Hiroshi Shimamoto 7877a0ba5e sched/cputime: Remove extra cost in task_cputime() ...

There is an extra cost in task_cputime() and task_cputime_scaled() when
nohz_full is not activated. When vtime accounting is not enabled, we
don't need to get deltas of utime and stime under vtime seqlock.

This patch removes that cost with adding a shortcut route if vtime
accounting is not enabled.

Use context_tracking_is_enabled() to check if vtime is accounting on
some cpu, in which case only we need to check the tickless cputime delta.

Signed-off-by: Hiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Chris Metcalf <cmetcalf@ezchip.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Luiz Capitulino <lcapitulino@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul E . McKenney <paulmck@linux.vnet.ibm.com>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1447948054-28668-3-git-send-email-fweisbec@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

2015-12-04 10:34:43 +01:00

..

auto_group.c

sched, timer: Convert usages of ACCESS_ONCE() in the scheduler to READ_ONCE()/WRITE_ONCE()

2015-05-08 12:11:32 +02:00

auto_group.h

sched, timer: Convert usages of ACCESS_ONCE() in the scheduler to READ_ONCE()/WRITE_ONCE()

2015-05-08 12:11:32 +02:00

clock.c

kernel/sched/clock.c: add another clock for use with the soft lockup watchdog

2015-02-12 18:54:13 -08:00

completion.c

sched/completion: Serialize completion_done() with complete()

2015-02-18 14:27:40 +01:00

core.c

sched/fair: Make it possible to account fair load avg consistently

2015-12-04 10:34:42 +01:00

cpuacct.c

cgroup: rename cgroup_subsys->base_cftypes to ->legacy_cftypes

2014-07-15 11:05:09 -04:00

cpuacct.h

sched/cpuacct: Initialize root cpuacct earlier

2013-04-10 13:54:20 +02:00

cpudeadline.c

sched/deadline: Unify dl_time_before() usage

2015-09-23 09:51:25 +02:00

cpudeadline.h

sched/deadline: Unify dl_time_before() usage

2015-09-23 09:51:25 +02:00

cpupri.c

Merge commit '3cf2f34' into sched/core, to fix build error

2014-06-12 13:46:37 +02:00

cpupri.h

sched/cpupri: Remove unnecessary definitions in cpupri.h

2014-11-16 10:58:59 +01:00

cputime.c

sched/cputime: Remove extra cost in task_cputime()

2015-12-04 10:34:43 +01:00

deadline.c

sched/core: Add missing lockdep_unpin() annotations

2015-10-23 12:02:10 +02:00

debug.c

sched/fair: Provide runnable_load_avg back to cfs_rq

2015-08-03 12:24:31 +02:00

fair.c

sched/fair: Make it possible to account fair load avg consistently

2015-12-04 10:34:42 +01:00

features.h

sched/fair: Convert arch_scale_cpu_capacity() from weak function to #define

2015-09-13 09:52:55 +02:00

idle_task.c

sched/fair: Remove empty idle enter and exit functions

2015-11-23 09:37:51 +01:00

idle.c

sched, tracing: Stop/start critical timings around the idle=poll idle loop

2015-10-12 09:45:25 +02:00

loadavg.c

sched: Move the loadavg code to a more obvious location

2015-05-08 12:04:12 +02:00

Makefile

sched: Move the loadavg code to a more obvious location

2015-05-08 12:04:12 +02:00

rt.c

sched/rt: Hide the push_irq_work_func() declaration

2015-11-23 09:25:08 +01:00

sched.h

sched/fair: Make it possible to account fair load avg consistently

2015-12-04 10:34:42 +01:00

stats.c

sched: use %*pb[l] to print bitmaps including cpumasks and nodemasks

2015-02-13 21:21:37 -08:00

stats.h

sched/stat: Simplify the sched_info accounting dependency

2015-07-04 10:04:30 +02:00

stop_task.c

sched: Make sched_class::set_cpus_allowed() unconditional

2015-08-12 12:06:09 +02:00

wait.c

sched/wait: Fix signal handling in bit wait helpers

2015-12-04 10:10:15 +01:00