Messages in this thread | | | Date | Wed, 3 Aug 2011 13:37:06 +0200 | From | Johannes Weiner <> | Subject | Re: [PATCH 8/8] mm: vmscan: Do not writeback filesystem pages from kswapd |
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On Thu, Jul 21, 2011 at 05:28:50PM +0100, Mel Gorman wrote: > Assuming that flusher threads will always write back dirty pages promptly > then it is always faster for reclaimers to wait for flushers. This patch > prevents kswapd writing back any filesystem pages. > > Signed-off-by: Mel Gorman <mgorman@suse.de>
Relying on the flushers may mean that every dirty page in the system has to be written back before the pages from the zone of interest are clean.
De-facto we have only one mechanism to stay on top of the dirty pages from a per-zone perspective, and that is single-page writeout from reclaim.
While we all agree that this sucks, we can not remove it unless we have a replacement that makes zones reclaimable in a reasonable time frame (or keep them reclaimable in the first place, what per-zone dirty limits attempt to do).
As such, please include
Nacked-by: Johannes Weiner <jweiner@redhat.com>
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