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

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Date:	Sun, 3 May 2009 17:38:06 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
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 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.
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