Re: kswapd craziness in 3.7

[Rik van Riel]

On 12/06/2012 03:23 PM, Johannes Weiner wrote:

> From: Johannes Weiner <hannes@xxxxxxxxxxx>
> Subject: [patch] mm: vmscan: fix inappropriate zone congestion clearing
>
> c702418 ("mm: vmscan: do not keep kswapd looping forever due to
> individual uncompactable zones") removed zone watermark checks from
> the compaction code in kswapd but left in the zone congestion
> clearing, which now happens unconditionally on higher order reclaim.
>
> This messes up the reclaim throttling logic for zones with
> dirty/writeback pages, where zones should only lose their congestion
> status when their watermarks have been restored.
>
> Remove the clearing from the zone compaction section entirely.  The
> preliminary zone check and the reclaim loop in kswapd will clear it if
> the zone is considered balanced.
>
> Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx>

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


--
All rights reversed
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/