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| author | Mel Gorman <mgorman@suse.de> | 2014-08-28 19:35:43 +0100 |
|---|---|---|
| committer | Jiri Slaby <jslaby@suse.cz> | 2014-09-26 11:52:09 +0200 |
| commit | fc915114c8369c660b6876b06519902de3bd10c6 (patch) | |
| tree | 8d61ff1227d419ecac1960baaf47f395e9afc86a | |
| parent | 4a4ede23dd902513b3a17d3e61cef9baf650d33e (diff) | |
| download | lwn-fc915114c8369c660b6876b06519902de3bd10c6.tar.gz lwn-fc915114c8369c660b6876b06519902de3bd10c6.zip | |
mm: vmscan: only update per-cpu thresholds for online CPU
commit bb0b6dffa2ccfbd9747ad0cc87c7459622896e60 upstream.
When kswapd is awake reclaiming, the per-cpu stat thresholds are lowered
to get more accurate counts to avoid breaching watermarks. This
threshold update iterates over all possible CPUs which is unnecessary.
Only online CPUs need to be updated. If a new CPU is onlined,
refresh_zone_stat_thresholds() will set the thresholds correctly.
Signed-off-by: Mel Gorman <mgorman@suse.de>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Mel Gorman <mgorman@suse.de>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
| -rw-r--r-- | mm/vmstat.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/vmstat.c b/mm/vmstat.c index 28245d5eaed8..f7ca04482299 100644 --- a/mm/vmstat.c +++ b/mm/vmstat.c @@ -200,7 +200,7 @@ void set_pgdat_percpu_threshold(pg_data_t *pgdat, continue; threshold = (*calculate_pressure)(zone); - for_each_possible_cpu(cpu) + for_each_online_cpu(cpu) per_cpu_ptr(zone->pageset, cpu)->stat_threshold = threshold; } |