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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>
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@ -92,7 +92,7 @@ struct thread_map *thread_map__new_by_tid(pid_t tid)
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return threads;
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}
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struct thread_map *thread_map__new_by_uid(uid_t uid)
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static struct thread_map *__thread_map__new_all_cpus(uid_t uid)
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{
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DIR *proc;
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int max_threads = 32, items, i;
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@ -113,7 +113,6 @@ struct thread_map *thread_map__new_by_uid(uid_t uid)
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while ((dirent = readdir(proc)) != NULL) {
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char *end;
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bool grow = false;
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struct stat st;
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pid_t pid = strtol(dirent->d_name, &end, 10);
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if (*end) /* only interested in proper numerical dirents */
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@ -121,11 +120,12 @@ struct thread_map *thread_map__new_by_uid(uid_t uid)
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snprintf(path, sizeof(path), "/proc/%s", dirent->d_name);
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if (stat(path, &st) != 0)
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continue;
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if (uid != UINT_MAX) {
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struct stat st;
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if (st.st_uid != uid)
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continue;
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if (stat(path, &st) != 0 || st.st_uid != uid)
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continue;
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}
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snprintf(path, sizeof(path), "/proc/%d/task", pid);
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items = scandir(path, &namelist, filter, NULL);
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@ -178,6 +178,16 @@ out_free_closedir:
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goto out_closedir;
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}
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struct thread_map *thread_map__new_all_cpus(void)
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{
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return __thread_map__new_all_cpus(UINT_MAX);
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}
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struct thread_map *thread_map__new_by_uid(uid_t uid)
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{
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return __thread_map__new_all_cpus(uid);
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}
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struct thread_map *thread_map__new(pid_t pid, pid_t tid, uid_t uid)
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{
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if (pid != -1)
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@ -23,6 +23,7 @@ struct thread_map *thread_map__new_dummy(void);
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struct thread_map *thread_map__new_by_pid(pid_t pid);
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struct thread_map *thread_map__new_by_tid(pid_t tid);
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struct thread_map *thread_map__new_by_uid(uid_t uid);
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struct thread_map *thread_map__new_all_cpus(void);
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struct thread_map *thread_map__new(pid_t pid, pid_t tid, uid_t uid);
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struct thread_map *thread_map__new_event(struct thread_map_event *event);
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