Commit-ID: 8d3cd4c3d3ab5f4f9edd5c593b7743f7fbd3526d Gitweb: https://git.kernel.org/tip/8d3cd4c3d3ab5f4f9edd5c593b7743f7fbd3526d Author: Arnaldo Carvalho de Melo <a...@redhat.com> AuthorDate: Fri, 1 Dec 2017 11:44:30 -0300 Committer: Arnaldo Carvalho de Melo <a...@redhat.com> CommitDate: Tue, 5 Dec 2017 10:24:32 -0300
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....@linux.intel.com> Acked-by: Jiri Olsa <jo...@kernel.org> Cc: Alexander Shishkin <alexander.shish...@linux.intel.com> Cc: Andi Kleen <a...@linux.intel.com> Cc: Kan Liang <kan.li...@intel.com> Cc: Peter Zijlstra <pet...@infradead.org> Link: https://lkml.kernel.org/n/tip-khh28q0wwqbqtrk32bfe0...@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <a...@redhat.com> --- tools/perf/util/thread_map.c | 22 ++++++++++++++++------ tools/perf/util/thread_map.h | 1 + 2 files changed, 17 insertions(+), 6 deletions(-) diff --git a/tools/perf/util/thread_map.c b/tools/perf/util/thread_map.c index be0d5a7..2b65385 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) diff --git a/tools/perf/util/thread_map.h b/tools/perf/util/thread_map.h index f158039..07a765f 100644 --- a/tools/perf/util/thread_map.h +++ b/tools/perf/util/thread_map.h @@ -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);
