From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCH 2/2] xfs: kick inode writeback when low on memory
Date: Fri, 15 Apr 2011 04:09:16 -0400
Message-ID: <20110415080915.GA10619@infradead.org>
References: <1302157196-1988-1-git-send-email-david@fromorbit.com>
 <1302157196-1988-3-git-send-email-david@fromorbit.com>
 <1302726822.2023.128.camel@doink>
 <20110414050846.GJ21395@dastard>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Cc: Alex Elder <aelder@sgi.com>, linux-fsdevel@vger.kernel.org,
	xfs@oss.sgi.com
To: Dave Chinner <david@fromorbit.com>
Return-path: <linux-fsdevel-owner@vger.kernel.org>
Received: from bombadil.infradead.org ([18.85.46.34]:34269 "EHLO
	bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1755472Ab1DOIJR (ORCPT
	<rfc822;linux-fsdevel@vger.kernel.org>);
	Fri, 15 Apr 2011 04:09:17 -0400
Content-Disposition: inline
In-Reply-To: <20110414050846.GJ21395@dastard>
Sender: linux-fsdevel-owner@vger.kernel.org
List-ID: <linux-fsdevel.vger.kernel.org>

On Thu, Apr 14, 2011 at 03:08:46PM +1000, Dave Chinner wrote:
> Unfortunately, we simply can't take the s_umount lock in reclaim
> context. So further hackery is going to be required here - I think
> that writeback_inodes_sb_nr_if_idle() need to use trylocks. if the
> s_umount lock is taken in write mode, then it's pretty certain that
> the sb is busy....

http://thread.gmane.org/gmane.linux.file-systems/48373/focus=48628