linux-kernel - Re: [PATCH 1/5] mm: Add __GFP_NO_OOM

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Message-Id: <200905041702.23291.rjw@sisk.pl>
Date:	Mon, 4 May 2009 17:02:22 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Wu Fengguang <fengguang.wu@...el.com>,
	linux-pm@...ts.linux-foundation.org,
	Andrew Morton <akpm@...ux-foundation.org>, pavel@....cz,
	torvalds@...ux-foundation.org, jens.axboe@...cle.com,
	alan-jenkins@...fmail.co.uk, linux-kernel@...r.kernel.org,
	kernel-testers@...r.kernel.org
Subject: Re: [PATCH 1/5] mm: Add __GFP_NO_OOM_KILL flag

On Monday 04 May 2009, David Rientjes wrote:
> On Mon, 4 May 2009, Rafael J. Wysocki wrote:
> 
> > Index: linux-2.6/mm/page_alloc.c
> > ===================================================================
> > --- linux-2.6.orig/mm/page_alloc.c
> > +++ linux-2.6/mm/page_alloc.c
> > @@ -1620,7 +1620,8 @@ nofail_alloc:
> >  		}
> >  
> >  		/* The OOM killer will not help higher order allocs so fail */
> > -		if (order > PAGE_ALLOC_COSTLY_ORDER) {
> > +		if (order > PAGE_ALLOC_COSTLY_ORDER ||
> > +				(gfp_mask & __GFP_NO_OOM_KILL)) {
> >  			clear_zonelist_oom(zonelist, gfp_mask);
> >  			goto nopage;
> >  		}
> 
> This is inconsistent because __GFP_NO_OOM_KILL now implies __GFP_NORETRY 
> (the "goto nopage" above), but only for allocations with __GFP_FS set and 
> __GFP_NORETRY clear.

Well, what would you suggest?

Rafael
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