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| author | Christoph Lameter <cl@linux.com> | 2016-01-14 15:21:40 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-01-14 16:00:49 -0800 |
| commit | 0eb77e9880321915322d42913c3b53241739c8aa (patch) | |
| tree | 5beff1411a4178b6157b78fcd6ef7302050f2641 /kernel/sched/idle.c | |
| parent | 686739f6af5e8d5687ffebbf1193ff066aada6d9 (diff) | |
| download | linux-0-day-0eb77e9880321915322d42913c3b53241739c8aa.tar.gz linux-0-day-0eb77e9880321915322d42913c3b53241739c8aa.tar.xz | |
vmstat: make vmstat_updater deferrable again and shut down on idle
Currently the vmstat updater is not deferrable as a result of commit
ba4877b9ca51 ("vmstat: do not use deferrable delayed work for
vmstat_update"). This in turn can cause multiple interruptions of the
applications because the vmstat updater may run at
Make vmstate_update deferrable again and provide a function that folds
the differentials when the processor is going to idle mode thus
addressing the issue of the above commit in a clean way.
Note that the shepherd thread will continue scanning the differentials
from another processor and will reenable the vmstat workers if it
detects any changes.
Fixes: ba4877b9ca51 ("vmstat: do not use deferrable delayed work for vmstat_update")
Signed-off-by: Christoph Lameter <cl@linux.com>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/sched/idle.c')
| -rw-r--r-- | kernel/sched/idle.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/sched/idle.c b/kernel/sched/idle.c index 4a2ef5a02fd3f..2489140a7c515 100644 --- a/kernel/sched/idle.c +++ b/kernel/sched/idle.c @@ -219,6 +219,7 @@ static void cpu_idle_loop(void) */ __current_set_polling(); + quiet_vmstat(); tick_nohz_idle_enter(); while (!need_resched()) { |