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Date: Wed, 1 May 2013 09:31:39 +0100 From: Mel Gorman <mgorman@...e.de> To: Ric Mason <ric.masonn@...il.com> Cc: Sam Ben <sam.bennn@...il.com>, Alexey Lyahkov <alexey.lyashkov@...il.com>, Andrew Perepechko <anserper@...ru>, Robin Dong <sanbai@...bao.com>, Theodore Tso <tytso@....edu>, Andrew Morton <akpm@...ux-foundation.org>, Hugh Dickins <hughd@...gle.com>, Rik van Riel <riel@...hat.com>, Johannes Weiner <hannes@...xchg.org>, Bernd Schubert <bernd.schubert@...tmail.fm>, David Howells <dhowells@...hat.com>, Trond Myklebust <Trond.Myklebust@...app.com>, Linux-fsdevel <linux-fsdevel@...r.kernel.org>, Linux-ext4 <linux-ext4@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>, Linux-mm <linux-mm@...ck.org> Subject: Re: [PATCH 2/3] mm: Ensure that mark_page_accessed moves pages to the active list On Wed, May 01, 2013 at 04:14:16PM +0800, Ric Mason wrote: > On 05/01/2013 04:06 PM, Mel Gorman wrote: > >On Wed, May 01, 2013 at 01:41:34PM +0800, Sam Ben wrote: > >>Hi Mel, > >>On 04/30/2013 12:31 AM, Mel Gorman wrote: > >>>If a page is on a pagevec then it is !PageLRU and mark_page_accessed() > >>>may fail to move a page to the active list as expected. Now that the > >>>LRU is selected at LRU drain time, mark pages PageActive if they are > >>>on a pagevec so it gets moved to the correct list at LRU drain time. > >>>Using a debugging patch it was found that for a simple git checkout > >>>based workload that pages were never added to the active file list in > >>Could you show us the details of your workload? > >> > >The workload is git checkouts of a fixed number of commits for the > > Is there script which you used? > mmtests with config-global-dhp__io-gitcheckout-randread-starvation . Parallel randread was to see if the random file read would push the metadata blocks out or not. I expected it would not be enough to trigger the reported problem but it would be enough to determine if file pages were getting added to the active lists or not. > >kernel git tree. It starts with a warm-up run that is not timed and then > >records the time for a number of iterations. > > How to record the time for a number of iterations? Is the iteration > here means lru scan? > /usr/bin/time -- Mel Gorman SUSE Labs -- 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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