Eric Lee / smarc-ti-linux-kernel

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Commit fc915114c8369c660b6876b06519902de3bd10c6

Authored by Mel Gorman
Committed by Jiri Slaby
1 parent 4a4ede23dd
Exists in ti-linux-3.12.y and in 2 other branches newt-ti-linux-3.12.y, smarc-ti-linux-3.12.y

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>

Showing 1 changed file with 1 additions and 1 deletions Side-by-side Diff

... ... @@ -200,7 +200,7 @@
200 200 continue;
201 201  
202 202 threshold = (*calculate_pressure)(zone);
203   - for_each_possible_cpu(cpu)
  203 + for_each_online_cpu(cpu)
204 204 per_cpu_ptr(zone->pageset, cpu)->stat_threshold
205 205 = threshold;
206 206 }