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Message-ID: <20090502213356.2f620d81@riellaptop.surriel.com> Date: Sat, 2 May 2009 21:33:56 -0400 From: Rik van Riel <riel@...hat.com> To: Wu Fengguang <fengguang.wu@...el.com> Cc: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>, Peter Zijlstra <peterz@...radead.org>, Elladan <elladan@...imo.com>, linux-kernel@...r.kernel.org, tytso@....edu, linux-mm@...ck.org Subject: Re: [PATCH] vmscan: evict use-once pages first (v3) On Sun, 3 May 2009 09:15:40 +0800 Wu Fengguang <fengguang.wu@...el.com> wrote: > In the worse scenario, it could waste half the memory that could > otherwise be used for readahead buffer and to prevent thrashing, in a > server serving large datasets that are hardly reused, but still slowly > builds up its active list during the long uptime (think about a slowly > performance downgrade that can be fixed by a crude dropcache action). In the best case, the active list ends up containing all the indirect blocks for the files that are occasionally reused, and the system ends up being able to serve its clients with less disk IO. For systems like ftp.kernel.org, the files that are most popular will end up on the active list, without being kicked out by the files that are less popular. -- 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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