Messages in this thread | | | Date | Wed, 3 Aug 2011 14:58:39 +0100 | From | Mel Gorman <> | Subject | Re: [PATCH 8/8] mm: vmscan: Do not writeback filesystem pages from kswapd |
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On Wed, Aug 03, 2011 at 01:37:06PM +0200, Johannes Weiner wrote: > 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. >
Yes.
> 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. >
Yes.
> 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>
I've already dropped the patch. If I could, I would have signed this at the time as
Signed-off-but-naking-it-anyway: Mel Gorman <mgorman@suse.de
-- Mel Gorman SUSE Labs
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