diff options
| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2012-05-17 17:15:29 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-02-20 10:45:32 -0800 |
| commit | f5a4c4b79e57f875b6788f6f8352ca246bfd8450 (patch) | |
| tree | 936b2200d4581b36faa0c94fab560013486885be /include | |
| parent | e2d51f27e382be7b70a755f3ea2fbbeacdb50834 (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>
Cc: Li Zefan <lizefan@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/sched.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h index 1c2470de8052..8cd5cb80223c 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -144,6 +144,7 @@ extern unsigned long this_cpu_load(void); extern void calc_global_load(unsigned long ticks); +extern void update_cpu_load_nohz(void); extern unsigned long get_parent_ip(unsigned long addr); |