From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christoph Hellwig Subject: Re: [PATCH 17/18] writeback: fix dirtied pages accounting on redirty Date: Wed, 7 Sep 2011 18:46:19 +0200 Message-ID: <20110907164619.GA10593@lst.de> References: <20110904015305.367445271@intel.com> <20110904020916.841463184@intel.com> <1315325936.14232.22.camel@twins> <20110907002222.GF31945@quack.suse.cz> <20110907065635.GA12619@lst.de> <1315383587.11101.18.camel@twins> <20110907164216.GA7725@quack.suse.cz> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Peter Zijlstra , Christoph Hellwig , Wu Fengguang , linux-fsdevel@vger.kernel.org, Andrew Morton , Dave Chinner , Greg Thelen , Minchan Kim , Vivek Goyal , Andrea Righi , linux-mm , LKML To: Jan Kara Return-path: Content-Disposition: inline In-Reply-To: <20110907164216.GA7725@quack.suse.cz> Sender: owner-linux-mm@kvack.org List-Id: linux-fsdevel.vger.kernel.org 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, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org