Peter Zijlstra 23cfa361f3 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>

2014-11-16 10:04:18 +01:00

..

alarmtimer.c

alarmtimer: Lock k_itimer during timer callback

2014-09-12 13:59:12 -07:00

clockevents.c

clockevents: Prevent shift out of bounds

2014-10-25 10:43:15 +02:00

clocksource.c

clocksource: Make delta calculation a function

2014-07-23 15:01:51 -07:00

hrtimer.c

Merge branch 'for-3.18-consistent-ops' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu

2014-10-15 07:48:18 +02:00

itimer.c

time/timers: Move all time(r) related files into kernel/time

2014-06-23 11:22:35 +02:00

jiffies.c

…

Kconfig

clocksource: Move cycle_last validation to core code

2014-07-23 15:01:51 -07:00

Makefile

kernel: time: Add udelay_test module to validate udelay

2014-07-23 10:16:35 -07:00

ntp_internal.h

timekeeping: Convert timekeeping core to use timespec64s

2014-07-23 10:17:54 -07:00

ntp.c

timekeeping: Provide timespec64 based interfaces

2014-07-23 10:17:55 -07:00

posix-clock.c

…

posix-cpu-timers.c

sched/cputime: Fix cpu_timer_sample_group() double accounting

2014-11-16 10:04:18 +01:00

posix-timers.c

posix-timers: Fix stack info leak in timer_create()

2014-10-25 10:43:15 +02:00

sched_clock.c

sched_clock: Avoid corrupting hrtimer tree during suspend

2014-07-24 12:02:49 +02:00

tick-broadcast-hrtimer.c

…

tick-broadcast.c

time: Replace __get_cpu_var uses

2014-08-26 13:45:44 -04:00

tick-common.c

Merge branch 'for-3.18-consistent-ops' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu

2014-10-15 07:48:18 +02:00

tick-internal.h

nohz: Move nohz full init call to tick init

2014-09-13 18:34:44 +02:00

tick-oneshot.c

time: Replace __get_cpu_var uses

2014-08-26 13:45:44 -04:00

tick-sched.c

Merge branch 'for-3.18-consistent-ops' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu

2014-10-15 07:48:18 +02:00

time.c

jiffies: Fix timeval conversion to jiffies

2014-09-12 13:59:03 -07:00

timeconst.bc

time/timers: Move all time(r) related files into kernel/time

2014-06-23 11:22:35 +02:00

timeconv.c

…

timekeeping_debug.c

timekeeping: Convert timekeeping core to use timespec64s

2014-07-23 10:17:54 -07:00

timekeeping_internal.h

clocksource: Move cycle_last validation to core code

2014-07-23 15:01:51 -07:00

timekeeping.c

timekeeping: Update timekeeper before updating vsyscall and pvclock

2014-09-06 12:58:18 +02:00

timekeeping.h

time: Consolidate the time accessor prototypes

2014-07-23 10:17:54 -07:00

timer_list.c

…

timer_stats.c

…

timer.c

Merge branch 'for-3.18-consistent-ops' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu

2014-10-15 07:48:18 +02:00

udelay_test.c

kernel: time: Add udelay_test module to validate udelay

2014-07-23 10:16:35 -07:00