linux-kernel - [PATCH 1/1] perf util: Do not reuse target->per

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Message-Id: <1515798743-2541-2-git-send-email-mathieu.poirier@linaro.org>
Date:   Fri, 12 Jan 2018 16:12:23 -0700
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     acme@...nel.org
Cc:     peterz@...radead.org, mingo@...hat.com,
        alexander.shishkin@...ux.intel.com, jolsa@...hat.com,
        namhyung@...nel.org, yao.jin@...ux.intel.com,
        linux-kernel@...r.kernel.org
Subject: [PATCH 1/1] perf util: Do not reuse target->per_thread flag

Commit ("73c0ca1eee3d perf thread_map: Enumerate all threads from /proc")
is using the target->per_thread flag to specify that all threads in a
system should be taken into account.  That is then used in function
thread_map__new_str() where all threads are added to evlist->threads.

Variable target->per_thread is also used by 'perf record' when handling
trace sessions using the --per-thread command line option.  Since the
target->per_thread flag is set all threads will be added to
evlist->threads, which has the effect of creating a kernel event for each
thread in the system.

This patch address the issue by creating a new target->all_threads flag
that gets set from the 'stat' utility, avoiding any conflict with other
utilities using target->per_thread.

Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
---
 tools/perf/builtin-stat.c    | 2 +-
 tools/perf/util/evlist.c     | 2 +-
 tools/perf/util/target.h     | 1 +
 tools/perf/util/thread_map.c | 4 ++--
 tools/perf/util/thread_map.h | 2 +-
 5 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 98bf9d32f222..87e156bfb45e 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -2831,7 +2831,7 @@ int cmd_stat(int argc, const char **argv)
 	target__validate(&target);
 
 	if ((stat_config.aggr_mode == AGGR_THREAD) && (target.system_wide))
-		target.per_thread = true;
+		target.per_thread = target.all_threads = true;
 
 	if (perf_evlist__create_maps(evsel_list, &target) < 0) {
 		if (target__has_task(&target)) {
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index f0a5e09c4071..c239eb895612 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -1106,7 +1106,7 @@ int perf_evlist__create_maps(struct perf_evlist *evlist, struct target *target)
 	struct thread_map *threads;
 
 	threads = thread_map__new_str(target->pid, target->tid, target->uid,
-				      target->per_thread);
+				      target->all_threads);
 
 	if (!threads)
 		return -1;
diff --git a/tools/perf/util/target.h b/tools/perf/util/target.h
index 6ef01a83b24e..0da8ea2b6801 100644
--- a/tools/perf/util/target.h
+++ b/tools/perf/util/target.h
@@ -15,6 +15,7 @@ struct target {
 	bool	     uses_mmap;
 	bool	     default_per_cpu;
 	bool	     per_thread;
+	bool	     all_threads;
 };
 
 enum target_errno {
diff --git a/tools/perf/util/thread_map.c b/tools/perf/util/thread_map.c
index 3e1038f6491c..729dad8f412d 100644
--- a/tools/perf/util/thread_map.c
+++ b/tools/perf/util/thread_map.c
@@ -323,7 +323,7 @@ struct thread_map *thread_map__new_by_tid_str(const char *tid_str)
 }
 
 struct thread_map *thread_map__new_str(const char *pid, const char *tid,
-				       uid_t uid, bool per_thread)
+				       uid_t uid, bool all_threads)
 {
 	if (pid)
 		return thread_map__new_by_pid_str(pid);
@@ -331,7 +331,7 @@ struct thread_map *thread_map__new_str(const char *pid, const char *tid,
 	if (!tid && uid != UINT_MAX)
 		return thread_map__new_by_uid(uid);
 
-	if (per_thread)
+	if (all_threads)
 		return thread_map__new_all_cpus();
 
 	return thread_map__new_by_tid_str(tid);
diff --git a/tools/perf/util/thread_map.h b/tools/perf/util/thread_map.h
index 0a806b99e73c..5ec91cfd1869 100644
--- a/tools/perf/util/thread_map.h
+++ b/tools/perf/util/thread_map.h
@@ -31,7 +31,7 @@ struct thread_map *thread_map__get(struct thread_map *map);
 void thread_map__put(struct thread_map *map);
 
 struct thread_map *thread_map__new_str(const char *pid,
-		const char *tid, uid_t uid, bool per_thread);
+		const char *tid, uid_t uid, bool all_threads);
 
 struct thread_map *thread_map__new_by_tid_str(const char *tid_str);
 
-- 
2.7.4