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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2012-05-17 17:15:29 +0200
committerIngo Molnar <mingo@kernel.org>2012-05-30 14:02:16 +0200
commit5aaa0b7a2ed5b12692c9ffb5222182bd558d3146 (patch)
tree0334762e9d0e773acf21e61c682f895c25201c89 /kernel/time
parent9f646389aa7727a2fd8f9ae6337b92af9cfbc264 (diff)
downloadop-kernel-dev-5aaa0b7a2ed5b12692c9ffb5222182bd558d3146.zip
op-kernel-dev-5aaa0b7a2ed5b12692c9ffb5222182bd558d3146.tar.gz
sched/nohz: Fix rq->cpu_load calculations some more
Follow up on commit 556061b00 ("sched/nohz: Fix rq->cpu_load[] calculations") since while that fixed the busy case it regressed the mostly idle case. Add a callback from the nohz exit to also age the rq->cpu_load[] array. This closes the hole where either there was no nohz load balance pass during the nohz, or there was a 'significant' amount of idle time between the last nohz balance and the nohz exit. So we'll update unconditionally from the tick to not insert any accidental 0 load periods while busy, and we try and catch up from nohz idle balance and nohz exit. Both these are still prone to missing a jiffy, but that has always been the case. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: pjt@google.com Cc: Venkatesh Pallipadi <venki@google.com> Link: http://lkml.kernel.org/n/tip-kt0trz0apodbf84ucjfdbr1a@git.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/time')
-rw-r--r--kernel/time/tick-sched.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index 6a3a5b9..0c927cd 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -576,6 +576,7 @@ void tick_nohz_idle_exit(void)
/* Update jiffies first */
select_nohz_load_balancer(0);
tick_do_update_jiffies64(now);
+ update_cpu_load_nohz();
#ifndef CONFIG_VIRT_CPU_ACCOUNTING
/*
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