netdev - Re: [PATCH 2/5] page allocator: Do not allow interrupts to use ALLOC

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Date:	Thu, 22 Oct 2009 17:37:52 +0100
From:	Mel Gorman <mel@....ul.ie>
To:	Stephan von Krawczynski <skraw@...net.com>
Cc:	Frans Pop <elendil@...net.nl>, Jiri Kosina <jkosina@...e.cz>,
	Sven Geggus <lists@...hsschwanzdomain.de>,
	Karol Lewandowski <karol.k.lewandowski@...il.com>,
	Tobias Oetiker <tobi@...iker.ch>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	David Miller <davem@...emloft.net>,
	Reinette Chatre <reinette.chatre@...el.com>,
	Kalle Valo <kalle.valo@....fi>,
	David Rientjes <rientjes@...gle.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Mohamed Abbas <mohamed.abbas@...el.com>,
	Jens Axboe <jens.axboe@...cle.com>,
	"John W. Linville" <linville@...driver.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [PATCH 2/5] page allocator: Do not allow interrupts to use
	ALLOC_HARDER

On Thu, Oct 22, 2009 at 06:33:03PM +0200, Stephan von Krawczynski wrote:
> On Thu, 22 Oct 2009 15:22:33 +0100
> Mel Gorman <mel@....ul.ie> wrote:
> 
> > Commit 341ce06f69abfafa31b9468410a13dbd60e2b237 altered watermark logic
> > slightly by allowing rt_tasks that are handling an interrupt to set
> > ALLOC_HARDER. This patch brings the watermark logic more in line with
> > 2.6.30.
> > 
> > [rientjes@...gle.com: Spotted the problem]
> > Signed-off-by: Mel Gorman <mel@....ul.ie>
> > Reviewed-by: Pekka Enberg <penberg@...helsinki.fi>
> > ---
> >  mm/page_alloc.c |    2 +-
> >  1 files changed, 1 insertions(+), 1 deletions(-)
> > 
> > diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> > index dfa4362..7f2aa3e 100644
> > --- a/mm/page_alloc.c
> > +++ b/mm/page_alloc.c
> > @@ -1769,7 +1769,7 @@ gfp_to_alloc_flags(gfp_t gfp_mask)
> >  		 * See also cpuset_zone_allowed() comment in kernel/cpuset.c.
> >  		 */
> >  		alloc_flags &= ~ALLOC_CPUSET;
> > -	} else if (unlikely(rt_task(p)))
> > +	} else if (unlikely(rt_task(p)) && !in_interrupt())
> >  		alloc_flags |= ALLOC_HARDER;
> >  
> >  	if (likely(!(gfp_mask & __GFP_NOMEMALLOC))) {
> > -- 
> > 1.6.3.3
> > 
> 
> Is it correct that this one applies offset -54 lines in 2.6.31.4 ? 
> 

In this case, it's ok. It's just a harmless heads-up that the kernel
looks slightly different than expected. I posted a 2.6.31.4 version of
the two patches that cause real problems.

-- 
Mel Gorman
Part-time Phd Student                          Linux Technology Center
University of Limerick                         IBM Dublin Software Lab
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