linux-kernel - Re: [PATCH 05/17] writeback: quit throttling when signal pending

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Date:	Mon, 13 Sep 2010 09:55:29 +0800
From:	Wu Fengguang <fengguang.wu@...el.com>
To:	Neil Brown <neilb@...e.de>
Cc:	linux-mm <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Theodore Ts'o <tytso@....edu>,
	Dave Chinner <david@...morbit.com>, Jan Kara <jack@...e.cz>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Mel Gorman <mel@....ul.ie>, Rik van Riel <riel@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Chris Mason <chris.mason@...cle.com>,
	Christoph Hellwig <hch@....de>,
	"Li, Shaohua" <shaohua.li@...el.com>
Subject: Re: [PATCH 05/17] writeback: quit throttling when signal pending

On Mon, Sep 13, 2010 at 04:46:54AM +0800, Neil Brown wrote:
> On Sun, 12 Sep 2010 23:49:50 +0800
> Wu Fengguang <fengguang.wu@...el.com> wrote:
> 
> > This allows quick response to Ctrl-C etc. for impatient users.
> > 
> > Signed-off-by: Wu Fengguang <fengguang.wu@...el.com>
> > ---
> >  mm/page-writeback.c |    3 +++
> >  1 file changed, 3 insertions(+)
> > 
> > --- linux-next.orig/mm/page-writeback.c	2010-09-09 16:01:14.000000000 +0800
> > +++ linux-next/mm/page-writeback.c	2010-09-09 16:02:27.000000000 +0800
> > @@ -553,6 +553,9 @@ static void balance_dirty_pages(struct a
> >  		__set_current_state(TASK_INTERRUPTIBLE);
> >  		io_schedule_timeout(pause);
> >  
> > +		if (signal_pending(current))
> > +			break;
> > +
> 
> Given the patch description,  I think you might want "fatal_signal_pending()"
> here ???

__fatal_signal_pending() tests SIGKILL only, while the one often used
and need more quick responding is SIGINT..

Thanks,
Fengguang
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