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Date: Wed, 7 Sep 2011 18:46:19 +0200 From: Christoph Hellwig <hch@....de> To: Jan Kara <jack@...e.cz> Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>, Christoph Hellwig <hch@....de>, Wu Fengguang <fengguang.wu@...el.com>, linux-fsdevel@...r.kernel.org, Andrew Morton <akpm@...ux-foundation.org>, Dave Chinner <david@...morbit.com>, Greg Thelen <gthelen@...gle.com>, Minchan Kim <minchan.kim@...il.com>, Vivek Goyal <vgoyal@...hat.com>, Andrea Righi <arighi@...eler.com>, linux-mm <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org> Subject: Re: [PATCH 17/18] writeback: fix dirtied pages accounting on redirty On Wed, Sep 07, 2011 at 06:42:16PM +0200, Jan Kara wrote: > Well, it depends on what you call common - usually, ->writepage is called > from kswapd which shouldn't be common compared to writeback from a flusher > thread. But now I've realized that JBD2 also calls ->writepage to fulfill > data=ordered mode guarantees and that's what causes most of redirtying of > pages on ext4. That's going away eventually but it will take some time. So > for now writeback has to handle redirtying... Under the "right" loads it may also happen for xfs because we can't take lock non-blockingly in the fluser thread for example. -- 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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