Re: [PATCH 4/6] mm: vmscan: Only update per-cpu thresholds for online CPU

From: Johannes Weiner
Date: Thu Jul 10 2014 - 08:09:39 EST

On Wed, Jul 09, 2014 at 09:13:06AM +0100, Mel Gorman wrote:
> 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@xxxxxxx>

Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx>
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