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perf thread_map: Add method to map all threads in the system

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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>
This commit is contained in:
Arnaldo Carvalho de Melo 2017-12-01 11:44:30 -03:00
parent b984aff781
commit 8d3cd4c3d3
2 changed files with 17 additions and 6 deletions
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22
tools/perf/util/thread_map.c
View file

@ -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)

1
tools/perf/util/thread_map.h
View file

@ -23,6 +23,7 @@ struct thread_map *thread_map__new_dummy(void);
struct thread_map *thread_map__new_by_pid(pid_t pid);
struct thread_map *thread_map__new_by_tid(pid_t tid);
struct thread_map *thread_map__new_by_uid(uid_t uid);
struct thread_map *thread_map__new_all_cpus(void);
struct thread_map *thread_map__new(pid_t pid, pid_t tid, uid_t uid);
struct thread_map *thread_map__new_event(struct thread_map_event *event);