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Message-ID: <517EA4E0.3020803@redhat.com> Date: Mon, 29 Apr 2013 12:50:40 -0400 From: Rik van Riel <riel@...hat.com> To: Mel Gorman <mgorman@...e.de> CC: 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>, 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 1/3] mm: pagevec: Defer deciding what LRU to add a page to until pagevec drain time On 04/29/2013 12:31 PM, Mel Gorman wrote: > mark_page_accessed cannot activate an inactive page that is located on > an inactive LRU pagevec. Hints from filesystems may be ignored as a > result. In preparation for fixing that problem, this patch removes the > per-LRU pagevecs and leaves just one pagevec. The final LRU the page is > added to is deferred until the pagevec is drained. > > This means that fewer pagevecs are available and potentially there is > greater contention on the LRU lock. However, this only applies in the case > where there is an almost perfect mix of file, anon, active and inactive > pages being added to the LRU. In practice I expect that we are adding > stream of pages of a particular time and that the changes in contention > will barely be measurable. > > Signed-off-by: Mel Gorman <mgorman@...e.de> Acked-by: Rik van Riel <riel@...hat.com> -- All rights reversed -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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