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Commit 2cb763614c1c5baef58045af9304265075f22d0a

Authored by Dong Zhu
Committed by Ingo Molnar
1 parent 8a749de5e3
Exists in smarc-imx_3.14.28_1.0.0_ga and in 1 other branch imx_3.14.28_1.0.0_ga

timer stats: Add a 'Collection: active/inactive' line to timer usage statistics 

We can enable/disable timer statistics collection via:

  echo [1|0] > /proc/timers_stats

and it would be nice if apps had the ability to check
what the current collection status is.

This patch adds a 'Collection: active/inactive' line to display the
current timer collection status.

Also bump up the timer stats version to v0.3.

Signed-off-by: Dong Zhu <bluezhudong@gmail.com>
Cc: John Stultz <john.stultz@linaro.org>
Link: http://lkml.kernel.org/r/20131010075618.GH2139@zhudong.nay.redhat.com
[ Improved the changelog and the code. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>

Showing 1 changed file with 4 additions and 4 deletions Side-by-side Diff

kernel/time/timer_stats.c
Diff comments   View file @ 2cb7636
... ... @@ -298,15 +298,15 @@
298 298 period = ktime_to_timespec(time);
299 299 ms = period.tv_nsec / 1000000;
300 300  
301   - seq_puts(m, "Timer Stats Version: v0.2\n");
  301 + seq_puts(m, "Timer Stats Version: v0.3\n");
302 302 seq_printf(m, "Sample period: %ld.%03ld s\n", period.tv_sec, ms);
303 303 if (atomic_read(&overflow_count))
304   - seq_printf(m, "Overflow: %d entries\n",
305   - atomic_read(&overflow_count));
  304 + seq_printf(m, "Overflow: %d entries\n", atomic_read(&overflow_count));
  305 + seq_printf(m, "Collection: %s\n", timer_stats_active ? "active" : "inactive");
306 306  
307 307 for (i = 0; i < nr_entries; i++) {
308 308 entry = entries + i;
309   - if (entry->timer_flag & TIMER_STATS_FLAG_DEFERRABLE) {
  309 + if (entry->timer_flag & TIMER_STATS_FLAG_DEFERRABLE) {
310 310 seq_printf(m, "%4luD, %5d %-16s ",
311 311 entry->count, entry->pid, entry->comm);
312 312 } else {