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| author | Michal Hocko <mhocko@suse.com> | 2016-03-15 22:57:01 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-03-16 00:55:16 +0100 |
| commit | 0db2cb8da89d991762ec2aece45e55ceaee34664 (patch) | |
| tree | b8821119e212ee45266cc73ba36a04a84247b6f6 /mm/memcontrol.c | |
| parent | mm/madvise: update comment on sys_madvise() (diff) | |
| download | linux-0db2cb8da89d991762ec2aece45e55ceaee34664.tar.xz linux-0db2cb8da89d991762ec2aece45e55ceaee34664.zip | |
mm, vmscan: make zone_reclaimable_pages more precise
zone_reclaimable_pages() is used in should_reclaim_retry() which uses it
to calculate the target for the watermark check. This means that
precise numbers are important for the correct decision.
zone_reclaimable_pages uses zone_page_state which can contain stale data
with per-cpu diffs not synced yet (the last vmstat_update might have run
1s in the past).
Use zone_page_state_snapshot() in zone_reclaimable_pages() instead.
None of the current callers is in a hot path where getting the precise
value (which involves per-cpu iteration) would cause an unreasonable
overhead.
Signed-off-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Suggested-by: David Rientjes <rientjes@google.com>
Acked-by: David Rientjes <rientjes@google.com>
Acked-by: Hillf Danton <hillf.zj@alibaba-inc.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/memcontrol.c')
0 files changed, 0 insertions, 0 deletions