This is a note to let you know that I've just added the patch titled
perf sched: Move start_work_mutex and work_done_wait_mutex initialization to perf_sched__replay()
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
perf-sched-move-start_work_mutex-and-work_done_wait_.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 6397299c72fe2c44bb5bbce1eb40bf25d0d89eab
Author: Yang Jihong <yangjihong1@xxxxxxxxxx>
Date: Tue Feb 6 08:32:24 2024 +0000
perf sched: Move start_work_mutex and work_done_wait_mutex initialization to perf_sched__replay()
[ Upstream commit c6907863519cf97ee09653cc8ec338a2328c2b6f ]
The start_work_mutex and work_done_wait_mutex are used only for the
'perf sched replay'. Put their initialization in perf_sched__replay () to
reduce unnecessary actions in other commands.
Simple functional testing:
# perf sched record perf bench sched messaging
# Running 'sched/messaging' benchmark:
# 20 sender and receiver processes per group
# 10 groups == 400 processes run
Total time: 0.197 [sec]
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 14.952 MB perf.data (134165 samples) ]
# perf sched replay
run measurement overhead: 108 nsecs
sleep measurement overhead: 65658 nsecs
the run test took 999991 nsecs
the sleep test took 1079324 nsecs
nr_run_events: 42378
nr_sleep_events: 43102
nr_wakeup_events: 31852
target-less wakeups: 17
multi-target wakeups: 712
task 0 ( swapper: 0), nr_events: 10451
task 1 ( swapper: 1), nr_events: 3
task 2 ( swapper: 2), nr_events: 1
<SNIP>
task 717 ( sched-messaging: 74483), nr_events: 152
task 718 ( sched-messaging: 74484), nr_events: 1944
task 719 ( sched-messaging: 74485), nr_events: 73
task 720 ( sched-messaging: 74486), nr_events: 163
task 721 ( sched-messaging: 74487), nr_events: 942
task 722 ( sched-messaging: 74488), nr_events: 78
task 723 ( sched-messaging: 74489), nr_events: 1090
------------------------------------------------------------
#1 : 1366.507, ravg: 1366.51, cpu: 7682.70 / 7682.70
#2 : 1410.072, ravg: 1370.86, cpu: 7723.88 / 7686.82
#3 : 1396.296, ravg: 1373.41, cpu: 7568.20 / 7674.96
#4 : 1381.019, ravg: 1374.17, cpu: 7531.81 / 7660.64
#5 : 1393.826, ravg: 1376.13, cpu: 7725.25 / 7667.11
#6 : 1401.581, ravg: 1378.68, cpu: 7594.82 / 7659.88
#7 : 1381.337, ravg: 1378.94, cpu: 7371.22 / 7631.01
#8 : 1373.842, ravg: 1378.43, cpu: 7894.92 / 7657.40
#9 : 1364.697, ravg: 1377.06, cpu: 7324.91 / 7624.15
#10 : 1363.613, ravg: 1375.72, cpu: 7209.55 / 7582.69
# echo $?
0
Signed-off-by: Yang Jihong <yangjihong1@xxxxxxxxxx>
Signed-off-by: Namhyung Kim <namhyung@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20240206083228.172607-2-yangjihong1@xxxxxxxxxx
Stable-dep-of: 1a5efc9e13f3 ("libsubcmd: Don't free the usage string")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
index 42185da0f000a..2d36b06d4d877 100644
--- a/tools/perf/builtin-sched.c
+++ b/tools/perf/builtin-sched.c
@@ -3329,15 +3329,20 @@ static int perf_sched__map(struct perf_sched *sched)
static int perf_sched__replay(struct perf_sched *sched)
{
+ int ret;
unsigned long i;
+ mutex_init(&sched->start_work_mutex);
+ mutex_init(&sched->work_done_wait_mutex);
+
calibrate_run_measurement_overhead(sched);
calibrate_sleep_measurement_overhead(sched);
test_calibrations(sched);
- if (perf_sched__read_events(sched))
- return -1;
+ ret = perf_sched__read_events(sched);
+ if (ret)
+ goto out_mutex_destroy;
printf("nr_run_events: %ld\n", sched->nr_run_events);
printf("nr_sleep_events: %ld\n", sched->nr_sleep_events);
@@ -3362,7 +3367,11 @@ static int perf_sched__replay(struct perf_sched *sched)
sched->thread_funcs_exit = true;
destroy_tasks(sched);
- return 0;
+
+out_mutex_destroy:
+ mutex_destroy(&sched->start_work_mutex);
+ mutex_destroy(&sched->work_done_wait_mutex);
+ return ret;
}
static void setup_sorting(struct perf_sched *sched, const struct option *options,
@@ -3600,8 +3609,6 @@ int cmd_sched(int argc, const char **argv)
unsigned int i;
int ret = 0;
- mutex_init(&sched.start_work_mutex);
- mutex_init(&sched.work_done_wait_mutex);
sched.curr_thread = calloc(MAX_CPUS, sizeof(*sched.curr_thread));
if (!sched.curr_thread) {
ret = -ENOMEM;
@@ -3689,8 +3696,6 @@ int cmd_sched(int argc, const char **argv)
free(sched.curr_pid);
free(sched.cpu_last_switched);
free(sched.curr_thread);
- mutex_destroy(&sched.start_work_mutex);
- mutex_destroy(&sched.work_done_wait_mutex);
return ret;
}
