linux-kernel - Re: [PATCH V4 1/4] mm: set page->pfmemalloc in prep_new

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Message-ID: <20150106214416.GA8391@dhcp22.suse.cz>
Date:	Tue, 6 Jan 2015 22:44:16 +0100
From:	Michal Hocko <mhocko@...e.cz>
To:	Vlastimil Babka <vbabka@...e.cz>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Mel Gorman <mgorman@...e.de>,
	Zhang Yanfei <zhangyanfei@...fujitsu.com>,
	Minchan Kim <minchan@...nel.org>,
	David Rientjes <rientjes@...gle.com>,
	Rik van Riel <riel@...hat.com>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: Re: [PATCH V4 1/4] mm: set page->pfmemalloc in prep_new_page()

On Tue 06-01-15 22:10:55, Vlastimil Babka wrote:
> On 01/06/2015 03:30 PM, Michal Hocko wrote:
[...]
> > diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> > index 1bb65e6f48dd..1682d766cb8e 100644
> > --- a/mm/page_alloc.c
> > +++ b/mm/page_alloc.c
> > @@ -2175,10 +2175,11 @@ zonelist_scan:
> >  		}
> >  
> >  try_this_zone:
> > -		page = buffered_rmqueue(preferred_zone, zone, order,
> > +		do {
> > +			page = buffered_rmqueue(preferred_zone, zone, order,
> >  						gfp_mask, migratetype);
> > -		if (page)
> > -			break;
> > +		} while (page && prep_new_page(page, order, gfp_mask,
> > +					       alloc_flags));
> 
> Hm but here we wouldn't return page on success.

Right.

> I wonder if you overlooked the return, hence your "not breaking out of
> the loop" remark?

This was merely to show the intention. Sorry for not being clear enough.

-- 
Michal Hocko
SUSE Labs
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