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Message-ID: <50C100D2.4010103@redhat.com> Date: Thu, 06 Dec 2012 15:32:18 -0500 From: Rik van Riel <riel@...hat.com> To: Johannes Weiner <hannes@...xchg.org> CC: Linus Torvalds <torvalds@...ux-foundation.org>, Bruno Wolff III <bruno@...ff.to>, Thorsten Leemhuis <fedora@...mhuis.info>, Mel Gorman <mgorman@...e.de>, Andrew Morton <akpm@...ux-foundation.org>, George Spelvin <linux@...izon.com>, Johannes Hirte <johannes.hirte@....tu-ilmenau.de>, Tomas Racek <tracek@...hat.com>, Jan Kara <jack@...e.cz>, Dave Hansen <dave@...ux.vnet.ibm.com>, Josh Boyer <jwboyer@...il.com>, Valdis Kletnieks <Valdis.Kletnieks@...edu>, Jiri Slaby <jslaby@...e.cz>, Zdenek Kabelac <zkabelac@...hat.com>, linux-mm <linux-mm@...ck.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, John Ellson <john.ellson@...cast.net> Subject: Re: kswapd craziness in 3.7 On 12/06/2012 03:23 PM, Johannes Weiner wrote: > From: Johannes Weiner <hannes@...xchg.org> > 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@...xchg.org> Reviewed-by: Rik van Riel <riel@...hat.com> -- All rights reversed -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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