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Message-ID: <20080608225800.17d2e29b@bree.surriel.com> Date: Sun, 8 Jun 2008 22:58:00 -0400 From: Rik van Riel <riel@...hat.com> To: Andrew Morton <akpm@...ux-foundation.org> Cc: linux-kernel@...r.kernel.org, lee.schermerhorn@...com, kosaki.motohiro@...fujitsu.com, linux-mm@...ck.org, eric.whitney@...com Subject: Re: [PATCH -mm 13/25] Noreclaim LRU Infrastructure On Sun, 8 Jun 2008 16:54:34 -0700 Andrew Morton <akpm@...ux-foundation.org> wrote: > ho hum. Can you remind us what problems this patchset actually > addresses? Preferably in order of seriousness? Here are some other problems that my patch series can easily fix, because file cache and anon/swap backed pages live on separate LRUs: http://feedblog.org/2007/09/29/using-o_direct-on-linux-and-innodb-to-fix-swap-insanity/ http://blogs.smugmug.com/don/2008/05/01/mysql-and-the-linux-swap-problem/ I do not know for sure whether the patch set does fix it yet for everyone, or whether it needs some more tuning first, but it is fairly easily fixable by tweaking the relative pressure on both sets of LRU lists. No tricks of skipping over one type of pages while scanning, or treating the referenced bits differently when the moon is in some particular phase required - one set of lists for each type of pages, and variable pressure between the two. -- 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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