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| author |   Peter Zijlstra <peterz@infradead.org> | 2014-11-12 12:37:37 +0100 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2014-11-16 10:04:18 +0100 |
| commit | 23cfa361f3e54a3e184a5e126bbbdd95f984881a (patch) | |
| tree | 05586994df46de68033653c1180f081ed45ae0be /kernel/time | |
| parent | sched/numa: Avoid selecting oneself as swap target (diff) | |
| download | linux-dev-23cfa361f3e54a3e184a5e126bbbdd95f984881a.tar.xz linux-dev-23cfa361f3e54a3e184a5e126bbbdd95f984881a.zip | |
sched/cputime: Fix cpu_timer_sample_group() double accounting
While looking over the cpu-timer code I found that we appear to add
the delta for the calling task twice, through:
cpu_timer_sample_group()
thread_group_cputimer()
thread_group_cputime()
times->sum_exec_runtime += task_sched_runtime();
*sample = cputime.sum_exec_runtime + task_delta_exec();
Which would make the sample run ahead, making the sleep short.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Stanislaw Gruszka <sgruszka@redhat.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Tejun Heo <tj@kernel.org>
Link: http://lkml.kernel.org/r/20141112113737.GI10476@twins.programming.kicks-ass.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/time')
| -rw-r--r-- | kernel/time/posix-cpu-timers.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/time/posix-cpu-timers.c b/kernel/time/posix-cpu-timers.c index 492b986195d5..a16b67859e2a 100644 --- a/kernel/time/posix-cpu-timers.c +++ b/kernel/time/posix-cpu-timers.c @@ -553,7 +553,7 @@ static int cpu_timer_sample_group(const clockid_t which_clock, *sample = cputime_to_expires(cputime.utime); break; case CPUCLOCK_SCHED: - *sample = cputime.sum_exec_runtime + task_delta_exec(p); + *sample = cputime.sum_exec_runtime; break; } return 0; |