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authorFrederic Weisbecker <fweisbec@gmail.com>2015-11-19 18:47:33 +0300
committerIngo Molnar <mingo@kernel.org>2015-12-04 12:34:45 +0300
commite592539466380279a9e6e6fdfe4545aa54f22593 (patch)
treede661ef2867d8a78877534cde15fcbacc7262586 /kernel/sched
parent55dbdcfa05533f44c9416070b8a9f6432b22314a (diff)
downloadlinux-e592539466380279a9e6e6fdfe4545aa54f22593.tar.xz
sched/cputime: Introduce vtime accounting check for readers
Readers need to know if vtime runs at all on some CPU somewhere, this is a fast-path check to determine if we need to check further the need to add up any tickless cputime delta. This fast path check uses context tracking state because vtime is tied to context tracking as of now. This check appears to be confusing though so lets use a vtime function that deals with context tracking details in vtime implementation instead. 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: Hiroshi Shimamoto <h-shimamoto@ct.jp.nec.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/1447948054-28668-7-git-send-email-fweisbec@gmail.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/sched')
-rw-r--r--kernel/sched/cputime.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/kernel/sched/cputime.c b/kernel/sched/cputime.c
index 572721756359..9989c3f61723 100644
--- a/kernel/sched/cputime.c
+++ b/kernel/sched/cputime.c
@@ -788,7 +788,7 @@ cputime_t task_gtime(struct task_struct *t)
unsigned int seq;
cputime_t gtime;
- if (!context_tracking_is_enabled())
+ if (!vtime_accounting_enabled())
return t->gtime;
do {
@@ -853,7 +853,7 @@ void task_cputime(struct task_struct *t, cputime_t *utime, cputime_t *stime)
{
cputime_t udelta, sdelta;
- if (!context_tracking_is_enabled()) {
+ if (!vtime_accounting_enabled()) {
if (utime)
*utime = t->utime;
if (stime)
@@ -874,7 +874,7 @@ void task_cputime_scaled(struct task_struct *t,
{
cputime_t udelta, sdelta;
- if (!context_tracking_is_enabled()) {
+ if (!vtime_accounting_enabled()) {
if (utimescaled)
*utimescaled = t->utimescaled;
if (stimescaled)