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Date: Wed, 24 Nov 2010 21:46:41 +0800 From: Wu Fengguang <fengguang.wu@...el.com> To: Peter Zijlstra <a.p.zijlstra@...llo.nl> Cc: Andrew Morton <akpm@...ux-foundation.org>, Jan Kara <jack@...e.cz>, "Li, Shaohua" <shaohua.li@...el.com>, Christoph Hellwig <hch@....de>, Dave Chinner <david@...morbit.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>, 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 06/13] writeback: bdi write bandwidth estimation On Wed, Nov 24, 2010 at 09:42:09PM +0800, Peter Zijlstra wrote: > On Wed, 2010-11-24 at 21:20 +0800, Wu Fengguang wrote: > > > (jiffies - bdi->write_bandwidth_update_time < elapsed) > > > > this will be true if someone else has _done_ overlapped estimation, > > otherwise it will equal: > > > > jiffies - bdi->write_bandwidth_update_time == elapsed > > > > Sorry the comment needs updating. > > Right, but its racy as hell.. Yeah, for N concurrent dirtiers, plus the background flusher, only one is able to update write_bandwidth[_update_time].. -- 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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