linux-kernel - Re: [PATCH 3/5] writeback: stop background/kupdate works from livelocking other works

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Message-ID: <20101110162655.GA4999@quack.suse.cz>
Date:	Wed, 10 Nov 2010 17:26:55 +0100
From:	Jan Kara <jack@...e.cz>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, Jan Kara <jack@...e.cz>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Christoph Hellwig <hch@....de>,
	Jan Engelhardt <jengelh@...ozas.de>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/5] writeback: stop background/kupdate works from
 livelocking other works

On Wed 10-11-10 11:55:16, Wu Fengguang wrote:
> Jan, the below comment is also updated, please double check.
  Thanks! The comment looks OK.

> >  		/*
> > +		 * Background writeout and kupdate-style writeback may
> > +		 * run forever. Stop them if there is other work to do
> > +		 * so that e.g. sync can proceed. They'll be restarted
> > +		 * after the other works are all done.
> > +		 */
> > +		if ((work->for_background || work->for_kupdate) &&
> > +		    !list_empty(&wb->bdi->work_list))
> > +			break;
> > +
> > +		/*
> >  		 * For background writeout, stop when we are below the
> >  		 * background dirty threshold
> >  		 */

								Honza
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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