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Commit 8d3cd4c3 authored by Arnaldo Carvalho de Melo's avatar Arnaldo Carvalho de Melo
Browse files

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: default avatarJin Yao <yao.jin@linux.intel.com>
Acked-by: default avatarJiri 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: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent b984aff7

tools/perf/util/thread_map.c

+16 −6
Original line number Diff line number Diff line
@@ -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)

			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 @@ struct thread_map *thread_map__new_by_uid(uid_t uid) 
	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)

tools/perf/util/thread_map.h

+1 −0
Original line number Diff line number Diff line
@@ -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);