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

[Mel Gorman <mel@csn.ul.ie>]

On Fri, Nov 13, 2009 at 02:24:13PM +0900, KOSAKI Motohiro 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.
> 
> ditto.
> afaik, this patch have been sent to linus.
> 

And ditto, it's there for testers, particularly when patching against
2.6.31.

> 
> > 
> > [rientjes@google.com: Spotted the problem]
> > Signed-off-by: Mel Gorman <mel@csn.ul.ie>
> > Reviewed-by: Pekka Enberg <penberg@cs.helsinki.fi>
> > Reviewed-by: Rik van Riel <riel@redhat.com>
> > Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
> > ---
> >  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 250d055..2bc2ac6 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))) {
> > -- 
> > 1.6.5
> > 
> 
> 
> 

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

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