Re: [PATCH] mm,vmscan: only loop back if compaction would fail inall zones

[Rik van Riel]

On 11/25/2012 11:10 PM, Johannes Weiner wrote:

> From: Johannes Weiner <hannes@xxxxxxxxxxx>
> Subject: [patch] mm: vmscan: fix endless loop in kswapd balancing
>
> Kswapd does not in all places have the same criteria for when it
> considers a zone balanced.  This leads to zones being not reclaimed
> because they are considered just fine and the compaction checks to
> loop over the zonelist again because they are considered unbalanced,
> causing kswapd to run forever.
>
> Add a function, zone_balanced(), that checks the watermark and if
> compaction has enough free memory to do its job.  Then use it
> uniformly for when kswapd needs to check if a zone is balanced.
>
> Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx>

Reviewed-by: Rik van Riel <riel@xxxxxxxxxx>


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