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Date: Tue, 14 Dec 2010 21:24:15 +0100 From: Peter Zijlstra <a.p.zijlstra@...llo.nl> To: Valdis.Kletnieks@...edu Cc: Wu Fengguang <fengguang.wu@...el.com>, Andrew Morton <akpm@...ux-foundation.org>, Jan Kara <jack@...e.cz>, Dave Chinner <david@...morbit.com>, Christoph Hellwig <hch@....de>, Trond Myklebust <Trond.Myklebust@...app.com>, Theodore Ts'o <tytso@....edu>, Chris Mason <chris.mason@...cle.com>, Mel Gorman <mel@....ul.ie>, Rik van Riel <riel@...hat.com>, KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>, Greg Thelen <gthelen@...gle.com>, Minchan Kim <minchan.kim@...il.com>, linux-mm <linux-mm@...ck.org>, "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org> Subject: Re: [PATCH 16/35] writeback: increase min pause time on concurrent dirtiers On Tue, 2010-12-14 at 15:13 -0500, Valdis.Kletnieks@...edu wrote: > So you're not guaranteed that 10*HZ is 10 seconds. 10*USER_HZ, sure. > But not HZ. You're confused. 10*HZ jiffies is always 10 seconds. Hertz means per-second. We take CONFIG_HZ ticks per second, so waiting HZ jiffies makes us wait 1 second. USER_HZ is archaic and only used to stabilize user-interfaces that for some daft reason depended on HZ. -- 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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