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| author | Arnaldo Carvalho de Melo <acme@redhat.com> | 2017-12-01 17:44:30 +0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2017-12-05 16:24:32 +0300 |
| commit | 8d3cd4c3d3ab5f4f9edd5c593b7743f7fbd3526d (patch) | |
| tree | 9998d115faf80cc0cd0c29e7a6dd3bc31cba7d34 /tools/perf/util/thread_map.c | |
| parent | b984aff7811bbac75b3f05931643d815067cf45c (diff) | |
| download | linux-8d3cd4c3d3ab5f4f9edd5c593b7743f7fbd3526d.tar.xz | |
perf thread_map: Add method to map all threads in the system
Reusing the thread_map__new_by_uid() proc scanning already in place to
return a map with all threads in the system.
Based-on-a-patch-by: Jin Yao <yao.jin@linux.intel.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Kan Liang <kan.liang@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lkml.kernel.org/n/tip-khh28q0wwqbqtrk32bfe07hd@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/thread_map.c')
| -rw-r--r-- | tools/perf/util/thread_map.c | 22 |
1 files changed, 16 insertions, 6 deletions
diff --git a/tools/perf/util/thread_map.c b/tools/perf/util/thread_map.c index be0d5a736dea..2b653853eec2 100644 --- a/tools/perf/util/thread_map.c +++ b/tools/perf/util/thread_map.c @@ -92,7 +92,7 @@ struct thread_map *thread_map__new_by_tid(pid_t tid) return threads; } -struct thread_map *thread_map__new_by_uid(uid_t uid) +static struct thread_map *__thread_map__new_all_cpus(uid_t uid) { DIR *proc; int max_threads = 32, items, i; @@ -113,7 +113,6 @@ struct thread_map *thread_map__new_by_uid(uid_t uid) while ((dirent = readdir(proc)) != NULL) { char *end; bool grow = false; - struct stat st; pid_t pid = strtol(dirent->d_name, &end, 10); if (*end) /* only interested in proper numerical dirents */ @@ -121,11 +120,12 @@ struct thread_map *thread_map__new_by_uid(uid_t uid) snprintf(path, sizeof(path), "/proc/%s", dirent->d_name); - if (stat(path, &st) != 0) - continue; + if (uid != UINT_MAX) { + struct stat st; - if (st.st_uid != uid) - continue; + if (stat(path, &st) != 0 || st.st_uid != uid) + continue; + } snprintf(path, sizeof(path), "/proc/%d/task", pid); items = scandir(path, &namelist, filter, NULL); @@ -178,6 +178,16 @@ out_free_closedir: goto out_closedir; } +struct thread_map *thread_map__new_all_cpus(void) +{ + return __thread_map__new_all_cpus(UINT_MAX); +} + +struct thread_map *thread_map__new_by_uid(uid_t uid) +{ + return __thread_map__new_all_cpus(uid); +} + struct thread_map *thread_map__new(pid_t pid, pid_t tid, uid_t uid) { if (pid != -1) |