diff options
| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2012-05-17 17:15:29 +0200 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2012-08-02 14:37:38 +0100 |
| commit | c812fe636b6e1e3b3b409b316157f56054252e25 (patch) | |
| tree | ef06d788954bff0a51fb816c600e8364fe938878 /kernel/time | |
| parent | 1217fd87cfd53eab752837f19386e0a5594719d9 (diff) | |
sched/nohz: Fix rq->cpu_load calculations some more
commit 5aaa0b7a2ed5b12692c9ffb5222182bd558d3146 upstream.
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>
[bwh: Backported to 3.2: adjust filenames and context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'kernel/time')
| -rw-r--r-- | kernel/time/tick-sched.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c index 9955ebd7ab7..793548cb5a9 100644 --- a/kernel/time/tick-sched.c +++ b/kernel/time/tick-sched.c @@ -549,6 +549,7 @@ void tick_nohz_restart_sched_tick(void) /* Update jiffies first */ select_nohz_load_balancer(0); tick_do_update_jiffies64(now); + update_cpu_load_nohz(); #ifndef CONFIG_VIRT_CPU_ACCOUNTING /* |