linux-kernel - Re: [PATCH] fix count_vm_event preempt in memory compaction direct reclaim

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Date:	Wed, 5 May 2010 13:51:56 +0100
From:	Mel Gorman <mel@....ul.ie>
To:	Andrea Arcangeli <aarcange@...hat.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Adam Litke <agl@...ibm.com>, Avi Kivity <avi@...hat.com>,
	David Rientjes <rientjes@...gle.com>,
	Minchan Kim <minchan.kim@...il.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Rik van Riel <riel@...hat.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH] fix count_vm_event preempt in memory compaction direct
	reclaim

On Wed, May 05, 2010 at 02:19:08PM +0200, Andrea Arcangeli wrote:
> On Tue, Apr 20, 2010 at 10:01:14PM +0100, Mel Gorman wrote:
> > +		if (page) {
> > +			__count_vm_event(COMPACTSUCCESS);
> > +			return page;
> 
> ==
> From: Andrea Arcangeli <aarcange@...hat.com>
> 
> Preempt is enabled so it must use count_vm_event.
> 
> Signed-off-by: Andrea Arcangeli <aarcange@...hat.com>

Reviewed-by: Mel Gorman <mel@....ul.ie>

Andrew, this is a fix to the patch
mmcompaction-direct-compact-when-a-high-order-allocation-fails.patch

Thanks Andrea, well spotted.

> ---
> 
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -1768,7 +1768,7 @@ __alloc_pages_direct_compact(gfp_t gfp_m
>  				alloc_flags, preferred_zone,
>  				migratetype);
>  		if (page) {
> -			__count_vm_event(COMPACTSUCCESS);
> +			count_vm_event(COMPACTSUCCESS);
>  			return page;
>  		}
>  
> 

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