %u type %u flags 0x%x name %s\n",
+ event->ksymbol_event.addr, event->ksymbol_event.len,
+ event->ksymbol_event.ksym_type,
+ event->ksymbol_event.flags, event->ksymbol_event.name);
+}
+
size_t perf_event__fprintf(union perf_event *event, FILE *fp)
{
size_t ret = fprintf(fp, "PERF_RECORD_%s",
@@ -1496,6 +1514,9 @@ size_t perf_event__fprintf(union perf_event *event, FILE *fp)
case PERF_RECORD_LOST:
ret += perf_event__fprintf_lost(event, fp);
break;
+ case PERF_RECORD_KSYMBOL:
+ ret += perf_event__fprintf_ksymbol(event, fp);
+ break;
default:
ret += fprintf(fp, "\n");
}
diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
index eb95f3384958..018322f2a13e 100644
--- a/tools/perf/util/event.h
+++ b/tools/perf/util/event.h
@@ -5,6 +5,7 @@
#include <limits.h>
#include <stdio.h>
#include <linux/kernel.h>
+#include <linux/bpf.h>
#include "../perf.h"
#include "build-id.h"
@@ -84,6 +85,19 @@ struct throttle_event {
u64 stream_id;
};
+#ifndef KSYM_NAME_LEN
+#define KSYM_NAME_LEN 256
+#endif
+
+struct ksymbol_event {
+ struct perf_event_header header;
+ u64 addr;
+ u32 len;
+ u16 ksym_type;
+ u16 flags;
+ char name[KSYM_NAME_LEN];
+};
+
#define PERF_SAMPLE_MASK \
(PERF_SAMPLE_IP | PERF_SAMPLE_TID | \
PERF_SAMPLE_TIME | PERF_SAMPLE_ADDR | \
@@ -651,6 +665,7 @@ union perf_event {
struct stat_round_event stat_round;
struct time_conv_event time_conv;
struct feature_event feat;
+ struct ksymbol_event ksymbol_event;
};
void perf_event__print_totals(void);
@@ -748,6 +763,10 @@ int perf_event__process_exit(struct perf_tool *tool,
union perf_event *event,
struct perf_sample *sample,
struct machine *machine);
+int perf_event__process_ksymbol(struct perf_tool *tool,
+ union perf_event *event,
+ struct perf_sample *sample,
+ struct machine *machine);
int perf_tool__process_synth_event(struct perf_tool *tool,
union perf_event *event,
struct machine *machine,
@@ -811,6 +830,7 @@ size_t perf_event__fprintf_switch(union perf_event *event, FILE *fp);
size_t perf_event__fprintf_thread_map(union perf_event *event, FILE *fp);
size_t perf_event__fprintf_cpu_map(union perf_event *event, FILE *fp);
size_t perf_event__fprintf_namespaces(union perf_event *event, FILE *fp);
+size_t perf_event__fprintf_ksymbol(union perf_event *event, FILE *fp);
size_t perf_event__fprintf(union perf_event *event, FILE *fp);
int kallsyms__get_function_start(const char *kallsyms_filename,
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index dbc0466db368..9c8dc6d1aa7f 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -1035,6 +1035,7 @@ void perf_evsel__config(struct perf_evsel *evsel, struct record_opts *opts,
attr->mmap = track;
attr->mmap2 = track && !perf_missing_features.mmap2;
attr->comm = track;
+ attr->ksymbol = track && !perf_missing_features.ksymbol;
if (opts->record_namespaces)
attr->namespaces = track;
@@ -1652,6 +1653,7 @@ int perf_event_attr__fprintf(FILE *fp, struct perf_event_attr *attr,
PRINT_ATTRf(context_switch, p_unsigned);
PRINT_ATTRf(write_backward, p_unsigned);
PRINT_ATTRf(namespaces, p_unsigned);
+ PRINT_ATTRf(ksymbol, p_unsigned);
PRINT_ATTRn("{ wakeup_events, wakeup_watermark }", wakeup_events, p_unsigned);
PRINT_ATTRf(bp_type, p_unsigned);
@@ -1811,6 +1813,8 @@ fallback_missing_features:
PERF_SAMPLE_BRANCH_NO_CYCLES);
if (perf_missing_features.group_read && evsel->attr.inherit)
evsel->attr.read_format &= ~(PERF_FORMAT_GROUP|PERF_FORMAT_ID);
+ if (perf_missing_features.ksymbol)
+ evsel->attr.ksymbol = 0;
retry_sample_id:
if (perf_missing_features.sample_id_all)
evsel->attr.sample_id_all = 0;
@@ -1930,7 +1934,11 @@ try_fallback:
* Must probe features in the order they were added to the
* perf_event_attr interface.
*/
- if (!perf_missing_features.write_backward && evsel->attr.write_backward) {
+ if (!perf_missing_features.ksymbol && evsel->attr.ksymbol) {
+ perf_missing_features.ksymbol = true;
+ pr_debug2("switching off ksymbol\n");
+ goto fallback_missing_features;
+ } else if (!perf_missing_features.write_backward && evsel->attr.write_backward) {
perf_missing_features.write_backward = true;
pr_debug2("switching off write_backward\n");
goto out_close;
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index 82a289ce8b0c..4a8c3e7f4808 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -168,6 +168,7 @@ struct perf_missing_features {
bool lbr_flags;
bool write_backward;
bool group_read;
+ bool ksymbol;
};
extern struct perf_missing_features perf_missing_features;
diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index 143f7057d581..9bca61c7d5bf 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -681,6 +681,59 @@ int machine__process_switch_event(struct machine *machine __maybe_unused,
return 0;
}
+static int machine__process_ksymbol_register(struct machine *machine,
+ union perf_event *event,
+ struct perf_sample *sample __maybe_unused)
+{
+ struct symbol *sym;
+ struct map *map;
+
+ map = map_groups__find(&machine->kmaps, event->ksymbol_event.addr);
+ if (!map) {
+ map = dso__new_map(event->ksymbol_event.name);
+ if (!map)
+ return -ENOMEM;
+
+ map->start = event->ksymbol_event.addr;
+ map->pgoff = map->start;
+ map->end = map->start + event->ksymbol_event.len;
+ map_groups__insert(&machine->kmaps, map);
+ }
+
+ sym = symbol__new(event->ksymbol_event.addr, event->ksymbol_event.len,
+ 0, 0, event->ksymbol_event.name);
+ if (!sym)
+ return -ENOMEM;
+ dso__insert_symbol(map->dso, sym);
+ return 0;
+}
+
+static int machine__process_ksymbol_unregister(struct machine *machine,
+ union perf_event *event,
+ struct perf_sample *sample __maybe_unused)
+{
+ struct map *map;
+
+ map = map_groups__find(&machine->kmaps, event->ksymbol_event.addr);
+ if (map)
+ map_groups__remove(&machine->kmaps, map);
+
+ return 0;
+}
+
+int machine__process_ksymbol(struct machine *machine __maybe_unused,
+ union perf_event *event,
+ struct perf_sample *sample)
+{
+ if (dump_trace)
+ perf_event__fprintf_ksymbol(event, stdout);
+
+ if (event->ksymbol_event.flags & PERF_RECORD_KSYMBOL_FLAGS_UNREGISTER)
+ return machine__process_ksymbol_unregister(machine, event,
+ sample);
+ return machine__process_ksymbol_register(machine, event, sample);
+}
+
static void dso__adjust_kmod_long_name(struct dso *dso, const char *filename)
{
const char *dup_filename;
@@ -1812,6 +1865,8 @@ int machine__process_event(struct machine *machine, union perf_event *event,
case PERF_RECORD_SWITCH:
case PERF_RECORD_SWITCH_CPU_WIDE:
ret = machine__process_switch_event(machine, event); break;
+ case PERF_RECORD_KSYMBOL:
+ ret = machine__process_ksymbol(machine, event, sample); break;
default:
ret = -1;
break;
diff --git a/tools/perf/util/machine.h b/tools/perf/util/machine.h
index a5d1da60f751..4ecd380ce1b4 100644
--- a/tools/perf/util/machine.h
+++ b/tools/perf/util/machine.h
@@ -130,6 +130,9 @@ int machine__process_mmap_event(struct machine *machine, union perf_event *event
struct perf_sample *sample);
int machine__process_mmap2_event(struct machine *machine, union perf_event *event,
struct perf_sample *sample);
+int machine__process_ksymbol(struct machine *machine,
+ union perf_event *event,
+ struct perf_sample *sample);
int machine__process_event(struct machine *machine, union perf_event *event,
struct perf_sample *sample);
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index b26bc9c54200..dcfacfb036a3 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -379,6 +379,8 @@ void perf_tool__fill_defaults(struct perf_tool *tool)
tool->itrace_start = perf_event__process_itrace_start;
if (tool->context_switch == NULL)
tool->context_switch = perf_event__process_switch;
+ if (tool->ksymbol == NULL)
+ tool->ksymbol = perf_event__process_ksymbol;
if (tool->read == NULL)
tool->read = process_event_sample_stub;
if (tool->throttle == NULL)
@@ -1310,6 +1312,8 @@ static int machines__deliver_event(struct machines *machines,
case PERF_RECORD_SWITCH:
case PERF_RECORD_SWITCH_CPU_WIDE:
return tool->context_switch(tool, event, sample, machine);
+ case PERF_RECORD_KSYMBOL:
+ return tool->ksymbol(tool, event, sample, machine);
default:
++evlist->stats.nr_unknown_events;
return -1;
diff --git a/tools/perf/util/tool.h b/tools/perf/util/tool.h
index 56e4ca54020a..9c81ca2f3cf7 100644
--- a/tools/perf/util/tool.h
+++ b/tools/perf/util/tool.h
@@ -53,7 +53,9 @@ struct perf_tool {
itrace_start,
context_switch,
throttle,
- unthrottle;
+ unthrottle,
+ ksymbol;
+
event_attr_op attr;
event_attr_op event_update;
event_op2 tracing_data;
^ permalink raw reply related [flat|nested] 33+ messages in thread
* [PATCH v11 perf, bpf-next 6/9] perf util: handle PERF_RECORD_BPF_EVENT
2019-01-17 16:15 [PATCH v11 perf, bpf-next 0/9] reveal invisible bpf programs Song Liu
` (4 preceding siblings ...)
2019-01-17 16:15 ` [PATCH v11 perf, bpf-next 5/9] perf util: handle PERF_RECORD_KSYMBOL Song Liu
@ 2019-01-17 16:15 ` Song Liu
2019-01-18 14:46 ` Arnaldo Carvalho de Melo
2019-01-22 10:21 ` [tip:perf/core] perf tools: Handle PERF_RECORD_BPF_EVENT tip-bot for Song Liu
2019-01-17 16:15 ` [PATCH v11 perf, bpf-next 7/9] perf tools: synthesize PERF_RECORD_* for loaded BPF programs Song Liu
` (2 subsequent siblings)
8 siblings, 2 replies; 33+ messages in thread
From: Song Liu @ 2019-01-17 16:15 UTC (permalink / raw)
To: linux-kernel, netdev; +Cc: Song Liu, peterz, acme, ast, daniel, kernel-team
This patch adds basic handling of PERF_RECORD_BPF_EVENT.
Tracking of PERF_RECORD_BPF_EVENT is OFF by default. Option --bpf-event
is added to turn it on.
Signed-off-by: Song Liu <songliubraving@fb.com>
---
tools/perf/builtin-record.c | 1 +
tools/perf/perf.h | 1 +
tools/perf/util/Build | 2 ++
tools/perf/util/bpf-event.c | 15 +++++++++++++++
tools/perf/util/bpf-event.h | 11 +++++++++++
tools/perf/util/event.c | 20 ++++++++++++++++++++
tools/perf/util/event.h | 16 ++++++++++++++++
tools/perf/util/evsel.c | 11 ++++++++++-
tools/perf/util/evsel.h | 1 +
tools/perf/util/machine.c | 3 +++
tools/perf/util/session.c | 4 ++++
tools/perf/util/tool.h | 3 ++-
12 files changed, 86 insertions(+), 2 deletions(-)
create mode 100644 tools/perf/util/bpf-event.c
create mode 100644 tools/perf/util/bpf-event.h
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 882285fb9f64..deaf9b902094 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -1839,6 +1839,7 @@ static struct option __record_options[] = {
OPT_BOOLEAN(0, "tail-synthesize", &record.opts.tail_synthesize,
"synthesize non-sample events at the end of output"),
OPT_BOOLEAN(0, "overwrite", &record.opts.overwrite, "use overwrite mode"),
+ OPT_BOOLEAN(0, "bpf-event", &record.opts.bpf_event, "record bpf events"),
OPT_BOOLEAN(0, "strict-freq", &record.opts.strict_freq,
"Fail if the specified frequency can't be used"),
OPT_CALLBACK('F', "freq", &record.opts, "freq or 'max'",
diff --git a/tools/perf/perf.h b/tools/perf/perf.h
index 388c6dd128b8..5941fb6eccfc 100644
--- a/tools/perf/perf.h
+++ b/tools/perf/perf.h
@@ -66,6 +66,7 @@ struct record_opts {
bool ignore_missing_thread;
bool strict_freq;
bool sample_id;
+ bool bpf_event;
unsigned int freq;
unsigned int mmap_pages;
unsigned int auxtrace_mmap_pages;
diff --git a/tools/perf/util/Build b/tools/perf/util/Build
index af72be7f5b3b..fa8305390315 100644
--- a/tools/perf/util/Build
+++ b/tools/perf/util/Build
@@ -152,6 +152,8 @@ endif
libperf-y += perf-hooks.o
+libperf-$(CONFIG_LIBBPF) += bpf-event.o
+
libperf-$(CONFIG_CXX) += c++/
CFLAGS_config.o += -DETC_PERFCONFIG="BUILD_STR($(ETC_PERFCONFIG_SQ))"
diff --git a/tools/perf/util/bpf-event.c b/tools/perf/util/bpf-event.c
new file mode 100644
index 000000000000..87004706874f
--- /dev/null
+++ b/tools/perf/util/bpf-event.c
@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <errno.h>
+#include <bpf/bpf.h>
+#include "bpf-event.h"
+#include "debug.h"
+#include "symbol.h"
+
+int machine__process_bpf_event(struct machine *machine __maybe_unused,
+ union perf_event *event,
+ struct perf_sample *sample __maybe_unused)
+{
+ if (dump_trace)
+ perf_event__fprintf_bpf_event(event, stdout);
+ return 0;
+}
diff --git a/tools/perf/util/bpf-event.h b/tools/perf/util/bpf-event.h
new file mode 100644
index 000000000000..d5ca355dd298
--- /dev/null
+++ b/tools/perf/util/bpf-event.h
@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __PERF_BPF_EVENT_H
+#define __PERF_BPF_EVENT_H
+
+#include "machine.h"
+
+int machine__process_bpf_event(struct machine *machine,
+ union perf_event *event,
+ struct perf_sample *sample);
+
+#endif
diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
index 3c8a6a8dd260..3b646d27374e 100644
--- a/tools/perf/util/event.c
+++ b/tools/perf/util/event.c
@@ -25,6 +25,7 @@
#include "asm/bug.h"
#include "stat.h"
#include "session.h"
+#include "bpf-event.h"
#define DEFAULT_PROC_MAP_PARSE_TIMEOUT 500
@@ -47,6 +48,7 @@ static const char *perf_event__names[] = {
[PERF_RECORD_SWITCH_CPU_WIDE] = "SWITCH_CPU_WIDE",
[PERF_RECORD_NAMESPACES] = "NAMESPACES",
[PERF_RECORD_KSYMBOL] = "KSYMBOL",
+ [PERF_RECORD_BPF_EVENT] = "BPF_EVENT",
[PERF_RECORD_HEADER_ATTR] = "ATTR",
[PERF_RECORD_HEADER_EVENT_TYPE] = "EVENT_TYPE",
[PERF_RECORD_HEADER_TRACING_DATA] = "TRACING_DATA",
@@ -1339,6 +1341,14 @@ int perf_event__process_ksymbol(struct perf_tool *tool __maybe_unused,
return machine__process_ksymbol(machine, event, sample);
}
+int perf_event__process_bpf_event(struct perf_tool *tool __maybe_unused,
+ union perf_event *event,
+ struct perf_sample *sample __maybe_unused,
+ struct machine *machine)
+{
+ return machine__process_bpf_event(machine, event, sample);
+}
+
size_t perf_event__fprintf_mmap(union perf_event *event, FILE *fp)
{
return fprintf(fp, " %d/%d: [%#" PRIx64 "(%#" PRIx64 ") @ %#" PRIx64 "]: %c %s\n",
@@ -1479,6 +1489,13 @@ size_t perf_event__fprintf_ksymbol(union perf_event *event, FILE *fp)
event->ksymbol_event.flags, event->ksymbol_event.name);
}
+size_t perf_event__fprintf_bpf_event(union perf_event *event, FILE *fp)
+{
+ return fprintf(fp, " bpf event with type %u, flags %u, id %u\n",
+ event->bpf_event.type, event->bpf_event.flags,
+ event->bpf_event.id);
+}
+
size_t perf_event__fprintf(union perf_event *event, FILE *fp)
{
size_t ret = fprintf(fp, "PERF_RECORD_%s",
@@ -1517,6 +1534,9 @@ size_t perf_event__fprintf(union perf_event *event, FILE *fp)
case PERF_RECORD_KSYMBOL:
ret += perf_event__fprintf_ksymbol(event, fp);
break;
+ case PERF_RECORD_BPF_EVENT:
+ ret += perf_event__fprintf_bpf_event(event, fp);
+ break;
default:
ret += fprintf(fp, "\n");
}
diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
index 018322f2a13e..dad32b81fe71 100644
--- a/tools/perf/util/event.h
+++ b/tools/perf/util/event.h
@@ -98,6 +98,16 @@ struct ksymbol_event {
char name[KSYM_NAME_LEN];
};
+struct bpf_event {
+ struct perf_event_header header;
+ u16 type;
+ u16 flags;
+ u32 id;
+
+ /* for bpf_prog types */
+ u8 tag[BPF_TAG_SIZE]; // prog tag
+};
+
#define PERF_SAMPLE_MASK \
(PERF_SAMPLE_IP | PERF_SAMPLE_TID | \
PERF_SAMPLE_TIME | PERF_SAMPLE_ADDR | \
@@ -666,6 +676,7 @@ union perf_event {
struct time_conv_event time_conv;
struct feature_event feat;
struct ksymbol_event ksymbol_event;
+ struct bpf_event bpf_event;
};
void perf_event__print_totals(void);
@@ -767,6 +778,10 @@ int perf_event__process_ksymbol(struct perf_tool *tool,
union perf_event *event,
struct perf_sample *sample,
struct machine *machine);
+int perf_event__process_bpf_event(struct perf_tool *tool,
+ union perf_event *event,
+ struct perf_sample *sample,
+ struct machine *machine);
int perf_tool__process_synth_event(struct perf_tool *tool,
union perf_event *event,
struct machine *machine,
@@ -831,6 +846,7 @@ size_t perf_event__fprintf_thread_map(union perf_event *event, FILE *fp);
size_t perf_event__fprintf_cpu_map(union perf_event *event, FILE *fp);
size_t perf_event__fprintf_namespaces(union perf_event *event, FILE *fp);
size_t perf_event__fprintf_ksymbol(union perf_event *event, FILE *fp);
+size_t perf_event__fprintf_bpf_event(union perf_event *event, FILE *fp);
size_t perf_event__fprintf(union perf_event *event, FILE *fp);
int kallsyms__get_function_start(const char *kallsyms_filename,
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 9c8dc6d1aa7f..684c893ca6bc 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -1036,6 +1036,8 @@ void perf_evsel__config(struct perf_evsel *evsel, struct record_opts *opts,
attr->mmap2 = track && !perf_missing_features.mmap2;
attr->comm = track;
attr->ksymbol = track && !perf_missing_features.ksymbol;
+ attr->bpf_event = track && opts->bpf_event &&
+ !perf_missing_features.bpf_event;
if (opts->record_namespaces)
attr->namespaces = track;
@@ -1654,6 +1656,7 @@ int perf_event_attr__fprintf(FILE *fp, struct perf_event_attr *attr,
PRINT_ATTRf(write_backward, p_unsigned);
PRINT_ATTRf(namespaces, p_unsigned);
PRINT_ATTRf(ksymbol, p_unsigned);
+ PRINT_ATTRf(bpf_event, p_unsigned);
PRINT_ATTRn("{ wakeup_events, wakeup_watermark }", wakeup_events, p_unsigned);
PRINT_ATTRf(bp_type, p_unsigned);
@@ -1815,6 +1818,8 @@ int perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
evsel->attr.read_format &= ~(PERF_FORMAT_GROUP|PERF_FORMAT_ID);
if (perf_missing_features.ksymbol)
evsel->attr.ksymbol = 0;
+ if (perf_missing_features.bpf_event)
+ evsel->attr.bpf_event = 0;
retry_sample_id:
if (perf_missing_features.sample_id_all)
evsel->attr.sample_id_all = 0;
@@ -1934,7 +1939,11 @@ int perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
* Must probe features in the order they were added to the
* perf_event_attr interface.
*/
- if (!perf_missing_features.ksymbol && evsel->attr.ksymbol) {
+ if (!perf_missing_features.bpf_event && evsel->attr.bpf_event) {
+ perf_missing_features.bpf_event = true;
+ pr_debug2("switching off bpf_event\n");
+ goto fallback_missing_features;
+ } else if (!perf_missing_features.ksymbol && evsel->attr.ksymbol) {
perf_missing_features.ksymbol = true;
pr_debug2("switching off ksymbol\n");
goto fallback_missing_features;
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index 4a8c3e7f4808..29c5eb68c44b 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -169,6 +169,7 @@ struct perf_missing_features {
bool write_backward;
bool group_read;
bool ksymbol;
+ bool bpf_event;
};
extern struct perf_missing_features perf_missing_features;
diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index 9bca61c7d5bf..ae85106bb5bf 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -21,6 +21,7 @@
#include "unwind.h"
#include "linux/hash.h"
#include "asm/bug.h"
+#include "bpf-event.h"
#include "sane_ctype.h"
#include <symbol/kallsyms.h>
@@ -1867,6 +1868,8 @@ int machine__process_event(struct machine *machine, union perf_event *event,
ret = machine__process_switch_event(machine, event); break;
case PERF_RECORD_KSYMBOL:
ret = machine__process_ksymbol(machine, event, sample); break;
+ case PERF_RECORD_BPF_EVENT:
+ ret = machine__process_bpf_event(machine, event, sample); break;
default:
ret = -1;
break;
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 2efa75bb0c0a..026bf04bba74 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -378,6 +378,8 @@ void perf_tool__fill_defaults(struct perf_tool *tool)
tool->context_switch = perf_event__process_switch;
if (tool->ksymbol == NULL)
tool->ksymbol = perf_event__process_ksymbol;
+ if (tool->bpf_event == NULL)
+ tool->bpf_event = perf_event__process_bpf_event;
if (tool->read == NULL)
tool->read = process_event_sample_stub;
if (tool->throttle == NULL)
@@ -1309,6 +1311,8 @@ static int machines__deliver_event(struct machines *machines,
return tool->context_switch(tool, event, sample, machine);
case PERF_RECORD_KSYMBOL:
return tool->ksymbol(tool, event, sample, machine);
+ case PERF_RECORD_BPF_EVENT:
+ return tool->bpf_event(tool, event, sample, machine);
default:
++evlist->stats.nr_unknown_events;
return -1;
diff --git a/tools/perf/util/tool.h b/tools/perf/util/tool.h
index 9c81ca2f3cf7..250391672f9f 100644
--- a/tools/perf/util/tool.h
+++ b/tools/perf/util/tool.h
@@ -54,7 +54,8 @@ struct perf_tool {
context_switch,
throttle,
unthrottle,
- ksymbol;
+ ksymbol,
+ bpf_event;
event_attr_op attr;
event_attr_op event_update;
--
2.17.1
^ permalink raw reply related [flat|nested] 33+ messages in thread* Re: [PATCH v11 perf, bpf-next 6/9] perf util: handle PERF_RECORD_BPF_EVENT
2019-01-17 16:15 ` [PATCH v11 perf, bpf-next 6/9] perf util: handle PERF_RECORD_BPF_EVENT Song Liu
@ 2019-01-18 14:46 ` Arnaldo Carvalho de Melo
2019-01-22 10:21 ` [tip:perf/core] perf tools: Handle PERF_RECORD_BPF_EVENT tip-bot for Song Liu
1 sibling, 0 replies; 33+ messages in thread
From: Arnaldo Carvalho de Melo @ 2019-01-18 14:46 UTC (permalink / raw)
To: Song Liu; +Cc: linux-kernel, netdev, peterz, ast, daniel, kernel-team
Em Thu, Jan 17, 2019 at 08:15:18AM -0800, Song Liu escreveu:
> This patch adds basic handling of PERF_RECORD_BPF_EVENT.
> Tracking of PERF_RECORD_BPF_EVENT is OFF by default. Option --bpf-event
> is added to turn it on.
ditto
> Signed-off-by: Song Liu <songliubraving@fb.com>
> ---
> tools/perf/builtin-record.c | 1 +
> tools/perf/perf.h | 1 +
> tools/perf/util/Build | 2 ++
> tools/perf/util/bpf-event.c | 15 +++++++++++++++
> tools/perf/util/bpf-event.h | 11 +++++++++++
> tools/perf/util/event.c | 20 ++++++++++++++++++++
> tools/perf/util/event.h | 16 ++++++++++++++++
> tools/perf/util/evsel.c | 11 ++++++++++-
> tools/perf/util/evsel.h | 1 +
> tools/perf/util/machine.c | 3 +++
> tools/perf/util/session.c | 4 ++++
> tools/perf/util/tool.h | 3 ++-
> 12 files changed, 86 insertions(+), 2 deletions(-)
> create mode 100644 tools/perf/util/bpf-event.c
> create mode 100644 tools/perf/util/bpf-event.h
>
> diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
> index 882285fb9f64..deaf9b902094 100644
> --- a/tools/perf/builtin-record.c
> +++ b/tools/perf/builtin-record.c
> @@ -1839,6 +1839,7 @@ static struct option __record_options[] = {
> OPT_BOOLEAN(0, "tail-synthesize", &record.opts.tail_synthesize,
> "synthesize non-sample events at the end of output"),
> OPT_BOOLEAN(0, "overwrite", &record.opts.overwrite, "use overwrite mode"),
> + OPT_BOOLEAN(0, "bpf-event", &record.opts.bpf_event, "record bpf events"),
> OPT_BOOLEAN(0, "strict-freq", &record.opts.strict_freq,
> "Fail if the specified frequency can't be used"),
> OPT_CALLBACK('F', "freq", &record.opts, "freq or 'max'",
> diff --git a/tools/perf/perf.h b/tools/perf/perf.h
> index 388c6dd128b8..5941fb6eccfc 100644
> --- a/tools/perf/perf.h
> +++ b/tools/perf/perf.h
> @@ -66,6 +66,7 @@ struct record_opts {
> bool ignore_missing_thread;
> bool strict_freq;
> bool sample_id;
> + bool bpf_event;
> unsigned int freq;
> unsigned int mmap_pages;
> unsigned int auxtrace_mmap_pages;
> diff --git a/tools/perf/util/Build b/tools/perf/util/Build
> index af72be7f5b3b..fa8305390315 100644
> --- a/tools/perf/util/Build
> +++ b/tools/perf/util/Build
> @@ -152,6 +152,8 @@ endif
>
> libperf-y += perf-hooks.o
>
> +libperf-$(CONFIG_LIBBPF) += bpf-event.o
> +
> libperf-$(CONFIG_CXX) += c++/
>
> CFLAGS_config.o += -DETC_PERFCONFIG="BUILD_STR($(ETC_PERFCONFIG_SQ))"
> diff --git a/tools/perf/util/bpf-event.c b/tools/perf/util/bpf-event.c
> new file mode 100644
> index 000000000000..87004706874f
> --- /dev/null
> +++ b/tools/perf/util/bpf-event.c
> @@ -0,0 +1,15 @@
> +// SPDX-License-Identifier: GPL-2.0
> +#include <errno.h>
> +#include <bpf/bpf.h>
> +#include "bpf-event.h"
> +#include "debug.h"
> +#include "symbol.h"
> +
> +int machine__process_bpf_event(struct machine *machine __maybe_unused,
> + union perf_event *event,
> + struct perf_sample *sample __maybe_unused)
> +{
> + if (dump_trace)
> + perf_event__fprintf_bpf_event(event, stdout);
> + return 0;
> +}
> diff --git a/tools/perf/util/bpf-event.h b/tools/perf/util/bpf-event.h
> new file mode 100644
> index 000000000000..d5ca355dd298
> --- /dev/null
> +++ b/tools/perf/util/bpf-event.h
> @@ -0,0 +1,11 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef __PERF_BPF_EVENT_H
> +#define __PERF_BPF_EVENT_H
> +
> +#include "machine.h"
> +
> +int machine__process_bpf_event(struct machine *machine,
> + union perf_event *event,
> + struct perf_sample *sample);
> +
> +#endif
> diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
> index 3c8a6a8dd260..3b646d27374e 100644
> --- a/tools/perf/util/event.c
> +++ b/tools/perf/util/event.c
> @@ -25,6 +25,7 @@
> #include "asm/bug.h"
> #include "stat.h"
> #include "session.h"
> +#include "bpf-event.h"
>
> #define DEFAULT_PROC_MAP_PARSE_TIMEOUT 500
>
> @@ -47,6 +48,7 @@ static const char *perf_event__names[] = {
> [PERF_RECORD_SWITCH_CPU_WIDE] = "SWITCH_CPU_WIDE",
> [PERF_RECORD_NAMESPACES] = "NAMESPACES",
> [PERF_RECORD_KSYMBOL] = "KSYMBOL",
> + [PERF_RECORD_BPF_EVENT] = "BPF_EVENT",
> [PERF_RECORD_HEADER_ATTR] = "ATTR",
> [PERF_RECORD_HEADER_EVENT_TYPE] = "EVENT_TYPE",
> [PERF_RECORD_HEADER_TRACING_DATA] = "TRACING_DATA",
> @@ -1339,6 +1341,14 @@ int perf_event__process_ksymbol(struct perf_tool *tool __maybe_unused,
> return machine__process_ksymbol(machine, event, sample);
> }
>
> +int perf_event__process_bpf_event(struct perf_tool *tool __maybe_unused,
> + union perf_event *event,
> + struct perf_sample *sample __maybe_unused,
> + struct machine *machine)
> +{
> + return machine__process_bpf_event(machine, event, sample);
> +}
> +
> size_t perf_event__fprintf_mmap(union perf_event *event, FILE *fp)
> {
> return fprintf(fp, " %d/%d: [%#" PRIx64 "(%#" PRIx64 ") @ %#" PRIx64 "]: %c %s\n",
> @@ -1479,6 +1489,13 @@ size_t perf_event__fprintf_ksymbol(union perf_event *event, FILE *fp)
> event->ksymbol_event.flags, event->ksymbol_event.name);
> }
>
> +size_t perf_event__fprintf_bpf_event(union perf_event *event, FILE *fp)
> +{
> + return fprintf(fp, " bpf event with type %u, flags %u, id %u\n",
> + event->bpf_event.type, event->bpf_event.flags,
> + event->bpf_event.id);
> +}
> +
> size_t perf_event__fprintf(union perf_event *event, FILE *fp)
> {
> size_t ret = fprintf(fp, "PERF_RECORD_%s",
> @@ -1517,6 +1534,9 @@ size_t perf_event__fprintf(union perf_event *event, FILE *fp)
> case PERF_RECORD_KSYMBOL:
> ret += perf_event__fprintf_ksymbol(event, fp);
> break;
> + case PERF_RECORD_BPF_EVENT:
> + ret += perf_event__fprintf_bpf_event(event, fp);
> + break;
> default:
> ret += fprintf(fp, "\n");
> }
> diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
> index 018322f2a13e..dad32b81fe71 100644
> --- a/tools/perf/util/event.h
> +++ b/tools/perf/util/event.h
> @@ -98,6 +98,16 @@ struct ksymbol_event {
> char name[KSYM_NAME_LEN];
> };
>
> +struct bpf_event {
> + struct perf_event_header header;
> + u16 type;
> + u16 flags;
> + u32 id;
> +
> + /* for bpf_prog types */
> + u8 tag[BPF_TAG_SIZE]; // prog tag
> +};
> +
> #define PERF_SAMPLE_MASK \
> (PERF_SAMPLE_IP | PERF_SAMPLE_TID | \
> PERF_SAMPLE_TIME | PERF_SAMPLE_ADDR | \
> @@ -666,6 +676,7 @@ union perf_event {
> struct time_conv_event time_conv;
> struct feature_event feat;
> struct ksymbol_event ksymbol_event;
> + struct bpf_event bpf_event;
> };
>
> void perf_event__print_totals(void);
> @@ -767,6 +778,10 @@ int perf_event__process_ksymbol(struct perf_tool *tool,
> union perf_event *event,
> struct perf_sample *sample,
> struct machine *machine);
> +int perf_event__process_bpf_event(struct perf_tool *tool,
> + union perf_event *event,
> + struct perf_sample *sample,
> + struct machine *machine);
> int perf_tool__process_synth_event(struct perf_tool *tool,
> union perf_event *event,
> struct machine *machine,
> @@ -831,6 +846,7 @@ size_t perf_event__fprintf_thread_map(union perf_event *event, FILE *fp);
> size_t perf_event__fprintf_cpu_map(union perf_event *event, FILE *fp);
> size_t perf_event__fprintf_namespaces(union perf_event *event, FILE *fp);
> size_t perf_event__fprintf_ksymbol(union perf_event *event, FILE *fp);
> +size_t perf_event__fprintf_bpf_event(union perf_event *event, FILE *fp);
> size_t perf_event__fprintf(union perf_event *event, FILE *fp);
>
> int kallsyms__get_function_start(const char *kallsyms_filename,
> diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
> index 9c8dc6d1aa7f..684c893ca6bc 100644
> --- a/tools/perf/util/evsel.c
> +++ b/tools/perf/util/evsel.c
> @@ -1036,6 +1036,8 @@ void perf_evsel__config(struct perf_evsel *evsel, struct record_opts *opts,
> attr->mmap2 = track && !perf_missing_features.mmap2;
> attr->comm = track;
> attr->ksymbol = track && !perf_missing_features.ksymbol;
> + attr->bpf_event = track && opts->bpf_event &&
> + !perf_missing_features.bpf_event;
>
> if (opts->record_namespaces)
> attr->namespaces = track;
> @@ -1654,6 +1656,7 @@ int perf_event_attr__fprintf(FILE *fp, struct perf_event_attr *attr,
> PRINT_ATTRf(write_backward, p_unsigned);
> PRINT_ATTRf(namespaces, p_unsigned);
> PRINT_ATTRf(ksymbol, p_unsigned);
> + PRINT_ATTRf(bpf_event, p_unsigned);
>
> PRINT_ATTRn("{ wakeup_events, wakeup_watermark }", wakeup_events, p_unsigned);
> PRINT_ATTRf(bp_type, p_unsigned);
> @@ -1815,6 +1818,8 @@ int perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
> evsel->attr.read_format &= ~(PERF_FORMAT_GROUP|PERF_FORMAT_ID);
> if (perf_missing_features.ksymbol)
> evsel->attr.ksymbol = 0;
> + if (perf_missing_features.bpf_event)
> + evsel->attr.bpf_event = 0;
> retry_sample_id:
> if (perf_missing_features.sample_id_all)
> evsel->attr.sample_id_all = 0;
> @@ -1934,7 +1939,11 @@ int perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
> * Must probe features in the order they were added to the
> * perf_event_attr interface.
> */
> - if (!perf_missing_features.ksymbol && evsel->attr.ksymbol) {
> + if (!perf_missing_features.bpf_event && evsel->attr.bpf_event) {
> + perf_missing_features.bpf_event = true;
> + pr_debug2("switching off bpf_event\n");
> + goto fallback_missing_features;
> + } else if (!perf_missing_features.ksymbol && evsel->attr.ksymbol) {
> perf_missing_features.ksymbol = true;
> pr_debug2("switching off ksymbol\n");
> goto fallback_missing_features;
> diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
> index 4a8c3e7f4808..29c5eb68c44b 100644
> --- a/tools/perf/util/evsel.h
> +++ b/tools/perf/util/evsel.h
> @@ -169,6 +169,7 @@ struct perf_missing_features {
> bool write_backward;
> bool group_read;
> bool ksymbol;
> + bool bpf_event;
> };
>
> extern struct perf_missing_features perf_missing_features;
> diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
> index 9bca61c7d5bf..ae85106bb5bf 100644
> --- a/tools/perf/util/machine.c
> +++ b/tools/perf/util/machine.c
> @@ -21,6 +21,7 @@
> #include "unwind.h"
> #include "linux/hash.h"
> #include "asm/bug.h"
> +#include "bpf-event.h"
>
> #include "sane_ctype.h"
> #include <symbol/kallsyms.h>
> @@ -1867,6 +1868,8 @@ int machine__process_event(struct machine *machine, union perf_event *event,
> ret = machine__process_switch_event(machine, event); break;
> case PERF_RECORD_KSYMBOL:
> ret = machine__process_ksymbol(machine, event, sample); break;
> + case PERF_RECORD_BPF_EVENT:
> + ret = machine__process_bpf_event(machine, event, sample); break;
> default:
> ret = -1;
> break;
> diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
> index 2efa75bb0c0a..026bf04bba74 100644
> --- a/tools/perf/util/session.c
> +++ b/tools/perf/util/session.c
> @@ -378,6 +378,8 @@ void perf_tool__fill_defaults(struct perf_tool *tool)
> tool->context_switch = perf_event__process_switch;
> if (tool->ksymbol == NULL)
> tool->ksymbol = perf_event__process_ksymbol;
> + if (tool->bpf_event == NULL)
> + tool->bpf_event = perf_event__process_bpf_event;
> if (tool->read == NULL)
> tool->read = process_event_sample_stub;
> if (tool->throttle == NULL)
> @@ -1309,6 +1311,8 @@ static int machines__deliver_event(struct machines *machines,
> return tool->context_switch(tool, event, sample, machine);
> case PERF_RECORD_KSYMBOL:
> return tool->ksymbol(tool, event, sample, machine);
> + case PERF_RECORD_BPF_EVENT:
> + return tool->bpf_event(tool, event, sample, machine);
> default:
> ++evlist->stats.nr_unknown_events;
> return -1;
> diff --git a/tools/perf/util/tool.h b/tools/perf/util/tool.h
> index 9c81ca2f3cf7..250391672f9f 100644
> --- a/tools/perf/util/tool.h
> +++ b/tools/perf/util/tool.h
> @@ -54,7 +54,8 @@ struct perf_tool {
> context_switch,
> throttle,
> unthrottle,
> - ksymbol;
> + ksymbol,
> + bpf_event;
>
> event_attr_op attr;
> event_attr_op event_update;
> --
> 2.17.1
--
- Arnaldo
^ permalink raw reply [flat|nested] 33+ messages in thread* [tip:perf/core] perf tools: Handle PERF_RECORD_BPF_EVENT
2019-01-17 16:15 ` [PATCH v11 perf, bpf-next 6/9] perf util: handle PERF_RECORD_BPF_EVENT Song Liu
2019-01-18 14:46 ` Arnaldo Carvalho de Melo
@ 2019-01-22 10:21 ` tip-bot for Song Liu
1 sibling, 0 replies; 33+ messages in thread
From: tip-bot for Song Liu @ 2019-01-22 10:21 UTC (permalink / raw)
To: linux-tip-commits
Cc: hpa, songliubraving, daniel, ast, peterz, tglx, linux-kernel,
acme, mingo
Commit-ID: 45178a928a4b7c6093f6621e627d09909e81cc13
Gitweb: https://git.kernel.org/tip/45178a928a4b7c6093f6621e627d09909e81cc13
Author: Song Liu <songliubraving@fb.com>
AuthorDate: Thu, 17 Jan 2019 08:15:18 -0800
Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Mon, 21 Jan 2019 17:00:57 -0300
perf tools: Handle PERF_RECORD_BPF_EVENT
This patch adds basic handling of PERF_RECORD_BPF_EVENT. Tracking of
PERF_RECORD_BPF_EVENT is OFF by default. Option --bpf-event is added to
turn it on.
Committer notes:
Add dummy machine__process_bpf_event() variant that returns zero for
systems without HAVE_LIBBPF_SUPPORT, such as Alpine Linux, unbreaking
the build in such systems.
Remove the needless include <machine.h> from bpf->event.h, provide just
forward declarations for the structs and unions in the parameters, to
reduce compilation time and needless rebuilds when machine.h gets
changed.
Committer testing:
When running with:
# perf record --bpf-event
On an older kernel where PERF_RECORD_BPF_EVENT and PERF_RECORD_KSYMBOL
is not present, we fallback to removing those two bits from
perf_event_attr, making the tool to continue to work on older kernels:
perf_event_attr:
size 112
{ sample_period, sample_freq } 4000
sample_type IP|TID|TIME|PERIOD
read_format ID
disabled 1
inherit 1
mmap 1
comm 1
freq 1
enable_on_exec 1
task 1
precise_ip 3
sample_id_all 1
exclude_guest 1
mmap2 1
comm_exec 1
ksymbol 1
bpf_event 1
------------------------------------------------------------
sys_perf_event_open: pid 5779 cpu 0 group_fd -1 flags 0x8
sys_perf_event_open failed, error -22
switching off bpf_event
------------------------------------------------------------
perf_event_attr:
size 112
{ sample_period, sample_freq } 4000
sample_type IP|TID|TIME|PERIOD
read_format ID
disabled 1
inherit 1
mmap 1
comm 1
freq 1
enable_on_exec 1
task 1
precise_ip 3
sample_id_all 1
exclude_guest 1
mmap2 1
comm_exec 1
ksymbol 1
------------------------------------------------------------
sys_perf_event_open: pid 5779 cpu 0 group_fd -1 flags 0x8
sys_perf_event_open failed, error -22
switching off ksymbol
------------------------------------------------------------
perf_event_attr:
size 112
{ sample_period, sample_freq } 4000
sample_type IP|TID|TIME|PERIOD
read_format ID
disabled 1
inherit 1
mmap 1
comm 1
freq 1
enable_on_exec 1
task 1
precise_ip 3
sample_id_all 1
exclude_guest 1
mmap2 1
comm_exec 1
------------------------------------------------------------
And then proceeds to work without those two features.
As passing --bpf-event is an explicit action performed by the user, perhaps we
should emit a warning telling that the kernel has no such feature, but this can
be done on top of this patch.
Now with a kernel that supports these events, start the 'record --bpf-event -a'
and then run 'perf trace sleep 10000' that will use the BPF
augmented_raw_syscalls.o prebuilt (for another kernel version even) and thus
should generate PERF_RECORD_BPF_EVENT events:
[root@quaco ~]# perf record -e dummy -a --bpf-event
^C[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.713 MB perf.data ]
[root@quaco ~]# bpftool prog
13: cgroup_skb tag 7be49e3934a125ba gpl
loaded_at 2019-01-19T09:09:43-0300 uid 0
xlated 296B jited 229B memlock 4096B map_ids 13,14
14: cgroup_skb tag 2a142ef67aaad174 gpl
loaded_at 2019-01-19T09:09:43-0300 uid 0
xlated 296B jited 229B memlock 4096B map_ids 13,14
15: cgroup_skb tag 7be49e3934a125ba gpl
loaded_at 2019-01-19T09:09:43-0300 uid 0
xlated 296B jited 229B memlock 4096B map_ids 15,16
16: cgroup_skb tag 2a142ef67aaad174 gpl
loaded_at 2019-01-19T09:09:43-0300 uid 0
xlated 296B jited 229B memlock 4096B map_ids 15,16
17: cgroup_skb tag 7be49e3934a125ba gpl
loaded_at 2019-01-19T09:09:44-0300 uid 0
xlated 296B jited 229B memlock 4096B map_ids 17,18
18: cgroup_skb tag 2a142ef67aaad174 gpl
loaded_at 2019-01-19T09:09:44-0300 uid 0
xlated 296B jited 229B memlock 4096B map_ids 17,18
21: cgroup_skb tag 7be49e3934a125ba gpl
loaded_at 2019-01-19T09:09:45-0300 uid 0
xlated 296B jited 229B memlock 4096B map_ids 21,22
22: cgroup_skb tag 2a142ef67aaad174 gpl
loaded_at 2019-01-19T09:09:45-0300 uid 0
xlated 296B jited 229B memlock 4096B map_ids 21,22
31: tracepoint name sys_enter tag 12504ba9402f952f gpl
loaded_at 2019-01-19T09:19:56-0300 uid 0
xlated 512B jited 374B memlock 4096B map_ids 30,29,28
32: tracepoint name sys_exit tag c1bd85c092d6e4aa gpl
loaded_at 2019-01-19T09:19:56-0300 uid 0
xlated 256B jited 191B memlock 4096B map_ids 30,29
# perf report -D | grep PERF_RECORD_BPF_EVENT | nl
1 0 55834574849 0x4fc8 [0x18]: PERF_RECORD_BPF_EVENT bpf event with type 1, flags 0, id 13
2 0 60129542145 0x5118 [0x18]: PERF_RECORD_BPF_EVENT bpf event with type 1, flags 0, id 14
3 0 64424509441 0x5268 [0x18]: PERF_RECORD_BPF_EVENT bpf event with type 1, flags 0, id 15
4 0 68719476737 0x53b8 [0x18]: PERF_RECORD_BPF_EVENT bpf event with type 1, flags 0, id 16
5 0 73014444033 0x5508 [0x18]: PERF_RECORD_BPF_EVENT bpf event with type 1, flags 0, id 17
6 0 77309411329 0x5658 [0x18]: PERF_RECORD_BPF_EVENT bpf event with type 1, flags 0, id 18
7 0 90194313217 0x57a8 [0x18]: PERF_RECORD_BPF_EVENT bpf event with type 1, flags 0, id 21
8 0 94489280513 0x58f8 [0x18]: PERF_RECORD_BPF_EVENT bpf event with type 1, flags 0, id 22
9 7 620922484360 0xb6390 [0x30]: PERF_RECORD_BPF_EVENT bpf event with type 1, flags 0, id 29
10 7 620922486018 0xb6410 [0x30]: PERF_RECORD_BPF_EVENT bpf event with type 2, flags 0, id 29
11 7 620922579199 0xb6490 [0x30]: PERF_RECORD_BPF_EVENT bpf event with type 1, flags 0, id 30
12 7 620922580240 0xb6510 [0x30]: PERF_RECORD_BPF_EVENT bpf event with type 2, flags 0, id 30
13 7 620922765207 0xb6598 [0x30]: PERF_RECORD_BPF_EVENT bpf event with type 1, flags 0, id 31
14 7 620922874543 0xb6620 [0x30]: PERF_RECORD_BPF_EVENT bpf event with type 1, flags 0, id 32
#
There, the 31 and 32 tracepoint BPF programs put in place by 'perf trace'.
Signed-off-by: Song Liu <songliubraving@fb.com>
Reviewed-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: kernel-team@fb.com
Cc: netdev@vger.kernel.org
Link: http://lkml.kernel.org/r/20190117161521.1341602-7-songliubraving@fb.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/builtin-record.c | 1 +
tools/perf/perf.h | 1 +
tools/perf/util/Build | 2 ++
tools/perf/util/bpf-event.c | 15 +++++++++++++++
tools/perf/util/bpf-event.h | 22 ++++++++++++++++++++++
tools/perf/util/event.c | 20 ++++++++++++++++++++
tools/perf/util/event.h | 16 ++++++++++++++++
tools/perf/util/evsel.c | 11 ++++++++++-
tools/perf/util/evsel.h | 1 +
tools/perf/util/machine.c | 3 +++
tools/perf/util/session.c | 4 ++++
tools/perf/util/tool.h | 3 ++-
12 files changed, 97 insertions(+), 2 deletions(-)
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 882285fb9f64..deaf9b902094 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -1839,6 +1839,7 @@ static struct option __record_options[] = {
OPT_BOOLEAN(0, "tail-synthesize", &record.opts.tail_synthesize,
"synthesize non-sample events at the end of output"),
OPT_BOOLEAN(0, "overwrite", &record.opts.overwrite, "use overwrite mode"),
+ OPT_BOOLEAN(0, "bpf-event", &record.opts.bpf_event, "record bpf events"),
OPT_BOOLEAN(0, "strict-freq", &record.opts.strict_freq,
"Fail if the specified frequency can't be used"),
OPT_CALLBACK('F', "freq", &record.opts, "freq or 'max'",
diff --git a/tools/perf/perf.h b/tools/perf/perf.h
index 388c6dd128b8..5941fb6eccfc 100644
--- a/tools/perf/perf.h
+++ b/tools/perf/perf.h
@@ -66,6 +66,7 @@ struct record_opts {
bool ignore_missing_thread;
bool strict_freq;
bool sample_id;
+ bool bpf_event;
unsigned int freq;
unsigned int mmap_pages;
unsigned int auxtrace_mmap_pages;
diff --git a/tools/perf/util/Build b/tools/perf/util/Build
index 3ad6a800948d..c359af408334 100644
--- a/tools/perf/util/Build
+++ b/tools/perf/util/Build
@@ -154,6 +154,8 @@ endif
libperf-y += perf-hooks.o
+libperf-$(CONFIG_LIBBPF) += bpf-event.o
+
libperf-$(CONFIG_CXX) += c++/
CFLAGS_config.o += -DETC_PERFCONFIG="BUILD_STR($(ETC_PERFCONFIG_SQ))"
diff --git a/tools/perf/util/bpf-event.c b/tools/perf/util/bpf-event.c
new file mode 100644
index 000000000000..87004706874f
--- /dev/null
+++ b/tools/perf/util/bpf-event.c
@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <errno.h>
+#include <bpf/bpf.h>
+#include "bpf-event.h"
+#include "debug.h"
+#include "symbol.h"
+
+int machine__process_bpf_event(struct machine *machine __maybe_unused,
+ union perf_event *event,
+ struct perf_sample *sample __maybe_unused)
+{
+ if (dump_trace)
+ perf_event__fprintf_bpf_event(event, stdout);
+ return 0;
+}
diff --git a/tools/perf/util/bpf-event.h b/tools/perf/util/bpf-event.h
new file mode 100644
index 000000000000..da0dfc035fc6
--- /dev/null
+++ b/tools/perf/util/bpf-event.h
@@ -0,0 +1,22 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __PERF_BPF_EVENT_H
+#define __PERF_BPF_EVENT_H
+
+#include <linux/compiler.h>
+
+struct machine;
+union perf_event;
+struct perf_sample;
+
+#ifdef HAVE_LIBBPF_SUPPORT
+int machine__process_bpf_event(struct machine *machine, union perf_event *event,
+ struct perf_sample *sample);
+#else
+static inline int machine__process_bpf_event(struct machine *machine __maybe_unused,
+ union perf_event *event __maybe_unused,
+ struct perf_sample *sample __maybe_unused)
+{
+ return 0;
+}
+#endif // HAVE_LIBBPF_SUPPORT
+#endif
diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
index f06f3811b25b..1b5091a3d14f 100644
--- a/tools/perf/util/event.c
+++ b/tools/perf/util/event.c
@@ -25,6 +25,7 @@
#include "asm/bug.h"
#include "stat.h"
#include "session.h"
+#include "bpf-event.h"
#define DEFAULT_PROC_MAP_PARSE_TIMEOUT 500
@@ -47,6 +48,7 @@ static const char *perf_event__names[] = {
[PERF_RECORD_SWITCH_CPU_WIDE] = "SWITCH_CPU_WIDE",
[PERF_RECORD_NAMESPACES] = "NAMESPACES",
[PERF_RECORD_KSYMBOL] = "KSYMBOL",
+ [PERF_RECORD_BPF_EVENT] = "BPF_EVENT",
[PERF_RECORD_HEADER_ATTR] = "ATTR",
[PERF_RECORD_HEADER_EVENT_TYPE] = "EVENT_TYPE",
[PERF_RECORD_HEADER_TRACING_DATA] = "TRACING_DATA",
@@ -1339,6 +1341,14 @@ int perf_event__process_ksymbol(struct perf_tool *tool __maybe_unused,
return machine__process_ksymbol(machine, event, sample);
}
+int perf_event__process_bpf_event(struct perf_tool *tool __maybe_unused,
+ union perf_event *event,
+ struct perf_sample *sample __maybe_unused,
+ struct machine *machine)
+{
+ return machine__process_bpf_event(machine, event, sample);
+}
+
size_t perf_event__fprintf_mmap(union perf_event *event, FILE *fp)
{
return fprintf(fp, " %d/%d: [%#" PRIx64 "(%#" PRIx64 ") @ %#" PRIx64 "]: %c %s\n",
@@ -1479,6 +1489,13 @@ size_t perf_event__fprintf_ksymbol(union perf_event *event, FILE *fp)
event->ksymbol_event.flags, event->ksymbol_event.name);
}
+size_t perf_event__fprintf_bpf_event(union perf_event *event, FILE *fp)
+{
+ return fprintf(fp, " bpf event with type %u, flags %u, id %u\n",
+ event->bpf_event.type, event->bpf_event.flags,
+ event->bpf_event.id);
+}
+
size_t perf_event__fprintf(union perf_event *event, FILE *fp)
{
size_t ret = fprintf(fp, "PERF_RECORD_%s",
@@ -1517,6 +1534,9 @@ size_t perf_event__fprintf(union perf_event *event, FILE *fp)
case PERF_RECORD_KSYMBOL:
ret += perf_event__fprintf_ksymbol(event, fp);
break;
+ case PERF_RECORD_BPF_EVENT:
+ ret += perf_event__fprintf_bpf_event(event, fp);
+ break;
default:
ret += fprintf(fp, "\n");
}
diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
index 018322f2a13e..dad32b81fe71 100644
--- a/tools/perf/util/event.h
+++ b/tools/perf/util/event.h
@@ -98,6 +98,16 @@ struct ksymbol_event {
char name[KSYM_NAME_LEN];
};
+struct bpf_event {
+ struct perf_event_header header;
+ u16 type;
+ u16 flags;
+ u32 id;
+
+ /* for bpf_prog types */
+ u8 tag[BPF_TAG_SIZE]; // prog tag
+};
+
#define PERF_SAMPLE_MASK \
(PERF_SAMPLE_IP | PERF_SAMPLE_TID | \
PERF_SAMPLE_TIME | PERF_SAMPLE_ADDR | \
@@ -666,6 +676,7 @@ union perf_event {
struct time_conv_event time_conv;
struct feature_event feat;
struct ksymbol_event ksymbol_event;
+ struct bpf_event bpf_event;
};
void perf_event__print_totals(void);
@@ -767,6 +778,10 @@ int perf_event__process_ksymbol(struct perf_tool *tool,
union perf_event *event,
struct perf_sample *sample,
struct machine *machine);
+int perf_event__process_bpf_event(struct perf_tool *tool,
+ union perf_event *event,
+ struct perf_sample *sample,
+ struct machine *machine);
int perf_tool__process_synth_event(struct perf_tool *tool,
union perf_event *event,
struct machine *machine,
@@ -831,6 +846,7 @@ size_t perf_event__fprintf_thread_map(union perf_event *event, FILE *fp);
size_t perf_event__fprintf_cpu_map(union perf_event *event, FILE *fp);
size_t perf_event__fprintf_namespaces(union perf_event *event, FILE *fp);
size_t perf_event__fprintf_ksymbol(union perf_event *event, FILE *fp);
+size_t perf_event__fprintf_bpf_event(union perf_event *event, FILE *fp);
size_t perf_event__fprintf(union perf_event *event, FILE *fp);
int kallsyms__get_function_start(const char *kallsyms_filename,
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 9c8dc6d1aa7f..684c893ca6bc 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -1036,6 +1036,8 @@ void perf_evsel__config(struct perf_evsel *evsel, struct record_opts *opts,
attr->mmap2 = track && !perf_missing_features.mmap2;
attr->comm = track;
attr->ksymbol = track && !perf_missing_features.ksymbol;
+ attr->bpf_event = track && opts->bpf_event &&
+ !perf_missing_features.bpf_event;
if (opts->record_namespaces)
attr->namespaces = track;
@@ -1654,6 +1656,7 @@ int perf_event_attr__fprintf(FILE *fp, struct perf_event_attr *attr,
PRINT_ATTRf(write_backward, p_unsigned);
PRINT_ATTRf(namespaces, p_unsigned);
PRINT_ATTRf(ksymbol, p_unsigned);
+ PRINT_ATTRf(bpf_event, p_unsigned);
PRINT_ATTRn("{ wakeup_events, wakeup_watermark }", wakeup_events, p_unsigned);
PRINT_ATTRf(bp_type, p_unsigned);
@@ -1815,6 +1818,8 @@ fallback_missing_features:
evsel->attr.read_format &= ~(PERF_FORMAT_GROUP|PERF_FORMAT_ID);
if (perf_missing_features.ksymbol)
evsel->attr.ksymbol = 0;
+ if (perf_missing_features.bpf_event)
+ evsel->attr.bpf_event = 0;
retry_sample_id:
if (perf_missing_features.sample_id_all)
evsel->attr.sample_id_all = 0;
@@ -1934,7 +1939,11 @@ try_fallback:
* Must probe features in the order they were added to the
* perf_event_attr interface.
*/
- if (!perf_missing_features.ksymbol && evsel->attr.ksymbol) {
+ if (!perf_missing_features.bpf_event && evsel->attr.bpf_event) {
+ perf_missing_features.bpf_event = true;
+ pr_debug2("switching off bpf_event\n");
+ goto fallback_missing_features;
+ } else if (!perf_missing_features.ksymbol && evsel->attr.ksymbol) {
perf_missing_features.ksymbol = true;
pr_debug2("switching off ksymbol\n");
goto fallback_missing_features;
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index 4a8c3e7f4808..29c5eb68c44b 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -169,6 +169,7 @@ struct perf_missing_features {
bool write_backward;
bool group_read;
bool ksymbol;
+ bool bpf_event;
};
extern struct perf_missing_features perf_missing_features;
diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index 9bca61c7d5bf..ae85106bb5bf 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -21,6 +21,7 @@
#include "unwind.h"
#include "linux/hash.h"
#include "asm/bug.h"
+#include "bpf-event.h"
#include "sane_ctype.h"
#include <symbol/kallsyms.h>
@@ -1867,6 +1868,8 @@ int machine__process_event(struct machine *machine, union perf_event *event,
ret = machine__process_switch_event(machine, event); break;
case PERF_RECORD_KSYMBOL:
ret = machine__process_ksymbol(machine, event, sample); break;
+ case PERF_RECORD_BPF_EVENT:
+ ret = machine__process_bpf_event(machine, event, sample); break;
default:
ret = -1;
break;
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index dcfacfb036a3..24fd62528a33 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -381,6 +381,8 @@ void perf_tool__fill_defaults(struct perf_tool *tool)
tool->context_switch = perf_event__process_switch;
if (tool->ksymbol == NULL)
tool->ksymbol = perf_event__process_ksymbol;
+ if (tool->bpf_event == NULL)
+ tool->bpf_event = perf_event__process_bpf_event;
if (tool->read == NULL)
tool->read = process_event_sample_stub;
if (tool->throttle == NULL)
@@ -1314,6 +1316,8 @@ static int machines__deliver_event(struct machines *machines,
return tool->context_switch(tool, event, sample, machine);
case PERF_RECORD_KSYMBOL:
return tool->ksymbol(tool, event, sample, machine);
+ case PERF_RECORD_BPF_EVENT:
+ return tool->bpf_event(tool, event, sample, machine);
default:
++evlist->stats.nr_unknown_events;
return -1;
diff --git a/tools/perf/util/tool.h b/tools/perf/util/tool.h
index 9c81ca2f3cf7..250391672f9f 100644
--- a/tools/perf/util/tool.h
+++ b/tools/perf/util/tool.h
@@ -54,7 +54,8 @@ struct perf_tool {
context_switch,
throttle,
unthrottle,
- ksymbol;
+ ksymbol,
+ bpf_event;
event_attr_op attr;
event_attr_op event_update;
^ permalink raw reply related [flat|nested] 33+ messages in thread
* [PATCH v11 perf, bpf-next 7/9] perf tools: synthesize PERF_RECORD_* for loaded BPF programs
2019-01-17 16:15 [PATCH v11 perf, bpf-next 0/9] reveal invisible bpf programs Song Liu
` (5 preceding siblings ...)
2019-01-17 16:15 ` [PATCH v11 perf, bpf-next 6/9] perf util: handle PERF_RECORD_BPF_EVENT Song Liu
@ 2019-01-17 16:15 ` Song Liu
2019-01-18 14:46 ` Arnaldo Carvalho de Melo
2019-01-22 10:22 ` [tip:perf/core] perf tools: Synthesize " tip-bot for Song Liu
2019-01-17 16:15 ` [PATCH v11 perf, bpf-next 8/9] perf top: Synthesize BPF events for pre-existing " Song Liu
2019-01-17 16:15 ` [PATCH v11 perf, bpf-next 9/9] bpf: add module name [bpf] to ksymbols for bpf programs Song Liu
8 siblings, 2 replies; 33+ messages in thread
From: Song Liu @ 2019-01-17 16:15 UTC (permalink / raw)
To: linux-kernel, netdev; +Cc: Song Liu, peterz, acme, ast, daniel, kernel-team
This patch synthesize PERF_RECORD_KSYMBOL and PERF_RECORD_BPF_EVENT for
BPF programs loaded before perf-record. This is achieved by gathering
information about all BPF programs via sys_bpf.
Signed-off-by: Song Liu <songliubraving@fb.com>
---
tools/perf/builtin-record.c | 6 +
tools/perf/util/bpf-event.c | 241 ++++++++++++++++++++++++++++++++++++
tools/perf/util/bpf-event.h | 5 +
3 files changed, 252 insertions(+)
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index deaf9b902094..88ea11d57c6f 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -41,6 +41,7 @@
#include "util/perf-hooks.h"
#include "util/time-utils.h"
#include "util/units.h"
+#include "util/bpf-event.h"
#include "asm/bug.h"
#include <errno.h>
@@ -1082,6 +1083,11 @@ static int record__synthesize(struct record *rec, bool tail)
return err;
}
+ err = perf_event__synthesize_bpf_events(tool, process_synthesized_event,
+ machine, opts);
+ if (err < 0)
+ pr_warning("Couldn't synthesize bpf events.\n");
+
err = __machine__synthesize_threads(machine, tool, &opts->target, rec->evlist->threads,
process_synthesized_event, opts->sample_address,
1);
diff --git a/tools/perf/util/bpf-event.c b/tools/perf/util/bpf-event.c
index 87004706874f..126f9728a756 100644
--- a/tools/perf/util/bpf-event.c
+++ b/tools/perf/util/bpf-event.c
@@ -1,10 +1,24 @@
// SPDX-License-Identifier: GPL-2.0
#include <errno.h>
#include <bpf/bpf.h>
+#include <bpf/btf.h>
+#include <linux/btf.h>
#include "bpf-event.h"
#include "debug.h"
#include "symbol.h"
+#define ptr_to_u64(ptr) ((__u64)(unsigned long)(ptr))
+
+static int snprintf_hex(char *buf, size_t size, unsigned char *data, size_t len)
+{
+ int ret = 0;
+ size_t i;
+
+ for (i = 0; i < len; i++)
+ ret += snprintf(buf + ret, size - ret, "%02x", data[i]);
+ return ret;
+}
+
int machine__process_bpf_event(struct machine *machine __maybe_unused,
union perf_event *event,
struct perf_sample *sample __maybe_unused)
@@ -13,3 +27,230 @@ int machine__process_bpf_event(struct machine *machine __maybe_unused,
perf_event__fprintf_bpf_event(event, stdout);
return 0;
}
+
+/*
+ * Synthesize PERF_RECORD_KSYMBOL and PERF_RECORD_BPF_EVENT for one bpf
+ * program. One PERF_RECORD_BPF_EVENT is generated for the program. And
+ * one PERF_RECORD_KSYMBOL is generated for each sub program.
+ *
+ * Returns:
+ * 0 for success;
+ * -1 for failures;
+ * -2 for lack of kernel support.
+ */
+static int perf_event__synthesize_one_bpf_prog(struct perf_tool *tool,
+ perf_event__handler_t process,
+ struct machine *machine,
+ int fd,
+ union perf_event *event,
+ struct record_opts *opts)
+{
+ struct ksymbol_event *ksymbol_event = &event->ksymbol_event;
+ struct bpf_event *bpf_event = &event->bpf_event;
+ u32 sub_prog_cnt, i, func_info_rec_size;
+ u8 (*prog_tags)[BPF_TAG_SIZE] = NULL;
+ struct bpf_prog_info info = {};
+ u32 info_len = sizeof(info);
+ void *func_infos = NULL;
+ u64 *prog_addrs = NULL;
+ struct btf *btf = NULL;
+ u32 *prog_lens = NULL;
+ bool has_btf = false;
+ char errbuf[512];
+ int err = 0;
+
+ /* Call bpf_obj_get_info_by_fd() to get sizes of arrays */
+ err = bpf_obj_get_info_by_fd(fd, &info, &info_len);
+
+ if (err) {
+ pr_debug("%s: failed to get BPF program info: %s, aborting\n",
+ __func__, str_error_r(errno, errbuf, sizeof(errbuf)));
+ return -1;
+ }
+ if (info_len < offsetof(struct bpf_prog_info, prog_tags)) {
+ pr_debug("%s: the kernel is too old, aborting\n", __func__);
+ return -2;
+ }
+
+ /* number of ksyms, func_lengths, and tags should match */
+ sub_prog_cnt = info.nr_jited_ksyms;
+ if (sub_prog_cnt != info.nr_prog_tags ||
+ sub_prog_cnt != info.nr_jited_func_lens)
+ return -1;
+
+ /* check BTF func info support */
+ if (info.btf_id && info.nr_func_info && info.func_info_rec_size) {
+ /* btf func info number should be same as sub_prog_cnt */
+ if (sub_prog_cnt != info.nr_func_info) {
+ pr_debug("%s: mismatch in BPF sub program count and BTF function info count, aborting\n", __func__);
+ return -1;
+ }
+ if (btf__get_from_id(info.btf_id, &btf)) {
+ pr_debug("%s: failed to get BTF of id %u, aborting\n", __func__, info.btf_id);
+ return -1;
+ }
+ func_info_rec_size = info.func_info_rec_size;
+ func_infos = calloc(sub_prog_cnt, func_info_rec_size);
+ if (!func_infos) {
+ pr_debug("%s: failed to allocate memory for func_infos, aborting\n", __func__);
+ return -1;
+ }
+ has_btf = true;
+ }
+
+ /*
+ * We need address, length, and tag for each sub program.
+ * Allocate memory and call bpf_obj_get_info_by_fd() again
+ */
+ prog_addrs = calloc(sub_prog_cnt, sizeof(u64));
+ if (!prog_addrs) {
+ pr_debug("%s: failed to allocate memory for prog_addrs, aborting\n", __func__);
+ goto out;
+ }
+ prog_lens = calloc(sub_prog_cnt, sizeof(u32));
+ if (!prog_lens) {
+ pr_debug("%s: failed to allocate memory for prog_lens, aborting\n", __func__);
+ goto out;
+ }
+ prog_tags = calloc(sub_prog_cnt, BPF_TAG_SIZE);
+ if (!prog_tags) {
+ pr_debug("%s: failed to allocate memory for prog_tags, aborting\n", __func__);
+ goto out;
+ }
+
+ memset(&info, 0, sizeof(info));
+ info.nr_jited_ksyms = sub_prog_cnt;
+ info.nr_jited_func_lens = sub_prog_cnt;
+ info.nr_prog_tags = sub_prog_cnt;
+ info.jited_ksyms = ptr_to_u64(prog_addrs);
+ info.jited_func_lens = ptr_to_u64(prog_lens);
+ info.prog_tags = ptr_to_u64(prog_tags);
+ info_len = sizeof(info);
+ if (has_btf) {
+ info.nr_func_info = sub_prog_cnt;
+ info.func_info_rec_size = func_info_rec_size;
+ info.func_info = ptr_to_u64(func_infos);
+ }
+
+ err = bpf_obj_get_info_by_fd(fd, &info, &info_len);
+ if (err) {
+ pr_debug("%s: failed to get BPF program info, aborting\n", __func__);
+ goto out;
+ }
+
+ /* Synthesize PERF_RECORD_KSYMBOL */
+ for (i = 0; i < sub_prog_cnt; i++) {
+ const struct bpf_func_info *finfo;
+ const char *short_name = NULL;
+ const struct btf_type *t;
+ int name_len;
+
+ *ksymbol_event = (struct ksymbol_event){
+ .header = {
+ .type = PERF_RECORD_KSYMBOL,
+ .size = sizeof(struct ksymbol_event),
+ },
+ .addr = prog_addrs[i],
+ .len = prog_lens[i],
+ .ksym_type = PERF_RECORD_KSYMBOL_TYPE_BPF,
+ .flags = 0,
+ };
+ name_len = snprintf(ksymbol_event->name, KSYM_NAME_LEN,
+ "bpf_prog_");
+ name_len += snprintf_hex(ksymbol_event->name + name_len,
+ KSYM_NAME_LEN - name_len,
+ prog_tags[i], BPF_TAG_SIZE);
+ if (has_btf) {
+ finfo = func_infos + i * info.func_info_rec_size;
+ t = btf__type_by_id(btf, finfo->type_id);
+ short_name = btf__name_by_offset(btf, t->name_off);
+ } else if (i == 0 && sub_prog_cnt == 1) {
+ /* no subprog */
+ if (info.name[0])
+ short_name = info.name;
+ } else
+ short_name = "F";
+ if (short_name)
+ name_len += snprintf(ksymbol_event->name + name_len,
+ KSYM_NAME_LEN - name_len,
+ "_%s", short_name);
+
+ ksymbol_event->header.size += PERF_ALIGN(name_len + 1,
+ sizeof(u64));
+ err = perf_tool__process_synth_event(tool, event,
+ machine, process);
+ }
+
+ /* Synthesize PERF_RECORD_BPF_EVENT */
+ if (opts->bpf_event) {
+ *bpf_event = (struct bpf_event){
+ .header = {
+ .type = PERF_RECORD_BPF_EVENT,
+ .size = sizeof(struct bpf_event),
+ },
+ .type = PERF_BPF_EVENT_PROG_LOAD,
+ .flags = 0,
+ .id = info.id,
+ };
+ memcpy(bpf_event->tag, prog_tags[i], BPF_TAG_SIZE);
+ err = perf_tool__process_synth_event(tool, event,
+ machine, process);
+ }
+
+out:
+ free(prog_tags);
+ free(prog_lens);
+ free(prog_addrs);
+ free(func_infos);
+ free(btf);
+ return err ? -1 : 0;
+}
+
+int perf_event__synthesize_bpf_events(struct perf_tool *tool,
+ perf_event__handler_t process,
+ struct machine *machine,
+ struct record_opts *opts)
+{
+ union perf_event *event;
+ __u32 id = 0;
+ int err;
+ int fd;
+
+ event = malloc(sizeof(event->bpf_event) + KSYM_NAME_LEN);
+ if (!event)
+ return -1;
+ while (true) {
+ err = bpf_prog_get_next_id(id, &id);
+ if (err) {
+ if (errno == ENOENT) {
+ err = 0;
+ break;
+ }
+ pr_debug("%s: can't get next program: %s%s",
+ __func__, strerror(errno),
+ errno == EINVAL ? " -- kernel too old?" : "");
+ /* don't report error on old kernel */
+ err = (errno == EINVAL) ? 0 : -1;
+ break;
+ }
+ fd = bpf_prog_get_fd_by_id(id);
+ if (fd < 0) {
+ pr_debug("%s: failed to get fd for prog_id %u\n",
+ __func__, id);
+ continue;
+ }
+
+ err = perf_event__synthesize_one_bpf_prog(tool, process,
+ machine, fd,
+ event, opts);
+ close(fd);
+ if (err) {
+ /* do not return error for old kernel */
+ if (err == -2)
+ err = 0;
+ break;
+ }
+ }
+ free(event);
+ return err;
+}
diff --git a/tools/perf/util/bpf-event.h b/tools/perf/util/bpf-event.h
index d5ca355dd298..38aee4040f12 100644
--- a/tools/perf/util/bpf-event.h
+++ b/tools/perf/util/bpf-event.h
@@ -8,4 +8,9 @@ int machine__process_bpf_event(struct machine *machine,
union perf_event *event,
struct perf_sample *sample);
+int perf_event__synthesize_bpf_events(struct perf_tool *tool,
+ perf_event__handler_t process,
+ struct machine *machine,
+ struct record_opts *opts);
+
#endif
--
2.17.1
^ permalink raw reply related [flat|nested] 33+ messages in thread* Re: [PATCH v11 perf, bpf-next 7/9] perf tools: synthesize PERF_RECORD_* for loaded BPF programs
2019-01-17 16:15 ` [PATCH v11 perf, bpf-next 7/9] perf tools: synthesize PERF_RECORD_* for loaded BPF programs Song Liu
@ 2019-01-18 14:46 ` Arnaldo Carvalho de Melo
2019-01-22 14:13 ` Arnaldo Carvalho de Melo
2019-01-22 10:22 ` [tip:perf/core] perf tools: Synthesize " tip-bot for Song Liu
1 sibling, 1 reply; 33+ messages in thread
From: Arnaldo Carvalho de Melo @ 2019-01-18 14:46 UTC (permalink / raw)
To: Song Liu; +Cc: linux-kernel, netdev, peterz, ast, daniel, kernel-team
Em Thu, Jan 17, 2019 at 08:15:19AM -0800, Song Liu escreveu:
> This patch synthesize PERF_RECORD_KSYMBOL and PERF_RECORD_BPF_EVENT for
> BPF programs loaded before perf-record. This is achieved by gathering
> information about all BPF programs via sys_bpf.
Ditto
> Signed-off-by: Song Liu <songliubraving@fb.com>
> ---
> tools/perf/builtin-record.c | 6 +
> tools/perf/util/bpf-event.c | 241 ++++++++++++++++++++++++++++++++++++
> tools/perf/util/bpf-event.h | 5 +
> 3 files changed, 252 insertions(+)
>
> diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
> index deaf9b902094..88ea11d57c6f 100644
> --- a/tools/perf/builtin-record.c
> +++ b/tools/perf/builtin-record.c
> @@ -41,6 +41,7 @@
> #include "util/perf-hooks.h"
> #include "util/time-utils.h"
> #include "util/units.h"
> +#include "util/bpf-event.h"
> #include "asm/bug.h"
>
> #include <errno.h>
> @@ -1082,6 +1083,11 @@ static int record__synthesize(struct record *rec, bool tail)
> return err;
> }
>
> + err = perf_event__synthesize_bpf_events(tool, process_synthesized_event,
> + machine, opts);
> + if (err < 0)
> + pr_warning("Couldn't synthesize bpf events.\n");
> +
> err = __machine__synthesize_threads(machine, tool, &opts->target, rec->evlist->threads,
> process_synthesized_event, opts->sample_address,
> 1);
> diff --git a/tools/perf/util/bpf-event.c b/tools/perf/util/bpf-event.c
> index 87004706874f..126f9728a756 100644
> --- a/tools/perf/util/bpf-event.c
> +++ b/tools/perf/util/bpf-event.c
> @@ -1,10 +1,24 @@
> // SPDX-License-Identifier: GPL-2.0
> #include <errno.h>
> #include <bpf/bpf.h>
> +#include <bpf/btf.h>
> +#include <linux/btf.h>
> #include "bpf-event.h"
> #include "debug.h"
> #include "symbol.h"
>
> +#define ptr_to_u64(ptr) ((__u64)(unsigned long)(ptr))
> +
> +static int snprintf_hex(char *buf, size_t size, unsigned char *data, size_t len)
> +{
> + int ret = 0;
> + size_t i;
> +
> + for (i = 0; i < len; i++)
> + ret += snprintf(buf + ret, size - ret, "%02x", data[i]);
> + return ret;
> +}
> +
> int machine__process_bpf_event(struct machine *machine __maybe_unused,
> union perf_event *event,
> struct perf_sample *sample __maybe_unused)
> @@ -13,3 +27,230 @@ int machine__process_bpf_event(struct machine *machine __maybe_unused,
> perf_event__fprintf_bpf_event(event, stdout);
> return 0;
> }
> +
> +/*
> + * Synthesize PERF_RECORD_KSYMBOL and PERF_RECORD_BPF_EVENT for one bpf
> + * program. One PERF_RECORD_BPF_EVENT is generated for the program. And
> + * one PERF_RECORD_KSYMBOL is generated for each sub program.
> + *
> + * Returns:
> + * 0 for success;
> + * -1 for failures;
> + * -2 for lack of kernel support.
> + */
> +static int perf_event__synthesize_one_bpf_prog(struct perf_tool *tool,
> + perf_event__handler_t process,
> + struct machine *machine,
> + int fd,
> + union perf_event *event,
> + struct record_opts *opts)
> +{
> + struct ksymbol_event *ksymbol_event = &event->ksymbol_event;
> + struct bpf_event *bpf_event = &event->bpf_event;
> + u32 sub_prog_cnt, i, func_info_rec_size;
> + u8 (*prog_tags)[BPF_TAG_SIZE] = NULL;
> + struct bpf_prog_info info = {};
> + u32 info_len = sizeof(info);
> + void *func_infos = NULL;
> + u64 *prog_addrs = NULL;
> + struct btf *btf = NULL;
> + u32 *prog_lens = NULL;
> + bool has_btf = false;
> + char errbuf[512];
> + int err = 0;
> +
> + /* Call bpf_obj_get_info_by_fd() to get sizes of arrays */
> + err = bpf_obj_get_info_by_fd(fd, &info, &info_len);
> +
> + if (err) {
> + pr_debug("%s: failed to get BPF program info: %s, aborting\n",
> + __func__, str_error_r(errno, errbuf, sizeof(errbuf)));
> + return -1;
> + }
> + if (info_len < offsetof(struct bpf_prog_info, prog_tags)) {
> + pr_debug("%s: the kernel is too old, aborting\n", __func__);
> + return -2;
> + }
> +
> + /* number of ksyms, func_lengths, and tags should match */
> + sub_prog_cnt = info.nr_jited_ksyms;
> + if (sub_prog_cnt != info.nr_prog_tags ||
> + sub_prog_cnt != info.nr_jited_func_lens)
> + return -1;
> +
> + /* check BTF func info support */
> + if (info.btf_id && info.nr_func_info && info.func_info_rec_size) {
> + /* btf func info number should be same as sub_prog_cnt */
> + if (sub_prog_cnt != info.nr_func_info) {
> + pr_debug("%s: mismatch in BPF sub program count and BTF function info count, aborting\n", __func__);
> + return -1;
> + }
> + if (btf__get_from_id(info.btf_id, &btf)) {
> + pr_debug("%s: failed to get BTF of id %u, aborting\n", __func__, info.btf_id);
> + return -1;
> + }
> + func_info_rec_size = info.func_info_rec_size;
> + func_infos = calloc(sub_prog_cnt, func_info_rec_size);
> + if (!func_infos) {
> + pr_debug("%s: failed to allocate memory for func_infos, aborting\n", __func__);
> + return -1;
> + }
> + has_btf = true;
> + }
> +
> + /*
> + * We need address, length, and tag for each sub program.
> + * Allocate memory and call bpf_obj_get_info_by_fd() again
> + */
> + prog_addrs = calloc(sub_prog_cnt, sizeof(u64));
> + if (!prog_addrs) {
> + pr_debug("%s: failed to allocate memory for prog_addrs, aborting\n", __func__);
> + goto out;
> + }
> + prog_lens = calloc(sub_prog_cnt, sizeof(u32));
> + if (!prog_lens) {
> + pr_debug("%s: failed to allocate memory for prog_lens, aborting\n", __func__);
> + goto out;
> + }
> + prog_tags = calloc(sub_prog_cnt, BPF_TAG_SIZE);
> + if (!prog_tags) {
> + pr_debug("%s: failed to allocate memory for prog_tags, aborting\n", __func__);
> + goto out;
> + }
> +
> + memset(&info, 0, sizeof(info));
> + info.nr_jited_ksyms = sub_prog_cnt;
> + info.nr_jited_func_lens = sub_prog_cnt;
> + info.nr_prog_tags = sub_prog_cnt;
> + info.jited_ksyms = ptr_to_u64(prog_addrs);
> + info.jited_func_lens = ptr_to_u64(prog_lens);
> + info.prog_tags = ptr_to_u64(prog_tags);
> + info_len = sizeof(info);
> + if (has_btf) {
> + info.nr_func_info = sub_prog_cnt;
> + info.func_info_rec_size = func_info_rec_size;
> + info.func_info = ptr_to_u64(func_infos);
> + }
> +
> + err = bpf_obj_get_info_by_fd(fd, &info, &info_len);
> + if (err) {
> + pr_debug("%s: failed to get BPF program info, aborting\n", __func__);
> + goto out;
> + }
> +
> + /* Synthesize PERF_RECORD_KSYMBOL */
> + for (i = 0; i < sub_prog_cnt; i++) {
> + const struct bpf_func_info *finfo;
> + const char *short_name = NULL;
> + const struct btf_type *t;
> + int name_len;
> +
> + *ksymbol_event = (struct ksymbol_event){
> + .header = {
> + .type = PERF_RECORD_KSYMBOL,
> + .size = sizeof(struct ksymbol_event),
> + },
> + .addr = prog_addrs[i],
> + .len = prog_lens[i],
> + .ksym_type = PERF_RECORD_KSYMBOL_TYPE_BPF,
> + .flags = 0,
> + };
> + name_len = snprintf(ksymbol_event->name, KSYM_NAME_LEN,
> + "bpf_prog_");
> + name_len += snprintf_hex(ksymbol_event->name + name_len,
> + KSYM_NAME_LEN - name_len,
> + prog_tags[i], BPF_TAG_SIZE);
> + if (has_btf) {
> + finfo = func_infos + i * info.func_info_rec_size;
> + t = btf__type_by_id(btf, finfo->type_id);
> + short_name = btf__name_by_offset(btf, t->name_off);
> + } else if (i == 0 && sub_prog_cnt == 1) {
> + /* no subprog */
> + if (info.name[0])
> + short_name = info.name;
> + } else
> + short_name = "F";
> + if (short_name)
> + name_len += snprintf(ksymbol_event->name + name_len,
> + KSYM_NAME_LEN - name_len,
> + "_%s", short_name);
> +
> + ksymbol_event->header.size += PERF_ALIGN(name_len + 1,
> + sizeof(u64));
> + err = perf_tool__process_synth_event(tool, event,
> + machine, process);
> + }
> +
> + /* Synthesize PERF_RECORD_BPF_EVENT */
> + if (opts->bpf_event) {
> + *bpf_event = (struct bpf_event){
> + .header = {
> + .type = PERF_RECORD_BPF_EVENT,
> + .size = sizeof(struct bpf_event),
> + },
> + .type = PERF_BPF_EVENT_PROG_LOAD,
> + .flags = 0,
> + .id = info.id,
> + };
> + memcpy(bpf_event->tag, prog_tags[i], BPF_TAG_SIZE);
> + err = perf_tool__process_synth_event(tool, event,
> + machine, process);
> + }
> +
> +out:
> + free(prog_tags);
> + free(prog_lens);
> + free(prog_addrs);
> + free(func_infos);
> + free(btf);
> + return err ? -1 : 0;
> +}
> +
> +int perf_event__synthesize_bpf_events(struct perf_tool *tool,
> + perf_event__handler_t process,
> + struct machine *machine,
> + struct record_opts *opts)
> +{
> + union perf_event *event;
> + __u32 id = 0;
> + int err;
> + int fd;
> +
> + event = malloc(sizeof(event->bpf_event) + KSYM_NAME_LEN);
> + if (!event)
> + return -1;
> + while (true) {
> + err = bpf_prog_get_next_id(id, &id);
> + if (err) {
> + if (errno == ENOENT) {
> + err = 0;
> + break;
> + }
> + pr_debug("%s: can't get next program: %s%s",
> + __func__, strerror(errno),
> + errno == EINVAL ? " -- kernel too old?" : "");
> + /* don't report error on old kernel */
> + err = (errno == EINVAL) ? 0 : -1;
> + break;
> + }
> + fd = bpf_prog_get_fd_by_id(id);
> + if (fd < 0) {
> + pr_debug("%s: failed to get fd for prog_id %u\n",
> + __func__, id);
> + continue;
> + }
> +
> + err = perf_event__synthesize_one_bpf_prog(tool, process,
> + machine, fd,
> + event, opts);
> + close(fd);
> + if (err) {
> + /* do not return error for old kernel */
> + if (err == -2)
> + err = 0;
> + break;
> + }
> + }
> + free(event);
> + return err;
> +}
> diff --git a/tools/perf/util/bpf-event.h b/tools/perf/util/bpf-event.h
> index d5ca355dd298..38aee4040f12 100644
> --- a/tools/perf/util/bpf-event.h
> +++ b/tools/perf/util/bpf-event.h
> @@ -8,4 +8,9 @@ int machine__process_bpf_event(struct machine *machine,
> union perf_event *event,
> struct perf_sample *sample);
>
> +int perf_event__synthesize_bpf_events(struct perf_tool *tool,
> + perf_event__handler_t process,
> + struct machine *machine,
> + struct record_opts *opts);
> +
> #endif
> --
> 2.17.1
--
- Arnaldo
^ permalink raw reply [flat|nested] 33+ messages in thread* Re: [PATCH v11 perf, bpf-next 7/9] perf tools: synthesize PERF_RECORD_* for loaded BPF programs
2019-01-18 14:46 ` Arnaldo Carvalho de Melo
@ 2019-01-22 14:13 ` Arnaldo Carvalho de Melo
2019-01-22 14:31 ` Arnaldo Carvalho de Melo
0 siblings, 1 reply; 33+ messages in thread
From: Arnaldo Carvalho de Melo @ 2019-01-22 14:13 UTC (permalink / raw)
To: Song Liu; +Cc: linux-kernel, netdev, peterz, ast, daniel, kernel-team
Em Fri, Jan 18, 2019 at 11:46:55AM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Thu, Jan 17, 2019 at 08:15:19AM -0800, Song Liu escreveu:
> > This patch synthesize PERF_RECORD_KSYMBOL and PERF_RECORD_BPF_EVENT for
> > BPF programs loaded before perf-record. This is achieved by gathering
> > information about all BPF programs via sys_bpf.
>
> Ditto
This is breaking 'perf sched', see below, the fix seems trivial:
[root@quaco ~]# perf sched record -a sleep 2
[ perf record: Woken up 1 times to write data ]
0x5b60 [0x138]: failed to process type: 17
[ perf record: Captured and wrote 1.539 MB perf.data ]
[root@quaco ~]# perf sched lat
0x5b60 [0x138]: failed to process type: 17
Failed to process events, error -22
[root@quaco ~]#
[acme@quaco perf]$ git bisect good
7b612e291a5affb12b9d0b87332c71bcbe9c5db4 is the first bad commit
commit 7b612e291a5affb12b9d0b87332c71bcbe9c5db4
Author: Song Liu <songliubraving@fb.com>
Date: Thu Jan 17 08:15:19 2019 -0800
perf tools: Synthesize PERF_RECORD_* for loaded BPF programs
This patch synthesize PERF_RECORD_KSYMBOL and PERF_RECORD_BPF_EVENT for
BPF programs loaded before perf-record. This is achieved by gathering
information about all BPF programs via sys_bpf.
Committer notes:
Fix the build on some older systems such as amazonlinux:1 where it was
breaking with:
util/bpf-event.c: In function 'perf_event__synthesize_one_bpf_prog':
util/bpf-event.c:52:9: error: missing initializer for field 'type' of 'struct bpf_prog_info' [-Werror=missing-field-initializers]
struct bpf_prog_info info = {};
^
In file included from /git/linux/tools/lib/bpf/bpf.h:26:0,
from util/bpf-event.c:3:
/git/linux/tools/include/uapi/linux/bpf.h:2699:8: note: 'type' declared here
__u32 type;
^
cc1: all warnings being treated as errors
Further fix on a centos:6 system:
cc1: warnings being treated as errors
util/bpf-event.c: In function 'perf_event__synthesize_one_bpf_prog':
util/bpf-event.c:50: error: 'func_info_rec_size' may be used uninitialized in this function
The compiler is wrong, but to silence it, initialize that variable to
zero.
One more fix, this time for debian:experimental-x-mips, x-mips64 and
x-mipsel:
util/bpf-event.c: In function 'perf_event__synthesize_one_bpf_prog':
util/bpf-event.c:93:16: error: implicit declaration of function 'calloc' [-Werror=implicit-function-declaration]
func_infos = calloc(sub_prog_cnt, func_info_rec_size);
^~~~~~
util/bpf-event.c:93:16: error: incompatible implicit declaration of built-in function 'calloc' [-Werror]
util/bpf-event.c:93:16: note: include '<stdlib.h>' or provide a declaration of 'calloc'
Add the missing header.
Committer testing:
# perf record --bpf-event sleep 1
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.021 MB perf.data (7 samples) ]
# perf report -D | grep PERF_RECORD_BPF_EVENT | nl
1 0 0x4b10 [0x18]: PERF_RECORD_BPF_EVENT bpf event with type 1, flags 0, id 13
2 0 0x4c60 [0x18]: PERF_RECORD_BPF_EVENT bpf event with type 1, flags 0, id 14
3 0 0x4db0 [0x18]: PERF_RECORD_BPF_EVENT bpf event with type 1, flags 0, id 15
4 0 0x4f00 [0x18]: PERF_RECORD_BPF_EVENT bpf event with type 1, flags 0, id 16
5 0 0x5050 [0x18]: PERF_RECORD_BPF_EVENT bpf event with type 1, flags 0, id 17
6 0 0x51a0 [0x18]: PERF_RECORD_BPF_EVENT bpf event with type 1, flags 0, id 18
7 0 0x52f0 [0x18]: PERF_RECORD_BPF_EVENT bpf event with type 1, flags 0, id 21
8 0 0x5440 [0x18]: PERF_RECORD_BPF_EVENT bpf event with type 1, flags 0, id 22
# bpftool prog
13: cgroup_skb tag 7be49e3934a125ba gpl
loaded_at 2019-01-19T09:09:43-0300 uid 0
xlated 296B jited 229B memlock 4096B map_ids 13,14
14: cgroup_skb tag 2a142ef67aaad174 gpl
loaded_at 2019-01-19T09:09:43-0300 uid 0
xlated 296B jited 229B memlock 4096B map_ids 13,14
15: cgroup_skb tag 7be49e3934a125ba gpl
loaded_at 2019-01-19T09:09:43-0300 uid 0
xlated 296B jited 229B memlock 4096B map_ids 15,16
16: cgroup_skb tag 2a142ef67aaad174 gpl
loaded_at 2019-01-19T09:09:43-0300 uid 0
xlated 296B jited 229B memlock 4096B map_ids 15,16
17: cgroup_skb tag 7be49e3934a125ba gpl
loaded_at 2019-01-19T09:09:44-0300 uid 0
xlated 296B jited 229B memlock 4096B map_ids 17,18
18: cgroup_skb tag 2a142ef67aaad174 gpl
loaded_at 2019-01-19T09:09:44-0300 uid 0
xlated 296B jited 229B memlock 4096B map_ids 17,18
21: cgroup_skb tag 7be49e3934a125ba gpl
loaded_at 2019-01-19T09:09:45-0300 uid 0
xlated 296B jited 229B memlock 4096B map_ids 21,22
22: cgroup_skb tag 2a142ef67aaad174 gpl
loaded_at 2019-01-19T09:09:45-0300 uid 0
xlated 296B jited 229B memlock 4096B map_ids 21,22
#
# perf report -D | grep -B22 PERF_RECORD_KSYMBOL
. ... raw event: size 312 bytes
. 0000: 11 00 00 00 00 00 38 01 ff 44 06 c0 ff ff ff ff ......8..D......
. 0010: e5 00 00 00 01 00 00 00 62 70 66 5f 70 72 6f 67 ........bpf_prog
. 0020: 5f 37 62 65 34 39 65 33 39 33 34 61 31 32 35 62 _7be49e3934a125b
. 0030: 61 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 a...............
<SNIP zeroes>
. 0110: 00 00 00 00 00 00 00 00 21 00 00 00 00 00 00 00 ........!.......
. 0120: 7b e4 9e 39 34 a1 25 ba 00 00 00 00 00 00 00 00 {..94.%.........
. 0130: 00 00 00 00 00 00 00 00 ........
0 0x49d8 [0x138]: PERF_RECORD_KSYMBOL ksymbol event with addr ffffffffc00644ff len 229 type 1 flags 0x0 name bpf_prog_7be49e3934a125ba
--
. ... raw event: size 312 bytes
. 0000: 11 00 00 00 00 00 38 01 48 6d 06 c0 ff ff ff ff ......8.Hm......
. 0010: e5 00 00 00 01 00 00 00 62 70 66 5f 70 72 6f 67 ........bpf_prog
. 0020: 5f 32 61 31 34 32 65 66 36 37 61 61 61 64 31 37 _2a142ef67aaad17
. 0030: 34 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4...............
<SNIP zeroes>
. 0110: 00 00 00 00 00 00 00 00 21 00 00 00 00 00 00 00 ........!.......
. 0120: 2a 14 2e f6 7a aa d1 74 00 00 00 00 00 00 00 00 *...z..t........
. 0130: 00 00 00 00 00 00 00 00 ........
0 0x4b28 [0x138]: PERF_RECORD_KSYMBOL ksymbol event with addr ffffffffc0066d48 len 229 type 1 flags 0x0 name bpf_prog_2a142ef67aaad174
--
. ... raw event: size 312 bytes
. 0000: 11 00 00 00 00 00 38 01 04 cf 03 c0 ff ff ff ff ......8.........
. 0010: e5 00 00 00 01 00 00 00 62 70 66 5f 70 72 6f 67 ........bpf_prog
. 0020: 5f 37 62 65 34 39 65 33 39 33 34 61 31 32 35 62 _7be49e3934a125b
. 0030: 61 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 a...............
<SNIP zeroes>
. 0110: 00 00 00 00 00 00 00 00 21 00 00 00 00 00 00 00 ........!.......
. 0120: 7b e4 9e 39 34 a1 25 ba 00 00 00 00 00 00 00 00 {..94.%.........
. 0130: 00 00 00 00 00 00 00 00 ........
0 0x4c78 [0x138]: PERF_RECORD_KSYMBOL ksymbol event with addr ffffffffc003cf04 len 229 type 1 flags 0x0 name bpf_prog_7be49e3934a125ba
--
. ... raw event: size 312 bytes
. 0000: 11 00 00 00 00 00 38 01 96 28 04 c0 ff ff ff ff ......8..(......
. 0010: e5 00 00 00 01 00 00 00 62 70 66 5f 70 72 6f 67 ........bpf_prog
. 0020: 5f 32 61 31 34 32 65 66 36 37 61 61 61 64 31 37 _2a142ef67aaad17
. 0030: 34 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4...............
<SNIP zeroes>
. 0110: 00 00 00 00 00 00 00 00 21 00 00 00 00 00 00 00 ........!.......
. 0120: 2a 14 2e f6 7a aa d1 74 00 00 00 00 00 00 00 00 *...z..t........
. 0130: 00 00 00 00 00 00 00 00 ........
0 0x4dc8 [0x138]: PERF_RECORD_KSYMBOL ksymbol event with addr ffffffffc0042896 len 229 type 1 flags 0x0 name bpf_prog_2a142ef67aaad174
--
. ... raw event: size 312 bytes
. 0000: 11 00 00 00 00 00 38 01 05 13 17 c0 ff ff ff ff ......8.........
. 0010: e5 00 00 00 01 00 00 00 62 70 66 5f 70 72 6f 67 ........bpf_prog
. 0020: 5f 37 62 65 34 39 65 33 39 33 34 61 31 32 35 62 _7be49e3934a125b
. 0030: 61 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 a...............
<SNIP zeroes>
. 0110: 00 00 00 00 00 00 00 00 21 00 00 00 00 00 00 00 ........!.......
. 0120: 7b e4 9e 39 34 a1 25 ba 00 00 00 00 00 00 00 00 {..94.%.........
. 0130: 00 00 00 00 00 00 00 00 ........
0 0x4f18 [0x138]: PERF_RECORD_KSYMBOL ksymbol event with addr ffffffffc0171305 len 229 type 1 flags 0x0 name bpf_prog_7be49e3934a125ba
--
. ... raw event: size 312 bytes
. 0000: 11 00 00 00 00 00 38 01 0a 8c 23 c0 ff ff ff ff ......8...#.....
. 0010: e5 00 00 00 01 00 00 00 62 70 66 5f 70 72 6f 67 ........bpf_prog
. 0020: 5f 32 61 31 34 32 65 66 36 37 61 61 61 64 31 37 _2a142ef67aaad17
. 0030: 34 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4...............
<SNIP zeroes>
. 0110: 00 00 00 00 00 00 00 00 21 00 00 00 00 00 00 00 ........!.......
. 0120: 2a 14 2e f6 7a aa d1 74 00 00 00 00 00 00 00 00 *...z..t........
. 0130: 00 00 00 00 00 00 00 00 ........
0 0x5068 [0x138]: PERF_RECORD_KSYMBOL ksymbol event with addr ffffffffc0238c0a len 229 type 1 flags 0x0 name bpf_prog_2a142ef67aaad174
--
. ... raw event: size 312 bytes
. 0000: 11 00 00 00 00 00 38 01 2a a5 a4 c0 ff ff ff ff ......8.*.......
. 0010: e5 00 00 00 01 00 00 00 62 70 66 5f 70 72 6f 67 ........bpf_prog
. 0020: 5f 37 62 65 34 39 65 33 39 33 34 61 31 32 35 62 _7be49e3934a125b
. 0030: 61 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 a...............
<SNIP zeroes>
. 0110: 00 00 00 00 00 00 00 00 21 00 00 00 00 00 00 00 ........!.......
. 0120: 7b e4 9e 39 34 a1 25 ba 00 00 00 00 00 00 00 00 {..94.%.........
. 0130: 00 00 00 00 00 00 00 00 ........
0 0x51b8 [0x138]: PERF_RECORD_KSYMBOL ksymbol event with addr ffffffffc0a4a52a len 229 type 1 flags 0x0 name bpf_prog_7be49e3934a125ba
--
. ... raw event: size 312 bytes
. 0000: 11 00 00 00 00 00 38 01 9b c9 a4 c0 ff ff ff ff ......8.........
. 0010: e5 00 00 00 01 00 00 00 62 70 66 5f 70 72 6f 67 ........bpf_prog
. 0020: 5f 32 61 31 34 32 65 66 36 37 61 61 61 64 31 37 _2a142ef67aaad17
. 0030: 34 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4...............
<SNIP zeroes>
. 0110: 00 00 00 00 00 00 00 00 21 00 00 00 00 00 00 00 ........!.......
. 0120: 2a 14 2e f6 7a aa d1 74 00 00 00 00 00 00 00 00 *...z..t........
. 0130: 00 00 00 00 00 00 00 00 ........
0 0x5308 [0x138]: PERF_RECORD_KSYMBOL ksymbol event with addr ffffffffc0a4c99b len 229 type 1 flags 0x0 name bpf_prog_2a142ef67aaad174
Signed-off-by: Song Liu <songliubraving@fb.com>
Reviewed-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: kernel-team@fb.com
Cc: netdev@vger.kernel.org
Link: http://lkml.kernel.org/r/20190117161521.1341602-8-songliubraving@fb.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
:040000 040000 811377248529490fc3977be729bd1ac6ab515920 3f1cc9a3e8c92d0d5a23a21c33286b7cdf758534 M tools
[acme@quaco perf]$
^ permalink raw reply [flat|nested] 33+ messages in thread* Re: [PATCH v11 perf, bpf-next 7/9] perf tools: synthesize PERF_RECORD_* for loaded BPF programs
2019-01-22 14:13 ` Arnaldo Carvalho de Melo
@ 2019-01-22 14:31 ` Arnaldo Carvalho de Melo
2019-01-22 14:48 ` Arnaldo Carvalho de Melo
2019-01-22 14:51 ` Jiri Olsa
0 siblings, 2 replies; 33+ messages in thread
From: Arnaldo Carvalho de Melo @ 2019-01-22 14:31 UTC (permalink / raw)
To: Song Liu, Jiri Olsa, Namhyung Kim
Cc: linux-kernel, netdev, peterz, ast, daniel, kernel-team
Em Tue, Jan 22, 2019 at 12:13:20PM -0200, Arnaldo Carvalho de Melo escreveu:
> Em Fri, Jan 18, 2019 at 11:46:55AM -0300, Arnaldo Carvalho de Melo escreveu:
> > Em Thu, Jan 17, 2019 at 08:15:19AM -0800, Song Liu escreveu:
> > > This patch synthesize PERF_RECORD_KSYMBOL and PERF_RECORD_BPF_EVENT for
> > > BPF programs loaded before perf-record. This is achieved by gathering
> > > information about all BPF programs via sys_bpf.
> >
> > Ditto
>
> This is breaking 'perf sched', see below, the fix seems trivial:
>
> [root@quaco ~]# perf sched record -a sleep 2
> [ perf record: Woken up 1 times to write data ]
> 0x5b60 [0x138]: failed to process type: 17
> [ perf record: Captured and wrote 1.539 MB perf.data ]
> [root@quaco ~]# perf sched lat
> 0x5b60 [0x138]: failed to process type: 17
> Failed to process events, error -22
> [root@quaco ~]#
So:
perf_session__process_event (event->header.type = 17 (PERF_RECORD_KSYMBOL)
if (tool->ordered_events)
ret = perf_evlist__parse_sample_timestamp(evlist, event, ×tamp);
if (ret && ret != -1)
return ret;
So it returns here with -EFAULT, i.e. this is failing:
int perf_evlist__parse_sample_timestamp(struct perf_evlist *evlist,
union perf_event *event,
u64 *timestamp)
{
struct perf_evsel *evsel = perf_evlist__event2evsel(evlist, event);
if (!evsel)
return -EFAULT;
return perf_evsel__parse_sample_timestamp(evsel, event, timestamp);
}
It isn't mapping the event ID it finds back to an evsel.. Jiri, ideas?
This is happening so far only for 'perf sched', perf record with two
events works.
- Arnaldo
> [acme@quaco perf]$ git bisect good
> 7b612e291a5affb12b9d0b87332c71bcbe9c5db4 is the first bad commit
> commit 7b612e291a5affb12b9d0b87332c71bcbe9c5db4
> Author: Song Liu <songliubraving@fb.com>
> Date: Thu Jan 17 08:15:19 2019 -0800
>
> perf tools: Synthesize PERF_RECORD_* for loaded BPF programs
>
> This patch synthesize PERF_RECORD_KSYMBOL and PERF_RECORD_BPF_EVENT for
> BPF programs loaded before perf-record. This is achieved by gathering
> information about all BPF programs via sys_bpf.
>
> Committer notes:
>
> Fix the build on some older systems such as amazonlinux:1 where it was
> breaking with:
>
> util/bpf-event.c: In function 'perf_event__synthesize_one_bpf_prog':
> util/bpf-event.c:52:9: error: missing initializer for field 'type' of 'struct bpf_prog_info' [-Werror=missing-field-initializers]
> struct bpf_prog_info info = {};
> ^
> In file included from /git/linux/tools/lib/bpf/bpf.h:26:0,
> from util/bpf-event.c:3:
> /git/linux/tools/include/uapi/linux/bpf.h:2699:8: note: 'type' declared here
> __u32 type;
> ^
> cc1: all warnings being treated as errors
>
> Further fix on a centos:6 system:
>
> cc1: warnings being treated as errors
> util/bpf-event.c: In function 'perf_event__synthesize_one_bpf_prog':
> util/bpf-event.c:50: error: 'func_info_rec_size' may be used uninitialized in this function
>
> The compiler is wrong, but to silence it, initialize that variable to
> zero.
>
> One more fix, this time for debian:experimental-x-mips, x-mips64 and
> x-mipsel:
>
> util/bpf-event.c: In function 'perf_event__synthesize_one_bpf_prog':
> util/bpf-event.c:93:16: error: implicit declaration of function 'calloc' [-Werror=implicit-function-declaration]
> func_infos = calloc(sub_prog_cnt, func_info_rec_size);
> ^~~~~~
> util/bpf-event.c:93:16: error: incompatible implicit declaration of built-in function 'calloc' [-Werror]
> util/bpf-event.c:93:16: note: include '<stdlib.h>' or provide a declaration of 'calloc'
>
> Add the missing header.
>
> Committer testing:
>
> # perf record --bpf-event sleep 1
> [ perf record: Woken up 1 times to write data ]
> [ perf record: Captured and wrote 0.021 MB perf.data (7 samples) ]
> # perf report -D | grep PERF_RECORD_BPF_EVENT | nl
> 1 0 0x4b10 [0x18]: PERF_RECORD_BPF_EVENT bpf event with type 1, flags 0, id 13
> 2 0 0x4c60 [0x18]: PERF_RECORD_BPF_EVENT bpf event with type 1, flags 0, id 14
> 3 0 0x4db0 [0x18]: PERF_RECORD_BPF_EVENT bpf event with type 1, flags 0, id 15
> 4 0 0x4f00 [0x18]: PERF_RECORD_BPF_EVENT bpf event with type 1, flags 0, id 16
> 5 0 0x5050 [0x18]: PERF_RECORD_BPF_EVENT bpf event with type 1, flags 0, id 17
> 6 0 0x51a0 [0x18]: PERF_RECORD_BPF_EVENT bpf event with type 1, flags 0, id 18
> 7 0 0x52f0 [0x18]: PERF_RECORD_BPF_EVENT bpf event with type 1, flags 0, id 21
> 8 0 0x5440 [0x18]: PERF_RECORD_BPF_EVENT bpf event with type 1, flags 0, id 22
> # bpftool prog
> 13: cgroup_skb tag 7be49e3934a125ba gpl
> loaded_at 2019-01-19T09:09:43-0300 uid 0
> xlated 296B jited 229B memlock 4096B map_ids 13,14
> 14: cgroup_skb tag 2a142ef67aaad174 gpl
> loaded_at 2019-01-19T09:09:43-0300 uid 0
> xlated 296B jited 229B memlock 4096B map_ids 13,14
> 15: cgroup_skb tag 7be49e3934a125ba gpl
> loaded_at 2019-01-19T09:09:43-0300 uid 0
> xlated 296B jited 229B memlock 4096B map_ids 15,16
> 16: cgroup_skb tag 2a142ef67aaad174 gpl
> loaded_at 2019-01-19T09:09:43-0300 uid 0
> xlated 296B jited 229B memlock 4096B map_ids 15,16
> 17: cgroup_skb tag 7be49e3934a125ba gpl
> loaded_at 2019-01-19T09:09:44-0300 uid 0
> xlated 296B jited 229B memlock 4096B map_ids 17,18
> 18: cgroup_skb tag 2a142ef67aaad174 gpl
> loaded_at 2019-01-19T09:09:44-0300 uid 0
> xlated 296B jited 229B memlock 4096B map_ids 17,18
> 21: cgroup_skb tag 7be49e3934a125ba gpl
> loaded_at 2019-01-19T09:09:45-0300 uid 0
> xlated 296B jited 229B memlock 4096B map_ids 21,22
> 22: cgroup_skb tag 2a142ef67aaad174 gpl
> loaded_at 2019-01-19T09:09:45-0300 uid 0
> xlated 296B jited 229B memlock 4096B map_ids 21,22
> #
>
> # perf report -D | grep -B22 PERF_RECORD_KSYMBOL
> . ... raw event: size 312 bytes
> . 0000: 11 00 00 00 00 00 38 01 ff 44 06 c0 ff ff ff ff ......8..D......
> . 0010: e5 00 00 00 01 00 00 00 62 70 66 5f 70 72 6f 67 ........bpf_prog
> . 0020: 5f 37 62 65 34 39 65 33 39 33 34 61 31 32 35 62 _7be49e3934a125b
> . 0030: 61 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 a...............
> <SNIP zeroes>
> . 0110: 00 00 00 00 00 00 00 00 21 00 00 00 00 00 00 00 ........!.......
> . 0120: 7b e4 9e 39 34 a1 25 ba 00 00 00 00 00 00 00 00 {..94.%.........
> . 0130: 00 00 00 00 00 00 00 00 ........
>
> 0 0x49d8 [0x138]: PERF_RECORD_KSYMBOL ksymbol event with addr ffffffffc00644ff len 229 type 1 flags 0x0 name bpf_prog_7be49e3934a125ba
> --
> . ... raw event: size 312 bytes
> . 0000: 11 00 00 00 00 00 38 01 48 6d 06 c0 ff ff ff ff ......8.Hm......
> . 0010: e5 00 00 00 01 00 00 00 62 70 66 5f 70 72 6f 67 ........bpf_prog
> . 0020: 5f 32 61 31 34 32 65 66 36 37 61 61 61 64 31 37 _2a142ef67aaad17
> . 0030: 34 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4...............
> <SNIP zeroes>
> . 0110: 00 00 00 00 00 00 00 00 21 00 00 00 00 00 00 00 ........!.......
> . 0120: 2a 14 2e f6 7a aa d1 74 00 00 00 00 00 00 00 00 *...z..t........
> . 0130: 00 00 00 00 00 00 00 00 ........
>
> 0 0x4b28 [0x138]: PERF_RECORD_KSYMBOL ksymbol event with addr ffffffffc0066d48 len 229 type 1 flags 0x0 name bpf_prog_2a142ef67aaad174
> --
> . ... raw event: size 312 bytes
> . 0000: 11 00 00 00 00 00 38 01 04 cf 03 c0 ff ff ff ff ......8.........
> . 0010: e5 00 00 00 01 00 00 00 62 70 66 5f 70 72 6f 67 ........bpf_prog
> . 0020: 5f 37 62 65 34 39 65 33 39 33 34 61 31 32 35 62 _7be49e3934a125b
> . 0030: 61 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 a...............
> <SNIP zeroes>
> . 0110: 00 00 00 00 00 00 00 00 21 00 00 00 00 00 00 00 ........!.......
> . 0120: 7b e4 9e 39 34 a1 25 ba 00 00 00 00 00 00 00 00 {..94.%.........
> . 0130: 00 00 00 00 00 00 00 00 ........
>
> 0 0x4c78 [0x138]: PERF_RECORD_KSYMBOL ksymbol event with addr ffffffffc003cf04 len 229 type 1 flags 0x0 name bpf_prog_7be49e3934a125ba
> --
> . ... raw event: size 312 bytes
> . 0000: 11 00 00 00 00 00 38 01 96 28 04 c0 ff ff ff ff ......8..(......
> . 0010: e5 00 00 00 01 00 00 00 62 70 66 5f 70 72 6f 67 ........bpf_prog
> . 0020: 5f 32 61 31 34 32 65 66 36 37 61 61 61 64 31 37 _2a142ef67aaad17
> . 0030: 34 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4...............
> <SNIP zeroes>
> . 0110: 00 00 00 00 00 00 00 00 21 00 00 00 00 00 00 00 ........!.......
> . 0120: 2a 14 2e f6 7a aa d1 74 00 00 00 00 00 00 00 00 *...z..t........
> . 0130: 00 00 00 00 00 00 00 00 ........
>
> 0 0x4dc8 [0x138]: PERF_RECORD_KSYMBOL ksymbol event with addr ffffffffc0042896 len 229 type 1 flags 0x0 name bpf_prog_2a142ef67aaad174
> --
> . ... raw event: size 312 bytes
> . 0000: 11 00 00 00 00 00 38 01 05 13 17 c0 ff ff ff ff ......8.........
> . 0010: e5 00 00 00 01 00 00 00 62 70 66 5f 70 72 6f 67 ........bpf_prog
> . 0020: 5f 37 62 65 34 39 65 33 39 33 34 61 31 32 35 62 _7be49e3934a125b
> . 0030: 61 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 a...............
> <SNIP zeroes>
> . 0110: 00 00 00 00 00 00 00 00 21 00 00 00 00 00 00 00 ........!.......
> . 0120: 7b e4 9e 39 34 a1 25 ba 00 00 00 00 00 00 00 00 {..94.%.........
> . 0130: 00 00 00 00 00 00 00 00 ........
>
> 0 0x4f18 [0x138]: PERF_RECORD_KSYMBOL ksymbol event with addr ffffffffc0171305 len 229 type 1 flags 0x0 name bpf_prog_7be49e3934a125ba
> --
> . ... raw event: size 312 bytes
> . 0000: 11 00 00 00 00 00 38 01 0a 8c 23 c0 ff ff ff ff ......8...#.....
> . 0010: e5 00 00 00 01 00 00 00 62 70 66 5f 70 72 6f 67 ........bpf_prog
> . 0020: 5f 32 61 31 34 32 65 66 36 37 61 61 61 64 31 37 _2a142ef67aaad17
> . 0030: 34 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4...............
> <SNIP zeroes>
> . 0110: 00 00 00 00 00 00 00 00 21 00 00 00 00 00 00 00 ........!.......
> . 0120: 2a 14 2e f6 7a aa d1 74 00 00 00 00 00 00 00 00 *...z..t........
> . 0130: 00 00 00 00 00 00 00 00 ........
>
> 0 0x5068 [0x138]: PERF_RECORD_KSYMBOL ksymbol event with addr ffffffffc0238c0a len 229 type 1 flags 0x0 name bpf_prog_2a142ef67aaad174
> --
> . ... raw event: size 312 bytes
> . 0000: 11 00 00 00 00 00 38 01 2a a5 a4 c0 ff ff ff ff ......8.*.......
> . 0010: e5 00 00 00 01 00 00 00 62 70 66 5f 70 72 6f 67 ........bpf_prog
> . 0020: 5f 37 62 65 34 39 65 33 39 33 34 61 31 32 35 62 _7be49e3934a125b
> . 0030: 61 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 a...............
> <SNIP zeroes>
> . 0110: 00 00 00 00 00 00 00 00 21 00 00 00 00 00 00 00 ........!.......
> . 0120: 7b e4 9e 39 34 a1 25 ba 00 00 00 00 00 00 00 00 {..94.%.........
> . 0130: 00 00 00 00 00 00 00 00 ........
>
> 0 0x51b8 [0x138]: PERF_RECORD_KSYMBOL ksymbol event with addr ffffffffc0a4a52a len 229 type 1 flags 0x0 name bpf_prog_7be49e3934a125ba
> --
> . ... raw event: size 312 bytes
> . 0000: 11 00 00 00 00 00 38 01 9b c9 a4 c0 ff ff ff ff ......8.........
> . 0010: e5 00 00 00 01 00 00 00 62 70 66 5f 70 72 6f 67 ........bpf_prog
> . 0020: 5f 32 61 31 34 32 65 66 36 37 61 61 61 64 31 37 _2a142ef67aaad17
> . 0030: 34 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4...............
> <SNIP zeroes>
> . 0110: 00 00 00 00 00 00 00 00 21 00 00 00 00 00 00 00 ........!.......
> . 0120: 2a 14 2e f6 7a aa d1 74 00 00 00 00 00 00 00 00 *...z..t........
> . 0130: 00 00 00 00 00 00 00 00 ........
>
> 0 0x5308 [0x138]: PERF_RECORD_KSYMBOL ksymbol event with addr ffffffffc0a4c99b len 229 type 1 flags 0x0 name bpf_prog_2a142ef67aaad174
>
> Signed-off-by: Song Liu <songliubraving@fb.com>
> Reviewed-by: Arnaldo Carvalho de Melo <acme@redhat.com>
> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
> Cc: Alexei Starovoitov <ast@kernel.org>
> Cc: Daniel Borkmann <daniel@iogearbox.net>
> Cc: Peter Zijlstra <peterz@infradead.org>
> Cc: kernel-team@fb.com
> Cc: netdev@vger.kernel.org
> Link: http://lkml.kernel.org/r/20190117161521.1341602-8-songliubraving@fb.com
> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
>
> :040000 040000 811377248529490fc3977be729bd1ac6ab515920 3f1cc9a3e8c92d0d5a23a21c33286b7cdf758534 M tools
> [acme@quaco perf]$
--
- Arnaldo
^ permalink raw reply [flat|nested] 33+ messages in thread* Re: [PATCH v11 perf, bpf-next 7/9] perf tools: synthesize PERF_RECORD_* for loaded BPF programs
2019-01-22 14:31 ` Arnaldo Carvalho de Melo
@ 2019-01-22 14:48 ` Arnaldo Carvalho de Melo
2019-01-22 14:51 ` Jiri Olsa
1 sibling, 0 replies; 33+ messages in thread
From: Arnaldo Carvalho de Melo @ 2019-01-22 14:48 UTC (permalink / raw)
To: Song Liu, Jiri Olsa, Namhyung Kim
Cc: linux-kernel, netdev, peterz, ast, daniel, kernel-team
Em Tue, Jan 22, 2019 at 12:31:17PM -0200, Arnaldo Carvalho de Melo escreveu:
> Em Tue, Jan 22, 2019 at 12:13:20PM -0200, Arnaldo Carvalho de Melo escreveu:
> > Em Fri, Jan 18, 2019 at 11:46:55AM -0300, Arnaldo Carvalho de Melo escreveu:
> > > Em Thu, Jan 17, 2019 at 08:15:19AM -0800, Song Liu escreveu:
> > > > This patch synthesize PERF_RECORD_KSYMBOL and PERF_RECORD_BPF_EVENT for
> > > > BPF programs loaded before perf-record. This is achieved by gathering
> > > > information about all BPF programs via sys_bpf.
> > >
> > > Ditto
> >
> > This is breaking 'perf sched', see below, the fix seems trivial:
> >
> > [root@quaco ~]# perf sched record -a sleep 2
> > [ perf record: Woken up 1 times to write data ]
> > 0x5b60 [0x138]: failed to process type: 17
> > [ perf record: Captured and wrote 1.539 MB perf.data ]
> > [root@quaco ~]# perf sched lat
> > 0x5b60 [0x138]: failed to process type: 17
> > Failed to process events, error -22
> > [root@quaco ~]#
>
> So:
>
> perf_session__process_event (event->header.type = 17 (PERF_RECORD_KSYMBOL)
> if (tool->ordered_events)
> ret = perf_evlist__parse_sample_timestamp(evlist, event, ×tamp);
> if (ret && ret != -1)
> return ret;
>
> So it returns here with -EFAULT, i.e. this is failing:
>
> int perf_evlist__parse_sample_timestamp(struct perf_evlist *evlist,
> union perf_event *event,
> u64 *timestamp)
> {
> struct perf_evsel *evsel = perf_evlist__event2evsel(evlist, event);
>
> if (!evsel)
> return -EFAULT;
> return perf_evsel__parse_sample_timestamp(evsel, event, timestamp);
> }
>
> It isn't mapping the event ID it finds back to an evsel.. Jiri, ideas?
>
> This is happening so far only for 'perf sched', perf record with two
> events works.
So it fails for tracepoints with plain 'perf record':
[root@quaco tmp]# perf record -e sched:sched* sleep 1
[ perf record: Woken up 29 times to write data ]
0x6658 [0x138]: failed to process type: 17
[ perf record: Captured and wrote 0.029 MB perf.data ]
[root@quaco tmp]# perf script
0x6658 [0x138]: failed to process type: 17
[root@quaco tmp]#
[ perf record: Woken up 1 times to write data ]
Breakpoint 1, reader__process_events (rd=0x7ffffffe4160, session=0xab66a0, prog=0x7ffffffe4180) at util/session.c:1911
1911 pr_err("%#" PRIx64 " [%#x]: failed to process type: %d\n",
Missing separate debuginfos, use: dnf debuginfo-install bzip2-libs-1.0.6-28.fc29.x86_64 elfutils-libelf-0.174-5.fc29.x86_64 elfutils-libs-0.174-5.fc29.x86_64 glib2-2.58.2-1.fc29.x86_64 libbabeltrace-1.5.6-1.fc29.x86_64 libunwind-1.2.1-6.fc29.x86_64 libuuid-2.32.1-1.fc29.x86_64 libxcrypt-4.4.2-3.fc29.x86_64 numactl-libs-2.0.12-1.fc29.x86_64 openssl-libs-1.1.1a-1.fc29.x86_64 pcre-8.42-6.fc29.x86_64 perl-libs-5.28.1-427.fc29.x86_64 popt-1.16-15.fc29.x86_64 python2-libs-2.7.15-11.fc29.x86_64 slang-2.3.2-4.fc29.x86_64 xz-libs-5.2.4-3.fc29.x86_64
(gdb) bt
#0 reader__process_events (rd=0x7ffffffe4160, session=0xab66a0, prog=0x7ffffffe4180) at util/session.c:1911
#1 0x0000000000540deb in __perf_session__process_events (session=0xab66a0) at util/session.c:1955
#2 0x0000000000540f1c in perf_session__process_events (session=0xab66a0) at util/session.c:1988
#3 0x0000000000445feb in process_buildids (rec=0x9202a0 <record>) at builtin-record.c:689
#4 0x0000000000446597 in record__finish_output (rec=0x9202a0 <record>) at builtin-record.c:846
#5 0x0000000000447b8c in __cmd_record (rec=0x9202a0 <record>, argc=2, argv=0xab4720) at builtin-record.c:1429
#6 0x0000000000448d64 in cmd_record (argc=2, argv=0xab4720) at builtin-record.c:2153
#7 0x00000000004406dd in __cmd_record (argc=3, argv=0x7fffffffdb30) at builtin-sched.c:3339
#8 0x00000000004411ff in cmd_sched (argc=3, argv=0x7fffffffdb30) at builtin-sched.c:3486
#9 0x00000000004d46e3 in run_builtin (p=0x932c50 <commands+432>, argc=4, argv=0x7fffffffdb30) at perf.c:302
#10 0x00000000004d4950 in handle_internal_command (argc=4, argv=0x7fffffffdb30) at perf.c:354
#11 0x00000000004d4a9f in run_argv (argcp=0x7fffffffd98c, argv=0x7fffffffd980) at perf.c:398
#12 0x00000000004d4e0b in main (argc=4, argv=0x7fffffffdb30) at perf.c:520
(gdb)
[root@quaco tmp]# perf c2c record
^C[ perf record: Woken up 1 times to write data ]
0x5698 [0x138]: failed to process type: 17
[ perf record: Captured and wrote 7.110 MB perf.data ]
[root@quaco tmp]# perf kmem record
^C[ perf record: Woken up 1 times to write data ]
0x5998 [0x138]: failed to process type: 17
[ perf record: Captured and wrote 1.470 MB perf.data ]
[root@quaco tmp]#
^ permalink raw reply [flat|nested] 33+ messages in thread* Re: [PATCH v11 perf, bpf-next 7/9] perf tools: synthesize PERF_RECORD_* for loaded BPF programs
2019-01-22 14:31 ` Arnaldo Carvalho de Melo
2019-01-22 14:48 ` Arnaldo Carvalho de Melo
@ 2019-01-22 14:51 ` Jiri Olsa
2019-01-22 14:58 ` Arnaldo Carvalho de Melo
1 sibling, 1 reply; 33+ messages in thread
From: Jiri Olsa @ 2019-01-22 14:51 UTC (permalink / raw)
To: Arnaldo Carvalho de Melo
Cc: Song Liu, Jiri Olsa, Namhyung Kim, linux-kernel, netdev, peterz,
ast, daniel, kernel-team
On Tue, Jan 22, 2019 at 12:31:17PM -0200, Arnaldo Carvalho de Melo wrote:
> Em Tue, Jan 22, 2019 at 12:13:20PM -0200, Arnaldo Carvalho de Melo escreveu:
> > Em Fri, Jan 18, 2019 at 11:46:55AM -0300, Arnaldo Carvalho de Melo escreveu:
> > > Em Thu, Jan 17, 2019 at 08:15:19AM -0800, Song Liu escreveu:
> > > > This patch synthesize PERF_RECORD_KSYMBOL and PERF_RECORD_BPF_EVENT for
> > > > BPF programs loaded before perf-record. This is achieved by gathering
> > > > information about all BPF programs via sys_bpf.
> > >
> > > Ditto
> >
> > This is breaking 'perf sched', see below, the fix seems trivial:
> >
> > [root@quaco ~]# perf sched record -a sleep 2
> > [ perf record: Woken up 1 times to write data ]
> > 0x5b60 [0x138]: failed to process type: 17
> > [ perf record: Captured and wrote 1.539 MB perf.data ]
> > [root@quaco ~]# perf sched lat
> > 0x5b60 [0x138]: failed to process type: 17
> > Failed to process events, error -22
> > [root@quaco ~]#
>
> So:
>
> perf_session__process_event (event->header.type = 17 (PERF_RECORD_KSYMBOL)
> if (tool->ordered_events)
> ret = perf_evlist__parse_sample_timestamp(evlist, event, ×tamp);
> if (ret && ret != -1)
> return ret;
>
> So it returns here with -EFAULT, i.e. this is failing:
>
> int perf_evlist__parse_sample_timestamp(struct perf_evlist *evlist,
> union perf_event *event,
> u64 *timestamp)
> {
> struct perf_evsel *evsel = perf_evlist__event2evsel(evlist, event);
>
> if (!evsel)
> return -EFAULT;
> return perf_evsel__parse_sample_timestamp(evsel, event, timestamp);
> }
>
> It isn't mapping the event ID it finds back to an evsel.. Jiri, ideas?
>
> This is happening so far only for 'perf sched', perf record with two
> events works.
I saw also perf mem failing because of this.. will check
jirka
^ permalink raw reply [flat|nested] 33+ messages in thread* Re: [PATCH v11 perf, bpf-next 7/9] perf tools: synthesize PERF_RECORD_* for loaded BPF programs
2019-01-22 14:51 ` Jiri Olsa
@ 2019-01-22 14:58 ` Arnaldo Carvalho de Melo
2019-01-22 15:21 ` Jiri Olsa
0 siblings, 1 reply; 33+ messages in thread
From: Arnaldo Carvalho de Melo @ 2019-01-22 14:58 UTC (permalink / raw)
To: Jiri Olsa
Cc: Song Liu, Jiri Olsa, Namhyung Kim, linux-kernel, netdev, peterz,
ast, daniel, kernel-team
Em Tue, Jan 22, 2019 at 03:51:19PM +0100, Jiri Olsa escreveu:
> On Tue, Jan 22, 2019 at 12:31:17PM -0200, Arnaldo Carvalho de Melo wrote:
> > Em Tue, Jan 22, 2019 at 12:13:20PM -0200, Arnaldo Carvalho de Melo escreveu:
> > > Em Fri, Jan 18, 2019 at 11:46:55AM -0300, Arnaldo Carvalho de Melo escreveu:
> > > > Em Thu, Jan 17, 2019 at 08:15:19AM -0800, Song Liu escreveu:
> > > > > This patch synthesize PERF_RECORD_KSYMBOL and PERF_RECORD_BPF_EVENT for
> > > > > BPF programs loaded before perf-record. This is achieved by gathering
> > > > > information about all BPF programs via sys_bpf.
> > > >
> > > > Ditto
> > >
> > > This is breaking 'perf sched', see below, the fix seems trivial:
> > >
> > > [root@quaco ~]# perf sched record -a sleep 2
> > > [ perf record: Woken up 1 times to write data ]
> > > 0x5b60 [0x138]: failed to process type: 17
> > > [ perf record: Captured and wrote 1.539 MB perf.data ]
> > > [root@quaco ~]# perf sched lat
> > > 0x5b60 [0x138]: failed to process type: 17
> > > Failed to process events, error -22
> > > [root@quaco ~]#
> >
> > So:
> >
> > perf_session__process_event (event->header.type = 17 (PERF_RECORD_KSYMBOL)
> > if (tool->ordered_events)
> > ret = perf_evlist__parse_sample_timestamp(evlist, event, ×tamp);
> > if (ret && ret != -1)
> > return ret;
> >
> > So it returns here with -EFAULT, i.e. this is failing:
> >
> > int perf_evlist__parse_sample_timestamp(struct perf_evlist *evlist,
> > union perf_event *event,
> > u64 *timestamp)
> > {
> > struct perf_evsel *evsel = perf_evlist__event2evsel(evlist, event);
> >
> > if (!evsel)
> > return -EFAULT;
> > return perf_evsel__parse_sample_timestamp(evsel, event, timestamp);
> > }
> >
> > It isn't mapping the event ID it finds back to an evsel.. Jiri, ideas?
> >
> > This is happening so far only for 'perf sched', perf record with two
> > events works.
>
> I saw also perf mem failing because of this.. will check
Right, seems something with the synthesizing of existing bpf progs,
which always there are some nowadays, for instance, on this fedora29
system:
[root@quaco tmp]# bpftool prog
13: cgroup_skb tag 7be49e3934a125ba gpl
loaded_at 2019-01-21T13:30:27-0200 uid 0
xlated 296B jited 229B memlock 4096B map_ids 13,14
14: cgroup_skb tag 2a142ef67aaad174 gpl
loaded_at 2019-01-21T13:30:27-0200 uid 0
xlated 296B jited 229B memlock 4096B map_ids 13,14
15: cgroup_skb tag 7be49e3934a125ba gpl
loaded_at 2019-01-21T13:30:27-0200 uid 0
xlated 296B jited 229B memlock 4096B map_ids 15,16
16: cgroup_skb tag 2a142ef67aaad174 gpl
loaded_at 2019-01-21T13:30:27-0200 uid 0
xlated 296B jited 229B memlock 4096B map_ids 15,16
17: cgroup_skb tag 7be49e3934a125ba gpl
loaded_at 2019-01-21T13:30:29-0200 uid 0
xlated 296B jited 229B memlock 4096B map_ids 17,18
18: cgroup_skb tag 2a142ef67aaad174 gpl
loaded_at 2019-01-21T13:30:29-0200 uid 0
xlated 296B jited 229B memlock 4096B map_ids 17,18
21: cgroup_skb tag 7be49e3934a125ba gpl
loaded_at 2019-01-21T13:30:29-0200 uid 0
xlated 296B jited 229B memlock 4096B map_ids 21,22
22: cgroup_skb tag 2a142ef67aaad174 gpl
loaded_at 2019-01-21T13:30:29-0200 uid 0
xlated 296B jited 229B memlock 4096B map_ids 21,22
[root@quaco tmp]#
When with a bunch of tracepoints, that is what 'perf mem', 'perf kmem',
'perf sched', etc does, it ends up failing here:
ret = perf_evlist__parse_sample_timestamp(evlist, event, ×tamp);
So it is not passed to
ret = perf_session__queue_event(session, event, timestamp, file_offset);
in perf_session__process_event, this happens right when processing
buildids in 'perf record', and also in 'perf report', so that is
something badly synthesized that hits perf.data for PERF_RECORD_KSYMBOL.
- Arnaldo
^ permalink raw reply [flat|nested] 33+ messages in thread* Re: [PATCH v11 perf, bpf-next 7/9] perf tools: synthesize PERF_RECORD_* for loaded BPF programs
2019-01-22 14:58 ` Arnaldo Carvalho de Melo
@ 2019-01-22 15:21 ` Jiri Olsa
2019-01-22 18:38 ` Song Liu
0 siblings, 1 reply; 33+ messages in thread
From: Jiri Olsa @ 2019-01-22 15:21 UTC (permalink / raw)
To: Arnaldo Carvalho de Melo
Cc: Song Liu, Jiri Olsa, Namhyung Kim, linux-kernel, netdev, peterz,
ast, daniel, kernel-team
On Tue, Jan 22, 2019 at 12:58:05PM -0200, Arnaldo Carvalho de Melo wrote:
> Em Tue, Jan 22, 2019 at 03:51:19PM +0100, Jiri Olsa escreveu:
> > On Tue, Jan 22, 2019 at 12:31:17PM -0200, Arnaldo Carvalho de Melo wrote:
> > > Em Tue, Jan 22, 2019 at 12:13:20PM -0200, Arnaldo Carvalho de Melo escreveu:
> > > > Em Fri, Jan 18, 2019 at 11:46:55AM -0300, Arnaldo Carvalho de Melo escreveu:
> > > > > Em Thu, Jan 17, 2019 at 08:15:19AM -0800, Song Liu escreveu:
> > > > > > This patch synthesize PERF_RECORD_KSYMBOL and PERF_RECORD_BPF_EVENT for
> > > > > > BPF programs loaded before perf-record. This is achieved by gathering
> > > > > > information about all BPF programs via sys_bpf.
> > > > >
> > > > > Ditto
> > > >
> > > > This is breaking 'perf sched', see below, the fix seems trivial:
> > > >
> > > > [root@quaco ~]# perf sched record -a sleep 2
> > > > [ perf record: Woken up 1 times to write data ]
> > > > 0x5b60 [0x138]: failed to process type: 17
> > > > [ perf record: Captured and wrote 1.539 MB perf.data ]
> > > > [root@quaco ~]# perf sched lat
> > > > 0x5b60 [0x138]: failed to process type: 17
> > > > Failed to process events, error -22
> > > > [root@quaco ~]#
> > >
> > > So:
> > >
> > > perf_session__process_event (event->header.type = 17 (PERF_RECORD_KSYMBOL)
> > > if (tool->ordered_events)
> > > ret = perf_evlist__parse_sample_timestamp(evlist, event, ×tamp);
> > > if (ret && ret != -1)
> > > return ret;
> > >
> > > So it returns here with -EFAULT, i.e. this is failing:
> > >
> > > int perf_evlist__parse_sample_timestamp(struct perf_evlist *evlist,
> > > union perf_event *event,
> > > u64 *timestamp)
> > > {
> > > struct perf_evsel *evsel = perf_evlist__event2evsel(evlist, event);
> > >
> > > if (!evsel)
> > > return -EFAULT;
> > > return perf_evsel__parse_sample_timestamp(evsel, event, timestamp);
> > > }
> > >
> > > It isn't mapping the event ID it finds back to an evsel.. Jiri, ideas?
> > >
> > > This is happening so far only for 'perf sched', perf record with two
> > > events works.
> >
> > I saw also perf mem failing because of this.. will check
>
> Right, seems something with the synthesizing of existing bpf progs,
> which always there are some nowadays, for instance, on this fedora29
> system:
>
> [root@quaco tmp]# bpftool prog
> 13: cgroup_skb tag 7be49e3934a125ba gpl
> loaded_at 2019-01-21T13:30:27-0200 uid 0
> xlated 296B jited 229B memlock 4096B map_ids 13,14
> 14: cgroup_skb tag 2a142ef67aaad174 gpl
> loaded_at 2019-01-21T13:30:27-0200 uid 0
> xlated 296B jited 229B memlock 4096B map_ids 13,14
> 15: cgroup_skb tag 7be49e3934a125ba gpl
> loaded_at 2019-01-21T13:30:27-0200 uid 0
> xlated 296B jited 229B memlock 4096B map_ids 15,16
> 16: cgroup_skb tag 2a142ef67aaad174 gpl
> loaded_at 2019-01-21T13:30:27-0200 uid 0
> xlated 296B jited 229B memlock 4096B map_ids 15,16
> 17: cgroup_skb tag 7be49e3934a125ba gpl
> loaded_at 2019-01-21T13:30:29-0200 uid 0
> xlated 296B jited 229B memlock 4096B map_ids 17,18
> 18: cgroup_skb tag 2a142ef67aaad174 gpl
> loaded_at 2019-01-21T13:30:29-0200 uid 0
> xlated 296B jited 229B memlock 4096B map_ids 17,18
> 21: cgroup_skb tag 7be49e3934a125ba gpl
> loaded_at 2019-01-21T13:30:29-0200 uid 0
> xlated 296B jited 229B memlock 4096B map_ids 21,22
> 22: cgroup_skb tag 2a142ef67aaad174 gpl
> loaded_at 2019-01-21T13:30:29-0200 uid 0
> xlated 296B jited 229B memlock 4096B map_ids 21,22
> [root@quaco tmp]#
>
> When with a bunch of tracepoints, that is what 'perf mem', 'perf kmem',
> 'perf sched', etc does, it ends up failing here:
>
> ret = perf_evlist__parse_sample_timestamp(evlist, event, ×tamp);
>
> So it is not passed to
>
> ret = perf_session__queue_event(session, event, timestamp, file_offset);
>
> in perf_session__process_event, this happens right when processing
> buildids in 'perf record', and also in 'perf report', so that is
> something badly synthesized that hits perf.data for PERF_RECORD_KSYMBOL.
it's reproducible with simple:
perf record -e cycles,instructions ls
as you said on irc, it's the machine->id_hdr_size size missing
there's one more glitch, attached patch fixes that for me
you can't use sizeof(struct ksymbol_event), because it includes
the name as well.. which screws the size
but I don't know that code that much.. might be still something
missing
jirka
---
diff --git a/tools/perf/util/bpf-event.c b/tools/perf/util/bpf-event.c
index 01e1dc1bb7fb..d86b61cc635f 100644
--- a/tools/perf/util/bpf-event.c
+++ b/tools/perf/util/bpf-event.c
@@ -7,6 +7,7 @@
#include "bpf-event.h"
#include "debug.h"
#include "symbol.h"
+#include "machine.h"
#define ptr_to_u64(ptr) ((__u64)(unsigned long)(ptr))
@@ -149,7 +150,7 @@ static int perf_event__synthesize_one_bpf_prog(struct perf_tool *tool,
*ksymbol_event = (struct ksymbol_event){
.header = {
.type = PERF_RECORD_KSYMBOL,
- .size = sizeof(struct ksymbol_event),
+ .size = offsetof(struct ksymbol_event, name) + machine->id_hdr_size,
},
.addr = prog_addrs[i],
.len = prog_lens[i],
^ permalink raw reply related [flat|nested] 33+ messages in thread* Re: [PATCH v11 perf, bpf-next 7/9] perf tools: synthesize PERF_RECORD_* for loaded BPF programs
2019-01-22 15:21 ` Jiri Olsa
@ 2019-01-22 18:38 ` Song Liu
2019-01-22 19:15 ` Jiri Olsa
0 siblings, 1 reply; 33+ messages in thread
From: Song Liu @ 2019-01-22 18:38 UTC (permalink / raw)
To: Jiri Olsa
Cc: Arnaldo Carvalho de Melo, Jiri Olsa, Namhyung Kim, linux-kernel,
netdev, peterz, ast, daniel, Kernel Team
> On Jan 22, 2019, at 7:21 AM, Jiri Olsa <jolsa@redhat.com> wrote:
>
> On Tue, Jan 22, 2019 at 12:58:05PM -0200, Arnaldo Carvalho de Melo wrote:
>> Em Tue, Jan 22, 2019 at 03:51:19PM +0100, Jiri Olsa escreveu:
>>> On Tue, Jan 22, 2019 at 12:31:17PM -0200, Arnaldo Carvalho de Melo wrote:
>>>> Em Tue, Jan 22, 2019 at 12:13:20PM -0200, Arnaldo Carvalho de Melo escreveu:
>>>>> Em Fri, Jan 18, 2019 at 11:46:55AM -0300, Arnaldo Carvalho de Melo escreveu:
>>>>>> Em Thu, Jan 17, 2019 at 08:15:19AM -0800, Song Liu escreveu:
>>>>>>> This patch synthesize PERF_RECORD_KSYMBOL and PERF_RECORD_BPF_EVENT for
>>>>>>> BPF programs loaded before perf-record. This is achieved by gathering
>>>>>>> information about all BPF programs via sys_bpf.
>>>>>>
>>>>>> Ditto
>>>>>
>>>>> This is breaking 'perf sched', see below, the fix seems trivial:
>>>>>
>>>>> [root@quaco ~]# perf sched record -a sleep 2
>>>>> [ perf record: Woken up 1 times to write data ]
>>>>> 0x5b60 [0x138]: failed to process type: 17
>>>>> [ perf record: Captured and wrote 1.539 MB perf.data ]
>>>>> [root@quaco ~]# perf sched lat
>>>>> 0x5b60 [0x138]: failed to process type: 17
>>>>> Failed to process events, error -22
>>>>> [root@quaco ~]#
>>>>
>>>> So:
>>>>
>>>> perf_session__process_event (event->header.type = 17 (PERF_RECORD_KSYMBOL)
>>>> if (tool->ordered_events)
>>>> ret = perf_evlist__parse_sample_timestamp(evlist, event, ×tamp);
>>>> if (ret && ret != -1)
>>>> return ret;
>>>>
>>>> So it returns here with -EFAULT, i.e. this is failing:
>>>>
>>>> int perf_evlist__parse_sample_timestamp(struct perf_evlist *evlist,
>>>> union perf_event *event,
>>>> u64 *timestamp)
>>>> {
>>>> struct perf_evsel *evsel = perf_evlist__event2evsel(evlist, event);
>>>>
>>>> if (!evsel)
>>>> return -EFAULT;
>>>> return perf_evsel__parse_sample_timestamp(evsel, event, timestamp);
>>>> }
>>>>
>>>> It isn't mapping the event ID it finds back to an evsel.. Jiri, ideas?
>>>>
>>>> This is happening so far only for 'perf sched', perf record with two
>>>> events works.
>>>
>>> I saw also perf mem failing because of this.. will check
>>
>> Right, seems something with the synthesizing of existing bpf progs,
>> which always there are some nowadays, for instance, on this fedora29
>> system:
>>
>> [root@quaco tmp]# bpftool prog
>> 13: cgroup_skb tag 7be49e3934a125ba gpl
>> loaded_at 2019-01-21T13:30:27-0200 uid 0
>> xlated 296B jited 229B memlock 4096B map_ids 13,14
>> 14: cgroup_skb tag 2a142ef67aaad174 gpl
>> loaded_at 2019-01-21T13:30:27-0200 uid 0
>> xlated 296B jited 229B memlock 4096B map_ids 13,14
>> 15: cgroup_skb tag 7be49e3934a125ba gpl
>> loaded_at 2019-01-21T13:30:27-0200 uid 0
>> xlated 296B jited 229B memlock 4096B map_ids 15,16
>> 16: cgroup_skb tag 2a142ef67aaad174 gpl
>> loaded_at 2019-01-21T13:30:27-0200 uid 0
>> xlated 296B jited 229B memlock 4096B map_ids 15,16
>> 17: cgroup_skb tag 7be49e3934a125ba gpl
>> loaded_at 2019-01-21T13:30:29-0200 uid 0
>> xlated 296B jited 229B memlock 4096B map_ids 17,18
>> 18: cgroup_skb tag 2a142ef67aaad174 gpl
>> loaded_at 2019-01-21T13:30:29-0200 uid 0
>> xlated 296B jited 229B memlock 4096B map_ids 17,18
>> 21: cgroup_skb tag 7be49e3934a125ba gpl
>> loaded_at 2019-01-21T13:30:29-0200 uid 0
>> xlated 296B jited 229B memlock 4096B map_ids 21,22
>> 22: cgroup_skb tag 2a142ef67aaad174 gpl
>> loaded_at 2019-01-21T13:30:29-0200 uid 0
>> xlated 296B jited 229B memlock 4096B map_ids 21,22
>> [root@quaco tmp]#
>>
>> When with a bunch of tracepoints, that is what 'perf mem', 'perf kmem',
>> 'perf sched', etc does, it ends up failing here:
>>
>> ret = perf_evlist__parse_sample_timestamp(evlist, event, ×tamp);
>>
>> So it is not passed to
>>
>> ret = perf_session__queue_event(session, event, timestamp, file_offset);
>>
>> in perf_session__process_event, this happens right when processing
>> buildids in 'perf record', and also in 'perf report', so that is
>> something badly synthesized that hits perf.data for PERF_RECORD_KSYMBOL.
>
> it's reproducible with simple:
> perf record -e cycles,instructions ls
>
> as you said on irc, it's the machine->id_hdr_size size missing
> there's one more glitch, attached patch fixes that for me
> you can't use sizeof(struct ksymbol_event), because it includes
> the name as well.. which screws the size
>
> but I don't know that code that much.. might be still something
> missing
>
> jirka
Hi Arnaldo and Jiri,
Thanks for catching and fixing the bug.
I guess the following is OK?
*bpf_event = (struct bpf_event){
.header = {
.type = PERF_RECORD_BPF_EVENT,
.size = sizeof(struct bpf_event),
},
.type = PERF_BPF_EVENT_PROG_LOAD,
.flags = 0,
.id = info.id,
};
as struct bpf_event doesn't have variable length name:
struct bpf_event {
struct perf_event_header header;
u16 type;
u16 flags;
u32 id;
/* for bpf_prog types */
u8 tag[BPF_TAG_SIZE]; // prog tag
};
Or we need similar fix?
Song
^ permalink raw reply [flat|nested] 33+ messages in thread* Re: [PATCH v11 perf, bpf-next 7/9] perf tools: synthesize PERF_RECORD_* for loaded BPF programs
2019-01-22 18:38 ` Song Liu
@ 2019-01-22 19:15 ` Jiri Olsa
2019-01-22 19:24 ` Song Liu
0 siblings, 1 reply; 33+ messages in thread
From: Jiri Olsa @ 2019-01-22 19:15 UTC (permalink / raw)
To: Song Liu
Cc: Arnaldo Carvalho de Melo, Jiri Olsa, Namhyung Kim, linux-kernel,
netdev, peterz, ast, daniel, Kernel Team
On Tue, Jan 22, 2019 at 06:38:56PM +0000, Song Liu wrote:
SNIP
> >> in perf_session__process_event, this happens right when processing
> >> buildids in 'perf record', and also in 'perf report', so that is
> >> something badly synthesized that hits perf.data for PERF_RECORD_KSYMBOL.
> >
> > it's reproducible with simple:
> > perf record -e cycles,instructions ls
> >
> > as you said on irc, it's the machine->id_hdr_size size missing
> > there's one more glitch, attached patch fixes that for me
> > you can't use sizeof(struct ksymbol_event), because it includes
> > the name as well.. which screws the size
> >
> > but I don't know that code that much.. might be still something
> > missing
> >
> > jirka
>
> Hi Arnaldo and Jiri,
>
> Thanks for catching and fixing the bug.
>
> I guess the following is OK?
>
> *bpf_event = (struct bpf_event){
> .header = {
> .type = PERF_RECORD_BPF_EVENT,
> .size = sizeof(struct bpf_event),
> },
> .type = PERF_BPF_EVENT_PROG_LOAD,
> .flags = 0,
> .id = info.id,
> };
>
> as struct bpf_event doesn't have variable length name:
>
> struct bpf_event {
> struct perf_event_header header;
> u16 type;
> u16 flags;
> u32 id;
>
> /* for bpf_prog types */
> u8 tag[BPF_TAG_SIZE]; // prog tag
> };
>
> Or we need similar fix?
yep, looks good.. also don't forget to add the 'machine->id_hdr_size'
jirka
^ permalink raw reply [flat|nested] 33+ messages in thread* Re: [PATCH v11 perf, bpf-next 7/9] perf tools: synthesize PERF_RECORD_* for loaded BPF programs
2019-01-22 19:15 ` Jiri Olsa
@ 2019-01-22 19:24 ` Song Liu
2019-01-22 19:44 ` Jiri Olsa
2019-01-24 9:49 ` Arnaldo Carvalho de Melo
0 siblings, 2 replies; 33+ messages in thread
From: Song Liu @ 2019-01-22 19:24 UTC (permalink / raw)
To: Jiri Olsa
Cc: Arnaldo Carvalho de Melo, Jiri Olsa, Namhyung Kim, linux-kernel,
netdev, peterz, ast, daniel, Kernel Team
> On Jan 22, 2019, at 11:15 AM, Jiri Olsa <jolsa@redhat.com> wrote:
>
> On Tue, Jan 22, 2019 at 06:38:56PM +0000, Song Liu wrote:
>
> SNIP
>
>>>> in perf_session__process_event, this happens right when processing
>>>> buildids in 'perf record', and also in 'perf report', so that is
>>>> something badly synthesized that hits perf.data for PERF_RECORD_KSYMBOL.
>>>
>>> it's reproducible with simple:
>>> perf record -e cycles,instructions ls
>>>
>>> as you said on irc, it's the machine->id_hdr_size size missing
>>> there's one more glitch, attached patch fixes that for me
>>> you can't use sizeof(struct ksymbol_event), because it includes
>>> the name as well.. which screws the size
>>>
>>> but I don't know that code that much.. might be still something
>>> missing
>>>
>>> jirka
>>
>> Hi Arnaldo and Jiri,
>>
>> Thanks for catching and fixing the bug.
>>
>> I guess the following is OK?
>>
>> *bpf_event = (struct bpf_event){
>> .header = {
>> .type = PERF_RECORD_BPF_EVENT,
>> .size = sizeof(struct bpf_event),
>> },
>> .type = PERF_BPF_EVENT_PROG_LOAD,
>> .flags = 0,
>> .id = info.id,
>> };
>>
>> as struct bpf_event doesn't have variable length name:
>>
>> struct bpf_event {
>> struct perf_event_header header;
>> u16 type;
>> u16 flags;
>> u32 id;
>>
>> /* for bpf_prog types */
>> u8 tag[BPF_TAG_SIZE]; // prog tag
>> };
>>
>> Or we need similar fix?
>
> yep, looks good.. also don't forget to add the 'machine->id_hdr_size'
>
> jirka
So we still need something like?
diff --git i/tools/perf/util/bpf-event.c w/tools/perf/util/bpf-event.c
index 01e1dc1bb7fb..d7bf45485820 100644
--- i/tools/perf/util/bpf-event.c
+++ w/tools/perf/util/bpf-event.c
@@ -4,6 +4,7 @@
#include <bpf/bpf.h>
#include <bpf/btf.h>
#include <linux/btf.h>
+#include "machine.h"
#include "bpf-event.h"
#include "debug.h"
#include "symbol.h"
@@ -187,7 +188,7 @@ static int perf_event__synthesize_one_bpf_prog(struct perf_tool *tool,
*bpf_event = (struct bpf_event){
.header = {
.type = PERF_RECORD_BPF_EVENT,
- .size = sizeof(struct bpf_event),
+ .size = sizeof(struct bpf_event) + machine->id_hdr_size,
},
.type = PERF_BPF_EVENT_PROG_LOAD,
.flags = 0,
Would you send the official patch? Or would you prefer me sending it?
Thanks,
Song
^ permalink raw reply related [flat|nested] 33+ messages in thread* Re: [PATCH v11 perf, bpf-next 7/9] perf tools: synthesize PERF_RECORD_* for loaded BPF programs
2019-01-22 19:24 ` Song Liu
@ 2019-01-22 19:44 ` Jiri Olsa
2019-01-24 9:49 ` Arnaldo Carvalho de Melo
1 sibling, 0 replies; 33+ messages in thread
From: Jiri Olsa @ 2019-01-22 19:44 UTC (permalink / raw)
To: Song Liu
Cc: Arnaldo Carvalho de Melo, Jiri Olsa, Namhyung Kim, linux-kernel,
netdev, peterz, ast, daniel, Kernel Team
On Tue, Jan 22, 2019 at 07:24:43PM +0000, Song Liu wrote:
>
>
> > On Jan 22, 2019, at 11:15 AM, Jiri Olsa <jolsa@redhat.com> wrote:
> >
> > On Tue, Jan 22, 2019 at 06:38:56PM +0000, Song Liu wrote:
> >
> > SNIP
> >
> >>>> in perf_session__process_event, this happens right when processing
> >>>> buildids in 'perf record', and also in 'perf report', so that is
> >>>> something badly synthesized that hits perf.data for PERF_RECORD_KSYMBOL.
> >>>
> >>> it's reproducible with simple:
> >>> perf record -e cycles,instructions ls
> >>>
> >>> as you said on irc, it's the machine->id_hdr_size size missing
> >>> there's one more glitch, attached patch fixes that for me
> >>> you can't use sizeof(struct ksymbol_event), because it includes
> >>> the name as well.. which screws the size
> >>>
> >>> but I don't know that code that much.. might be still something
> >>> missing
> >>>
> >>> jirka
> >>
> >> Hi Arnaldo and Jiri,
> >>
> >> Thanks for catching and fixing the bug.
> >>
> >> I guess the following is OK?
> >>
> >> *bpf_event = (struct bpf_event){
> >> .header = {
> >> .type = PERF_RECORD_BPF_EVENT,
> >> .size = sizeof(struct bpf_event),
> >> },
> >> .type = PERF_BPF_EVENT_PROG_LOAD,
> >> .flags = 0,
> >> .id = info.id,
> >> };
> >>
> >> as struct bpf_event doesn't have variable length name:
> >>
> >> struct bpf_event {
> >> struct perf_event_header header;
> >> u16 type;
> >> u16 flags;
> >> u32 id;
> >>
> >> /* for bpf_prog types */
> >> u8 tag[BPF_TAG_SIZE]; // prog tag
> >> };
> >>
> >> Or we need similar fix?
> >
> > yep, looks good.. also don't forget to add the 'machine->id_hdr_size'
> >
> > jirka
>
> So we still need something like?
>
> diff --git i/tools/perf/util/bpf-event.c w/tools/perf/util/bpf-event.c
> index 01e1dc1bb7fb..d7bf45485820 100644
> --- i/tools/perf/util/bpf-event.c
> +++ w/tools/perf/util/bpf-event.c
> @@ -4,6 +4,7 @@
> #include <bpf/bpf.h>
> #include <bpf/btf.h>
> #include <linux/btf.h>
> +#include "machine.h"
> #include "bpf-event.h"
> #include "debug.h"
> #include "symbol.h"
> @@ -187,7 +188,7 @@ static int perf_event__synthesize_one_bpf_prog(struct perf_tool *tool,
> *bpf_event = (struct bpf_event){
> .header = {
> .type = PERF_RECORD_BPF_EVENT,
> - .size = sizeof(struct bpf_event),
> + .size = sizeof(struct bpf_event) + machine->id_hdr_size,
> },
> .type = PERF_BPF_EVENT_PROG_LOAD,
> .flags = 0,
>
> Would you send the official patch? Or would you prefer me sending it?
plese send it, thanks
jirka
^ permalink raw reply [flat|nested] 33+ messages in thread* Re: [PATCH v11 perf, bpf-next 7/9] perf tools: synthesize PERF_RECORD_* for loaded BPF programs
2019-01-22 19:24 ` Song Liu
2019-01-22 19:44 ` Jiri Olsa
@ 2019-01-24 9:49 ` Arnaldo Carvalho de Melo
1 sibling, 0 replies; 33+ messages in thread
From: Arnaldo Carvalho de Melo @ 2019-01-24 9:49 UTC (permalink / raw)
To: Song Liu
Cc: Jiri Olsa, Jiri Olsa, Namhyung Kim, linux-kernel, netdev, peterz,
ast, daniel, Kernel Team
Em Tue, Jan 22, 2019 at 07:24:43PM +0000, Song Liu escreveu:
> +#include "machine.h"
> #include "bpf-event.h"
> #include "debug.h"
> #include "symbol.h"
> @@ -187,7 +188,7 @@ static int perf_event__synthesize_one_bpf_prog(struct perf_tool *tool,
> *bpf_event = (struct bpf_event){
> .header = {
> .type = PERF_RECORD_BPF_EVENT,
> - .size = sizeof(struct bpf_event),
> + .size = sizeof(struct bpf_event) + machine->id_hdr_size,
> },
> .type = PERF_BPF_EVENT_PROG_LOAD,
> .flags = 0,
>
> Would you send the official patch? Or would you prefer me sending it?
Nevermind, I'll fix this, its just that I'm now travelling.
- Arnaldo
^ permalink raw reply [flat|nested] 33+ messages in thread
* [tip:perf/core] perf tools: Synthesize PERF_RECORD_* for loaded BPF programs
2019-01-17 16:15 ` [PATCH v11 perf, bpf-next 7/9] perf tools: synthesize PERF_RECORD_* for loaded BPF programs Song Liu
2019-01-18 14:46 ` Arnaldo Carvalho de Melo
@ 2019-01-22 10:22 ` tip-bot for Song Liu
1 sibling, 0 replies; 33+ messages in thread
From: tip-bot for Song Liu @ 2019-01-22 10:22 UTC (permalink / raw)
To: linux-tip-commits
Cc: daniel, ast, songliubraving, tglx, peterz, linux-kernel, mingo,
acme, hpa
Commit-ID: 7b612e291a5affb12b9d0b87332c71bcbe9c5db4
Gitweb: https://git.kernel.org/tip/7b612e291a5affb12b9d0b87332c71bcbe9c5db4
Author: Song Liu <songliubraving@fb.com>
AuthorDate: Thu, 17 Jan 2019 08:15:19 -0800
Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Mon, 21 Jan 2019 17:36:39 -0300
perf tools: Synthesize PERF_RECORD_* for loaded BPF programs
This patch synthesize PERF_RECORD_KSYMBOL and PERF_RECORD_BPF_EVENT for
BPF programs loaded before perf-record. This is achieved by gathering
information about all BPF programs via sys_bpf.
Committer notes:
Fix the build on some older systems such as amazonlinux:1 where it was
breaking with:
util/bpf-event.c: In function 'perf_event__synthesize_one_bpf_prog':
util/bpf-event.c:52:9: error: missing initializer for field 'type' of 'struct bpf_prog_info' [-Werror=missing-field-initializers]
struct bpf_prog_info info = {};
^
In file included from /git/linux/tools/lib/bpf/bpf.h:26:0,
from util/bpf-event.c:3:
/git/linux/tools/include/uapi/linux/bpf.h:2699:8: note: 'type' declared here
__u32 type;
^
cc1: all warnings being treated as errors
Further fix on a centos:6 system:
cc1: warnings being treated as errors
util/bpf-event.c: In function 'perf_event__synthesize_one_bpf_prog':
util/bpf-event.c:50: error: 'func_info_rec_size' may be used uninitialized in this function
The compiler is wrong, but to silence it, initialize that variable to
zero.
One more fix, this time for debian:experimental-x-mips, x-mips64 and
x-mipsel:
util/bpf-event.c: In function 'perf_event__synthesize_one_bpf_prog':
util/bpf-event.c:93:16: error: implicit declaration of function 'calloc' [-Werror=implicit-function-declaration]
func_infos = calloc(sub_prog_cnt, func_info_rec_size);
^~~~~~
util/bpf-event.c:93:16: error: incompatible implicit declaration of built-in function 'calloc' [-Werror]
util/bpf-event.c:93:16: note: include '<stdlib.h>' or provide a declaration of 'calloc'
Add the missing header.
Committer testing:
# perf record --bpf-event sleep 1
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.021 MB perf.data (7 samples) ]
# perf report -D | grep PERF_RECORD_BPF_EVENT | nl
1 0 0x4b10 [0x18]: PERF_RECORD_BPF_EVENT bpf event with type 1, flags 0, id 13
2 0 0x4c60 [0x18]: PERF_RECORD_BPF_EVENT bpf event with type 1, flags 0, id 14
3 0 0x4db0 [0x18]: PERF_RECORD_BPF_EVENT bpf event with type 1, flags 0, id 15
4 0 0x4f00 [0x18]: PERF_RECORD_BPF_EVENT bpf event with type 1, flags 0, id 16
5 0 0x5050 [0x18]: PERF_RECORD_BPF_EVENT bpf event with type 1, flags 0, id 17
6 0 0x51a0 [0x18]: PERF_RECORD_BPF_EVENT bpf event with type 1, flags 0, id 18
7 0 0x52f0 [0x18]: PERF_RECORD_BPF_EVENT bpf event with type 1, flags 0, id 21
8 0 0x5440 [0x18]: PERF_RECORD_BPF_EVENT bpf event with type 1, flags 0, id 22
# bpftool prog
13: cgroup_skb tag 7be49e3934a125ba gpl
loaded_at 2019-01-19T09:09:43-0300 uid 0
xlated 296B jited 229B memlock 4096B map_ids 13,14
14: cgroup_skb tag 2a142ef67aaad174 gpl
loaded_at 2019-01-19T09:09:43-0300 uid 0
xlated 296B jited 229B memlock 4096B map_ids 13,14
15: cgroup_skb tag 7be49e3934a125ba gpl
loaded_at 2019-01-19T09:09:43-0300 uid 0
xlated 296B jited 229B memlock 4096B map_ids 15,16
16: cgroup_skb tag 2a142ef67aaad174 gpl
loaded_at 2019-01-19T09:09:43-0300 uid 0
xlated 296B jited 229B memlock 4096B map_ids 15,16
17: cgroup_skb tag 7be49e3934a125ba gpl
loaded_at 2019-01-19T09:09:44-0300 uid 0
xlated 296B jited 229B memlock 4096B map_ids 17,18
18: cgroup_skb tag 2a142ef67aaad174 gpl
loaded_at 2019-01-19T09:09:44-0300 uid 0
xlated 296B jited 229B memlock 4096B map_ids 17,18
21: cgroup_skb tag 7be49e3934a125ba gpl
loaded_at 2019-01-19T09:09:45-0300 uid 0
xlated 296B jited 229B memlock 4096B map_ids 21,22
22: cgroup_skb tag 2a142ef67aaad174 gpl
loaded_at 2019-01-19T09:09:45-0300 uid 0
xlated 296B jited 229B memlock 4096B map_ids 21,22
#
# perf report -D | grep -B22 PERF_RECORD_KSYMBOL
. ... raw event: size 312 bytes
. 0000: 11 00 00 00 00 00 38 01 ff 44 06 c0 ff ff ff ff ......8..D......
. 0010: e5 00 00 00 01 00 00 00 62 70 66 5f 70 72 6f 67 ........bpf_prog
. 0020: 5f 37 62 65 34 39 65 33 39 33 34 61 31 32 35 62 _7be49e3934a125b
. 0030: 61 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 a...............
<SNIP zeroes>
. 0110: 00 00 00 00 00 00 00 00 21 00 00 00 00 00 00 00 ........!.......
. 0120: 7b e4 9e 39 34 a1 25 ba 00 00 00 00 00 00 00 00 {..94.%.........
. 0130: 00 00 00 00 00 00 00 00 ........
0 0x49d8 [0x138]: PERF_RECORD_KSYMBOL ksymbol event with addr ffffffffc00644ff len 229 type 1 flags 0x0 name bpf_prog_7be49e3934a125ba
--
. ... raw event: size 312 bytes
. 0000: 11 00 00 00 00 00 38 01 48 6d 06 c0 ff ff ff ff ......8.Hm......
. 0010: e5 00 00 00 01 00 00 00 62 70 66 5f 70 72 6f 67 ........bpf_prog
. 0020: 5f 32 61 31 34 32 65 66 36 37 61 61 61 64 31 37 _2a142ef67aaad17
. 0030: 34 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4...............
<SNIP zeroes>
. 0110: 00 00 00 00 00 00 00 00 21 00 00 00 00 00 00 00 ........!.......
. 0120: 2a 14 2e f6 7a aa d1 74 00 00 00 00 00 00 00 00 *...z..t........
. 0130: 00 00 00 00 00 00 00 00 ........
0 0x4b28 [0x138]: PERF_RECORD_KSYMBOL ksymbol event with addr ffffffffc0066d48 len 229 type 1 flags 0x0 name bpf_prog_2a142ef67aaad174
--
. ... raw event: size 312 bytes
. 0000: 11 00 00 00 00 00 38 01 04 cf 03 c0 ff ff ff ff ......8.........
. 0010: e5 00 00 00 01 00 00 00 62 70 66 5f 70 72 6f 67 ........bpf_prog
. 0020: 5f 37 62 65 34 39 65 33 39 33 34 61 31 32 35 62 _7be49e3934a125b
. 0030: 61 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 a...............
<SNIP zeroes>
. 0110: 00 00 00 00 00 00 00 00 21 00 00 00 00 00 00 00 ........!.......
. 0120: 7b e4 9e 39 34 a1 25 ba 00 00 00 00 00 00 00 00 {..94.%.........
. 0130: 00 00 00 00 00 00 00 00 ........
0 0x4c78 [0x138]: PERF_RECORD_KSYMBOL ksymbol event with addr ffffffffc003cf04 len 229 type 1 flags 0x0 name bpf_prog_7be49e3934a125ba
--
. ... raw event: size 312 bytes
. 0000: 11 00 00 00 00 00 38 01 96 28 04 c0 ff ff ff ff ......8..(......
. 0010: e5 00 00 00 01 00 00 00 62 70 66 5f 70 72 6f 67 ........bpf_prog
. 0020: 5f 32 61 31 34 32 65 66 36 37 61 61 61 64 31 37 _2a142ef67aaad17
. 0030: 34 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4...............
<SNIP zeroes>
. 0110: 00 00 00 00 00 00 00 00 21 00 00 00 00 00 00 00 ........!.......
. 0120: 2a 14 2e f6 7a aa d1 74 00 00 00 00 00 00 00 00 *...z..t........
. 0130: 00 00 00 00 00 00 00 00 ........
0 0x4dc8 [0x138]: PERF_RECORD_KSYMBOL ksymbol event with addr ffffffffc0042896 len 229 type 1 flags 0x0 name bpf_prog_2a142ef67aaad174
--
. ... raw event: size 312 bytes
. 0000: 11 00 00 00 00 00 38 01 05 13 17 c0 ff ff ff ff ......8.........
. 0010: e5 00 00 00 01 00 00 00 62 70 66 5f 70 72 6f 67 ........bpf_prog
. 0020: 5f 37 62 65 34 39 65 33 39 33 34 61 31 32 35 62 _7be49e3934a125b
. 0030: 61 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 a...............
<SNIP zeroes>
. 0110: 00 00 00 00 00 00 00 00 21 00 00 00 00 00 00 00 ........!.......
. 0120: 7b e4 9e 39 34 a1 25 ba 00 00 00 00 00 00 00 00 {..94.%.........
. 0130: 00 00 00 00 00 00 00 00 ........
0 0x4f18 [0x138]: PERF_RECORD_KSYMBOL ksymbol event with addr ffffffffc0171305 len 229 type 1 flags 0x0 name bpf_prog_7be49e3934a125ba
--
. ... raw event: size 312 bytes
. 0000: 11 00 00 00 00 00 38 01 0a 8c 23 c0 ff ff ff ff ......8...#.....
. 0010: e5 00 00 00 01 00 00 00 62 70 66 5f 70 72 6f 67 ........bpf_prog
. 0020: 5f 32 61 31 34 32 65 66 36 37 61 61 61 64 31 37 _2a142ef67aaad17
. 0030: 34 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4...............
<SNIP zeroes>
. 0110: 00 00 00 00 00 00 00 00 21 00 00 00 00 00 00 00 ........!.......
. 0120: 2a 14 2e f6 7a aa d1 74 00 00 00 00 00 00 00 00 *...z..t........
. 0130: 00 00 00 00 00 00 00 00 ........
0 0x5068 [0x138]: PERF_RECORD_KSYMBOL ksymbol event with addr ffffffffc0238c0a len 229 type 1 flags 0x0 name bpf_prog_2a142ef67aaad174
--
. ... raw event: size 312 bytes
. 0000: 11 00 00 00 00 00 38 01 2a a5 a4 c0 ff ff ff ff ......8.*.......
. 0010: e5 00 00 00 01 00 00 00 62 70 66 5f 70 72 6f 67 ........bpf_prog
. 0020: 5f 37 62 65 34 39 65 33 39 33 34 61 31 32 35 62 _7be49e3934a125b
. 0030: 61 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 a...............
<SNIP zeroes>
. 0110: 00 00 00 00 00 00 00 00 21 00 00 00 00 00 00 00 ........!.......
. 0120: 7b e4 9e 39 34 a1 25 ba 00 00 00 00 00 00 00 00 {..94.%.........
. 0130: 00 00 00 00 00 00 00 00 ........
0 0x51b8 [0x138]: PERF_RECORD_KSYMBOL ksymbol event with addr ffffffffc0a4a52a len 229 type 1 flags 0x0 name bpf_prog_7be49e3934a125ba
--
. ... raw event: size 312 bytes
. 0000: 11 00 00 00 00 00 38 01 9b c9 a4 c0 ff ff ff ff ......8.........
. 0010: e5 00 00 00 01 00 00 00 62 70 66 5f 70 72 6f 67 ........bpf_prog
. 0020: 5f 32 61 31 34 32 65 66 36 37 61 61 61 64 31 37 _2a142ef67aaad17
. 0030: 34 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4...............
<SNIP zeroes>
. 0110: 00 00 00 00 00 00 00 00 21 00 00 00 00 00 00 00 ........!.......
. 0120: 2a 14 2e f6 7a aa d1 74 00 00 00 00 00 00 00 00 *...z..t........
. 0130: 00 00 00 00 00 00 00 00 ........
0 0x5308 [0x138]: PERF_RECORD_KSYMBOL ksymbol event with addr ffffffffc0a4c99b len 229 type 1 flags 0x0 name bpf_prog_2a142ef67aaad174
Signed-off-by: Song Liu <songliubraving@fb.com>
Reviewed-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: kernel-team@fb.com
Cc: netdev@vger.kernel.org
Link: http://lkml.kernel.org/r/20190117161521.1341602-8-songliubraving@fb.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/builtin-record.c | 6 ++
tools/perf/util/bpf-event.c | 242 ++++++++++++++++++++++++++++++++++++++++++++
tools/perf/util/bpf-event.h | 16 +++
3 files changed, 264 insertions(+)
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index deaf9b902094..88ea11d57c6f 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -41,6 +41,7 @@
#include "util/perf-hooks.h"
#include "util/time-utils.h"
#include "util/units.h"
+#include "util/bpf-event.h"
#include "asm/bug.h"
#include <errno.h>
@@ -1082,6 +1083,11 @@ static int record__synthesize(struct record *rec, bool tail)
return err;
}
+ err = perf_event__synthesize_bpf_events(tool, process_synthesized_event,
+ machine, opts);
+ if (err < 0)
+ pr_warning("Couldn't synthesize bpf events.\n");
+
err = __machine__synthesize_threads(machine, tool, &opts->target, rec->evlist->threads,
process_synthesized_event, opts->sample_address,
1);
diff --git a/tools/perf/util/bpf-event.c b/tools/perf/util/bpf-event.c
index 87004706874f..01e1dc1bb7fb 100644
--- a/tools/perf/util/bpf-event.c
+++ b/tools/perf/util/bpf-event.c
@@ -1,10 +1,25 @@
// SPDX-License-Identifier: GPL-2.0
#include <errno.h>
+#include <stdlib.h>
#include <bpf/bpf.h>
+#include <bpf/btf.h>
+#include <linux/btf.h>
#include "bpf-event.h"
#include "debug.h"
#include "symbol.h"
+#define ptr_to_u64(ptr) ((__u64)(unsigned long)(ptr))
+
+static int snprintf_hex(char *buf, size_t size, unsigned char *data, size_t len)
+{
+ int ret = 0;
+ size_t i;
+
+ for (i = 0; i < len; i++)
+ ret += snprintf(buf + ret, size - ret, "%02x", data[i]);
+ return ret;
+}
+
int machine__process_bpf_event(struct machine *machine __maybe_unused,
union perf_event *event,
struct perf_sample *sample __maybe_unused)
@@ -13,3 +28,230 @@ int machine__process_bpf_event(struct machine *machine __maybe_unused,
perf_event__fprintf_bpf_event(event, stdout);
return 0;
}
+
+/*
+ * Synthesize PERF_RECORD_KSYMBOL and PERF_RECORD_BPF_EVENT for one bpf
+ * program. One PERF_RECORD_BPF_EVENT is generated for the program. And
+ * one PERF_RECORD_KSYMBOL is generated for each sub program.
+ *
+ * Returns:
+ * 0 for success;
+ * -1 for failures;
+ * -2 for lack of kernel support.
+ */
+static int perf_event__synthesize_one_bpf_prog(struct perf_tool *tool,
+ perf_event__handler_t process,
+ struct machine *machine,
+ int fd,
+ union perf_event *event,
+ struct record_opts *opts)
+{
+ struct ksymbol_event *ksymbol_event = &event->ksymbol_event;
+ struct bpf_event *bpf_event = &event->bpf_event;
+ u32 sub_prog_cnt, i, func_info_rec_size = 0;
+ u8 (*prog_tags)[BPF_TAG_SIZE] = NULL;
+ struct bpf_prog_info info = { .type = 0, };
+ u32 info_len = sizeof(info);
+ void *func_infos = NULL;
+ u64 *prog_addrs = NULL;
+ struct btf *btf = NULL;
+ u32 *prog_lens = NULL;
+ bool has_btf = false;
+ char errbuf[512];
+ int err = 0;
+
+ /* Call bpf_obj_get_info_by_fd() to get sizes of arrays */
+ err = bpf_obj_get_info_by_fd(fd, &info, &info_len);
+
+ if (err) {
+ pr_debug("%s: failed to get BPF program info: %s, aborting\n",
+ __func__, str_error_r(errno, errbuf, sizeof(errbuf)));
+ return -1;
+ }
+ if (info_len < offsetof(struct bpf_prog_info, prog_tags)) {
+ pr_debug("%s: the kernel is too old, aborting\n", __func__);
+ return -2;
+ }
+
+ /* number of ksyms, func_lengths, and tags should match */
+ sub_prog_cnt = info.nr_jited_ksyms;
+ if (sub_prog_cnt != info.nr_prog_tags ||
+ sub_prog_cnt != info.nr_jited_func_lens)
+ return -1;
+
+ /* check BTF func info support */
+ if (info.btf_id && info.nr_func_info && info.func_info_rec_size) {
+ /* btf func info number should be same as sub_prog_cnt */
+ if (sub_prog_cnt != info.nr_func_info) {
+ pr_debug("%s: mismatch in BPF sub program count and BTF function info count, aborting\n", __func__);
+ return -1;
+ }
+ if (btf__get_from_id(info.btf_id, &btf)) {
+ pr_debug("%s: failed to get BTF of id %u, aborting\n", __func__, info.btf_id);
+ return -1;
+ }
+ func_info_rec_size = info.func_info_rec_size;
+ func_infos = calloc(sub_prog_cnt, func_info_rec_size);
+ if (!func_infos) {
+ pr_debug("%s: failed to allocate memory for func_infos, aborting\n", __func__);
+ return -1;
+ }
+ has_btf = true;
+ }
+
+ /*
+ * We need address, length, and tag for each sub program.
+ * Allocate memory and call bpf_obj_get_info_by_fd() again
+ */
+ prog_addrs = calloc(sub_prog_cnt, sizeof(u64));
+ if (!prog_addrs) {
+ pr_debug("%s: failed to allocate memory for prog_addrs, aborting\n", __func__);
+ goto out;
+ }
+ prog_lens = calloc(sub_prog_cnt, sizeof(u32));
+ if (!prog_lens) {
+ pr_debug("%s: failed to allocate memory for prog_lens, aborting\n", __func__);
+ goto out;
+ }
+ prog_tags = calloc(sub_prog_cnt, BPF_TAG_SIZE);
+ if (!prog_tags) {
+ pr_debug("%s: failed to allocate memory for prog_tags, aborting\n", __func__);
+ goto out;
+ }
+
+ memset(&info, 0, sizeof(info));
+ info.nr_jited_ksyms = sub_prog_cnt;
+ info.nr_jited_func_lens = sub_prog_cnt;
+ info.nr_prog_tags = sub_prog_cnt;
+ info.jited_ksyms = ptr_to_u64(prog_addrs);
+ info.jited_func_lens = ptr_to_u64(prog_lens);
+ info.prog_tags = ptr_to_u64(prog_tags);
+ info_len = sizeof(info);
+ if (has_btf) {
+ info.nr_func_info = sub_prog_cnt;
+ info.func_info_rec_size = func_info_rec_size;
+ info.func_info = ptr_to_u64(func_infos);
+ }
+
+ err = bpf_obj_get_info_by_fd(fd, &info, &info_len);
+ if (err) {
+ pr_debug("%s: failed to get BPF program info, aborting\n", __func__);
+ goto out;
+ }
+
+ /* Synthesize PERF_RECORD_KSYMBOL */
+ for (i = 0; i < sub_prog_cnt; i++) {
+ const struct bpf_func_info *finfo;
+ const char *short_name = NULL;
+ const struct btf_type *t;
+ int name_len;
+
+ *ksymbol_event = (struct ksymbol_event){
+ .header = {
+ .type = PERF_RECORD_KSYMBOL,
+ .size = sizeof(struct ksymbol_event),
+ },
+ .addr = prog_addrs[i],
+ .len = prog_lens[i],
+ .ksym_type = PERF_RECORD_KSYMBOL_TYPE_BPF,
+ .flags = 0,
+ };
+ name_len = snprintf(ksymbol_event->name, KSYM_NAME_LEN,
+ "bpf_prog_");
+ name_len += snprintf_hex(ksymbol_event->name + name_len,
+ KSYM_NAME_LEN - name_len,
+ prog_tags[i], BPF_TAG_SIZE);
+ if (has_btf) {
+ finfo = func_infos + i * info.func_info_rec_size;
+ t = btf__type_by_id(btf, finfo->type_id);
+ short_name = btf__name_by_offset(btf, t->name_off);
+ } else if (i == 0 && sub_prog_cnt == 1) {
+ /* no subprog */
+ if (info.name[0])
+ short_name = info.name;
+ } else
+ short_name = "F";
+ if (short_name)
+ name_len += snprintf(ksymbol_event->name + name_len,
+ KSYM_NAME_LEN - name_len,
+ "_%s", short_name);
+
+ ksymbol_event->header.size += PERF_ALIGN(name_len + 1,
+ sizeof(u64));
+ err = perf_tool__process_synth_event(tool, event,
+ machine, process);
+ }
+
+ /* Synthesize PERF_RECORD_BPF_EVENT */
+ if (opts->bpf_event) {
+ *bpf_event = (struct bpf_event){
+ .header = {
+ .type = PERF_RECORD_BPF_EVENT,
+ .size = sizeof(struct bpf_event),
+ },
+ .type = PERF_BPF_EVENT_PROG_LOAD,
+ .flags = 0,
+ .id = info.id,
+ };
+ memcpy(bpf_event->tag, prog_tags[i], BPF_TAG_SIZE);
+ err = perf_tool__process_synth_event(tool, event,
+ machine, process);
+ }
+
+out:
+ free(prog_tags);
+ free(prog_lens);
+ free(prog_addrs);
+ free(func_infos);
+ free(btf);
+ return err ? -1 : 0;
+}
+
+int perf_event__synthesize_bpf_events(struct perf_tool *tool,
+ perf_event__handler_t process,
+ struct machine *machine,
+ struct record_opts *opts)
+{
+ union perf_event *event;
+ __u32 id = 0;
+ int err;
+ int fd;
+
+ event = malloc(sizeof(event->bpf_event) + KSYM_NAME_LEN);
+ if (!event)
+ return -1;
+ while (true) {
+ err = bpf_prog_get_next_id(id, &id);
+ if (err) {
+ if (errno == ENOENT) {
+ err = 0;
+ break;
+ }
+ pr_debug("%s: can't get next program: %s%s",
+ __func__, strerror(errno),
+ errno == EINVAL ? " -- kernel too old?" : "");
+ /* don't report error on old kernel */
+ err = (errno == EINVAL) ? 0 : -1;
+ break;
+ }
+ fd = bpf_prog_get_fd_by_id(id);
+ if (fd < 0) {
+ pr_debug("%s: failed to get fd for prog_id %u\n",
+ __func__, id);
+ continue;
+ }
+
+ err = perf_event__synthesize_one_bpf_prog(tool, process,
+ machine, fd,
+ event, opts);
+ close(fd);
+ if (err) {
+ /* do not return error for old kernel */
+ if (err == -2)
+ err = 0;
+ break;
+ }
+ }
+ free(event);
+ return err;
+}
diff --git a/tools/perf/util/bpf-event.h b/tools/perf/util/bpf-event.h
index da0dfc035fc6..7890067e1a37 100644
--- a/tools/perf/util/bpf-event.h
+++ b/tools/perf/util/bpf-event.h
@@ -3,14 +3,22 @@
#define __PERF_BPF_EVENT_H
#include <linux/compiler.h>
+#include "event.h"
struct machine;
union perf_event;
struct perf_sample;
+struct perf_tool;
+struct record_opts;
#ifdef HAVE_LIBBPF_SUPPORT
int machine__process_bpf_event(struct machine *machine, union perf_event *event,
struct perf_sample *sample);
+
+int perf_event__synthesize_bpf_events(struct perf_tool *tool,
+ perf_event__handler_t process,
+ struct machine *machine,
+ struct record_opts *opts);
#else
static inline int machine__process_bpf_event(struct machine *machine __maybe_unused,
union perf_event *event __maybe_unused,
@@ -18,5 +26,13 @@ static inline int machine__process_bpf_event(struct machine *machine __maybe_unu
{
return 0;
}
+
+static inline int perf_event__synthesize_bpf_events(struct perf_tool *tool __maybe_unused,
+ perf_event__handler_t process __maybe_unused,
+ struct machine *machine __maybe_unused,
+ struct record_opts *opts __maybe_unused)
+{
+ return 0;
+}
#endif // HAVE_LIBBPF_SUPPORT
#endif
^ permalink raw reply related [flat|nested] 33+ messages in thread
* [PATCH v11 perf, bpf-next 8/9] perf top: Synthesize BPF events for pre-existing loaded BPF programs
2019-01-17 16:15 [PATCH v11 perf, bpf-next 0/9] reveal invisible bpf programs Song Liu
` (6 preceding siblings ...)
2019-01-17 16:15 ` [PATCH v11 perf, bpf-next 7/9] perf tools: synthesize PERF_RECORD_* for loaded BPF programs Song Liu
@ 2019-01-17 16:15 ` Song Liu
2019-01-22 10:22 ` [tip:perf/core] " tip-bot for Arnaldo Carvalho de Melo
2019-01-17 16:15 ` [PATCH v11 perf, bpf-next 9/9] bpf: add module name [bpf] to ksymbols for bpf programs Song Liu
8 siblings, 1 reply; 33+ messages in thread
From: Song Liu @ 2019-01-17 16:15 UTC (permalink / raw)
To: linux-kernel, netdev
Cc: Arnaldo Carvalho de Melo, peterz, acme, ast, daniel, kernel-team,
Song Liu, David Ahern
From: Arnaldo Carvalho de Melo <acme@redhat.com>
So that we can resolve symbols and map names.
Cc: Song Liu <songliubraving@fb.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: David Ahern <dsahern@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: kernel-team@fb.com
Cc: netdev@vger.kernel.org
Link: https://lkml.kernel.org/n/tip-h3loibff6htedj43q7uinon0@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Song Liu <songliubraving@fb.com>
---
tools/perf/builtin-top.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index f64e312db787..5a486d4de56e 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -22,6 +22,7 @@
#include "perf.h"
#include "util/annotate.h"
+#include "util/bpf-event.h"
#include "util/config.h"
#include "util/color.h"
#include "util/drv_configs.h"
@@ -1215,6 +1216,12 @@ static int __cmd_top(struct perf_top *top)
init_process_thread(top);
+ ret = perf_event__synthesize_bpf_events(&top->tool, perf_event__process,
+ &top->session->machines.host,
+ &top->record_opts);
+ if (ret < 0)
+ pr_warning("Couldn't synthesize bpf events.\n");
+
machine__synthesize_threads(&top->session->machines.host, &opts->target,
top->evlist->threads, false,
top->nr_threads_synthesize);
--
2.17.1
^ permalink raw reply related [flat|nested] 33+ messages in thread* [tip:perf/core] perf top: Synthesize BPF events for pre-existing loaded BPF programs
2019-01-17 16:15 ` [PATCH v11 perf, bpf-next 8/9] perf top: Synthesize BPF events for pre-existing " Song Liu
@ 2019-01-22 10:22 ` tip-bot for Arnaldo Carvalho de Melo
0 siblings, 0 replies; 33+ messages in thread
From: tip-bot for Arnaldo Carvalho de Melo @ 2019-01-22 10:22 UTC (permalink / raw)
To: linux-tip-commits
Cc: tglx, ast, linux-kernel, daniel, hpa, dsahern, acme, peterz,
mingo, songliubraving
Commit-ID: a40b95bcd30cf77c6c7a00f879dfecbded47b3bd
Gitweb: https://git.kernel.org/tip/a40b95bcd30cf77c6c7a00f879dfecbded47b3bd
Author: Arnaldo Carvalho de Melo <acme@redhat.com>
AuthorDate: Thu, 17 Jan 2019 08:15:20 -0800
Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Mon, 21 Jan 2019 17:38:56 -0300
perf top: Synthesize BPF events for pre-existing loaded BPF programs
So that we can resolve symbols and map names.
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: David Ahern <dsahern@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Song Liu <songliubraving@fb.com>
Cc: kernel-team@fb.com
Cc: netdev@vger.kernel.org
Link: http://lkml.kernel.org/r/20190117161521.1341602-9-songliubraving@fb.com
Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/builtin-top.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index f64e312db787..5a486d4de56e 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -22,6 +22,7 @@
#include "perf.h"
#include "util/annotate.h"
+#include "util/bpf-event.h"
#include "util/config.h"
#include "util/color.h"
#include "util/drv_configs.h"
@@ -1215,6 +1216,12 @@ static int __cmd_top(struct perf_top *top)
init_process_thread(top);
+ ret = perf_event__synthesize_bpf_events(&top->tool, perf_event__process,
+ &top->session->machines.host,
+ &top->record_opts);
+ if (ret < 0)
+ pr_warning("Couldn't synthesize bpf events.\n");
+
machine__synthesize_threads(&top->session->machines.host, &opts->target,
top->evlist->threads, false,
top->nr_threads_synthesize);
^ permalink raw reply related [flat|nested] 33+ messages in thread
* [PATCH v11 perf, bpf-next 9/9] bpf: add module name [bpf] to ksymbols for bpf programs
2019-01-17 16:15 [PATCH v11 perf, bpf-next 0/9] reveal invisible bpf programs Song Liu
` (7 preceding siblings ...)
2019-01-17 16:15 ` [PATCH v11 perf, bpf-next 8/9] perf top: Synthesize BPF events for pre-existing " Song Liu
@ 2019-01-17 16:15 ` Song Liu
2019-01-22 10:23 ` [tip:perf/core] bpf: Add " tip-bot for Song Liu
8 siblings, 1 reply; 33+ messages in thread
From: Song Liu @ 2019-01-17 16:15 UTC (permalink / raw)
To: linux-kernel, netdev; +Cc: Song Liu, peterz, acme, ast, daniel, kernel-team
With this patch, /proc/kallsyms will show BPF programs as
<addr> t bpf_prog_<tag>_<name> [bpf]
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Song Liu <songliubraving@fb.com>
---
kernel/kallsyms.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/kallsyms.c b/kernel/kallsyms.c
index f3a04994e063..14934afa9e68 100644
--- a/kernel/kallsyms.c
+++ b/kernel/kallsyms.c
@@ -494,7 +494,7 @@ static int get_ksymbol_ftrace_mod(struct kallsym_iter *iter)
static int get_ksymbol_bpf(struct kallsym_iter *iter)
{
- iter->module_name[0] = '\0';
+ strlcpy(iter->module_name, "bpf", MODULE_NAME_LEN);
iter->exported = 0;
return bpf_get_kallsym(iter->pos - iter->pos_ftrace_mod_end,
&iter->value, &iter->type,
--
2.17.1
^ permalink raw reply related [flat|nested] 33+ messages in thread* [tip:perf/core] bpf: Add module name [bpf] to ksymbols for bpf programs
2019-01-17 16:15 ` [PATCH v11 perf, bpf-next 9/9] bpf: add module name [bpf] to ksymbols for bpf programs Song Liu
@ 2019-01-22 10:23 ` tip-bot for Song Liu
0 siblings, 0 replies; 33+ messages in thread
From: tip-bot for Song Liu @ 2019-01-22 10:23 UTC (permalink / raw)
To: linux-tip-commits
Cc: songliubraving, tglx, acme, linux-kernel, hpa, daniel, peterz,
mingo, ast
Commit-ID: 6934058d9fb6c058fb5e5b11cdcb19834e205c91
Gitweb: https://git.kernel.org/tip/6934058d9fb6c058fb5e5b11cdcb19834e205c91
Author: Song Liu <songliubraving@fb.com>
AuthorDate: Thu, 17 Jan 2019 08:15:21 -0800
Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Mon, 21 Jan 2019 17:38:56 -0300
bpf: Add module name [bpf] to ksymbols for bpf programs
With this patch, /proc/kallsyms will show BPF programs as
<addr> t bpf_prog_<tag>_<name> [bpf]
Signed-off-by: Song Liu <songliubraving@fb.com>
Reviewed-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: kernel-team@fb.com
Cc: netdev@vger.kernel.org
Link: http://lkml.kernel.org/r/20190117161521.1341602-10-songliubraving@fb.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
kernel/kallsyms.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/kallsyms.c b/kernel/kallsyms.c
index f3a04994e063..14934afa9e68 100644
--- a/kernel/kallsyms.c
+++ b/kernel/kallsyms.c
@@ -494,7 +494,7 @@ static int get_ksymbol_ftrace_mod(struct kallsym_iter *iter)
static int get_ksymbol_bpf(struct kallsym_iter *iter)
{
- iter->module_name[0] = '\0';
+ strlcpy(iter->module_name, "bpf", MODULE_NAME_LEN);
iter->exported = 0;
return bpf_get_kallsym(iter->pos - iter->pos_ftrace_mod_end,
&iter->value, &iter->type,
^ permalink raw reply related [flat|nested] 33+ messages in thread