Messages in this thread | | | Date | Thu, 31 Jul 2014 11:38:35 -0400 | From | Rik van Riel <> | Subject | Re: [PATCH 2/2] memcg, vmscan: Fix forced scan of anonymous pages |
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On 07/31/2014 07:49 AM, Jerome Marchand wrote: > When memory cgoups are enabled, the code that decides to force to > scan anonymous pages in get_scan_count() compares global values > (free, high_watermark) to a value that is restricted to a memory > cgroup (file). It make the code over-eager to force anon scan. > > For instance, it will force anon scan when scanning a memcg that > is mainly populated by anonymous page, even when there is plenty of > file pages to get rid of in others memcgs, even when swappiness == > 0. It breaks user's expectation about swappiness and hurts > performance. > > This patch make sure that forced anon scan only happens when there > not enough file pages for the all zone, not just in one random > memcg. > > Signed-off-by: Jerome Marchand <jmarchan@redhat.com>
That fix is a lot smaller than I thought it would be. Nice.
Reviewed-by: Rik van Riel <riel@redhat.com>
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