From: tip-bot for Wang Nan <tipbot@zytor.com>
To: linux-tip-commits@vger.kernel.org
Cc: brendan.d.gregg@gmail.com, masami.hiramatsu.pt@hitachi.com,
ast@plumgrid.com, daniel@iogearbox.net, lizefan@huawei.com,
jolsa@kernel.org, namhyung@kernel.org, hpa@zytor.com,
dsahern@gmail.com, tglx@linutronix.de, wangnan0@huawei.com,
a.p.zijlstra@chello.nl, acme@redhat.com, mingo@kernel.org,
linux-kernel@vger.kernel.org, xiakaixu@huawei.com,
hekuang@huawei.com
Subject: [tip:perf/core] perf tools: Compile scriptlets to BPF objects when passing '.c' to --event
Date: Fri, 30 Oct 2015 02:14:35 -0700 [thread overview]
Message-ID: <tip-d509db0473e40134286271b1d1adadccf42ac467@git.kernel.org> (raw)
In-Reply-To: <1444826502-49291-10-git-send-email-wangnan0@huawei.com>
Commit-ID: d509db0473e40134286271b1d1adadccf42ac467
Gitweb: http://git.kernel.org/tip/d509db0473e40134286271b1d1adadccf42ac467
Author: Wang Nan <wangnan0@huawei.com>
AuthorDate: Wed, 14 Oct 2015 12:41:20 +0000
Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Thu, 29 Oct 2015 17:16:23 -0300
perf tools: Compile scriptlets to BPF objects when passing '.c' to --event
This patch provides infrastructure for passing source files to --event
directly using:
# perf record --event bpf-file.c command
This patch does following works:
1) Allow passing '.c' file to '--event'. parse_events_load_bpf() is
expanded to allow caller tell it whether the passed file is source
file or object.
2) llvm__compile_bpf() is called to compile the '.c' file, the result
is saved into memory. Use bpf_object__open_buffer() to load the
in-memory object.
Introduces a bpf-script-example.c so we can manually test it:
# perf record --clang-opt "-DLINUX_VERSION_CODE=0x40200" --event ./bpf-script-example.c sleep 1
Note that '--clang-opt' must put before '--event'.
Futher patches will merge it into a testcase so can be tested automatically.
Signed-off-by: Wang Nan <wangnan0@huawei.com>
Acked-by: Alexei Starovoitov <ast@plumgrid.com>
Cc: Brendan Gregg <brendan.d.gregg@gmail.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: David Ahern <dsahern@gmail.com>
Cc: He Kuang <hekuang@huawei.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kaixu Xia <xiakaixu@huawei.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1444826502-49291-10-git-send-email-wangnan0@huawei.com
Signed-off-by: He Kuang <hekuang@huawei.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/tests/bpf-script-example.c | 44 +++++++++++++++++++++++++++++++++++
tools/perf/util/bpf-loader.c | 17 ++++++++++++--
tools/perf/util/bpf-loader.h | 5 ++--
tools/perf/util/parse-events.c | 5 ++--
tools/perf/util/parse-events.h | 3 ++-
tools/perf/util/parse-events.l | 3 +++
tools/perf/util/parse-events.y | 15 ++++++++++--
7 files changed, 83 insertions(+), 9 deletions(-)
diff --git a/tools/perf/tests/bpf-script-example.c b/tools/perf/tests/bpf-script-example.c
new file mode 100644
index 0000000..410a70b
--- /dev/null
+++ b/tools/perf/tests/bpf-script-example.c
@@ -0,0 +1,44 @@
+#ifndef LINUX_VERSION_CODE
+# error Need LINUX_VERSION_CODE
+# error Example: for 4.2 kernel, put 'clang-opt="-DLINUX_VERSION_CODE=0x40200" into llvm section of ~/.perfconfig'
+#endif
+#define BPF_ANY 0
+#define BPF_MAP_TYPE_ARRAY 2
+#define BPF_FUNC_map_lookup_elem 1
+#define BPF_FUNC_map_update_elem 2
+
+static void *(*bpf_map_lookup_elem)(void *map, void *key) =
+ (void *) BPF_FUNC_map_lookup_elem;
+static void *(*bpf_map_update_elem)(void *map, void *key, void *value, int flags) =
+ (void *) BPF_FUNC_map_update_elem;
+
+struct bpf_map_def {
+ unsigned int type;
+ unsigned int key_size;
+ unsigned int value_size;
+ unsigned int max_entries;
+};
+
+#define SEC(NAME) __attribute__((section(NAME), used))
+struct bpf_map_def SEC("maps") flip_table = {
+ .type = BPF_MAP_TYPE_ARRAY,
+ .key_size = sizeof(int),
+ .value_size = sizeof(int),
+ .max_entries = 1,
+};
+
+SEC("func=sys_epoll_pwait")
+int bpf_func__sys_epoll_pwait(void *ctx)
+{
+ int ind =0;
+ int *flag = bpf_map_lookup_elem(&flip_table, &ind);
+ int new_flag;
+ if (!flag)
+ return 0;
+ /* flip flag and store back */
+ new_flag = !*flag;
+ bpf_map_update_elem(&flip_table, &ind, &new_flag, BPF_ANY);
+ return new_flag;
+}
+char _license[] SEC("license") = "GPL";
+int _version SEC("version") = LINUX_VERSION_CODE;
diff --git a/tools/perf/util/bpf-loader.c b/tools/perf/util/bpf-loader.c
index aa784a4..ba6f752 100644
--- a/tools/perf/util/bpf-loader.c
+++ b/tools/perf/util/bpf-loader.c
@@ -12,6 +12,7 @@
#include "bpf-loader.h"
#include "probe-event.h"
#include "probe-finder.h" // for MAX_PROBES
+#include "llvm-utils.h"
#define DEFINE_PRINT_FN(name, level) \
static int libbpf_##name(const char *fmt, ...) \
@@ -33,7 +34,7 @@ struct bpf_prog_priv {
struct perf_probe_event pev;
};
-struct bpf_object *bpf__prepare_load(const char *filename)
+struct bpf_object *bpf__prepare_load(const char *filename, bool source)
{
struct bpf_object *obj;
static bool libbpf_initialized;
@@ -45,7 +46,19 @@ struct bpf_object *bpf__prepare_load(const char *filename)
libbpf_initialized = true;
}
- obj = bpf_object__open(filename);
+ if (source) {
+ int err;
+ void *obj_buf;
+ size_t obj_buf_sz;
+
+ err = llvm__compile_bpf(filename, &obj_buf, &obj_buf_sz);
+ if (err)
+ return ERR_PTR(err);
+ obj = bpf_object__open_buffer(obj_buf, obj_buf_sz, filename);
+ free(obj_buf);
+ } else
+ obj = bpf_object__open(filename);
+
if (!obj) {
pr_debug("bpf: failed to load %s\n", filename);
return ERR_PTR(-EINVAL);
diff --git a/tools/perf/util/bpf-loader.h b/tools/perf/util/bpf-loader.h
index a8f25ee..ccd8d7f 100644
--- a/tools/perf/util/bpf-loader.h
+++ b/tools/perf/util/bpf-loader.h
@@ -18,7 +18,7 @@ typedef int (*bpf_prog_iter_callback_t)(struct probe_trace_event *tev,
int fd, void *arg);
#ifdef HAVE_LIBBPF_SUPPORT
-struct bpf_object *bpf__prepare_load(const char *filename);
+struct bpf_object *bpf__prepare_load(const char *filename, bool source);
void bpf__clear(void);
@@ -34,7 +34,8 @@ int bpf__foreach_tev(struct bpf_object *obj,
bpf_prog_iter_callback_t func, void *arg);
#else
static inline struct bpf_object *
-bpf__prepare_load(const char *filename __maybe_unused)
+bpf__prepare_load(const char *filename __maybe_unused,
+ bool source __maybe_unused)
{
pr_debug("ERROR: eBPF object loading is disabled during compiling.\n");
return ERR_PTR(-ENOTSUP);
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index cee8c61..bee6058 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -626,11 +626,12 @@ errout:
int parse_events_load_bpf(struct parse_events_evlist *data,
struct list_head *list,
- char *bpf_file_name)
+ char *bpf_file_name,
+ bool source)
{
struct bpf_object *obj;
- obj = bpf__prepare_load(bpf_file_name);
+ obj = bpf__prepare_load(bpf_file_name, source);
if (IS_ERR(obj) || !obj) {
char errbuf[BUFSIZ];
int err;
diff --git a/tools/perf/util/parse-events.h b/tools/perf/util/parse-events.h
index 765018a..f1a6db1 100644
--- a/tools/perf/util/parse-events.h
+++ b/tools/perf/util/parse-events.h
@@ -125,7 +125,8 @@ int parse_events_add_tracepoint(struct list_head *list, int *idx,
struct list_head *head_config);
int parse_events_load_bpf(struct parse_events_evlist *data,
struct list_head *list,
- char *bpf_file_name);
+ char *bpf_file_name,
+ bool source);
/* Provide this function for perf test */
struct bpf_object;
int parse_events_load_bpf_obj(struct parse_events_evlist *data,
diff --git a/tools/perf/util/parse-events.l b/tools/perf/util/parse-events.l
index cf330eb..58c5831 100644
--- a/tools/perf/util/parse-events.l
+++ b/tools/perf/util/parse-events.l
@@ -116,6 +116,7 @@ group [^,{}/]*[{][^}]*[}][^,{}/]*
event_pmu [^,{}/]+[/][^/]*[/][^,{}/]*
event [^,{}/]+
bpf_object .*\.(o|bpf)
+bpf_source .*\.c
num_dec [0-9]+
num_hex 0x[a-fA-F0-9]+
@@ -161,6 +162,7 @@ modifier_bp [rwx]{1,3}
{event_pmu} |
{bpf_object} |
+{bpf_source} |
{event} {
BEGIN(INITIAL);
REWIND(1);
@@ -269,6 +271,7 @@ r{num_raw_hex} { return raw(yyscanner); }
{modifier_event} { return str(yyscanner, PE_MODIFIER_EVENT); }
{bpf_object} { return str(yyscanner, PE_BPF_OBJECT); }
+{bpf_source} { return str(yyscanner, PE_BPF_SOURCE); }
{name} { return pmu_str_check(yyscanner); }
"/" { BEGIN(config); return '/'; }
- { return '-'; }
diff --git a/tools/perf/util/parse-events.y b/tools/perf/util/parse-events.y
index 497f19b..ad37996 100644
--- a/tools/perf/util/parse-events.y
+++ b/tools/perf/util/parse-events.y
@@ -42,7 +42,7 @@ static inc_group_count(struct list_head *list,
%token PE_VALUE PE_VALUE_SYM_HW PE_VALUE_SYM_SW PE_RAW PE_TERM
%token PE_EVENT_NAME
%token PE_NAME
-%token PE_BPF_OBJECT
+%token PE_BPF_OBJECT PE_BPF_SOURCE
%token PE_MODIFIER_EVENT PE_MODIFIER_BP
%token PE_NAME_CACHE_TYPE PE_NAME_CACHE_OP_RESULT
%token PE_PREFIX_MEM PE_PREFIX_RAW PE_PREFIX_GROUP
@@ -55,6 +55,7 @@ static inc_group_count(struct list_head *list,
%type <num> PE_TERM
%type <str> PE_NAME
%type <str> PE_BPF_OBJECT
+%type <str> PE_BPF_SOURCE
%type <str> PE_NAME_CACHE_TYPE
%type <str> PE_NAME_CACHE_OP_RESULT
%type <str> PE_MODIFIER_EVENT
@@ -461,7 +462,17 @@ PE_BPF_OBJECT
struct list_head *list;
ALLOC_LIST(list);
- ABORT_ON(parse_events_load_bpf(data, list, $1));
+ ABORT_ON(parse_events_load_bpf(data, list, $1, false));
+ $$ = list;
+}
+|
+PE_BPF_SOURCE
+{
+ struct parse_events_evlist *data = _data;
+ struct list_head *list;
+
+ ALLOC_LIST(list);
+ ABORT_ON(parse_events_load_bpf(data, list, $1, true));
$$ = list;
}
next prev parent reply other threads:[~2015-10-30 9:15 UTC|newest]
Thread overview: 92+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-14 12:41 [GIT PULL 00/31] perf tools: filtering events using eBPF programs Wang Nan
2015-10-14 12:41 ` [PATCH 01/31] perf tools: Make perf depend on libbpf Wang Nan
2015-10-29 12:21 ` [tip:perf/core] " tip-bot for Wang Nan
2015-10-14 12:41 ` [PATCH 02/31] perf ebpf: Add the libbpf glue Wang Nan
2015-10-29 12:21 ` [tip:perf/core] " tip-bot for Wang Nan
2015-10-14 12:41 ` [PATCH 03/31] perf tools: Enable passing bpf object file to --event Wang Nan
2015-10-20 15:12 ` Arnaldo Carvalho de Melo
2015-10-20 15:15 ` Arnaldo Carvalho de Melo
2015-10-20 15:42 ` Arnaldo Carvalho de Melo
2015-10-21 2:01 ` Wangnan (F)
2015-10-21 1:55 ` Wangnan (F)
2015-10-29 12:22 ` [tip:perf/core] " tip-bot for Wang Nan
2015-10-14 12:41 ` [PATCH 04/31] perf record, bpf: Create probe points for BPF programs Wang Nan
2015-10-20 19:12 ` Arnaldo Carvalho de Melo
2015-10-20 19:16 ` David Ahern
2015-10-20 19:21 ` Arnaldo Carvalho de Melo
2015-10-20 20:34 ` Arnaldo Carvalho de Melo
2015-10-21 2:27 ` Wangnan (F)
2015-10-21 3:31 ` Wangnan (F)
2015-10-21 13:28 ` Arnaldo Carvalho de Melo
2015-10-22 16:13 ` Arnaldo Carvalho de Melo
2015-10-29 12:22 ` [tip:perf/core] perf tools: " tip-bot for Wang Nan
2015-10-14 12:41 ` [PATCH 05/31] perf record: Load eBPF object into kernel Wang Nan
2015-10-23 16:58 ` Arnaldo Carvalho de Melo
2015-10-24 0:27 ` Arnaldo Carvalho de Melo
2015-10-26 7:18 ` Wangnan (F)
2015-10-24 1:18 ` pi3orama
2015-10-29 12:22 ` [tip:perf/core] perf tools: " tip-bot for Wang Nan
2015-10-14 12:41 ` [PATCH 06/31] perf tools: Collect perf_evsel in BPF object files Wang Nan
2015-10-29 12:23 ` [tip:perf/core] perf bpf: " tip-bot for Wang Nan
2015-10-14 12:41 ` [PATCH 07/31] perf tools: Attach eBPF program to perf event Wang Nan
2015-10-30 9:13 ` [tip:perf/core] perf bpf: Attach eBPF filter " tip-bot for Wang Nan
2015-10-14 12:41 ` [PATCH 08/31] perf record: Add clang options for compiling BPF scripts Wang Nan
2015-10-30 9:14 ` [tip:perf/core] " tip-bot for Wang Nan
2015-10-14 12:41 ` [PATCH 09/31] perf tools: Compile scriptlets to BPF objects when passing '.c' to --event Wang Nan
2015-10-14 15:45 ` Namhyung Kim
2015-10-15 2:10 ` Wangnan (F)
2015-10-29 16:25 ` Arnaldo Carvalho de Melo
2015-10-29 16:30 ` Arnaldo Carvalho de Melo
2015-10-29 22:52 ` Arnaldo Carvalho de Melo
2015-10-30 9:14 ` tip-bot for Wang Nan [this message]
2015-10-14 12:41 ` [PATCH 10/31] perf test: Enforce LLVM test for BPF test Wang Nan
2015-10-14 15:48 ` Namhyung Kim
2015-10-15 11:58 ` Wangnan (F)
2015-11-03 18:24 ` Arnaldo Carvalho de Melo
2015-11-04 1:41 ` Wangnan (F)
2015-10-29 22:37 ` Arnaldo Carvalho de Melo
2015-10-31 5:31 ` Wangnan (F)
2015-10-14 12:41 ` [PATCH 11/31] perf test: Add 'perf test BPF' Wang Nan
2015-10-14 12:41 ` [PATCH 12/31] perf probe: Reset args and nargs for probe_trace_event when failure Wang Nan
2015-10-29 22:39 ` Arnaldo Carvalho de Melo
2015-10-30 10:24 ` 平松雅巳 / HIRAMATU,MASAMI
2015-10-14 12:41 ` [PATCH 13/31] bpf tools: Load a program with different instances using preprocessor Wang Nan
2015-10-29 22:44 ` Arnaldo Carvalho de Melo
2015-10-31 10:40 ` Wangnan (F)
2015-10-14 12:41 ` [PATCH 14/31] perf tools: Add BPF_PROLOGUE config options for further patches Wang Nan
2015-10-29 22:45 ` Arnaldo Carvalho de Melo
2015-10-14 12:41 ` [PATCH 15/31] perf tools: Compile dwarf-regs.c if CONFIG_BPF_PROLOGUE is on Wang Nan
2015-10-14 12:41 ` [PATCH 16/31] perf tools: Add prologue for BPF programs for fetching arguments Wang Nan
2015-10-15 5:26 ` Namhyung Kim
2015-10-15 11:56 ` Wangnan (F)
2015-10-14 12:41 ` [PATCH 17/31] perf tools: Generate prologue for BPF programs Wang Nan
2015-10-14 12:41 ` [PATCH 18/31] perf tools: Use same BPF program if arguments are identical Wang Nan
2015-10-14 12:41 ` [PATCH 19/31] perf record: Support custom vmlinux path Wang Nan
2015-10-14 12:41 ` [PATCH 20/31] perf tools: Allow BPF program attach to uprobe events Wang Nan
2015-10-27 2:28 ` Wangnan (F)
2015-10-27 3:07 ` [PATCH] perf tools: Allow BPF program attach to modules Wang Nan
2015-10-14 12:41 ` [PATCH 21/31] perf test: Enforce LLVM test, add kbuild test Wang Nan
2015-10-19 14:42 ` Namhyung Kim
2015-10-19 14:53 ` Arnaldo Carvalho de Melo
2015-10-19 15:21 ` Namhyung Kim
2015-10-20 10:36 ` Wangnan (F)
2015-10-20 13:42 ` Arnaldo Carvalho de Melo
2015-10-20 12:06 ` Wangnan (F)
2015-10-20 13:41 ` Arnaldo Carvalho de Melo
2015-10-14 12:41 ` [PATCH 22/31] perf test: Test BPF prologue Wang Nan
2015-10-14 12:41 ` [PATCH 23/31] bpf tools: Add helper function for updating bpf maps elements Wang Nan
2015-10-14 12:41 ` [PATCH 24/31] bpf tools: Collect map definition in bpf_object Wang Nan
2015-10-14 12:41 ` [PATCH 25/31] bpf tools: Extract and collect map names from BPF object file Wang Nan
2015-10-14 12:41 ` [PATCH 26/31] perf tools: Support perf event alias name Wang Nan
2015-10-21 8:53 ` Namhyung Kim
2015-10-21 13:00 ` Wangnan (F)
2015-10-22 7:16 ` Namhyung Kim
2015-10-22 7:29 ` Wangnan (F)
2015-10-22 7:53 ` Namhyung Kim
2015-10-22 7:59 ` Wangnan (F)
2015-10-14 12:41 ` [PATCH 27/31] perf tools: Pass available CPU number to clang compiler Wang Nan
2015-10-14 12:41 ` [PATCH 28/31] perf tools: Add API to config maps in bpf object Wang Nan
2015-10-14 12:41 ` [PATCH 29/31] perf tools: Add API to apply config to BPF map Wang Nan
2015-10-14 12:41 ` [PATCH 30/31] perf record: Apply config to BPF objects before recording Wang Nan
2015-10-14 12:41 ` [PATCH 31/31] perf tools: Enable BPF object configure syntax Wang Nan
2015-10-14 15:44 ` [GIT PULL 00/31] perf tools: filtering events using eBPF programs Namhyung Kim
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