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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:
parent
099c113099
commit
147c508f30
@ -1086,11 +1086,30 @@ int perf_evlist__mmap(struct perf_evlist *evlist, unsigned int pages)
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int perf_evlist__create_maps(struct perf_evlist *evlist, struct target *target)
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{
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bool all_threads = (target->per_thread && target->system_wide);
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struct cpu_map *cpus;
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struct thread_map *threads;
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/*
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* If specify '-a' and '--per-thread' to perf record, perf record
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* will override '--per-thread'. target->per_thread = false and
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* target->system_wide = true.
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*
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* If specify '--per-thread' only to perf record,
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* target->per_thread = true and target->system_wide = false.
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*
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* So target->per_thread && target->system_wide is false.
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* For perf record, thread_map__new_str doesn't call
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* thread_map__new_all_cpus. That will keep perf record's
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* current behavior.
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*
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* For perf stat, it allows the case that target->per_thread and
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* target->system_wide are all true. It means to collect system-wide
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* per-thread data. thread_map__new_str will call
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* thread_map__new_all_cpus to enumerate all threads.
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*/
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threads = thread_map__new_str(target->pid, target->tid, target->uid,
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target->per_thread);
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all_threads);
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if (!threads)
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return -1;
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@ -323,7 +323,7 @@ struct thread_map *thread_map__new_by_tid_str(const char *tid_str)
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}
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struct thread_map *thread_map__new_str(const char *pid, const char *tid,
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uid_t uid, bool per_thread)
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uid_t uid, bool all_threads)
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{
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if (pid)
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return thread_map__new_by_pid_str(pid);
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@ -331,7 +331,7 @@ struct thread_map *thread_map__new_str(const char *pid, const char *tid,
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if (!tid && uid != UINT_MAX)
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return thread_map__new_by_uid(uid);
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if (per_thread)
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if (all_threads)
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return thread_map__new_all_cpus();
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return thread_map__new_by_tid_str(tid);
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@ -31,7 +31,7 @@ struct thread_map *thread_map__get(struct thread_map *map);
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void thread_map__put(struct thread_map *map);
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struct thread_map *thread_map__new_str(const char *pid,
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const char *tid, uid_t uid, bool per_thread);
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const char *tid, uid_t uid, bool all_threads);
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struct thread_map *thread_map__new_by_tid_str(const char *tid_str);
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