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perf tools: Use target->per_thread and target->system_wide flags 

Mathieu Poirier reports issue in commit ("73c0ca1eee3d perf thread_map:
Enumerate all threads from /proc") that it has negative impact on 'perf
record --per-thread'. It has the effect of creating a kernel event for
each thread in the system for 'perf record --per-thread'.

Mathieu Poirier's patch ("perf util: Do not reuse target->per_thread flag")
can fix this issue by creating a new target->all_threads flag.

This patch is based on Mathieu Poirier's patch but it doesn't use a new
target->all_threads flag. This patch just uses 'target->per_thread &&
target->system_wide' as a condition to check for all threads case.

Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: linux-arm-kernel@lists.infradead.org
Fixes: 73c0ca1eee ("perf thread_map: Enumerate all threads from /proc")
Link: http://lkml.kernel.org/r/1518467557-18505-3-git-send-email-mathieu.poirier@linaro.org
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
[Fixed checkpatch warning about line over 80 characters]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jin Yao 2018-02-12 13:32:36 -07:00 committed by Arnaldo Carvalho de Melo
parent 099c113099
commit 147c508f30
3 changed files with 23 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
tools/perf/util/evlist.c
View File

@ -1086,11 +1086,30 @@ int perf_evlist__mmap(struct perf_evlist *evlist, unsigned int pages)
int perf_evlist__create_maps(struct perf_evlist *evlist, struct target *target)
{
bool all_threads = (target->per_thread && target->system_wide);
struct cpu_map *cpus;
struct thread_map *threads;
/*
* If specify '-a' and '--per-thread' to perf record, perf record
* will override '--per-thread'. target->per_thread = false and
* target->system_wide = true.
*
* If specify '--per-thread' only to perf record,
* target->per_thread = true and target->system_wide = false.
*
* So target->per_thread && target->system_wide is false.
* For perf record, thread_map__new_str doesn't call
* thread_map__new_all_cpus. That will keep perf record's
* current behavior.
*
* For perf stat, it allows the case that target->per_thread and
* target->system_wide are all true. It means to collect system-wide
* per-thread data. thread_map__new_str will call
* thread_map__new_all_cpus to enumerate all threads.
*/
threads = thread_map__new_str(target->pid, target->tid, target->uid,
target->per_thread);
all_threads);
if (!threads)
return -1;

4
tools/perf/util/thread_map.c
View File

@ -323,7 +323,7 @@ out_free_threads:
}
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);

2
tools/perf/util/thread_map.h
View File

@ -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);