[PATCH 00/15] perf tools: some fixes and tweaks

[PATCH 00/15] perf tools: some fixes and tweaks

[Adrian Hunter]

Hi

Here are some fixes and tweaks to perf tools.


Adrian Hunter (15):
      perf tools: remove unused parameter
      perf tools: fix missing tool parameter
      perf tools: fix missing 'finished_round'
      perf tools: fix parse_events_terms() segfault on error path
      perf tools: fix new_term() missing free on error path
      perf tools: fix parse_events_terms() freeing local variable on error path
      perf tools: add const specifier to perf_pmu__find name parameter
      perf tools: tidy duplicated munmap code
      perf tools: validate perf event header size
      perf tools: add debug prints
      perf tools: fix symbol_conf.nr_events
      perf tools: allow non-matching sample types
      perf tools: struct thread has a tid not a pid
      perf tools: add pid to struct thread
      perf tools: fix ppid in thread__fork()

 tools/perf/builtin-inject.c    |  40 ++++++-------
 tools/perf/builtin-kmem.c      |   2 +-
 tools/perf/builtin-sched.c     |  12 ++--
 tools/perf/builtin-trace.c     |   4 +-
 tools/perf/ui/browsers/hists.c |   6 +-
 tools/perf/util/event.c        |   2 +-
 tools/perf/util/event.h        |   6 ++
 tools/perf/util/evlist.c       | 128 ++++++++++++++++++++++++++++++++++-------
 tools/perf/util/evlist.h       |   3 +
 tools/perf/util/evsel.c        |  93 ++++++++++++++++++++++++++++++
 tools/perf/util/evsel.h        |   4 ++
 tools/perf/util/header.c       |   8 ++-
 tools/perf/util/header.h       |   6 +-
 tools/perf/util/machine.c      |  57 +++++++++++++-----
 tools/perf/util/machine.h      |   8 ++-
 tools/perf/util/parse-events.c |   4 +-
 tools/perf/util/pmu.c          |  17 +++---
 tools/perf/util/pmu.h          |   2 +-
 tools/perf/util/session.c      |  25 ++++----
 tools/perf/util/sort.c         |   6 +-
 tools/perf/util/thread.c       |  11 ++--
 tools/perf/util/thread.h       |   5 +-
 tools/perf/util/tool.h         |   9 ++-
 23 files changed, 348 insertions(+), 110 deletions(-)


Regards
Adrian

[PATCH 01/15] perf tools: remove unused parameter

[Adrian Hunter]

'machine' is unused in 'perf_event__repipe_synth()' and some
callers pass NULL anyway.  So remove it.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
 tools/perf/builtin-inject.c | 19 +++++++++----------
 1 file changed, 9 insertions(+), 10 deletions(-)

diff --git a/tools/perf/builtin-inject.c b/tools/perf/builtin-inject.c
index 84ad6ab..f299ddf 100644
--- a/tools/perf/builtin-inject.c
+++ b/tools/perf/builtin-inject.c
@@ -38,8 +38,7 @@ struct event_entry {
 };
 
 static int perf_event__repipe_synth(struct perf_tool *tool,
-				    union perf_event *event,
-				    struct machine *machine __maybe_unused)
+				    union perf_event *event)
 {
 	struct perf_inject *inject = container_of(tool, struct perf_inject, tool);
 	uint32_t size;
@@ -65,20 +64,20 @@ static int perf_event__repipe_op2_synth(struct perf_tool *tool,
 					struct perf_session *session
 					__maybe_unused)
 {
-	return perf_event__repipe_synth(tool, event, NULL);
+	return perf_event__repipe_synth(tool, event);
 }
 
 static int perf_event__repipe_event_type_synth(struct perf_tool *tool,
 					       union perf_event *event)
 {
-	return perf_event__repipe_synth(tool, event, NULL);
+	return perf_event__repipe_synth(tool, event);
 }
 
 static int perf_event__repipe_tracing_data_synth(union perf_event *event,
 						 struct perf_session *session
 						 __maybe_unused)
 {
-	return perf_event__repipe_synth(NULL, event, NULL);
+	return perf_event__repipe_synth(NULL, event);
 }
 
 static int perf_event__repipe_attr(union perf_event *event,
@@ -89,15 +88,15 @@ static int perf_event__repipe_attr(union perf_event *event,
 	if (ret)
 		return ret;
 
-	return perf_event__repipe_synth(NULL, event, NULL);
+	return perf_event__repipe_synth(NULL, event);
 }
 
 static int perf_event__repipe(struct perf_tool *tool,
 			      union perf_event *event,
 			      struct perf_sample *sample __maybe_unused,
-			      struct machine *machine)
+			      struct machine *machine __maybe_unused)
 {
-	return perf_event__repipe_synth(tool, event, machine);
+	return perf_event__repipe_synth(tool, event);
 }
 
 typedef int (*inject_handler)(struct perf_tool *tool,
@@ -119,7 +118,7 @@ static int perf_event__repipe_sample(struct perf_tool *tool,
 
 	build_id__mark_dso_hit(tool, event, sample, evsel, machine);
 
-	return perf_event__repipe_synth(tool, event, machine);
+	return perf_event__repipe_synth(tool, event);
 }
 
 static int perf_event__repipe_mmap(struct perf_tool *tool,
@@ -153,7 +152,7 @@ static int perf_event__repipe_tracing_data(union perf_event *event,
 {
 	int err;
 
-	perf_event__repipe_synth(NULL, event, NULL);
+	perf_event__repipe_synth(NULL, event);
 	err = perf_event__process_tracing_data(event, session);
 
 	return err;
-- 
1.7.11.7

[PATCH 02/15] perf tools: fix missing tool parameter

[Adrian Hunter]

perf inject expects to get a reference to 'struct perf_inject'
from its 'tool' member.  For that to work, 'tool' needs to be
a parameter of all tool callbacks.  Make it so.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
 tools/perf/builtin-inject.c | 24 ++++++++++--------------
 tools/perf/util/header.c    |  6 ++++--
 tools/perf/util/header.h    |  6 ++++--
 tools/perf/util/session.c   | 11 +++++++----
 tools/perf/util/tool.h      |  9 ++++-----
 5 files changed, 29 insertions(+), 27 deletions(-)

diff --git a/tools/perf/builtin-inject.c b/tools/perf/builtin-inject.c
index f299ddf..fb341f1 100644
--- a/tools/perf/builtin-inject.c
+++ b/tools/perf/builtin-inject.c
@@ -73,22 +73,17 @@ static int perf_event__repipe_event_type_synth(struct perf_tool *tool,
 	return perf_event__repipe_synth(tool, event);
 }
 
-static int perf_event__repipe_tracing_data_synth(union perf_event *event,
-						 struct perf_session *session
-						 __maybe_unused)
-{
-	return perf_event__repipe_synth(NULL, event);
-}
-
-static int perf_event__repipe_attr(union perf_event *event,
-				   struct perf_evlist **pevlist __maybe_unused)
+static int perf_event__repipe_attr(struct perf_tool *tool,
+				   union perf_event *event,
+				   struct perf_evlist **pevlist)
 {
 	int ret;
-	ret = perf_event__process_attr(event, pevlist);
+
+	ret = perf_event__process_attr(tool, event, pevlist);
 	if (ret)
 		return ret;
 
-	return perf_event__repipe_synth(NULL, event);
+	return perf_event__repipe_synth(tool, event);
 }
 
 static int perf_event__repipe(struct perf_tool *tool,
@@ -147,13 +142,14 @@ static int perf_event__repipe_fork(struct perf_tool *tool,
 	return err;
 }
 
-static int perf_event__repipe_tracing_data(union perf_event *event,
+static int perf_event__repipe_tracing_data(struct perf_tool *tool,
+					   union perf_event *event,
 					   struct perf_session *session)
 {
 	int err;
 
 	perf_event__repipe_synth(NULL, event);
-	err = perf_event__process_tracing_data(event, session);
+	err = perf_event__process_tracing_data(tool, event, session);
 
 	return err;
 }
@@ -407,7 +403,7 @@ int cmd_inject(int argc, const char **argv, const char *prefix __maybe_unused)
 			.unthrottle	= perf_event__repipe,
 			.attr		= perf_event__repipe_attr,
 			.event_type	= perf_event__repipe_event_type_synth,
-			.tracing_data	= perf_event__repipe_tracing_data_synth,
+			.tracing_data	= perf_event__repipe_op2_synth,
 			.build_id	= perf_event__repipe_op2_synth,
 		},
 		.input_name  = "-",
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 738d3b8..4037b0a 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -2933,7 +2933,8 @@ int perf_event__synthesize_attrs(struct perf_tool *tool,
 	return err;
 }
 
-int perf_event__process_attr(union perf_event *event,
+int perf_event__process_attr(struct perf_tool *tool __maybe_unused,
+			     union perf_event *event,
 			     struct perf_evlist **pevlist)
 {
 	u32 i, ids, n_ids;
@@ -3074,7 +3075,8 @@ int perf_event__synthesize_tracing_data(struct perf_tool *tool, int fd,
 	return aligned_size;
 }
 
-int perf_event__process_tracing_data(union perf_event *event,
+int perf_event__process_tracing_data(struct perf_tool *tool __maybe_unused,
+				     union perf_event *event,
 				     struct perf_session *session)
 {
 	ssize_t size_read, padding, size = event->tracing_data.size;
diff --git a/tools/perf/util/header.h b/tools/perf/util/header.h
index 16a3e83..2d1ca7d 100644
--- a/tools/perf/util/header.h
+++ b/tools/perf/util/header.h
@@ -130,7 +130,8 @@ int perf_event__synthesize_attr(struct perf_tool *tool,
 int perf_event__synthesize_attrs(struct perf_tool *tool,
 				 struct perf_session *session,
 				 perf_event__handler_t process);
-int perf_event__process_attr(union perf_event *event, struct perf_evlist **pevlist);
+int perf_event__process_attr(struct perf_tool *tool, union perf_event *event,
+			     struct perf_evlist **pevlist);
 
 int perf_event__synthesize_event_type(struct perf_tool *tool,
 				      u64 event_id, char *name,
@@ -145,7 +146,8 @@ int perf_event__process_event_type(struct perf_tool *tool,
 int perf_event__synthesize_tracing_data(struct perf_tool *tool,
 					int fd, struct perf_evlist *evlist,
 					perf_event__handler_t process);
-int perf_event__process_tracing_data(union perf_event *event,
+int perf_event__process_tracing_data(struct perf_tool *tool,
+				     union perf_event *event,
 				     struct perf_session *session);
 
 int perf_event__synthesize_build_id(struct perf_tool *tool,
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index cf1fe01..19ea888 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -193,7 +193,9 @@ void perf_session__delete(struct perf_session *self)
 	vdso__exit();
 }
 
-static int process_event_synth_tracing_data_stub(union perf_event *event
+static int process_event_synth_tracing_data_stub(struct perf_tool *tool
+						 __maybe_unused,
+						 union perf_event *event
 						 __maybe_unused,
 						 struct perf_session *session
 						__maybe_unused)
@@ -202,7 +204,8 @@ static int process_event_synth_tracing_data_stub(union perf_event *event
 	return 0;
 }
 
-static int process_event_synth_attr_stub(union perf_event *event __maybe_unused,
+static int process_event_synth_attr_stub(struct perf_tool *tool __maybe_unused,
+					 union perf_event *event __maybe_unused,
 					 struct perf_evlist **pevlist
 					 __maybe_unused)
 {
@@ -921,7 +924,7 @@ static int perf_session__process_user_event(struct perf_session *session, union
 	/* These events are processed right away */
 	switch (event->header.type) {
 	case PERF_RECORD_HEADER_ATTR:
-		err = tool->attr(event, &session->evlist);
+		err = tool->attr(tool, event, &session->evlist);
 		if (err == 0)
 			perf_session__set_id_hdr_size(session);
 		return err;
@@ -930,7 +933,7 @@ static int perf_session__process_user_event(struct perf_session *session, union
 	case PERF_RECORD_HEADER_TRACING_DATA:
 		/* setup for reading amidst mmap */
 		lseek(session->fd, file_offset, SEEK_SET);
-		return tool->tracing_data(event, session);
+		return tool->tracing_data(tool, event, session);
 	case PERF_RECORD_HEADER_BUILD_ID:
 		return tool->build_id(tool, event, session);
 	case PERF_RECORD_FINISHED_ROUND:
diff --git a/tools/perf/util/tool.h b/tools/perf/util/tool.h
index b0e1aad..88f8cbd 100644
--- a/tools/perf/util/tool.h
+++ b/tools/perf/util/tool.h
@@ -18,12 +18,11 @@ typedef int (*event_sample)(struct perf_tool *tool, union perf_event *event,
 typedef int (*event_op)(struct perf_tool *tool, union perf_event *event,
 			struct perf_sample *sample, struct machine *machine);
 
-typedef int (*event_attr_op)(union perf_event *event,
+typedef int (*event_attr_op)(struct perf_tool *tool,
+			     union perf_event *event,
 			     struct perf_evlist **pevlist);
-typedef int (*event_simple_op)(struct perf_tool *tool, union perf_event *event);
 
-typedef int (*event_synth_op)(union perf_event *event,
-			      struct perf_session *session);
+typedef int (*event_simple_op)(struct perf_tool *tool, union perf_event *event);
 
 typedef int (*event_op2)(struct perf_tool *tool, union perf_event *event,
 			 struct perf_session *session);
@@ -39,7 +38,7 @@ struct perf_tool {
 			throttle,
 			unthrottle;
 	event_attr_op	attr;
-	event_synth_op	tracing_data;
+	event_op2	tracing_data;
 	event_simple_op	event_type;
 	event_op2	finished_round,
 			build_id;
-- 
1.7.11.7

[PATCH 03/15] perf tools: fix missing 'finished_round'

[Adrian Hunter]

By default, perf inject should "repipe" all events
including 'finished_round'.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
 tools/perf/builtin-inject.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/perf/builtin-inject.c b/tools/perf/builtin-inject.c
index fb341f1..c9270d9 100644
--- a/tools/perf/builtin-inject.c
+++ b/tools/perf/builtin-inject.c
@@ -404,6 +404,7 @@ int cmd_inject(int argc, const char **argv, const char *prefix __maybe_unused)
 			.attr		= perf_event__repipe_attr,
 			.event_type	= perf_event__repipe_event_type_synth,
 			.tracing_data	= perf_event__repipe_op2_synth,
+			.finished_round	= perf_event__repipe_op2_synth,
 			.build_id	= perf_event__repipe_op2_synth,
 		},
 		.input_name  = "-",
-- 
1.7.11.7

[PATCH 04/15] perf tools: fix parse_events_terms() segfault on error path

[Adrian Hunter]

On the error path, 'data.terms' may not have been
initialised.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
 tools/perf/util/parse-events.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 6c8bb0f..d8dcb8d 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -860,7 +860,8 @@ int parse_events_terms(struct list_head *terms, const char *str)
 		return 0;
 	}
 
-	parse_events__free_terms(data.terms);
+	if (data.terms)
+		parse_events__free_terms(data.terms);
 	return ret;
 }
 
-- 
1.7.11.7

[PATCH 05/15] perf tools: fix new_term() missing free on error path

[Adrian Hunter]

On the error path, newly allocated 'term' must be freed.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
 tools/perf/util/parse-events.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index d8dcb8d..995fc25 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -1184,6 +1184,7 @@ static int new_term(struct parse_events_term **_term, int type_val,
 		term->val.str = str;
 		break;
 	default:
+		free(term);
 		return -EINVAL;
 	}
 
-- 
1.7.11.7

[PATCH 06/15] perf tools: fix parse_events_terms() freeing local variable on error path

[Adrian Hunter]

The list_head is on the stack, so just free the rest of the list.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
 tools/perf/util/pmu.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index 4c6f9c4..def64d4 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -194,7 +194,8 @@ static int pmu_alias_terms(struct perf_pmu_alias *alias,
 	list_for_each_entry(term, &alias->terms, list) {
 		ret = parse_events_term__clone(&clone, term);
 		if (ret) {
-			parse_events__free_terms(&list);
+			list_for_each_entry_safe(term, clone, &list, list)
+				free(term);
 			return ret;
 		}
 		list_add_tail(&clone->list, &list);
-- 
1.7.11.7

[PATCH 07/15] perf tools: add const specifier to perf_pmu__find name parameter

[Adrian Hunter]

The name parameter is constant, declare it so.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
 tools/perf/util/pmu.c | 14 +++++++-------
 tools/perf/util/pmu.h |  2 +-
 2 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index def64d4..98b993ee 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -73,7 +73,7 @@ int perf_pmu__format_parse(char *dir, struct list_head *head)
  * located at:
  * /sys/bus/event_source/devices/<dev>/format as sysfs group attributes.
  */
-static int pmu_format(char *name, struct list_head *format)
+static int pmu_format(const char *name, struct list_head *format)
 {
 	struct stat st;
 	char path[PATH_MAX];
@@ -162,7 +162,7 @@ static int pmu_aliases_parse(char *dir, struct list_head *head)
  * Reading the pmu event aliases definition, which should be located at:
  * /sys/bus/event_source/devices/<dev>/events as sysfs group attributes.
  */
-static int pmu_aliases(char *name, struct list_head *head)
+static int pmu_aliases(const char *name, struct list_head *head)
 {
 	struct stat st;
 	char path[PATH_MAX];
@@ -209,7 +209,7 @@ static int pmu_alias_terms(struct perf_pmu_alias *alias,
  * located at:
  * /sys/bus/event_source/devices/<dev>/type as sysfs attribute.
  */
-static int pmu_type(char *name, __u32 *type)
+static int pmu_type(const char *name, __u32 *type)
 {
 	struct stat st;
 	char path[PATH_MAX];
@@ -267,7 +267,7 @@ static void pmu_read_sysfs(void)
 	closedir(dir);
 }
 
-static struct cpu_map *pmu_cpumask(char *name)
+static struct cpu_map *pmu_cpumask(const char *name)
 {
 	struct stat st;
 	char path[PATH_MAX];
@@ -294,7 +294,7 @@ static struct cpu_map *pmu_cpumask(char *name)
 	return cpus;
 }
 
-static struct perf_pmu *pmu_lookup(char *name)
+static struct perf_pmu *pmu_lookup(const char *name)
 {
 	struct perf_pmu *pmu;
 	LIST_HEAD(format);
@@ -331,7 +331,7 @@ static struct perf_pmu *pmu_lookup(char *name)
 	return pmu;
 }
 
-static struct perf_pmu *pmu_find(char *name)
+static struct perf_pmu *pmu_find(const char *name)
 {
 	struct perf_pmu *pmu;
 
@@ -357,7 +357,7 @@ struct perf_pmu *perf_pmu__scan(struct perf_pmu *pmu)
 	return NULL;
 }
 
-struct perf_pmu *perf_pmu__find(char *name)
+struct perf_pmu *perf_pmu__find(const char *name)
 {
 	struct perf_pmu *pmu;
 
diff --git a/tools/perf/util/pmu.h b/tools/perf/util/pmu.h
index 32fe55b..d17b565 100644
--- a/tools/perf/util/pmu.h
+++ b/tools/perf/util/pmu.h
@@ -21,7 +21,7 @@ struct perf_pmu {
 	struct list_head list;
 };
 
-struct perf_pmu *perf_pmu__find(char *name);
+struct perf_pmu *perf_pmu__find(const char *name);
 int perf_pmu__config(struct perf_pmu *pmu, struct perf_event_attr *attr,
 		     struct list_head *head_terms);
 int perf_pmu__config_terms(struct list_head *formats,
-- 
1.7.11.7

[PATCH 08/15] perf tools: tidy duplicated munmap code

[Adrian Hunter]

The same lines of code are used in three places.
Make it a new function '__perf_evlist__munmap()'.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
 tools/perf/util/evlist.c | 32 ++++++++++++++------------------
 1 file changed, 14 insertions(+), 18 deletions(-)

diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 99b43dd..3c8b569 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -403,16 +403,20 @@ union perf_event *perf_evlist__mmap_read(struct perf_evlist *evlist, int idx)
 	return event;
 }
 
+static void __perf_evlist__munmap(struct perf_evlist *evlist, int idx)
+{
+	if (evlist->mmap[idx].base != NULL) {
+		munmap(evlist->mmap[idx].base, evlist->mmap_len);
+		evlist->mmap[idx].base = NULL;
+	}
+}
+
 void perf_evlist__munmap(struct perf_evlist *evlist)
 {
 	int i;
 
-	for (i = 0; i < evlist->nr_mmaps; i++) {
-		if (evlist->mmap[i].base != NULL) {
-			munmap(evlist->mmap[i].base, evlist->mmap_len);
-			evlist->mmap[i].base = NULL;
-		}
-	}
+	for (i = 0; i < evlist->nr_mmaps; i++)
+		__perf_evlist__munmap(evlist, i);
 
 	free(evlist->mmap);
 	evlist->mmap = NULL;
@@ -477,12 +481,8 @@ static int perf_evlist__mmap_per_cpu(struct perf_evlist *evlist, int prot, int m
 	return 0;
 
 out_unmap:
-	for (cpu = 0; cpu < nr_cpus; cpu++) {
-		if (evlist->mmap[cpu].base != NULL) {
-			munmap(evlist->mmap[cpu].base, evlist->mmap_len);
-			evlist->mmap[cpu].base = NULL;
-		}
-	}
+	for (cpu = 0; cpu < nr_cpus; cpu++)
+		__perf_evlist__munmap(evlist, cpu);
 	return -1;
 }
 
@@ -517,12 +517,8 @@ static int perf_evlist__mmap_per_thread(struct perf_evlist *evlist, int prot, in
 	return 0;
 
 out_unmap:
-	for (thread = 0; thread < nr_threads; thread++) {
-		if (evlist->mmap[thread].base != NULL) {
-			munmap(evlist->mmap[thread].base, evlist->mmap_len);
-			evlist->mmap[thread].base = NULL;
-		}
-	}
+	for (thread = 0; thread < nr_threads; thread++)
+		__perf_evlist__munmap(evlist, thread);
 	return -1;
 }
 
-- 
1.7.11.7

[PATCH 09/15] perf tools: validate perf event header size

[Adrian Hunter]

'size' includes the header so must be at least
'sizeof(struct perf_event_header)'.  Error out
immediately if that is not the case.  Also
don't byte-swap the header until it is actually
"fetched" from the mmap region.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
 tools/perf/util/session.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 19ea888..7e0d605 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -1094,8 +1094,10 @@ more:
 		perf_event_header__bswap(&event->header);
 
 	size = event->header.size;
-	if (size == 0)
-		size = 8;
+	if (size < sizeof(struct perf_event_header)) {
+		pr_err("bad event header size\n");
+		goto out_err;
+	}
 
 	if (size > cur_size) {
 		void *new = realloc(buf, size);
@@ -1161,12 +1163,12 @@ fetch_mmaped_event(struct perf_session *session,
 
 	event = (union perf_event *)(buf + head);
 
-	if (session->header.needs_swap)
-		perf_event_header__bswap(&event->header);
-
 	if (head + event->header.size > mmap_size)
 		return NULL;
 
+	if (session->header.needs_swap)
+		perf_event_header__bswap(&event->header);
+
 	return event;
 }
 
@@ -1245,7 +1247,7 @@ more:
 
 	size = event->header.size;
 
-	if (size == 0 ||
+	if (size < sizeof(struct perf_event_header) ||
 	    perf_session__process_event(session, event, tool, file_pos) < 0) {
 		pr_err("%#" PRIx64 " [%#x]: failed to process type: %d\n",
 		       file_offset + head, event->header.size,
-- 
1.7.11.7

[PATCH 10/15] perf tools: add debug prints

[Adrian Hunter]

It is useful to see the arguments to perf_event_open
and whether the perf events ring buffer was mmapped
per-cpu or per-thread.  That information will now be
displayed when verbose is 2 i.e option -vv

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
 tools/perf/util/evlist.c |  3 +++
 tools/perf/util/evsel.c  | 52 ++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 55 insertions(+)

diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 3c8b569..a660f56 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -14,6 +14,7 @@
 #include "target.h"
 #include "evlist.h"
 #include "evsel.h"
+#include "debug.h"
 #include <unistd.h>
 
 #include "parse-events.h"
@@ -454,6 +455,7 @@ static int perf_evlist__mmap_per_cpu(struct perf_evlist *evlist, int prot, int m
 	int nr_cpus = cpu_map__nr(evlist->cpus);
 	int nr_threads = thread_map__nr(evlist->threads);
 
+	pr_debug2("perf event ring buffer mmapped per cpu\n");
 	for (cpu = 0; cpu < nr_cpus; cpu++) {
 		int output = -1;
 
@@ -492,6 +494,7 @@ static int perf_evlist__mmap_per_thread(struct perf_evlist *evlist, int prot, in
 	int thread;
 	int nr_threads = thread_map__nr(evlist->threads);
 
+	pr_debug2("perf event ring buffer mmapped per thread\n");
 	for (thread = 0; thread < nr_threads; thread++) {
 		int output = -1;
 
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 63b6f8c..d01d2cd 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -21,6 +21,7 @@
 #include <linux/hw_breakpoint.h>
 #include <linux/perf_event.h>
 #include "perf_regs.h"
+#include "debug.h"
 
 static struct {
 	bool sample_id_all;
@@ -817,6 +818,54 @@ static int get_group_fd(struct perf_evsel *evsel, int cpu, int thread)
 	return fd;
 }
 
+static void show_attr(struct perf_event_attr *attr)
+{
+	pr_debug2("------------------------------------------------------------\n");
+	pr_debug2("perf_event_attr:\n");
+	pr_debug2("  type                %u\n", attr->type);
+	pr_debug2("  size                %u\n", attr->size);
+	pr_debug2("  config              %#"PRIx64"\n", (uint64_t)attr->config);
+	pr_debug2("  sample_period       %"PRIu64"\n", (uint64_t)attr->sample_period);
+	pr_debug2("  sample_freq         %"PRIu64"\n", (uint64_t)attr->sample_freq);
+	pr_debug2("  sample_type         %#"PRIx64"\n", (uint64_t)attr->sample_type);
+	pr_debug2("  read_format         %#"PRIx64"\n", (uint64_t)attr->read_format);
+
+	pr_debug2("  disabled            %u    ", attr->disabled);
+	pr_debug2("inherit             %u\n", attr->inherit);
+	pr_debug2("  pinned              %u    ", attr->pinned);
+	pr_debug2("exclusive           %u\n", attr->exclusive);
+	pr_debug2("  exclude_user        %u    ", attr->exclude_user);
+	pr_debug2("exclude_kernel      %u\n", attr->exclude_kernel);
+	pr_debug2("  exclude_hv          %u    ", attr->exclude_hv);
+	pr_debug2("exclude_idle        %u\n", attr->exclude_idle);
+	pr_debug2("  mmap                %u    ", attr->mmap);
+	pr_debug2("comm                %u\n", attr->comm);
+	pr_debug2("  freq                %u    ", attr->freq);
+	pr_debug2("inherit_stat        %u\n", attr->inherit_stat);
+	pr_debug2("  enable_on_exec      %u    ", attr->enable_on_exec);
+	pr_debug2("task                %u\n", attr->task);
+	pr_debug2("  watermark           %u    ", attr->watermark);
+	pr_debug2("precise_ip          %u\n", attr->precise_ip);
+	pr_debug2("  mmap_data           %u    ", attr->mmap_data);
+	pr_debug2("sample_id_all       %u\n", attr->sample_id_all);
+	pr_debug2("  exclude_host        %u    ", attr->exclude_host);
+	pr_debug2("exclude_guest       %u\n", attr->exclude_guest);
+	pr_debug2("  excl.callchain.kern %u    ", attr->exclude_callchain_kernel);
+	pr_debug2("excl.callchain.user %u\n", attr->exclude_callchain_user);
+
+	pr_debug2("  wakeup_events       %u\n", attr->wakeup_events);
+	pr_debug2("  wakeup_watermark    %u\n", attr->wakeup_watermark);
+	pr_debug2("  bp_type             %#x\n", attr->bp_type);
+	pr_debug2("  bp_addr             %#"PRIx64"\n", (uint64_t)attr->bp_addr);
+	pr_debug2("  config1             %#"PRIx64"\n", (uint64_t)attr->config1);
+	pr_debug2("  bp_len              %"PRIu64"\n", (uint64_t)attr->bp_len);
+	pr_debug2("  config2             %#"PRIx64"\n", (uint64_t)attr->config2);
+	pr_debug2("  branch_sample_type  %#"PRIx64"\n", (uint64_t)attr->branch_sample_type);
+	pr_debug2("  sample_regs_user    %#"PRIx64"\n", (uint64_t)attr->sample_regs_user);
+	pr_debug2("  sample_stack_user   %u\n", attr->sample_stack_user);
+	pr_debug2("------------------------------------------------------------\n");
+}
+
 static int __perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
 			      struct thread_map *threads)
 {
@@ -840,6 +889,7 @@ retry_sample_id:
 	if (perf_missing_features.sample_id_all)
 		evsel->attr.sample_id_all = 0;
 
+	show_attr(&evsel->attr);
 	for (cpu = 0; cpu < cpus->nr; cpu++) {
 
 		for (thread = 0; thread < threads->nr; thread++) {
@@ -850,6 +900,8 @@ retry_sample_id:
 
 			group_fd = get_group_fd(evsel, cpu, thread);
 
+			pr_debug2("perf_event_open: pid %d  cpu %d  group_fd %d  flags %#lx\n",
+				  pid, cpus->map[cpu], group_fd, flags);
 			FD(evsel, cpu, thread) = sys_perf_event_open(&evsel->attr,
 								     pid,
 								     cpus->map[cpu],
-- 
1.7.11.7

[PATCH 11/15] perf tools: fix symbol_conf.nr_events

[Adrian Hunter]

symbol_conf.nr_events must be updated when processing
attribute events.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
 tools/perf/util/header.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 4037b0a..81a3a0d 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -2968,6 +2968,8 @@ int perf_event__process_attr(struct perf_tool *tool __maybe_unused,
 		perf_evlist__id_add(evlist, evsel, 0, i, event->attr.id[i]);
 	}
 
+	symbol_conf.nr_events = evlist->nr_entries;
+
 	return 0;
 }
 
-- 
1.7.11.7

[PATCH 12/15] perf tools: allow non-matching sample types

[Adrian Hunter]

Sample types need not be identical to determine
the sample id from the event.  Only the position
of the sample id needs to be the same.

Compatible sample types are ones in which the bits
defined by PERF_COMPAT_MASK are the same.
'perf_evlist__config()' forces sample types to be
compatible on that basis.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
 tools/perf/util/event.h  |  6 ++++
 tools/perf/util/evlist.c | 93 ++++++++++++++++++++++++++++++++++++++++++++++--
 tools/perf/util/evlist.h |  3 ++
 tools/perf/util/evsel.c  | 41 +++++++++++++++++++++
 tools/perf/util/evsel.h  |  4 +++
 5 files changed, 145 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
index 1813895..858572f 100644
--- a/tools/perf/util/event.h
+++ b/tools/perf/util/event.h
@@ -65,6 +65,12 @@ struct read_event {
 	PERF_SAMPLE_ID | PERF_SAMPLE_STREAM_ID |	\
 	 PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD)
 
+#define PERF_COMPAT_MASK				\
+	(PERF_SAMPLE_IP   | PERF_SAMPLE_TID       |	\
+	 PERF_SAMPLE_TIME | PERF_SAMPLE_ADDR      |	\
+	 PERF_SAMPLE_ID   | PERF_SAMPLE_STREAM_ID |	\
+	 PERF_SAMPLE_CPU)
+
 struct sample_event {
 	struct perf_event_header        header;
 	u64 array[];
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index a660f56..85c4d91 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -49,10 +49,20 @@ struct perf_evlist *perf_evlist__new(void)
 	return evlist;
 }
 
+static void perf_evlist__set_id_pos(struct perf_evlist *evlist)
+{
+	struct perf_evsel *first = perf_evlist__first(evlist);
+
+	evlist->id_pos = first->id_pos;
+	evlist->is_pos = first->is_pos;
+}
+
 void perf_evlist__config(struct perf_evlist *evlist,
 			struct perf_record_opts *opts)
 {
 	struct perf_evsel *evsel;
+	u64 compat = 0;
+
 	/*
 	 * Set the evsel leader links before we configure attributes,
 	 * since some might depend on this info.
@@ -68,7 +78,15 @@ void perf_evlist__config(struct perf_evlist *evlist,
 
 		if (evlist->nr_entries > 1)
 			perf_evsel__set_sample_id(evsel);
+		compat |= evsel->attr.sample_type & PERF_COMPAT_MASK;
 	}
+
+	list_for_each_entry(evsel, &evlist->entries, node) {
+		evsel->attr.sample_type |= compat;
+		perf_evsel__calc_id_pos(evsel);
+	}
+
+	perf_evlist__set_id_pos(evlist);
 }
 
 static void perf_evlist__purge(struct perf_evlist *evlist)
@@ -102,6 +120,7 @@ void perf_evlist__add(struct perf_evlist *evlist, struct perf_evsel *entry)
 {
 	list_add_tail(&entry->node, &evlist->entries);
 	++evlist->nr_entries;
+	perf_evlist__set_id_pos(evlist);
 }
 
 void perf_evlist__splice_list_tail(struct perf_evlist *evlist,
@@ -110,6 +129,7 @@ void perf_evlist__splice_list_tail(struct perf_evlist *evlist,
 {
 	list_splice_tail(list, &evlist->entries);
 	evlist->nr_entries += nr_entries;
+	perf_evlist__set_id_pos(evlist);
 }
 
 void __perf_evlist__set_leader(struct list_head *list)
@@ -339,6 +359,55 @@ struct perf_evsel *perf_evlist__id2evsel(struct perf_evlist *evlist, u64 id)
 	return NULL;
 }
 
+static int perf_evlist__event2id(struct perf_evlist *evlist,
+				 union perf_event *event, u64 *id)
+{
+	const u64 *array = event->sample.array;
+	ssize_t n;
+
+	n = (event->header.size - sizeof(event->header)) >> 3;
+
+	if (event->header.type == PERF_RECORD_SAMPLE) {
+		if (evlist->id_pos >= n)
+			return -1;
+		*id = array[evlist->id_pos];
+	} else {
+		if (evlist->is_pos >= n)
+			return -1;
+		n -= evlist->is_pos;
+		*id = array[n];
+	}
+	return 0;
+}
+
+static struct perf_evsel *perf_evlist__event2evsel(struct perf_evlist *evlist,
+						   union perf_event *event)
+{
+	struct hlist_head *head;
+	struct perf_sample_id *sid;
+	int hash;
+	u64 id;
+
+	if (evlist->nr_entries == 1 || evlist->matching_sample_types)
+		return perf_evlist__first(evlist);
+
+	if (perf_evlist__event2id(evlist, event, &id))
+		return NULL;
+
+	/* Synthesized events have an id of zero */
+	if (!id)
+		return perf_evlist__first(evlist);
+
+	hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
+	head = &evlist->heads[hash];
+
+	hlist_for_each_entry(sid, head, node) {
+		if (sid->id == id)
+			return sid->evsel;
+	}
+	return NULL;
+}
+
 union perf_event *perf_evlist__mmap_read(struct perf_evlist *evlist, int idx)
 {
 	struct perf_mmap *md = &evlist->mmap[idx];
@@ -650,9 +719,26 @@ int perf_evlist__set_filter(struct perf_evlist *evlist, const char *filter)
 bool perf_evlist__valid_sample_type(struct perf_evlist *evlist)
 {
 	struct perf_evsel *first = perf_evlist__first(evlist), *pos = first;
+	bool ok = true;
 
 	list_for_each_entry_continue(pos, &evlist->entries, node) {
-		if (first->attr.sample_type != pos->attr.sample_type)
+		if (first->attr.sample_type != pos->attr.sample_type) {
+			ok = false;
+			break;
+		}
+	}
+
+	if (ok) {
+		evlist->matching_sample_types = true;
+		return true;
+	}
+
+	if (evlist->id_pos < 0 || evlist->is_pos < 0)
+		return false;
+
+	list_for_each_entry(pos, &evlist->entries, node) {
+		if (pos->id_pos != evlist->id_pos ||
+		    pos->is_pos != evlist->is_pos)
 			return false;
 	}
 
@@ -848,7 +934,10 @@ int perf_evlist__start_workload(struct perf_evlist *evlist)
 int perf_evlist__parse_sample(struct perf_evlist *evlist, union perf_event *event,
 			      struct perf_sample *sample)
 {
-	struct perf_evsel *evsel = perf_evlist__first(evlist);
+	struct perf_evsel *evsel = perf_evlist__event2evsel(evlist, event);
+
+	if (!evsel)
+		return -EFAULT;
 	return perf_evsel__parse_sample(evsel, event, sample);
 }
 
diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h
index 0583d36..bfcbf67 100644
--- a/tools/perf/util/evlist.h
+++ b/tools/perf/util/evlist.h
@@ -32,11 +32,14 @@ struct perf_evlist {
 	int		 nr_fds;
 	int		 nr_mmaps;
 	int		 mmap_len;
+	int		 id_pos;
+	int		 is_pos;
 	struct {
 		int	cork_fd;
 		pid_t	pid;
 	} workload;
 	bool		 overwrite;
+	bool		 matching_sample_types;
 	struct perf_mmap *mmap;
 	struct pollfd	 *pollfd;
 	struct thread_map *threads;
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index d01d2cd..ee0f894 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -46,6 +46,46 @@ static int __perf_evsel__sample_size(u64 sample_type)
 	return size;
 }
 
+static int __perf_evsel__calc_id_pos(u64 sample_type)
+{
+	u64 mask;
+	int i, idx;
+
+	if (!(sample_type & PERF_SAMPLE_ID))
+		return -1;
+
+	mask = sample_type & (PERF_SAMPLE_ID - 1);
+
+	for (i = 0, idx = 0; i < 64; i++) {
+		if (mask & (1ULL << i))
+			idx++;
+	}
+
+	return idx;
+}
+
+static int __perf_evsel__calc_is_pos(u64 sample_type)
+{
+	int idx = 1;
+
+	if (!(sample_type & PERF_SAMPLE_ID))
+		return -1;
+
+	if (sample_type & PERF_SAMPLE_CPU)
+		idx += 1;
+
+	if (sample_type & PERF_SAMPLE_STREAM_ID)
+		idx += 1;
+
+	return idx;
+}
+
+void perf_evsel__calc_id_pos(struct perf_evsel *evsel)
+{
+	evsel->id_pos = __perf_evsel__calc_id_pos(evsel->attr.sample_type);
+	evsel->is_pos = __perf_evsel__calc_is_pos(evsel->attr.sample_type);
+}
+
 void hists__init(struct hists *hists)
 {
 	memset(hists, 0, sizeof(*hists));
@@ -89,6 +129,7 @@ void perf_evsel__init(struct perf_evsel *evsel,
 	INIT_LIST_HEAD(&evsel->node);
 	hists__init(&evsel->hists);
 	evsel->sample_size = __perf_evsel__sample_size(attr->sample_type);
+	perf_evsel__calc_id_pos(evsel);
 }
 
 struct perf_evsel *perf_evsel__new(struct perf_event_attr *attr, int idx)
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index 3f156cc..88b4319 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -71,6 +71,8 @@ struct perf_evsel {
 	} handler;
 	struct cpu_map		*cpus;
 	unsigned int		sample_size;
+	int			id_pos;
+	int			is_pos;
 	bool 			supported;
 	bool 			needs_swap;
 	/* parse modifier helper */
@@ -100,6 +102,8 @@ void perf_evsel__delete(struct perf_evsel *evsel);
 void perf_evsel__config(struct perf_evsel *evsel,
 			struct perf_record_opts *opts);
 
+void perf_evsel__calc_id_pos(struct perf_evsel *evsel);
+
 bool perf_evsel__is_cache_op_valid(u8 type, u8 op);
 
 #define PERF_EVSEL__MAX_ALIASES 8
-- 
1.7.11.7

[PATCH 13/15] perf tools: struct thread has a tid not a pid

[Adrian Hunter]

As evident from 'machine__process_fork_event()' and
'machine__process_exit_event()' the 'pid' member of
struct thread is actually the tid.

Rename 'pid' to 'tid' in struct thread accordingly.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
 tools/perf/builtin-kmem.c      |  2 +-
 tools/perf/builtin-sched.c     | 12 ++++++------
 tools/perf/builtin-trace.c     |  4 ++--
 tools/perf/ui/browsers/hists.c |  6 +++---
 tools/perf/util/event.c        |  2 +-
 tools/perf/util/machine.c      | 20 ++++++++++----------
 tools/perf/util/machine.h      |  4 ++--
 tools/perf/util/sort.c         |  6 +++---
 tools/perf/util/thread.c       | 10 +++++-----
 tools/perf/util/thread.h       |  4 ++--
 10 files changed, 35 insertions(+), 35 deletions(-)

diff --git a/tools/perf/builtin-kmem.c b/tools/perf/builtin-kmem.c
index 46878da..34647fa 100644
--- a/tools/perf/builtin-kmem.c
+++ b/tools/perf/builtin-kmem.c
@@ -313,7 +313,7 @@ static int process_sample_event(struct perf_tool *tool __maybe_unused,
 		return -1;
 	}
 
-	dump_printf(" ... thread: %s:%d\n", thread->comm, thread->pid);
+	dump_printf(" ... thread: %s:%d\n", thread->comm, thread->tid);
 
 	if (evsel->handler.func != NULL) {
 		tracepoint_handler f = evsel->handler.func;
diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
index 2da2a6c..b1715f4 100644
--- a/tools/perf/builtin-sched.c
+++ b/tools/perf/builtin-sched.c
@@ -1075,7 +1075,7 @@ static int latency_migrate_task_event(struct perf_sched *sched,
 	if (!atoms) {
 		if (thread_atoms_insert(sched, migrant))
 			return -1;
-		register_pid(sched, migrant->pid, migrant->comm);
+		register_pid(sched, migrant->tid, migrant->comm);
 		atoms = thread_atoms_search(&sched->atom_root, migrant, &sched->cmp_pid);
 		if (!atoms) {
 			pr_err("migration-event: Internal tree error");
@@ -1115,7 +1115,7 @@ static void output_lat_thread(struct perf_sched *sched, struct work_atoms *work_
 	sched->all_runtime += work_list->total_runtime;
 	sched->all_count   += work_list->nb_atoms;
 
-	ret = printf("  %s:%d ", work_list->thread->comm, work_list->thread->pid);
+	ret = printf("  %s:%d ", work_list->thread->comm, work_list->thread->tid);
 
 	for (i = 0; i < 24 - ret; i++)
 		printf(" ");
@@ -1131,9 +1131,9 @@ static void output_lat_thread(struct perf_sched *sched, struct work_atoms *work_
 
 static int pid_cmp(struct work_atoms *l, struct work_atoms *r)
 {
-	if (l->thread->pid < r->thread->pid)
+	if (l->thread->tid < r->thread->tid)
 		return -1;
-	if (l->thread->pid > r->thread->pid)
+	if (l->thread->tid > r->thread->tid)
 		return 1;
 
 	return 0;
@@ -1321,7 +1321,7 @@ static int map_switch_event(struct perf_sched *sched, struct perf_evsel *evsel,
 			printf("*");
 
 		if (sched->curr_thread[cpu]) {
-			if (sched->curr_thread[cpu]->pid)
+			if (sched->curr_thread[cpu]->tid)
 				printf("%2s ", sched->curr_thread[cpu]->shortname);
 			else
 				printf(".  ");
@@ -1332,7 +1332,7 @@ static int map_switch_event(struct perf_sched *sched, struct perf_evsel *evsel,
 	printf("  %12.6f secs ", (double)timestamp/1e9);
 	if (new_shortname) {
 		printf("%s => %s:%d\n",
-			sched_in->shortname, sched_in->comm, sched_in->pid);
+			sched_in->shortname, sched_in->comm, sched_in->tid);
 	} else {
 		printf("\n");
 	}
diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index ab3ed4a..6a36a95 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -142,7 +142,7 @@ static size_t trace__fprintf_entry_head(struct trace *trace, struct thread *thre
 	printed += fprintf_duration(duration, fp);
 
 	if (trace->multiple_threads)
-		printed += fprintf(fp, "%d ", thread->pid);
+		printed += fprintf(fp, "%d ", thread->tid);
 
 	return printed;
 }
@@ -593,7 +593,7 @@ static size_t trace__fprintf_thread_summary(struct trace *trace, FILE *fp)
 			color = PERF_COLOR_YELLOW;
 
 		printed += color_fprintf(fp, color, "%20s", thread->comm);
-		printed += fprintf(fp, " - %-5d :%11lu   [", thread->pid, ttrace->nr_events);
+		printed += fprintf(fp, " - %-5d :%11lu   [", thread->tid, ttrace->nr_events);
 		printed += color_fprintf(fp, color, "%5.1f%%", ratio);
 		printed += fprintf(fp, " ] %10.3f ms\n", ttrace->runtime_ms);
 	}
diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c
index fc0bd38..06e892f 100644
--- a/tools/perf/ui/browsers/hists.c
+++ b/tools/perf/ui/browsers/hists.c
@@ -1256,7 +1256,7 @@ static int hists__browser_title(struct hists *hists, char *bf, size_t size,
 		printed += scnprintf(bf + printed, size - printed,
 				    ", Thread: %s(%d)",
 				    (thread->comm_set ? thread->comm : ""),
-				    thread->pid);
+				    thread->tid);
 	if (dso)
 		printed += scnprintf(bf + printed, size - printed,
 				    ", DSO: %s", dso->short_name);
@@ -1579,7 +1579,7 @@ static int perf_evsel__hists_browse(struct perf_evsel *evsel, int nr_events,
 		    asprintf(&options[nr_options], "Zoom %s %s(%d) thread",
 			     (browser->hists->thread_filter ? "out of" : "into"),
 			     (thread->comm_set ? thread->comm : ""),
-			     thread->pid) > 0)
+			     thread->tid) > 0)
 			zoom_thread = nr_options++;
 
 		if (dso != NULL &&
@@ -1702,7 +1702,7 @@ zoom_out_thread:
 			} else {
 				ui_helpline__fpush("To zoom out press <- or -> + \"Zoom out of %s(%d) thread\"",
 						   thread->comm_set ? thread->comm : "",
-						   thread->pid);
+						   thread->tid);
 				browser->hists->thread_filter = thread;
 				sort_thread.elide = true;
 				pstack__push(fstack, &browser->hists->thread_filter);
diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
index 5cd13d7..9541270 100644
--- a/tools/perf/util/event.c
+++ b/tools/perf/util/event.c
@@ -686,7 +686,7 @@ int perf_event__preprocess_sample(const union perf_event *event,
 	    !strlist__has_entry(symbol_conf.comm_list, thread->comm))
 		goto out_filtered;
 
-	dump_printf(" ... thread: %s:%d\n", thread->comm, thread->pid);
+	dump_printf(" ... thread: %s:%d\n", thread->comm, thread->tid);
 	/*
 	 * Have we already created the kernel maps for this machine?
 	 *
diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index b2ecad6..ef0be97 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -233,7 +233,7 @@ void machines__set_id_hdr_size(struct machines *machines, u16 id_hdr_size)
 	return;
 }
 
-static struct thread *__machine__findnew_thread(struct machine *machine, pid_t pid,
+static struct thread *__machine__findnew_thread(struct machine *machine, pid_t tid,
 						bool create)
 {
 	struct rb_node **p = &machine->threads.rb_node;
@@ -241,23 +241,23 @@ static struct thread *__machine__findnew_thread(struct machine *machine, pid_t p
 	struct thread *th;
 
 	/*
-	 * Font-end cache - PID lookups come in blocks,
+	 * Front-end cache - TID lookups come in blocks,
 	 * so most of the time we dont have to look up
 	 * the full rbtree:
 	 */
-	if (machine->last_match && machine->last_match->pid == pid)
+	if (machine->last_match && machine->last_match->tid == tid)
 		return machine->last_match;
 
 	while (*p != NULL) {
 		parent = *p;
 		th = rb_entry(parent, struct thread, rb_node);
 
-		if (th->pid == pid) {
+		if (th->tid == tid) {
 			machine->last_match = th;
 			return th;
 		}
 
-		if (pid < th->pid)
+		if (tid < th->tid)
 			p = &(*p)->rb_left;
 		else
 			p = &(*p)->rb_right;
@@ -266,7 +266,7 @@ static struct thread *__machine__findnew_thread(struct machine *machine, pid_t p
 	if (!create)
 		return NULL;
 
-	th = thread__new(pid);
+	th = thread__new(tid);
 	if (th != NULL) {
 		rb_link_node(&th->rb_node, parent, p);
 		rb_insert_color(&th->rb_node, &machine->threads);
@@ -276,14 +276,14 @@ static struct thread *__machine__findnew_thread(struct machine *machine, pid_t p
 	return th;
 }
 
-struct thread *machine__findnew_thread(struct machine *machine, pid_t pid)
+struct thread *machine__findnew_thread(struct machine *machine, pid_t tid)
 {
-	return __machine__findnew_thread(machine, pid, true);
+	return __machine__findnew_thread(machine, tid, true);
 }
 
-struct thread *machine__find_thread(struct machine *machine, pid_t pid)
+struct thread *machine__find_thread(struct machine *machine, pid_t tid)
 {
-	return __machine__findnew_thread(machine, pid, false);
+	return __machine__findnew_thread(machine, tid, false);
 }
 
 int machine__process_comm_event(struct machine *machine, union perf_event *event)
diff --git a/tools/perf/util/machine.h b/tools/perf/util/machine.h
index 7794068..e49ba01 100644
--- a/tools/perf/util/machine.h
+++ b/tools/perf/util/machine.h
@@ -36,7 +36,7 @@ struct map *machine__kernel_map(struct machine *machine, enum map_type type)
 	return machine->vmlinux_maps[type];
 }
 
-struct thread *machine__find_thread(struct machine *machine, pid_t pid);
+struct thread *machine__find_thread(struct machine *machine, pid_t tid);
 
 int machine__process_comm_event(struct machine *machine, union perf_event *event);
 int machine__process_exit_event(struct machine *machine, union perf_event *event);
@@ -99,7 +99,7 @@ static inline bool machine__is_host(struct machine *machine)
 	return machine ? machine->pid == HOST_KERNEL_ID : false;
 }
 
-struct thread *machine__findnew_thread(struct machine *machine, pid_t pid);
+struct thread *machine__findnew_thread(struct machine *machine, pid_t tid);
 
 size_t machine__fprintf(struct machine *machine, FILE *fp);
 
diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
index 313a5a7..8deee19 100644
--- a/tools/perf/util/sort.c
+++ b/tools/perf/util/sort.c
@@ -55,14 +55,14 @@ static int64_t cmp_null(void *l, void *r)
 static int64_t
 sort__thread_cmp(struct hist_entry *left, struct hist_entry *right)
 {
-	return right->thread->pid - left->thread->pid;
+	return right->thread->tid - left->thread->tid;
 }
 
 static int hist_entry__thread_snprintf(struct hist_entry *self, char *bf,
 				       size_t size, unsigned int width)
 {
 	return repsep_snprintf(bf, size, "%*s:%5d", width - 6,
-			      self->thread->comm ?: "", self->thread->pid);
+			      self->thread->comm ?: "", self->thread->tid);
 }
 
 struct sort_entry sort_thread = {
@@ -77,7 +77,7 @@ struct sort_entry sort_thread = {
 static int64_t
 sort__comm_cmp(struct hist_entry *left, struct hist_entry *right)
 {
-	return right->thread->pid - left->thread->pid;
+	return right->thread->tid - left->thread->tid;
 }
 
 static int64_t
diff --git a/tools/perf/util/thread.c b/tools/perf/util/thread.c
index 40399cb..6feeb88 100644
--- a/tools/perf/util/thread.c
+++ b/tools/perf/util/thread.c
@@ -7,17 +7,17 @@
 #include "util.h"
 #include "debug.h"
 
-struct thread *thread__new(pid_t pid)
+struct thread *thread__new(pid_t tid)
 {
 	struct thread *self = zalloc(sizeof(*self));
 
 	if (self != NULL) {
 		map_groups__init(&self->mg);
-		self->pid = pid;
+		self->tid = tid;
 		self->ppid = -1;
 		self->comm = malloc(32);
 		if (self->comm)
-			snprintf(self->comm, 32, ":%d", self->pid);
+			snprintf(self->comm, 32, ":%d", self->tid);
 	}
 
 	return self;
@@ -57,7 +57,7 @@ int thread__comm_len(struct thread *self)
 
 size_t thread__fprintf(struct thread *thread, FILE *fp)
 {
-	return fprintf(fp, "Thread %d %s\n", thread->pid, thread->comm) +
+	return fprintf(fp, "Thread %d %s\n", thread->tid, thread->comm) +
 	       map_groups__fprintf(&thread->mg, verbose, fp);
 }
 
@@ -84,7 +84,7 @@ int thread__fork(struct thread *self, struct thread *parent)
 		if (map_groups__clone(&self->mg, &parent->mg, i) < 0)
 			return -ENOMEM;
 
-	self->ppid = parent->pid;
+	self->ppid = parent->tid;
 
 	return 0;
 }
diff --git a/tools/perf/util/thread.h b/tools/perf/util/thread.h
index eeb7ac6..37a86a3 100644
--- a/tools/perf/util/thread.h
+++ b/tools/perf/util/thread.h
@@ -12,7 +12,7 @@ struct thread {
 		struct list_head node;
 	};
 	struct map_groups	mg;
-	pid_t			pid;
+	pid_t			tid;
 	pid_t			ppid;
 	char			shortname[3];
 	bool			comm_set;
@@ -24,7 +24,7 @@ struct thread {
 
 struct machine;
 
-struct thread *thread__new(pid_t pid);
+struct thread *thread__new(pid_t tid);
 void thread__delete(struct thread *self);
 
 int thread__set_comm(struct thread *self, const char *comm);
-- 
1.7.11.7

[PATCH 14/15] perf tools: add pid to struct thread

[Adrian Hunter]

Record pid on struct thread.  The member is named 'pid_'
to avoid confusion with the 'tid' member which was previously
named 'pid'.

Note that while "machine" functions update 'pid_', most tools
do not.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
 tools/perf/util/machine.c | 47 ++++++++++++++++++++++++++++++++++++++---------
 tools/perf/util/machine.h |  4 ++++
 tools/perf/util/thread.c  |  3 ++-
 tools/perf/util/thread.h  |  3 ++-
 4 files changed, 46 insertions(+), 11 deletions(-)

diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index ef0be97..d11ca3b 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -233,7 +233,8 @@ void machines__set_id_hdr_size(struct machines *machines, u16 id_hdr_size)
 	return;
 }
 
-static struct thread *__machine__findnew_thread(struct machine *machine, pid_t tid,
+static struct thread *__machine__findnew_thread(struct machine *machine,
+						pid_t pid, pid_t tid,
 						bool create)
 {
 	struct rb_node **p = &machine->threads.rb_node;
@@ -245,8 +246,11 @@ static struct thread *__machine__findnew_thread(struct machine *machine, pid_t t
 	 * so most of the time we dont have to look up
 	 * the full rbtree:
 	 */
-	if (machine->last_match && machine->last_match->tid == tid)
+	if (machine->last_match && machine->last_match->tid == tid) {
+		if (pid && !machine->last_match->pid_)
+			machine->last_match->pid_ = pid;
 		return machine->last_match;
+	}
 
 	while (*p != NULL) {
 		parent = *p;
@@ -254,6 +258,8 @@ static struct thread *__machine__findnew_thread(struct machine *machine, pid_t t
 
 		if (th->tid == tid) {
 			machine->last_match = th;
+			if (pid && !th->pid_)
+				th->pid_ = pid;
 			return th;
 		}
 
@@ -266,7 +272,7 @@ static struct thread *__machine__findnew_thread(struct machine *machine, pid_t t
 	if (!create)
 		return NULL;
 
-	th = thread__new(tid);
+	th = thread__new(pid, tid);
 	if (th != NULL) {
 		rb_link_node(&th->rb_node, parent, p);
 		rb_insert_color(&th->rb_node, &machine->threads);
@@ -278,17 +284,25 @@ static struct thread *__machine__findnew_thread(struct machine *machine, pid_t t
 
 struct thread *machine__findnew_thread(struct machine *machine, pid_t tid)
 {
-	return __machine__findnew_thread(machine, tid, true);
+	return __machine__findnew_thread(machine, 0, tid, true);
+}
+
+struct thread *machine__findnew_thread_ex(struct machine *machine, pid_t pid,
+					  pid_t tid)
+{
+	return __machine__findnew_thread(machine, pid, tid, true);
 }
 
 struct thread *machine__find_thread(struct machine *machine, pid_t tid)
 {
-	return __machine__findnew_thread(machine, tid, false);
+	return __machine__findnew_thread(machine, 0, tid, false);
 }
 
 int machine__process_comm_event(struct machine *machine, union perf_event *event)
 {
-	struct thread *thread = machine__findnew_thread(machine, event->comm.tid);
+	struct thread *thread = machine__findnew_thread_ex(machine,
+							   event->comm.pid,
+							   event->comm.tid);
 
 	if (dump_trace)
 		perf_event__fprintf_comm(event, stdout);
@@ -969,7 +983,8 @@ int machine__process_mmap_event(struct machine *machine, union perf_event *event
 		return 0;
 	}
 
-	thread = machine__findnew_thread(machine, event->mmap.pid);
+	thread = machine__findnew_thread_ex(machine, event->mmap.pid,
+					    event->mmap.pid);
 	if (thread == NULL)
 		goto out_problem;
 
@@ -996,8 +1011,12 @@ out_problem:
 
 int machine__process_fork_event(struct machine *machine, union perf_event *event)
 {
-	struct thread *thread = machine__findnew_thread(machine, event->fork.tid);
-	struct thread *parent = machine__findnew_thread(machine, event->fork.ptid);
+	struct thread *thread = machine__findnew_thread_ex(machine,
+							   event->fork.pid,
+							   event->fork.tid);
+	struct thread *parent = machine__findnew_thread_ex(machine,
+							   event->fork.ppid,
+							   event->fork.ptid);
 
 	if (dump_trace)
 		perf_event__fprintf_task(event, stdout);
@@ -1264,3 +1283,13 @@ int machine__resolve_callchain(struct machine *machine,
 				   sample);
 
 }
+
+pid_t machine__get_thread_pid(struct machine *machine, pid_t tid)
+{
+	struct thread *thread = machine__find_thread(machine, tid);
+
+	if (!thread)
+		return 0;
+
+	return thread->pid_;
+}
diff --git a/tools/perf/util/machine.h b/tools/perf/util/machine.h
index e49ba01..11a53d5 100644
--- a/tools/perf/util/machine.h
+++ b/tools/perf/util/machine.h
@@ -100,6 +100,8 @@ static inline bool machine__is_host(struct machine *machine)
 }
 
 struct thread *machine__findnew_thread(struct machine *machine, pid_t tid);
+struct thread *machine__findnew_thread_ex(struct machine *machine, pid_t pid,
+					  pid_t tid);
 
 size_t machine__fprintf(struct machine *machine, FILE *fp);
 
@@ -156,4 +158,6 @@ void machines__destroy_kernel_maps(struct machines *machines);
 
 size_t machine__fprintf_vmlinux_path(struct machine *machine, FILE *fp);
 
+pid_t machine__get_thread_pid(struct machine *machine, pid_t tid);
+
 #endif /* __PERF_MACHINE_H */
diff --git a/tools/perf/util/thread.c b/tools/perf/util/thread.c
index 6feeb88..e3d4a55 100644
--- a/tools/perf/util/thread.c
+++ b/tools/perf/util/thread.c
@@ -7,12 +7,13 @@
 #include "util.h"
 #include "debug.h"
 
-struct thread *thread__new(pid_t tid)
+struct thread *thread__new(pid_t pid, pid_t tid)
 {
 	struct thread *self = zalloc(sizeof(*self));
 
 	if (self != NULL) {
 		map_groups__init(&self->mg);
+		self->pid_ = pid;
 		self->tid = tid;
 		self->ppid = -1;
 		self->comm = malloc(32);
diff --git a/tools/perf/util/thread.h b/tools/perf/util/thread.h
index 37a86a3..bfa68e7 100644
--- a/tools/perf/util/thread.h
+++ b/tools/perf/util/thread.h
@@ -12,6 +12,7 @@ struct thread {
 		struct list_head node;
 	};
 	struct map_groups	mg;
+	pid_t			pid_; /* Not all tools update this */
 	pid_t			tid;
 	pid_t			ppid;
 	char			shortname[3];
@@ -24,7 +25,7 @@ struct thread {
 
 struct machine;
 
-struct thread *thread__new(pid_t tid);
+struct thread *thread__new(pid_t pid, pid_t tid);
 void thread__delete(struct thread *self);
 
 int thread__set_comm(struct thread *self, const char *comm);
-- 
1.7.11.7

[PATCH 15/15] perf tools: fix ppid in thread__fork()

[Adrian Hunter]

ppid should be assigned to the parents pid.  Note
'thread__fork()'s only caller 'machine__process_fork_event()'
ensures that the parents pid is set.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
 tools/perf/util/thread.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/thread.c b/tools/perf/util/thread.c
index e3d4a55..93f3eab 100644
--- a/tools/perf/util/thread.c
+++ b/tools/perf/util/thread.c
@@ -85,7 +85,7 @@ int thread__fork(struct thread *self, struct thread *parent)
 		if (map_groups__clone(&self->mg, &parent->mg, i) < 0)
 			return -ENOMEM;
 
-	self->ppid = parent->tid;
+	self->ppid = parent->pid_;
 
 	return 0;
 }
-- 
1.7.11.7

Re: [PATCH 12/15] perf tools: allow non-matching sample types

[Stephane Eranian]

On Mon, Jun 24, 2013 at 3:16 PM, Adrian Hunter <adrian.hunter@intel.com> wrote:
> Sample types need not be identical to determine
> the sample id from the event.  Only the position
> of the sample id needs to be the same.
>
> Compatible sample types are ones in which the bits
> defined by PERF_COMPAT_MASK are the same.
> 'perf_evlist__config()' forces sample types to be
> compatible on that basis.
>
This is indeed a major flaw of the current sampling buffer format.
I have a patch coming to address this from the kernel side.

I am trying to understand this patch and I am confused by the
description and especially the structure of COMPAT_MASK.

I agree that if the SAMPLE_ID position remains constant then
it can be extracted from the body of the sample uniformly.
The only way to guarantee a fixed position is by ensuring that
all the sample_types before SAMPLE_ID and either set or
unset. By before I don't mean in the enum order but in the
order in which the kernel lays them various sample_types
in the buffer. And that's determined by perf_output_sample().
So I don't understand why PERF_SAMPLE_CPU and
PERF_SAMPLE_STREAM_ID  are here.

Any explanation?


> Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
> ---
>  tools/perf/util/event.h  |  6 ++++
>  tools/perf/util/evlist.c | 93 ++++++++++++++++++++++++++++++++++++++++++++++--
>  tools/perf/util/evlist.h |  3 ++
>  tools/perf/util/evsel.c  | 41 +++++++++++++++++++++
>  tools/perf/util/evsel.h  |  4 +++
>  5 files changed, 145 insertions(+), 2 deletions(-)
>
> diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
> index 1813895..858572f 100644
> --- a/tools/perf/util/event.h
> +++ b/tools/perf/util/event.h
> @@ -65,6 +65,12 @@ struct read_event {
>         PERF_SAMPLE_ID | PERF_SAMPLE_STREAM_ID |        \
>          PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD)
>
> +#define PERF_COMPAT_MASK                               \
> +       (PERF_SAMPLE_IP   | PERF_SAMPLE_TID       |     \
> +        PERF_SAMPLE_TIME | PERF_SAMPLE_ADDR      |     \
> +        PERF_SAMPLE_ID   | PERF_SAMPLE_STREAM_ID |     \
> +        PERF_SAMPLE_CPU)
> +
>  struct sample_event {
>         struct perf_event_header        header;
>         u64 array[];
> diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
> index a660f56..85c4d91 100644
> --- a/tools/perf/util/evlist.c
> +++ b/tools/perf/util/evlist.c
> @@ -49,10 +49,20 @@ struct perf_evlist *perf_evlist__new(void)
>         return evlist;
>  }
>
> +static void perf_evlist__set_id_pos(struct perf_evlist *evlist)
> +{
> +       struct perf_evsel *first = perf_evlist__first(evlist);
> +
> +       evlist->id_pos = first->id_pos;
> +       evlist->is_pos = first->is_pos;
> +}
> +
>  void perf_evlist__config(struct perf_evlist *evlist,
>                         struct perf_record_opts *opts)
>  {
>         struct perf_evsel *evsel;
> +       u64 compat = 0;
> +
>         /*
>          * Set the evsel leader links before we configure attributes,
>          * since some might depend on this info.
> @@ -68,7 +78,15 @@ void perf_evlist__config(struct perf_evlist *evlist,
>
>                 if (evlist->nr_entries > 1)
>                         perf_evsel__set_sample_id(evsel);
> +               compat |= evsel->attr.sample_type & PERF_COMPAT_MASK;
>         }
> +
> +       list_for_each_entry(evsel, &evlist->entries, node) {
> +               evsel->attr.sample_type |= compat;
> +               perf_evsel__calc_id_pos(evsel);
> +       }
> +
> +       perf_evlist__set_id_pos(evlist);
>  }
>
>  static void perf_evlist__purge(struct perf_evlist *evlist)
> @@ -102,6 +120,7 @@ void perf_evlist__add(struct perf_evlist *evlist, struct perf_evsel *entry)
>  {
>         list_add_tail(&entry->node, &evlist->entries);
>         ++evlist->nr_entries;
> +       perf_evlist__set_id_pos(evlist);
>  }
>
>  void perf_evlist__splice_list_tail(struct perf_evlist *evlist,
> @@ -110,6 +129,7 @@ void perf_evlist__splice_list_tail(struct perf_evlist *evlist,
>  {
>         list_splice_tail(list, &evlist->entries);
>         evlist->nr_entries += nr_entries;
> +       perf_evlist__set_id_pos(evlist);
>  }
>
>  void __perf_evlist__set_leader(struct list_head *list)
> @@ -339,6 +359,55 @@ struct perf_evsel *perf_evlist__id2evsel(struct perf_evlist *evlist, u64 id)
>         return NULL;
>  }
>
> +static int perf_evlist__event2id(struct perf_evlist *evlist,
> +                                union perf_event *event, u64 *id)
> +{
> +       const u64 *array = event->sample.array;
> +       ssize_t n;
> +
> +       n = (event->header.size - sizeof(event->header)) >> 3;
> +
> +       if (event->header.type == PERF_RECORD_SAMPLE) {
> +               if (evlist->id_pos >= n)
> +                       return -1;
> +               *id = array[evlist->id_pos];
> +       } else {
> +               if (evlist->is_pos >= n)
> +                       return -1;
> +               n -= evlist->is_pos;
> +               *id = array[n];
> +       }
> +       return 0;
> +}
> +
> +static struct perf_evsel *perf_evlist__event2evsel(struct perf_evlist *evlist,
> +                                                  union perf_event *event)
> +{
> +       struct hlist_head *head;
> +       struct perf_sample_id *sid;
> +       int hash;
> +       u64 id;
> +
> +       if (evlist->nr_entries == 1 || evlist->matching_sample_types)
> +               return perf_evlist__first(evlist);
> +
> +       if (perf_evlist__event2id(evlist, event, &id))
> +               return NULL;
> +
> +       /* Synthesized events have an id of zero */
> +       if (!id)
> +               return perf_evlist__first(evlist);
> +
> +       hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
> +       head = &evlist->heads[hash];
> +
> +       hlist_for_each_entry(sid, head, node) {
> +               if (sid->id == id)
> +                       return sid->evsel;
> +       }
> +       return NULL;
> +}
> +
>  union perf_event *perf_evlist__mmap_read(struct perf_evlist *evlist, int idx)
>  {
>         struct perf_mmap *md = &evlist->mmap[idx];
> @@ -650,9 +719,26 @@ int perf_evlist__set_filter(struct perf_evlist *evlist, const char *filter)
>  bool perf_evlist__valid_sample_type(struct perf_evlist *evlist)
>  {
>         struct perf_evsel *first = perf_evlist__first(evlist), *pos = first;
> +       bool ok = true;
>
>         list_for_each_entry_continue(pos, &evlist->entries, node) {
> -               if (first->attr.sample_type != pos->attr.sample_type)
> +               if (first->attr.sample_type != pos->attr.sample_type) {
> +                       ok = false;
> +                       break;
> +               }
> +       }
> +
> +       if (ok) {
> +               evlist->matching_sample_types = true;
> +               return true;
> +       }
> +
> +       if (evlist->id_pos < 0 || evlist->is_pos < 0)
> +               return false;
> +
> +       list_for_each_entry(pos, &evlist->entries, node) {
> +               if (pos->id_pos != evlist->id_pos ||
> +                   pos->is_pos != evlist->is_pos)
>                         return false;
>         }
>
> @@ -848,7 +934,10 @@ int perf_evlist__start_workload(struct perf_evlist *evlist)
>  int perf_evlist__parse_sample(struct perf_evlist *evlist, union perf_event *event,
>                               struct perf_sample *sample)
>  {
> -       struct perf_evsel *evsel = perf_evlist__first(evlist);
> +       struct perf_evsel *evsel = perf_evlist__event2evsel(evlist, event);
> +
> +       if (!evsel)
> +               return -EFAULT;
>         return perf_evsel__parse_sample(evsel, event, sample);
>  }
>
> diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h
> index 0583d36..bfcbf67 100644
> --- a/tools/perf/util/evlist.h
> +++ b/tools/perf/util/evlist.h
> @@ -32,11 +32,14 @@ struct perf_evlist {
>         int              nr_fds;
>         int              nr_mmaps;
>         int              mmap_len;
> +       int              id_pos;
> +       int              is_pos;
>         struct {
>                 int     cork_fd;
>                 pid_t   pid;
>         } workload;
>         bool             overwrite;
> +       bool             matching_sample_types;
>         struct perf_mmap *mmap;
>         struct pollfd    *pollfd;
>         struct thread_map *threads;
> diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
> index d01d2cd..ee0f894 100644
> --- a/tools/perf/util/evsel.c
> +++ b/tools/perf/util/evsel.c
> @@ -46,6 +46,46 @@ static int __perf_evsel__sample_size(u64 sample_type)
>         return size;
>  }
>
> +static int __perf_evsel__calc_id_pos(u64 sample_type)
> +{
> +       u64 mask;
> +       int i, idx;
> +
> +       if (!(sample_type & PERF_SAMPLE_ID))
> +               return -1;
> +
> +       mask = sample_type & (PERF_SAMPLE_ID - 1);
> +
> +       for (i = 0, idx = 0; i < 64; i++) {
> +               if (mask & (1ULL << i))
> +                       idx++;
> +       }
> +
> +       return idx;
> +}
> +
> +static int __perf_evsel__calc_is_pos(u64 sample_type)
> +{
> +       int idx = 1;
> +
> +       if (!(sample_type & PERF_SAMPLE_ID))
> +               return -1;
> +
> +       if (sample_type & PERF_SAMPLE_CPU)
> +               idx += 1;
> +
> +       if (sample_type & PERF_SAMPLE_STREAM_ID)
> +               idx += 1;
> +
> +       return idx;
> +}
> +
> +void perf_evsel__calc_id_pos(struct perf_evsel *evsel)
> +{
> +       evsel->id_pos = __perf_evsel__calc_id_pos(evsel->attr.sample_type);
> +       evsel->is_pos = __perf_evsel__calc_is_pos(evsel->attr.sample_type);
> +}
> +
>  void hists__init(struct hists *hists)
>  {
>         memset(hists, 0, sizeof(*hists));
> @@ -89,6 +129,7 @@ void perf_evsel__init(struct perf_evsel *evsel,
>         INIT_LIST_HEAD(&evsel->node);
>         hists__init(&evsel->hists);
>         evsel->sample_size = __perf_evsel__sample_size(attr->sample_type);
> +       perf_evsel__calc_id_pos(evsel);
>  }
>
>  struct perf_evsel *perf_evsel__new(struct perf_event_attr *attr, int idx)
> diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
> index 3f156cc..88b4319 100644
> --- a/tools/perf/util/evsel.h
> +++ b/tools/perf/util/evsel.h
> @@ -71,6 +71,8 @@ struct perf_evsel {
>         } handler;
>         struct cpu_map          *cpus;
>         unsigned int            sample_size;
> +       int                     id_pos;
> +       int                     is_pos;
>         bool                    supported;
>         bool                    needs_swap;
>         /* parse modifier helper */
> @@ -100,6 +102,8 @@ void perf_evsel__delete(struct perf_evsel *evsel);
>  void perf_evsel__config(struct perf_evsel *evsel,
>                         struct perf_record_opts *opts);
>
> +void perf_evsel__calc_id_pos(struct perf_evsel *evsel);
> +
>  bool perf_evsel__is_cache_op_valid(u8 type, u8 op);
>
>  #define PERF_EVSEL__MAX_ALIASES 8
> --
> 1.7.11.7
>

Re: [PATCH 12/15] perf tools: allow non-matching sample types

[Adrian Hunter]

On 25/06/13 14:23, Stephane Eranian wrote:
> On Mon, Jun 24, 2013 at 3:16 PM, Adrian Hunter <adrian.hunter@intel.com> wrote:
>> Sample types need not be identical to determine
>> the sample id from the event.  Only the position
>> of the sample id needs to be the same.
>>
>> Compatible sample types are ones in which the bits
>> defined by PERF_COMPAT_MASK are the same.
>> 'perf_evlist__config()' forces sample types to be
>> compatible on that basis.
>>
> This is indeed a major flaw of the current sampling buffer format.
> I have a patch coming to address this from the kernel side.
> 
> I am trying to understand this patch and I am confused by the
> description and especially the structure of COMPAT_MASK.
> 
> I agree that if the SAMPLE_ID position remains constant then
> it can be extracted from the body of the sample uniformly.
> The only way to guarantee a fixed position is by ensuring that
> all the sample_types before SAMPLE_ID and either set or
> unset. By before I don't mean in the enum order but in the
> order in which the kernel lays them various sample_types
> in the buffer. And that's determined by perf_output_sample().
> So I don't understand why PERF_SAMPLE_CPU and
> PERF_SAMPLE_STREAM_ID  are here.
> 
> Any explanation?

There are 2 sample formats: one for sample events and one for other events
(the id sample).  In perf tools refer __perf_evsel__parse_sample() vs
perf_evsel__parse_id_sample().


> 
> 
>> Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
>> ---
>>  tools/perf/util/event.h  |  6 ++++
>>  tools/perf/util/evlist.c | 93 ++++++++++++++++++++++++++++++++++++++++++++++--
>>  tools/perf/util/evlist.h |  3 ++
>>  tools/perf/util/evsel.c  | 41 +++++++++++++++++++++
>>  tools/perf/util/evsel.h  |  4 +++
>>  5 files changed, 145 insertions(+), 2 deletions(-)
>>
>> diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
>> index 1813895..858572f 100644
>> --- a/tools/perf/util/event.h
>> +++ b/tools/perf/util/event.h
>> @@ -65,6 +65,12 @@ struct read_event {
>>         PERF_SAMPLE_ID | PERF_SAMPLE_STREAM_ID |        \
>>          PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD)
>>
>> +#define PERF_COMPAT_MASK                               \
>> +       (PERF_SAMPLE_IP   | PERF_SAMPLE_TID       |     \
>> +        PERF_SAMPLE_TIME | PERF_SAMPLE_ADDR      |     \
>> +        PERF_SAMPLE_ID   | PERF_SAMPLE_STREAM_ID |     \
>> +        PERF_SAMPLE_CPU)
>> +
>>  struct sample_event {
>>         struct perf_event_header        header;
>>         u64 array[];
>> diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
>> index a660f56..85c4d91 100644
>> --- a/tools/perf/util/evlist.c
>> +++ b/tools/perf/util/evlist.c
>> @@ -49,10 +49,20 @@ struct perf_evlist *perf_evlist__new(void)
>>         return evlist;
>>  }
>>
>> +static void perf_evlist__set_id_pos(struct perf_evlist *evlist)
>> +{
>> +       struct perf_evsel *first = perf_evlist__first(evlist);
>> +
>> +       evlist->id_pos = first->id_pos;
>> +       evlist->is_pos = first->is_pos;
>> +}
>> +
>>  void perf_evlist__config(struct perf_evlist *evlist,
>>                         struct perf_record_opts *opts)
>>  {
>>         struct perf_evsel *evsel;
>> +       u64 compat = 0;
>> +
>>         /*
>>          * Set the evsel leader links before we configure attributes,
>>          * since some might depend on this info.
>> @@ -68,7 +78,15 @@ void perf_evlist__config(struct perf_evlist *evlist,
>>
>>                 if (evlist->nr_entries > 1)
>>                         perf_evsel__set_sample_id(evsel);
>> +               compat |= evsel->attr.sample_type & PERF_COMPAT_MASK;
>>         }
>> +
>> +       list_for_each_entry(evsel, &evlist->entries, node) {
>> +               evsel->attr.sample_type |= compat;
>> +               perf_evsel__calc_id_pos(evsel);
>> +       }
>> +
>> +       perf_evlist__set_id_pos(evlist);
>>  }
>>
>>  static void perf_evlist__purge(struct perf_evlist *evlist)
>> @@ -102,6 +120,7 @@ void perf_evlist__add(struct perf_evlist *evlist, struct perf_evsel *entry)
>>  {
>>         list_add_tail(&entry->node, &evlist->entries);
>>         ++evlist->nr_entries;
>> +       perf_evlist__set_id_pos(evlist);
>>  }
>>
>>  void perf_evlist__splice_list_tail(struct perf_evlist *evlist,
>> @@ -110,6 +129,7 @@ void perf_evlist__splice_list_tail(struct perf_evlist *evlist,
>>  {
>>         list_splice_tail(list, &evlist->entries);
>>         evlist->nr_entries += nr_entries;
>> +       perf_evlist__set_id_pos(evlist);
>>  }
>>
>>  void __perf_evlist__set_leader(struct list_head *list)
>> @@ -339,6 +359,55 @@ struct perf_evsel *perf_evlist__id2evsel(struct perf_evlist *evlist, u64 id)
>>         return NULL;
>>  }
>>
>> +static int perf_evlist__event2id(struct perf_evlist *evlist,
>> +                                union perf_event *event, u64 *id)
>> +{
>> +       const u64 *array = event->sample.array;
>> +       ssize_t n;
>> +
>> +       n = (event->header.size - sizeof(event->header)) >> 3;
>> +
>> +       if (event->header.type == PERF_RECORD_SAMPLE) {
>> +               if (evlist->id_pos >= n)
>> +                       return -1;
>> +               *id = array[evlist->id_pos];
>> +       } else {
>> +               if (evlist->is_pos >= n)
>> +                       return -1;
>> +               n -= evlist->is_pos;
>> +               *id = array[n];
>> +       }
>> +       return 0;
>> +}
>> +
>> +static struct perf_evsel *perf_evlist__event2evsel(struct perf_evlist *evlist,
>> +                                                  union perf_event *event)
>> +{
>> +       struct hlist_head *head;
>> +       struct perf_sample_id *sid;
>> +       int hash;
>> +       u64 id;
>> +
>> +       if (evlist->nr_entries == 1 || evlist->matching_sample_types)
>> +               return perf_evlist__first(evlist);
>> +
>> +       if (perf_evlist__event2id(evlist, event, &id))
>> +               return NULL;
>> +
>> +       /* Synthesized events have an id of zero */
>> +       if (!id)
>> +               return perf_evlist__first(evlist);
>> +
>> +       hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
>> +       head = &evlist->heads[hash];
>> +
>> +       hlist_for_each_entry(sid, head, node) {
>> +               if (sid->id == id)
>> +                       return sid->evsel;
>> +       }
>> +       return NULL;
>> +}
>> +
>>  union perf_event *perf_evlist__mmap_read(struct perf_evlist *evlist, int idx)
>>  {
>>         struct perf_mmap *md = &evlist->mmap[idx];
>> @@ -650,9 +719,26 @@ int perf_evlist__set_filter(struct perf_evlist *evlist, const char *filter)
>>  bool perf_evlist__valid_sample_type(struct perf_evlist *evlist)
>>  {
>>         struct perf_evsel *first = perf_evlist__first(evlist), *pos = first;
>> +       bool ok = true;
>>
>>         list_for_each_entry_continue(pos, &evlist->entries, node) {
>> -               if (first->attr.sample_type != pos->attr.sample_type)
>> +               if (first->attr.sample_type != pos->attr.sample_type) {
>> +                       ok = false;
>> +                       break;
>> +               }
>> +       }
>> +
>> +       if (ok) {
>> +               evlist->matching_sample_types = true;
>> +               return true;
>> +       }
>> +
>> +       if (evlist->id_pos < 0 || evlist->is_pos < 0)
>> +               return false;
>> +
>> +       list_for_each_entry(pos, &evlist->entries, node) {
>> +               if (pos->id_pos != evlist->id_pos ||
>> +                   pos->is_pos != evlist->is_pos)
>>                         return false;
>>         }
>>
>> @@ -848,7 +934,10 @@ int perf_evlist__start_workload(struct perf_evlist *evlist)
>>  int perf_evlist__parse_sample(struct perf_evlist *evlist, union perf_event *event,
>>                               struct perf_sample *sample)
>>  {
>> -       struct perf_evsel *evsel = perf_evlist__first(evlist);
>> +       struct perf_evsel *evsel = perf_evlist__event2evsel(evlist, event);
>> +
>> +       if (!evsel)
>> +               return -EFAULT;
>>         return perf_evsel__parse_sample(evsel, event, sample);
>>  }
>>
>> diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h
>> index 0583d36..bfcbf67 100644
>> --- a/tools/perf/util/evlist.h
>> +++ b/tools/perf/util/evlist.h
>> @@ -32,11 +32,14 @@ struct perf_evlist {
>>         int              nr_fds;
>>         int              nr_mmaps;
>>         int              mmap_len;
>> +       int              id_pos;
>> +       int              is_pos;
>>         struct {
>>                 int     cork_fd;
>>                 pid_t   pid;
>>         } workload;
>>         bool             overwrite;
>> +       bool             matching_sample_types;
>>         struct perf_mmap *mmap;
>>         struct pollfd    *pollfd;
>>         struct thread_map *threads;
>> diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
>> index d01d2cd..ee0f894 100644
>> --- a/tools/perf/util/evsel.c
>> +++ b/tools/perf/util/evsel.c
>> @@ -46,6 +46,46 @@ static int __perf_evsel__sample_size(u64 sample_type)
>>         return size;
>>  }
>>
>> +static int __perf_evsel__calc_id_pos(u64 sample_type)
>> +{
>> +       u64 mask;
>> +       int i, idx;
>> +
>> +       if (!(sample_type & PERF_SAMPLE_ID))
>> +               return -1;
>> +
>> +       mask = sample_type & (PERF_SAMPLE_ID - 1);
>> +
>> +       for (i = 0, idx = 0; i < 64; i++) {
>> +               if (mask & (1ULL << i))
>> +                       idx++;
>> +       }
>> +
>> +       return idx;
>> +}
>> +
>> +static int __perf_evsel__calc_is_pos(u64 sample_type)
>> +{
>> +       int idx = 1;
>> +
>> +       if (!(sample_type & PERF_SAMPLE_ID))
>> +               return -1;
>> +
>> +       if (sample_type & PERF_SAMPLE_CPU)
>> +               idx += 1;
>> +
>> +       if (sample_type & PERF_SAMPLE_STREAM_ID)
>> +               idx += 1;
>> +
>> +       return idx;
>> +}
>> +
>> +void perf_evsel__calc_id_pos(struct perf_evsel *evsel)
>> +{
>> +       evsel->id_pos = __perf_evsel__calc_id_pos(evsel->attr.sample_type);
>> +       evsel->is_pos = __perf_evsel__calc_is_pos(evsel->attr.sample_type);
>> +}
>> +
>>  void hists__init(struct hists *hists)
>>  {
>>         memset(hists, 0, sizeof(*hists));
>> @@ -89,6 +129,7 @@ void perf_evsel__init(struct perf_evsel *evsel,
>>         INIT_LIST_HEAD(&evsel->node);
>>         hists__init(&evsel->hists);
>>         evsel->sample_size = __perf_evsel__sample_size(attr->sample_type);
>> +       perf_evsel__calc_id_pos(evsel);
>>  }
>>
>>  struct perf_evsel *perf_evsel__new(struct perf_event_attr *attr, int idx)
>> diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
>> index 3f156cc..88b4319 100644
>> --- a/tools/perf/util/evsel.h
>> +++ b/tools/perf/util/evsel.h
>> @@ -71,6 +71,8 @@ struct perf_evsel {
>>         } handler;
>>         struct cpu_map          *cpus;
>>         unsigned int            sample_size;
>> +       int                     id_pos;
>> +       int                     is_pos;
>>         bool                    supported;
>>         bool                    needs_swap;
>>         /* parse modifier helper */
>> @@ -100,6 +102,8 @@ void perf_evsel__delete(struct perf_evsel *evsel);
>>  void perf_evsel__config(struct perf_evsel *evsel,
>>                         struct perf_record_opts *opts);
>>
>> +void perf_evsel__calc_id_pos(struct perf_evsel *evsel);
>> +
>>  bool perf_evsel__is_cache_op_valid(u8 type, u8 op);
>>
>>  #define PERF_EVSEL__MAX_ALIASES 8
>> --
>> 1.7.11.7
>>
> 
> 

Re: [PATCH 12/15] perf tools: allow non-matching sample types

[Jiri Olsa]

On Mon, Jun 24, 2013 at 04:16:09PM +0300, Adrian Hunter wrote:
> Sample types need not be identical to determine
> the sample id from the event.  Only the position
> of the sample id needs to be the same.
> 
> Compatible sample types are ones in which the bits
> defined by PERF_COMPAT_MASK are the same.
> 'perf_evlist__config()' forces sample types to be
> compatible on that basis.

hi,
one of the patches is breaking test 4:

[jolsa@krava perf]$ sudo ./perf test
 1: vmlinux symtab matches kallsyms                        : Ok
 2: detect open syscall event                              : Ok
 3: detect open syscall event on all cpus                  : Ok
 4: read samples using the mmap interface                  :Can't parse sample, err = -14
 FAILED!

haven't checked deeply, but my guess is this one ;-)

jirka

Re: [PATCH 02/15] perf tools: fix missing tool parameter

[Jiri Olsa]

On Mon, Jun 24, 2013 at 04:15:59PM +0300, Adrian Hunter wrote:
> perf inject expects to get a reference to 'struct perf_inject'
> from its 'tool' member.  For that to work, 'tool' needs to be
> a parameter of all tool callbacks.  Make it so.
> 
> Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
> ---
>  tools/perf/builtin-inject.c | 24 ++++++++++--------------
>  tools/perf/util/header.c    |  6 ++++--
>  tools/perf/util/header.h    |  6 ++++--
>  tools/perf/util/session.c   | 11 +++++++----
>  tools/perf/util/tool.h      |  9 ++++-----
>  5 files changed, 29 insertions(+), 27 deletions(-)
> 
> diff --git a/tools/perf/builtin-inject.c b/tools/perf/builtin-inject.c
> index f299ddf..fb341f1 100644
> --- a/tools/perf/builtin-inject.c
> +++ b/tools/perf/builtin-inject.c
> @@ -73,22 +73,17 @@ static int perf_event__repipe_event_type_synth(struct perf_tool *tool,
>  	return perf_event__repipe_synth(tool, event);
>  }
>  
> -static int perf_event__repipe_tracing_data_synth(union perf_event *event,
> -						 struct perf_session *session
> -						 __maybe_unused)
> -{
> -	return perf_event__repipe_synth(NULL, event);
> -}
> -
> -static int perf_event__repipe_attr(union perf_event *event,
> -				   struct perf_evlist **pevlist __maybe_unused)
> +static int perf_event__repipe_attr(struct perf_tool *tool,
> +				   union perf_event *event,
> +				   struct perf_evlist **pevlist)
>  {
>  	int ret;
> -	ret = perf_event__process_attr(event, pevlist);
> +
> +	ret = perf_event__process_attr(tool, event, pevlist);
>  	if (ret)
>  		return ret;
>  
> -	return perf_event__repipe_synth(NULL, event);
> +	return perf_event__repipe_synth(tool, event);
>  }
>  
>  static int perf_event__repipe(struct perf_tool *tool,
> @@ -147,13 +142,14 @@ static int perf_event__repipe_fork(struct perf_tool *tool,
>  	return err;
>  }
>  
> -static int perf_event__repipe_tracing_data(union perf_event *event,
> +static int perf_event__repipe_tracing_data(struct perf_tool *tool,
> +					   union perf_event *event,
>  					   struct perf_session *session)
>  {
>  	int err;
>  
>  	perf_event__repipe_synth(NULL, event);

wouldn't this one cause segfault?

jirka

Re: [PATCH 06/15] perf tools: fix parse_events_terms() freeing local variable on error path

[Jiri Olsa]

On Mon, Jun 24, 2013 at 04:16:03PM +0300, Adrian Hunter wrote:
> The list_head is on the stack, so just free the rest of the list.
> 
> Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
> ---
>  tools/perf/util/pmu.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
> index 4c6f9c4..def64d4 100644
> --- a/tools/perf/util/pmu.c
> +++ b/tools/perf/util/pmu.c
> @@ -194,7 +194,8 @@ static int pmu_alias_terms(struct perf_pmu_alias *alias,
>  	list_for_each_entry(term, &alias->terms, list) {
>  		ret = parse_events_term__clone(&clone, term);
>  		if (ret) {
> -			parse_events__free_terms(&list);
> +			list_for_each_entry_safe(term, clone, &list, list)
> +				free(term);

Could you please add __parse_events__free_terms doing this
and being called from parse_events__free_terms as you did
for __perf_evlist__munmap in the other patch.

thanks,
jirka

Re: [PATCH 09/15] perf tools: validate perf event header size

[Jiri Olsa]

On Mon, Jun 24, 2013 at 04:16:06PM +0300, Adrian Hunter wrote:
> 'size' includes the header so must be at least
> 'sizeof(struct perf_event_header)'.  Error out
> immediately if that is not the case.  Also
> don't byte-swap the header until it is actually
> "fetched" from the mmap region.
> 
> Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
> ---
>  tools/perf/util/session.c | 14 ++++++++------
>  1 file changed, 8 insertions(+), 6 deletions(-)
> 
> diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
> index 19ea888..7e0d605 100644
> --- a/tools/perf/util/session.c
> +++ b/tools/perf/util/session.c
> @@ -1094,8 +1094,10 @@ more:
>  		perf_event_header__bswap(&event->header);
>  
>  	size = event->header.size;
> -	if (size == 0)
> -		size = 8;
> +	if (size < sizeof(struct perf_event_header)) {
> +		pr_err("bad event header size\n");
> +		goto out_err;
> +	}
>  
>  	if (size > cur_size) {
>  		void *new = realloc(buf, size);
> @@ -1161,12 +1163,12 @@ fetch_mmaped_event(struct perf_session *session,
>  
>  	event = (union perf_event *)(buf + head);
>  
> -	if (session->header.needs_swap)
> -		perf_event_header__bswap(&event->header);
> -
>  	if (head + event->header.size > mmap_size)
>  		return NULL;

dont we need to swap first before using event->header.size?

jirka

Re: [PATCH 01/15] perf tools: remove unused parameter

[Jiri Olsa]

On Mon, Jun 24, 2013 at 04:15:58PM +0300, Adrian Hunter wrote:
> 'machine' is unused in 'perf_event__repipe_synth()' and some
> callers pass NULL anyway.  So remove it.
> 
> Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>

Acked-by: Jiri Olsa <jolsa@redhat.com>

Re: [PATCH 03/15] perf tools: fix missing 'finished_round'

[Jiri Olsa]

On Mon, Jun 24, 2013 at 04:16:00PM +0300, Adrian Hunter wrote:
> By default, perf inject should "repipe" all events
> including 'finished_round'.
> 
> Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>

Acked-by: Jiri Olsa <jolsa@redhat.com>

Re: [PATCH 04/15] perf tools: fix parse_events_terms() segfault on error path

[Jiri Olsa]

On Mon, Jun 24, 2013 at 04:16:01PM +0300, Adrian Hunter wrote:
> On the error path, 'data.terms' may not have been
> initialised.
> 
> Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>

Acked-by: Jiri Olsa <jolsa@redhat.com>

Re: [PATCH 05/15] perf tools: fix new_term() missing free on error path

[Jiri Olsa]

On Mon, Jun 24, 2013 at 04:16:02PM +0300, Adrian Hunter wrote:
> On the error path, newly allocated 'term' must be freed.
> 
> Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>

Acked-by: Jiri Olsa <jolsa@redhat.com>

Re: [PATCH 08/15] perf tools: tidy duplicated munmap code

[Jiri Olsa]

On Mon, Jun 24, 2013 at 04:16:05PM +0300, Adrian Hunter wrote:
> The same lines of code are used in three places.
> Make it a new function '__perf_evlist__munmap()'.
> 
> Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>

Acked-by: Jiri Olsa <jolsa@redhat.com>

Re: [PATCH 10/15] perf tools: add debug prints

[Jiri Olsa]

On Mon, Jun 24, 2013 at 04:16:07PM +0300, Adrian Hunter wrote:
> It is useful to see the arguments to perf_event_open
> and whether the perf events ring buffer was mmapped
> per-cpu or per-thread.  That information will now be
> displayed when verbose is 2 i.e option -vv
> 
> Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>

got some fuzz when applying, anyway

Acked-by: Jiri Olsa <jolsa@redhat.com>

Re: [PATCH 12/15] perf tools: allow non-matching sample types

[Jiri Olsa]

On Tue, Jun 25, 2013 at 03:13:29PM +0300, Adrian Hunter wrote:
> On 25/06/13 14:23, Stephane Eranian wrote:
> > On Mon, Jun 24, 2013 at 3:16 PM, Adrian Hunter <adrian.hunter@intel.com> wrote:
> >> Sample types need not be identical to determine
> >> the sample id from the event.  Only the position
> >> of the sample id needs to be the same.
> >>
> >> Compatible sample types are ones in which the bits
> >> defined by PERF_COMPAT_MASK are the same.
> >> 'perf_evlist__config()' forces sample types to be
> >> compatible on that basis.
> >>

nice idea

> > This is indeed a major flaw of the current sampling buffer format.
> > I have a patch coming to address this from the kernel side.
> > 
> > I am trying to understand this patch and I am confused by the
> > description and especially the structure of COMPAT_MASK.
> > 
> > I agree that if the SAMPLE_ID position remains constant then
> > it can be extracted from the body of the sample uniformly.
> > The only way to guarantee a fixed position is by ensuring that
> > all the sample_types before SAMPLE_ID and either set or
> > unset. By before I don't mean in the enum order but in the
> > order in which the kernel lays them various sample_types
> > in the buffer. And that's determined by perf_output_sample().
> > So I don't understand why PERF_SAMPLE_CPU and
> > PERF_SAMPLE_STREAM_ID  are here.
> > 
> > Any explanation?

+1 for more comments in changelog and code ;-)

> 
> There are 2 sample formats: one for sample events and one for other events
> (the id sample).  In perf tools refer __perf_evsel__parse_sample() vs
> perf_evsel__parse_id_sample().

For non sample events the ID info is stored backwards via:
__perf_event__output_id_sample kernel func.

Why do you use PERF_SAMPLE_STREAM_ID in this case instead
of the PERF_SAMPLE_ID as for sample events.. ? apart from
one more condition in __perf_evsel__calc_is_pos function.

AFAICS PERF_SAMPLE_STREAM_ID holds same id value as PERF_SAMPLE_ID,
but I guess it has some other meaning.. if not for now, maybe meant
something else for the future ;-) not sure

jirka

Re: [PATCH 12/15] perf tools: allow non-matching sample types

[David Ahern]

On 6/25/13 8:45 AM, Jiri Olsa wrote:
> AFAICS PERF_SAMPLE_STREAM_ID holds same id value as PERF_SAMPLE_ID,
> but I guess it has some other meaning.. if not for now, maybe meant
> something else for the future;-)  not sure

See 7f453c24.

David

Re: [PATCH 12/15] perf tools: allow non-matching sample types

[David Ahern]

On 6/24/13 7:16 AM, Adrian Hunter wrote:
> Sample types need not be identical to determine
> the sample id from the event.  Only the position
> of the sample id needs to be the same.
>
> Compatible sample types are ones in which the bits
> defined by PERF_COMPAT_MASK are the same.
> 'perf_evlist__config()' forces sample types to be
> compatible on that basis.

Something is still missing to support different sample_types for events. 
Consider the case (S/W event + tracepoint):
   perf record -e cs -c1 -e sched:sched_switch -a -- sleep 1
   perf script

This patch addresses the sample_type mismatch error message, but I get 
no event samples in the output. Besides the usual header I get:

   No trace sample to read. Did you call 'perf record -R'?

It's a 16-cpu box with 5 VMs running. I know there should be at least a 
few samples in 1 second.

Stephane: are you looking at allowing sample_types per event?

David

Re: [PATCH 15/15] perf tools: fix ppid in thread__fork()

[David Ahern]

On 6/24/13 7:16 AM, Adrian Hunter wrote:
> ppid should be assigned to the parents pid.  Note
> 'thread__fork()'s only caller 'machine__process_fork_event()'
> ensures that the parents pid is set.
>
> Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
> ---
>   tools/perf/util/thread.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/tools/perf/util/thread.c b/tools/perf/util/thread.c
> index e3d4a55..93f3eab 100644
> --- a/tools/perf/util/thread.c
> +++ b/tools/perf/util/thread.c
> @@ -85,7 +85,7 @@ int thread__fork(struct thread *self, struct thread *parent)
>   		if (map_groups__clone(&self->mg, &parent->mg, i) < 0)
>   			return -ENOMEM;
>
> -	self->ppid = parent->tid;
> +	self->ppid = parent->pid_;

Confused. My patch uses parent->pid and that it what I see in acme's 
perf/core branch. When did this become parent->tid?

David

Re: [PATCH 12/15] perf tools: allow non-matching sample types

[Stephane Eranian]

On Tue, Jun 25, 2013 at 5:56 PM, David Ahern <dsahern@gmail.com> wrote:
> On 6/24/13 7:16 AM, Adrian Hunter wrote:
>>
>> Sample types need not be identical to determine
>> the sample id from the event.  Only the position
>> of the sample id needs to be the same.
>>
>> Compatible sample types are ones in which the bits
>> defined by PERF_COMPAT_MASK are the same.
>> 'perf_evlist__config()' forces sample types to be
>> compatible on that basis.
>
>
> Something is still missing to support different sample_types for events.
> Consider the case (S/W event + tracepoint):
>   perf record -e cs -c1 -e sched:sched_switch -a -- sleep 1
>   perf script
>
> This patch addresses the sample_type mismatch error message, but I get no
> event samples in the output. Besides the usual header I get:
>
>   No trace sample to read. Did you call 'perf record -R'?
>
> It's a 16-cpu box with 5 VMs running. I know there should be at least a few
> samples in 1 second.
>
> Stephane: are you looking at allowing sample_types per event?
>
Yes, this is what I need. I have a kernel patch to do this. I don't
know how to update perf to handle it correctly. So maybe you can
help. My patch is useful to drastically reduce the size of the perf.data
file in case we use the branch-stack with lots of events which is
what our Gooda tool would like to do.

Re: [PATCH 15/15] perf tools: fix ppid in thread__fork()

[David Ahern]

On 6/25/13 10:00 AM, David Ahern wrote:
> On 6/24/13 7:16 AM, Adrian Hunter wrote:
>> ppid should be assigned to the parents pid.  Note
>> 'thread__fork()'s only caller 'machine__process_fork_event()'
>> ensures that the parents pid is set.
>>
>> Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
>> ---
>>   tools/perf/util/thread.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/tools/perf/util/thread.c b/tools/perf/util/thread.c
>> index e3d4a55..93f3eab 100644
>> --- a/tools/perf/util/thread.c
>> +++ b/tools/perf/util/thread.c
>> @@ -85,7 +85,7 @@ int thread__fork(struct thread *self, struct thread
>> *parent)
>>           if (map_groups__clone(&self->mg, &parent->mg, i) < 0)
>>               return -ENOMEM;
>>
>> -    self->ppid = parent->tid;
>> +    self->ppid = parent->pid_;
>
> Confused. My patch uses parent->pid and that it what I see in acme's
> perf/core branch. When did this become parent->tid?

Never mind. Scanned the patch subjects too quickly and jumped over 2 to 
get to this one.

David

Re: [PATCH 12/15] perf tools: allow non-matching sample types

[Jiri Olsa]

On Tue, Jun 25, 2013 at 09:42:53AM -0600, David Ahern wrote:
> On 6/25/13 8:45 AM, Jiri Olsa wrote:
> >AFAICS PERF_SAMPLE_STREAM_ID holds same id value as PERF_SAMPLE_ID,
> >but I guess it has some other meaning.. if not for now, maybe meant
> >something else for the future;-)  not sure
> 
> See 7f453c24.

thanks, 

hm.. I think I overlooked 'idx = 1' initialization in
__perf_evsel__calc_is_pos and the code IS actually using
PERF_SAMPLE_ID data.

jirka

Re: [PATCH 12/15] perf tools: allow non-matching sample types

[David Ahern]

On 6/25/13 10:03 AM, Stephane Eranian wrote:
>> Stephane: are you looking at allowing sample_types per event?
>> >
> Yes, this is what I need. I have a kernel patch to do this. I don't
> know how to update perf to handle it correctly. So maybe you can
> help. My patch is useful to drastically reduce the size of the perf.data
> file in case we use the branch-stack with lots of events which is
> what our Gooda tool would like to do.

Refreshing my memory on the root problem here. It's a chicken-and-egg 
problem: we need the id in the sample to find the event (evsel) that 
generated it (perf_evlist__id2evsel). To get the id we need the 
sample_type to parse it and we want the sample_type to be per event.

As I recall this is where the conversation turns to per-event data files...

David

Re: [PATCH 12/15] perf tools: allow non-matching sample types

[David Ahern]

On 6/25/13 5:04 PM, David Ahern wrote:
> On 6/25/13 10:03 AM, Stephane Eranian wrote:
>>> Stephane: are you looking at allowing sample_types per event?
>>> >
>> Yes, this is what I need. I have a kernel patch to do this. I don't
>> know how to update perf to handle it correctly. So maybe you can
>> help. My patch is useful to drastically reduce the size of the perf.data
>> file in case we use the branch-stack with lots of events which is
>> what our Gooda tool would like to do.
>
> Refreshing my memory on the root problem here. It's a chicken-and-egg
> problem: we need the id in the sample to find the event (evsel) that
> generated it (perf_evlist__id2evsel). To get the id we need the
> sample_type to parse it and we want the sample_type to be per event.
>
> As I recall this is where the conversation turns to per-event data files...

That said, this hack works for me with the combined S/W-tracepoint data 
file:

$ perf record -e cs -c1 -e sched:sched_switch -a -- sleep 1
$ perf script

It basically guesses which entry in the array has the id. (Ignore the 
whitespace ugliness - dev box expands tabs).

diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 89aea20..a6824b4 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -849,7 +849,20 @@ int perf_evlist__start_workload(struct perf_evlist 
*evlist)
  int perf_evlist__parse_sample(struct perf_evlist *evlist, union 
perf_event *event,
  			      struct perf_sample *sample)
  {
-	struct perf_evsel *evsel = perf_evlist__first(evlist);
+	struct perf_evsel *evsel;
+    const u64 *array = event->sample.array;
+    u64 id;
+    int n;
+
+    for (n = 0; n < 4; ++n) {
+        id = array[n];
+        evsel = perf_evlist__id2evsel(evlist, id);
+        if (evsel)
+            break;
+    }
+    if (evsel == NULL)
+        evsel = perf_evlist__first(evlist);
+
  	return perf_evsel__parse_sample(evsel, event, sample);
  }

diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index ad47fb9..dbbda09 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -61,10 +61,10 @@ static int perf_session__open(struct perf_session 
*self, bool force)
  		goto out_close;
  	}

-	if (!perf_evlist__valid_sample_type(self->evlist)) {
-		pr_err("non matching sample_type");
-		goto out_close;
-	}
+//	if (!perf_evlist__valid_sample_type(self->evlist)) {
+//		pr_err("non matching sample_type");
+//		goto out_close;
+//	}

  	if (!perf_evlist__valid_sample_id_all(self->evlist)) {
  		pr_err("non matching sample_id_all");
@@ -1295,10 +1295,15 @@ int perf_session__process_events(struct 
perf_session *self,

  bool perf_session__has_traces(struct perf_session *session, const char 
*msg)
  {
-	if (!(perf_evlist__sample_type(session->evlist) & PERF_SAMPLE_RAW)) {
-		pr_err("No trace sample to read. Did you call 'perf %s'?\n", msg);
-		return false;
-	}
+    struct perf_evsel *evsel;
+
+    list_for_each_entry(evsel, &session->evlist->entries, node) {
+		if ((evsel->attr.type == PERF_TYPE_TRACEPOINT) &&
+		   !(evsel->attr.sample_type & PERF_SAMPLE_RAW)) {
+			pr_err("No trace sample to read. Did you call 'perf %s'?\n", msg);
+			return false;
+		}
+    }

  	return true;
  }

Re: [PATCH 09/15] perf tools: validate perf event header size

[Namhyung Kim]

Hi Adrian,

On Mon, 24 Jun 2013 16:16:06 +0300, Adrian Hunter wrote:
> 'size' includes the header so must be at least
> 'sizeof(struct perf_event_header)'.  Error out
> immediately if that is not the case.  Also

Just out of curiosity.

Do you have an experience it really matters?  AFAICS such an invalid
sample should be detected during sample processing.

Thanks,
Namhyung

Re: [PATCH 12/15] perf tools: allow non-matching sample types

[David Ahern]

Arnaldo:

I noticed this patch in your perf/core branch. I do not think this one 
is ready to be committed. It does not fully solve the problem of 
allowing non-matching sample types.

I have a set of patches here on github that work fine for one use case 
-- mixed s/w and tracepoint events: 
https://github.com/dsahern/linux/tree/multiple-sample_type

I'll push the patches out, but wanted to run some more test cases first.

David

On 6/24/13 7:16 AM, Adrian Hunter wrote:
> Sample types need not be identical to determine
> the sample id from the event.  Only the position
> of the sample id needs to be the same.
>
> Compatible sample types are ones in which the bits
> defined by PERF_COMPAT_MASK are the same.
> 'perf_evlist__config()' forces sample types to be
> compatible on that basis.
>
> Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
> ---
>   tools/perf/util/event.h  |  6 ++++
>   tools/perf/util/evlist.c | 93 ++++++++++++++++++++++++++++++++++++++++++++++--
>   tools/perf/util/evlist.h |  3 ++
>   tools/perf/util/evsel.c  | 41 +++++++++++++++++++++
>   tools/perf/util/evsel.h  |  4 +++
>   5 files changed, 145 insertions(+), 2 deletions(-)
>
> diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
> index 1813895..858572f 100644
> --- a/tools/perf/util/event.h
> +++ b/tools/perf/util/event.h
> @@ -65,6 +65,12 @@ struct read_event {
>   	PERF_SAMPLE_ID | PERF_SAMPLE_STREAM_ID |	\
>   	 PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD)
>
> +#define PERF_COMPAT_MASK				\
> +	(PERF_SAMPLE_IP   | PERF_SAMPLE_TID       |	\
> +	 PERF_SAMPLE_TIME | PERF_SAMPLE_ADDR      |	\
> +	 PERF_SAMPLE_ID   | PERF_SAMPLE_STREAM_ID |	\
> +	 PERF_SAMPLE_CPU)
> +
>   struct sample_event {
>   	struct perf_event_header        header;
>   	u64 array[];
> diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
> index a660f56..85c4d91 100644
> --- a/tools/perf/util/evlist.c
> +++ b/tools/perf/util/evlist.c
> @@ -49,10 +49,20 @@ struct perf_evlist *perf_evlist__new(void)
>   	return evlist;
>   }
>
> +static void perf_evlist__set_id_pos(struct perf_evlist *evlist)
> +{
> +	struct perf_evsel *first = perf_evlist__first(evlist);
> +
> +	evlist->id_pos = first->id_pos;
> +	evlist->is_pos = first->is_pos;
> +}
> +
>   void perf_evlist__config(struct perf_evlist *evlist,
>   			struct perf_record_opts *opts)
>   {
>   	struct perf_evsel *evsel;
> +	u64 compat = 0;
> +
>   	/*
>   	 * Set the evsel leader links before we configure attributes,
>   	 * since some might depend on this info.
> @@ -68,7 +78,15 @@ void perf_evlist__config(struct perf_evlist *evlist,
>
>   		if (evlist->nr_entries > 1)
>   			perf_evsel__set_sample_id(evsel);
> +		compat |= evsel->attr.sample_type & PERF_COMPAT_MASK;
>   	}
> +
> +	list_for_each_entry(evsel, &evlist->entries, node) {
> +		evsel->attr.sample_type |= compat;
> +		perf_evsel__calc_id_pos(evsel);
> +	}
> +
> +	perf_evlist__set_id_pos(evlist);
>   }
>
>   static void perf_evlist__purge(struct perf_evlist *evlist)
> @@ -102,6 +120,7 @@ void perf_evlist__add(struct perf_evlist *evlist, struct perf_evsel *entry)
>   {
>   	list_add_tail(&entry->node, &evlist->entries);
>   	++evlist->nr_entries;
> +	perf_evlist__set_id_pos(evlist);
>   }
>
>   void perf_evlist__splice_list_tail(struct perf_evlist *evlist,
> @@ -110,6 +129,7 @@ void perf_evlist__splice_list_tail(struct perf_evlist *evlist,
>   {
>   	list_splice_tail(list, &evlist->entries);
>   	evlist->nr_entries += nr_entries;
> +	perf_evlist__set_id_pos(evlist);
>   }
>
>   void __perf_evlist__set_leader(struct list_head *list)
> @@ -339,6 +359,55 @@ struct perf_evsel *perf_evlist__id2evsel(struct perf_evlist *evlist, u64 id)
>   	return NULL;
>   }
>
> +static int perf_evlist__event2id(struct perf_evlist *evlist,
> +				 union perf_event *event, u64 *id)
> +{
> +	const u64 *array = event->sample.array;
> +	ssize_t n;
> +
> +	n = (event->header.size - sizeof(event->header)) >> 3;
> +
> +	if (event->header.type == PERF_RECORD_SAMPLE) {
> +		if (evlist->id_pos >= n)
> +			return -1;
> +		*id = array[evlist->id_pos];
> +	} else {
> +		if (evlist->is_pos >= n)
> +			return -1;
> +		n -= evlist->is_pos;
> +		*id = array[n];
> +	}
> +	return 0;
> +}
> +
> +static struct perf_evsel *perf_evlist__event2evsel(struct perf_evlist *evlist,
> +						   union perf_event *event)
> +{
> +	struct hlist_head *head;
> +	struct perf_sample_id *sid;
> +	int hash;
> +	u64 id;
> +
> +	if (evlist->nr_entries == 1 || evlist->matching_sample_types)
> +		return perf_evlist__first(evlist);
> +
> +	if (perf_evlist__event2id(evlist, event, &id))
> +		return NULL;
> +
> +	/* Synthesized events have an id of zero */
> +	if (!id)
> +		return perf_evlist__first(evlist);
> +
> +	hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
> +	head = &evlist->heads[hash];
> +
> +	hlist_for_each_entry(sid, head, node) {
> +		if (sid->id == id)
> +			return sid->evsel;
> +	}
> +	return NULL;
> +}
> +
>   union perf_event *perf_evlist__mmap_read(struct perf_evlist *evlist, int idx)
>   {
>   	struct perf_mmap *md = &evlist->mmap[idx];
> @@ -650,9 +719,26 @@ int perf_evlist__set_filter(struct perf_evlist *evlist, const char *filter)
>   bool perf_evlist__valid_sample_type(struct perf_evlist *evlist)
>   {
>   	struct perf_evsel *first = perf_evlist__first(evlist), *pos = first;
> +	bool ok = true;
>
>   	list_for_each_entry_continue(pos, &evlist->entries, node) {
> -		if (first->attr.sample_type != pos->attr.sample_type)
> +		if (first->attr.sample_type != pos->attr.sample_type) {
> +			ok = false;
> +			break;
> +		}
> +	}
> +
> +	if (ok) {
> +		evlist->matching_sample_types = true;
> +		return true;
> +	}
> +
> +	if (evlist->id_pos < 0 || evlist->is_pos < 0)
> +		return false;
> +
> +	list_for_each_entry(pos, &evlist->entries, node) {
> +		if (pos->id_pos != evlist->id_pos ||
> +		    pos->is_pos != evlist->is_pos)
>   			return false;
>   	}
>
> @@ -848,7 +934,10 @@ int perf_evlist__start_workload(struct perf_evlist *evlist)
>   int perf_evlist__parse_sample(struct perf_evlist *evlist, union perf_event *event,
>   			      struct perf_sample *sample)
>   {
> -	struct perf_evsel *evsel = perf_evlist__first(evlist);
> +	struct perf_evsel *evsel = perf_evlist__event2evsel(evlist, event);
> +
> +	if (!evsel)
> +		return -EFAULT;
>   	return perf_evsel__parse_sample(evsel, event, sample);
>   }
>
> diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h
> index 0583d36..bfcbf67 100644
> --- a/tools/perf/util/evlist.h
> +++ b/tools/perf/util/evlist.h
> @@ -32,11 +32,14 @@ struct perf_evlist {
>   	int		 nr_fds;
>   	int		 nr_mmaps;
>   	int		 mmap_len;
> +	int		 id_pos;
> +	int		 is_pos;
>   	struct {
>   		int	cork_fd;
>   		pid_t	pid;
>   	} workload;
>   	bool		 overwrite;
> +	bool		 matching_sample_types;
>   	struct perf_mmap *mmap;
>   	struct pollfd	 *pollfd;
>   	struct thread_map *threads;
> diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
> index d01d2cd..ee0f894 100644
> --- a/tools/perf/util/evsel.c
> +++ b/tools/perf/util/evsel.c
> @@ -46,6 +46,46 @@ static int __perf_evsel__sample_size(u64 sample_type)
>   	return size;
>   }
>
> +static int __perf_evsel__calc_id_pos(u64 sample_type)
> +{
> +	u64 mask;
> +	int i, idx;
> +
> +	if (!(sample_type & PERF_SAMPLE_ID))
> +		return -1;
> +
> +	mask = sample_type & (PERF_SAMPLE_ID - 1);
> +
> +	for (i = 0, idx = 0; i < 64; i++) {
> +		if (mask & (1ULL << i))
> +			idx++;
> +	}
> +
> +	return idx;
> +}
> +
> +static int __perf_evsel__calc_is_pos(u64 sample_type)
> +{
> +	int idx = 1;
> +
> +	if (!(sample_type & PERF_SAMPLE_ID))
> +		return -1;
> +
> +	if (sample_type & PERF_SAMPLE_CPU)
> +		idx += 1;
> +
> +	if (sample_type & PERF_SAMPLE_STREAM_ID)
> +		idx += 1;
> +
> +	return idx;
> +}
> +
> +void perf_evsel__calc_id_pos(struct perf_evsel *evsel)
> +{
> +	evsel->id_pos = __perf_evsel__calc_id_pos(evsel->attr.sample_type);
> +	evsel->is_pos = __perf_evsel__calc_is_pos(evsel->attr.sample_type);
> +}
> +
>   void hists__init(struct hists *hists)
>   {
>   	memset(hists, 0, sizeof(*hists));
> @@ -89,6 +129,7 @@ void perf_evsel__init(struct perf_evsel *evsel,
>   	INIT_LIST_HEAD(&evsel->node);
>   	hists__init(&evsel->hists);
>   	evsel->sample_size = __perf_evsel__sample_size(attr->sample_type);
> +	perf_evsel__calc_id_pos(evsel);
>   }
>
>   struct perf_evsel *perf_evsel__new(struct perf_event_attr *attr, int idx)
> diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
> index 3f156cc..88b4319 100644
> --- a/tools/perf/util/evsel.h
> +++ b/tools/perf/util/evsel.h
> @@ -71,6 +71,8 @@ struct perf_evsel {
>   	} handler;
>   	struct cpu_map		*cpus;
>   	unsigned int		sample_size;
> +	int			id_pos;
> +	int			is_pos;
>   	bool 			supported;
>   	bool 			needs_swap;
>   	/* parse modifier helper */
> @@ -100,6 +102,8 @@ void perf_evsel__delete(struct perf_evsel *evsel);
>   void perf_evsel__config(struct perf_evsel *evsel,
>   			struct perf_record_opts *opts);
>
> +void perf_evsel__calc_id_pos(struct perf_evsel *evsel);
> +
>   bool perf_evsel__is_cache_op_valid(u8 type, u8 op);
>
>   #define PERF_EVSEL__MAX_ALIASES 8
>

Re: [PATCH 12/15] perf tools: allow non-matching sample types

[Stephane Eranian]

On Wed, Jun 26, 2013 at 10:48 PM, David Ahern <dsahern@gmail.com> wrote:
> Arnaldo:
>
> I noticed this patch in your perf/core branch. I do not think this one is
> ready to be committed. It does not fully solve the problem of allowing
> non-matching sample types.
>
> I have a set of patches here on github that work fine for one use case --
> mixed s/w and tracepoint events:
> https://github.com/dsahern/linux/tree/multiple-sample_type
>
> I'll push the patches out, but wanted to run some more test cases first.
>
All those solutions address the need of perf but they do not fix the fundamental
problem that the kernel is exporting a un-parseable file in case of different
sample_type for each event. We need to fix the generic case so that other
tools don't have to deal with this. I will post a patch which can solve this
in the kernel and yet remain backward compatible. But I don't  have the
perf portion of the patch, hoping somebody can help with developing it.


> David
>
>
> On 6/24/13 7:16 AM, Adrian Hunter wrote:
>>
>> Sample types need not be identical to determine
>> the sample id from the event.  Only the position
>> of the sample id needs to be the same.
>>
>> Compatible sample types are ones in which the bits
>> defined by PERF_COMPAT_MASK are the same.
>> 'perf_evlist__config()' forces sample types to be
>> compatible on that basis.
>>
>> Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
>> ---
>>   tools/perf/util/event.h  |  6 ++++
>>   tools/perf/util/evlist.c | 93
>> ++++++++++++++++++++++++++++++++++++++++++++++--
>>   tools/perf/util/evlist.h |  3 ++
>>   tools/perf/util/evsel.c  | 41 +++++++++++++++++++++
>>   tools/perf/util/evsel.h  |  4 +++
>>   5 files changed, 145 insertions(+), 2 deletions(-)
>>
>> diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
>> index 1813895..858572f 100644
>> --- a/tools/perf/util/event.h
>> +++ b/tools/perf/util/event.h
>> @@ -65,6 +65,12 @@ struct read_event {
>>         PERF_SAMPLE_ID | PERF_SAMPLE_STREAM_ID |        \
>>          PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD)
>>
>> +#define PERF_COMPAT_MASK                               \
>> +       (PERF_SAMPLE_IP   | PERF_SAMPLE_TID       |     \
>> +        PERF_SAMPLE_TIME | PERF_SAMPLE_ADDR      |     \
>> +        PERF_SAMPLE_ID   | PERF_SAMPLE_STREAM_ID |     \
>> +        PERF_SAMPLE_CPU)
>> +
>>   struct sample_event {
>>         struct perf_event_header        header;
>>         u64 array[];
>> diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
>> index a660f56..85c4d91 100644
>> --- a/tools/perf/util/evlist.c
>> +++ b/tools/perf/util/evlist.c
>> @@ -49,10 +49,20 @@ struct perf_evlist *perf_evlist__new(void)
>>         return evlist;
>>   }
>>
>> +static void perf_evlist__set_id_pos(struct perf_evlist *evlist)
>> +{
>> +       struct perf_evsel *first = perf_evlist__first(evlist);
>> +
>> +       evlist->id_pos = first->id_pos;
>> +       evlist->is_pos = first->is_pos;
>> +}
>> +
>>   void perf_evlist__config(struct perf_evlist *evlist,
>>                         struct perf_record_opts *opts)
>>   {
>>         struct perf_evsel *evsel;
>> +       u64 compat = 0;
>> +
>>         /*
>>          * Set the evsel leader links before we configure attributes,
>>          * since some might depend on this info.
>> @@ -68,7 +78,15 @@ void perf_evlist__config(struct perf_evlist *evlist,
>>
>>                 if (evlist->nr_entries > 1)
>>                         perf_evsel__set_sample_id(evsel);
>> +               compat |= evsel->attr.sample_type & PERF_COMPAT_MASK;
>>         }
>> +
>> +       list_for_each_entry(evsel, &evlist->entries, node) {
>> +               evsel->attr.sample_type |= compat;
>> +               perf_evsel__calc_id_pos(evsel);
>> +       }
>> +
>> +       perf_evlist__set_id_pos(evlist);
>>   }
>>
>>   static void perf_evlist__purge(struct perf_evlist *evlist)
>> @@ -102,6 +120,7 @@ void perf_evlist__add(struct perf_evlist *evlist,
>> struct perf_evsel *entry)
>>   {
>>         list_add_tail(&entry->node, &evlist->entries);
>>         ++evlist->nr_entries;
>> +       perf_evlist__set_id_pos(evlist);
>>   }
>>
>>   void perf_evlist__splice_list_tail(struct perf_evlist *evlist,
>> @@ -110,6 +129,7 @@ void perf_evlist__splice_list_tail(struct perf_evlist
>> *evlist,
>>   {
>>         list_splice_tail(list, &evlist->entries);
>>         evlist->nr_entries += nr_entries;
>> +       perf_evlist__set_id_pos(evlist);
>>   }
>>
>>   void __perf_evlist__set_leader(struct list_head *list)
>> @@ -339,6 +359,55 @@ struct perf_evsel *perf_evlist__id2evsel(struct
>> perf_evlist *evlist, u64 id)
>>         return NULL;
>>   }
>>
>> +static int perf_evlist__event2id(struct perf_evlist *evlist,
>> +                                union perf_event *event, u64 *id)
>> +{
>> +       const u64 *array = event->sample.array;
>> +       ssize_t n;
>> +
>> +       n = (event->header.size - sizeof(event->header)) >> 3;
>> +
>> +       if (event->header.type == PERF_RECORD_SAMPLE) {
>> +               if (evlist->id_pos >= n)
>> +                       return -1;
>> +               *id = array[evlist->id_pos];
>> +       } else {
>> +               if (evlist->is_pos >= n)
>> +                       return -1;
>> +               n -= evlist->is_pos;
>> +               *id = array[n];
>> +       }
>> +       return 0;
>> +}
>> +
>> +static struct perf_evsel *perf_evlist__event2evsel(struct perf_evlist
>> *evlist,
>> +                                                  union perf_event
>> *event)
>> +{
>> +       struct hlist_head *head;
>> +       struct perf_sample_id *sid;
>> +       int hash;
>> +       u64 id;
>> +
>> +       if (evlist->nr_entries == 1 || evlist->matching_sample_types)
>> +               return perf_evlist__first(evlist);
>> +
>> +       if (perf_evlist__event2id(evlist, event, &id))
>> +               return NULL;
>> +
>> +       /* Synthesized events have an id of zero */
>> +       if (!id)
>> +               return perf_evlist__first(evlist);
>> +
>> +       hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
>> +       head = &evlist->heads[hash];
>> +
>> +       hlist_for_each_entry(sid, head, node) {
>> +               if (sid->id == id)
>> +                       return sid->evsel;
>> +       }
>> +       return NULL;
>> +}
>> +
>>   union perf_event *perf_evlist__mmap_read(struct perf_evlist *evlist, int
>> idx)
>>   {
>>         struct perf_mmap *md = &evlist->mmap[idx];
>> @@ -650,9 +719,26 @@ int perf_evlist__set_filter(struct perf_evlist
>> *evlist, const char *filter)
>>   bool perf_evlist__valid_sample_type(struct perf_evlist *evlist)
>>   {
>>         struct perf_evsel *first = perf_evlist__first(evlist), *pos =
>> first;
>> +       bool ok = true;
>>
>>         list_for_each_entry_continue(pos, &evlist->entries, node) {
>> -               if (first->attr.sample_type != pos->attr.sample_type)
>> +               if (first->attr.sample_type != pos->attr.sample_type) {
>> +                       ok = false;
>> +                       break;
>> +               }
>> +       }
>> +
>> +       if (ok) {
>> +               evlist->matching_sample_types = true;
>> +               return true;
>> +       }
>> +
>> +       if (evlist->id_pos < 0 || evlist->is_pos < 0)
>> +               return false;
>> +
>> +       list_for_each_entry(pos, &evlist->entries, node) {
>> +               if (pos->id_pos != evlist->id_pos ||
>> +                   pos->is_pos != evlist->is_pos)
>>                         return false;
>>         }
>>
>> @@ -848,7 +934,10 @@ int perf_evlist__start_workload(struct perf_evlist
>> *evlist)
>>   int perf_evlist__parse_sample(struct perf_evlist *evlist, union
>> perf_event *event,
>>                               struct perf_sample *sample)
>>   {
>> -       struct perf_evsel *evsel = perf_evlist__first(evlist);
>> +       struct perf_evsel *evsel = perf_evlist__event2evsel(evlist,
>> event);
>> +
>> +       if (!evsel)
>> +               return -EFAULT;
>>         return perf_evsel__parse_sample(evsel, event, sample);
>>   }
>>
>> diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h
>> index 0583d36..bfcbf67 100644
>> --- a/tools/perf/util/evlist.h
>> +++ b/tools/perf/util/evlist.h
>> @@ -32,11 +32,14 @@ struct perf_evlist {
>>         int              nr_fds;
>>         int              nr_mmaps;
>>         int              mmap_len;
>> +       int              id_pos;
>> +       int              is_pos;
>>         struct {
>>                 int     cork_fd;
>>                 pid_t   pid;
>>         } workload;
>>         bool             overwrite;
>> +       bool             matching_sample_types;
>>         struct perf_mmap *mmap;
>>         struct pollfd    *pollfd;
>>         struct thread_map *threads;
>> diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
>> index d01d2cd..ee0f894 100644
>> --- a/tools/perf/util/evsel.c
>> +++ b/tools/perf/util/evsel.c
>> @@ -46,6 +46,46 @@ static int __perf_evsel__sample_size(u64 sample_type)
>>         return size;
>>   }
>>
>> +static int __perf_evsel__calc_id_pos(u64 sample_type)
>> +{
>> +       u64 mask;
>> +       int i, idx;
>> +
>> +       if (!(sample_type & PERF_SAMPLE_ID))
>> +               return -1;
>> +
>> +       mask = sample_type & (PERF_SAMPLE_ID - 1);
>> +
>> +       for (i = 0, idx = 0; i < 64; i++) {
>> +               if (mask & (1ULL << i))
>> +                       idx++;
>> +       }
>> +
>> +       return idx;
>> +}
>> +
>> +static int __perf_evsel__calc_is_pos(u64 sample_type)
>> +{
>> +       int idx = 1;
>> +
>> +       if (!(sample_type & PERF_SAMPLE_ID))
>> +               return -1;
>> +
>> +       if (sample_type & PERF_SAMPLE_CPU)
>> +               idx += 1;
>> +
>> +       if (sample_type & PERF_SAMPLE_STREAM_ID)
>> +               idx += 1;
>> +
>> +       return idx;
>> +}
>> +
>> +void perf_evsel__calc_id_pos(struct perf_evsel *evsel)
>> +{
>> +       evsel->id_pos =
>> __perf_evsel__calc_id_pos(evsel->attr.sample_type);
>> +       evsel->is_pos =
>> __perf_evsel__calc_is_pos(evsel->attr.sample_type);
>> +}
>> +
>>   void hists__init(struct hists *hists)
>>   {
>>         memset(hists, 0, sizeof(*hists));
>> @@ -89,6 +129,7 @@ void perf_evsel__init(struct perf_evsel *evsel,
>>         INIT_LIST_HEAD(&evsel->node);
>>         hists__init(&evsel->hists);
>>         evsel->sample_size = __perf_evsel__sample_size(attr->sample_type);
>> +       perf_evsel__calc_id_pos(evsel);
>>   }
>>
>>   struct perf_evsel *perf_evsel__new(struct perf_event_attr *attr, int
>> idx)
>> diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
>> index 3f156cc..88b4319 100644
>> --- a/tools/perf/util/evsel.h
>> +++ b/tools/perf/util/evsel.h
>> @@ -71,6 +71,8 @@ struct perf_evsel {
>>         } handler;
>>         struct cpu_map          *cpus;
>>         unsigned int            sample_size;
>> +       int                     id_pos;
>> +       int                     is_pos;
>>         bool                    supported;
>>         bool                    needs_swap;
>>         /* parse modifier helper */
>> @@ -100,6 +102,8 @@ void perf_evsel__delete(struct perf_evsel *evsel);
>>   void perf_evsel__config(struct perf_evsel *evsel,
>>                         struct perf_record_opts *opts);
>>
>> +void perf_evsel__calc_id_pos(struct perf_evsel *evsel);
>> +
>>   bool perf_evsel__is_cache_op_valid(u8 type, u8 op);
>>
>>   #define PERF_EVSEL__MAX_ALIASES 8
>>
>

Re: [PATCH 12/15] perf tools: allow non-matching sample types

[David Ahern]

On 6/26/13 2:54 PM, Stephane Eranian wrote:
> On Wed, Jun 26, 2013 at 10:48 PM, David Ahern <dsahern@gmail.com> wrote:
>> Arnaldo:
>>
>> I noticed this patch in your perf/core branch. I do not think this one is
>> ready to be committed. It does not fully solve the problem of allowing
>> non-matching sample types.
>>
>> I have a set of patches here on github that work fine for one use case --
>> mixed s/w and tracepoint events:
>> https://github.com/dsahern/linux/tree/multiple-sample_type
>>
>> I'll push the patches out, but wanted to run some more test cases first.
>>
> All those solutions address the need of perf but they do not fix the fundamental
> problem that the kernel is exporting a un-parseable file in case of different
> sample_type for each event. We need to fix the generic case so that other
> tools don't have to deal with this. I will post a patch which can solve this
> in the kernel and yet remain backward compatible. But I don't  have the
> perf portion of the patch, hoping somebody can help with developing it.

The patchset in the URL above attempts to find the id which correlates 
to the evsel which has the sample_type. It starts at the max index (IP, 
TID, TIME and ADDR all requested which means an index of 4 for the ID) 
and then works its way in (meaning one of the above is not requested).

Would be better for the event sample to put the id at the front or the 
sample_type at the front, but that ship has sailed. It would be nice to 
have a userspace option that works with existing kernels.

I'll take a look at your kernel change when you post it to see what I am 
overlooking here but the patches have worked fine for me so far.

David

Re: [PATCH 12/15] perf tools: allow non-matching sample types

[Stephane Eranian]

On Wed, Jun 26, 2013 at 11:00 PM, David Ahern <dsahern@gmail.com> wrote:
> On 6/26/13 2:54 PM, Stephane Eranian wrote:
>>
>> On Wed, Jun 26, 2013 at 10:48 PM, David Ahern <dsahern@gmail.com> wrote:
>>>
>>> Arnaldo:
>>>
>>> I noticed this patch in your perf/core branch. I do not think this one is
>>> ready to be committed. It does not fully solve the problem of allowing
>>> non-matching sample types.
>>>
>>> I have a set of patches here on github that work fine for one use case --
>>> mixed s/w and tracepoint events:
>>> https://github.com/dsahern/linux/tree/multiple-sample_type
>>>
>>> I'll push the patches out, but wanted to run some more test cases first.
>>>
>> All those solutions address the need of perf but they do not fix the
>> fundamental
>> problem that the kernel is exporting a un-parseable file in case of
>> different
>> sample_type for each event. We need to fix the generic case so that other
>> tools don't have to deal with this. I will post a patch which can solve
>> this
>> in the kernel and yet remain backward compatible. But I don't  have the
>> perf portion of the patch, hoping somebody can help with developing it.
>
>
> The patchset in the URL above attempts to find the id which correlates to
> the evsel which has the sample_type. It starts at the max index (IP, TID,
> TIME and ADDR all requested which means an index of 4 for the ID) and then
> works its way in (meaning one of the above is not requested).
>
But you realize that imposing this kind of iterative search on all the tools
is not very good. it probably solves it for perf and the way perf tracks
the  per-event info, but they ought to be something simpler to do.


> Would be better for the event sample to put the id at the front or the
> sample_type at the front, but that ship has sailed. It would be nice to have
> a userspace option that works with existing kernels.
>
> I'll take a look at your kernel change when you post it to see what I am
> overlooking here but the patches have worked fine for me so far.
>
> David
>

Re: [PATCH 12/15] perf tools: allow non-matching sample types

[Adrian Hunter]

On 25/06/13 15:32, Jiri Olsa wrote:
> On Mon, Jun 24, 2013 at 04:16:09PM +0300, Adrian Hunter wrote:
>> Sample types need not be identical to determine
>> the sample id from the event.  Only the position
>> of the sample id needs to be the same.
>>
>> Compatible sample types are ones in which the bits
>> defined by PERF_COMPAT_MASK are the same.
>> 'perf_evlist__config()' forces sample types to be
>> compatible on that basis.
> 
> hi,
> one of the patches is breaking test 4:
> 
> [jolsa@krava perf]$ sudo ./perf test
>  1: vmlinux symtab matches kallsyms                        : Ok
>  2: detect open syscall event                              : Ok
>  3: detect open syscall event on all cpus                  : Ok
>  4: read samples using the mmap interface                  :Can't parse sample, err = -14
>  FAILED!
> 
> haven't checked deeply, but my guess is this one ;-)

Thanks for testing.  Fixed in V2.

Re: [PATCH 02/15] perf tools: fix missing tool parameter

[Adrian Hunter]

On 25/06/13 16:04, Jiri Olsa wrote:
> On Mon, Jun 24, 2013 at 04:15:59PM +0300, Adrian Hunter wrote:
>> perf inject expects to get a reference to 'struct perf_inject'
>> from its 'tool' member.  For that to work, 'tool' needs to be
>> a parameter of all tool callbacks.  Make it so.
>>
>> Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
>> ---
>>  tools/perf/builtin-inject.c | 24 ++++++++++--------------
>>  tools/perf/util/header.c    |  6 ++++--
>>  tools/perf/util/header.h    |  6 ++++--
>>  tools/perf/util/session.c   | 11 +++++++----
>>  tools/perf/util/tool.h      |  9 ++++-----
>>  5 files changed, 29 insertions(+), 27 deletions(-)
>>
>> diff --git a/tools/perf/builtin-inject.c b/tools/perf/builtin-inject.c
>> index f299ddf..fb341f1 100644
>> --- a/tools/perf/builtin-inject.c
>> +++ b/tools/perf/builtin-inject.c
>> @@ -73,22 +73,17 @@ static int perf_event__repipe_event_type_synth(struct perf_tool *tool,
>>  	return perf_event__repipe_synth(tool, event);
>>  }
>>  
>> -static int perf_event__repipe_tracing_data_synth(union perf_event *event,
>> -						 struct perf_session *session
>> -						 __maybe_unused)
>> -{
>> -	return perf_event__repipe_synth(NULL, event);
>> -}
>> -
>> -static int perf_event__repipe_attr(union perf_event *event,
>> -				   struct perf_evlist **pevlist __maybe_unused)
>> +static int perf_event__repipe_attr(struct perf_tool *tool,
>> +				   union perf_event *event,
>> +				   struct perf_evlist **pevlist)
>>  {
>>  	int ret;
>> -	ret = perf_event__process_attr(event, pevlist);
>> +
>> +	ret = perf_event__process_attr(tool, event, pevlist);
>>  	if (ret)
>>  		return ret;
>>  
>> -	return perf_event__repipe_synth(NULL, event);
>> +	return perf_event__repipe_synth(tool, event);
>>  }
>>  
>>  static int perf_event__repipe(struct perf_tool *tool,
>> @@ -147,13 +142,14 @@ static int perf_event__repipe_fork(struct perf_tool *tool,
>>  	return err;
>>  }
>>  
>> -static int perf_event__repipe_tracing_data(union perf_event *event,
>> +static int perf_event__repipe_tracing_data(struct perf_tool *tool,
>> +					   union perf_event *event,
>>  					   struct perf_session *session)
>>  {
>>  	int err;
>>  
>>  	perf_event__repipe_synth(NULL, event);
> 
> wouldn't this one cause segfault?

Thanks for reviewing.  Fixed in V2.

Re: [PATCH 06/15] perf tools: fix parse_events_terms() freeing local variable on error path

[Adrian Hunter]

On 25/06/13 16:13, Jiri Olsa wrote:
> On Mon, Jun 24, 2013 at 04:16:03PM +0300, Adrian Hunter wrote:
>> The list_head is on the stack, so just free the rest of the list.
>>
>> Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
>> ---
>>  tools/perf/util/pmu.c | 3 ++-
>>  1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
>> index 4c6f9c4..def64d4 100644
>> --- a/tools/perf/util/pmu.c
>> +++ b/tools/perf/util/pmu.c
>> @@ -194,7 +194,8 @@ static int pmu_alias_terms(struct perf_pmu_alias *alias,
>>  	list_for_each_entry(term, &alias->terms, list) {
>>  		ret = parse_events_term__clone(&clone, term);
>>  		if (ret) {
>> -			parse_events__free_terms(&list);
>> +			list_for_each_entry_safe(term, clone, &list, list)
>> +				free(term);
> 
> Could you please add __parse_events__free_terms doing this
> and being called from parse_events__free_terms as you did
> for __perf_evlist__munmap in the other patch.

Thanks for reviewing.  Fixed in V2.

Re: [PATCH 09/15] perf tools: validate perf event header size

[Adrian Hunter]

On 25/06/13 16:18, Jiri Olsa wrote:
> On Mon, Jun 24, 2013 at 04:16:06PM +0300, Adrian Hunter wrote:
>> 'size' includes the header so must be at least
>> 'sizeof(struct perf_event_header)'.  Error out
>> immediately if that is not the case.  Also
>> don't byte-swap the header until it is actually
>> "fetched" from the mmap region.
>>
>> Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
>> ---
>>  tools/perf/util/session.c | 14 ++++++++------
>>  1 file changed, 8 insertions(+), 6 deletions(-)
>>
>> diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
>> index 19ea888..7e0d605 100644
>> --- a/tools/perf/util/session.c
>> +++ b/tools/perf/util/session.c
>> @@ -1094,8 +1094,10 @@ more:
>>  		perf_event_header__bswap(&event->header);
>>  
>>  	size = event->header.size;
>> -	if (size == 0)
>> -		size = 8;
>> +	if (size < sizeof(struct perf_event_header)) {
>> +		pr_err("bad event header size\n");
>> +		goto out_err;
>> +	}
>>  
>>  	if (size > cur_size) {
>>  		void *new = realloc(buf, size);
>> @@ -1161,12 +1163,12 @@ fetch_mmaped_event(struct perf_session *session,
>>  
>>  	event = (union perf_event *)(buf + head);
>>  
>> -	if (session->header.needs_swap)
>> -		perf_event_header__bswap(&event->header);
>> -
>>  	if (head + event->header.size > mmap_size)
>>  		return NULL;
> 
> dont we need to swap first before using event->header.size?

Thanks for reviewing.  Fixed in V2.

Re: [PATCH 09/15] perf tools: validate perf event header size

[Adrian Hunter]

On 26/06/13 04:44, Namhyung Kim wrote:
> Hi Adrian,
> 
> On Mon, 24 Jun 2013 16:16:06 +0300, Adrian Hunter wrote:
>> 'size' includes the header so must be at least
>> 'sizeof(struct perf_event_header)'.  Error out
>> immediately if that is not the case.  Also
> 
> Just out of curiosity.
> 
> Do you have an experience it really matters?  AFAICS such an invalid
> sample should be detected during sample processing.

The patch was written a long time ago so I don't remember sorry.

Re: [PATCH 12/15] perf tools: allow non-matching sample types

[Adrian Hunter]

On 25/06/13 18:56, David Ahern wrote:
> On 6/24/13 7:16 AM, Adrian Hunter wrote:
>> Sample types need not be identical to determine
>> the sample id from the event.  Only the position
>> of the sample id needs to be the same.
>>
>> Compatible sample types are ones in which the bits
>> defined by PERF_COMPAT_MASK are the same.
>> 'perf_evlist__config()' forces sample types to be
>> compatible on that basis.
> 
> Something is still missing to support different sample_types for events.
> Consider the case (S/W event + tracepoint):
>   perf record -e cs -c1 -e sched:sched_switch -a -- sleep 1
>   perf script
> 
> This patch addresses the sample_type mismatch error message, but I get no
> event samples in the output. Besides the usual header I get:
> 
>   No trace sample to read. Did you call 'perf record -R'?

Fixed in V2

> 
> It's a 16-cpu box with 5 VMs running. I know there should be at least a few
> samples in 1 second.
> 
> Stephane: are you looking at allowing sample_types per event?
> 
> David
> 
>