linux-kernel - Re: [RFC][PATCH 1/6] mm: Introduce __GFP_NO_OOM

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Date:	Mon, 11 May 2009 13:12:57 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
cc:	Wu Fengguang <fengguang.wu@...el.com>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>, Pavel Machek <pavel@....cz>,
	Nigel Cunningham <nigel@...onice.net>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [RFC][PATCH 1/6] mm: Introduce __GFP_NO_OOM_KILL

On Sun, 10 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
> @@ -1619,8 +1619,12 @@ nofail_alloc:
>  			goto got_pg;
>  		}
>  
> -		/* The OOM killer will not help higher order allocs so fail */
> -		if (order > PAGE_ALLOC_COSTLY_ORDER) {
> +		/*
> +		 * The OOM killer will not help higher order allocs so fail.
> +		 * Also fail if the caller doesn't want the OOM killer to run.
> +		 */
> +		if (order > PAGE_ALLOC_COSTLY_ORDER
> +				|| (gfp_mask & __GFP_NO_OOM_KILL)) {
>  			clear_zonelist_oom(zonelist, gfp_mask);
>  			goto nopage;
>  		}
> Index: linux-2.6/include/linux/gfp.h
> ===================================================================
> --- linux-2.6.orig/include/linux/gfp.h
> +++ linux-2.6/include/linux/gfp.h
> @@ -51,8 +51,9 @@ struct vm_area_struct;
>  #define __GFP_THISNODE	((__force gfp_t)0x40000u)/* No fallback, no policies */
>  #define __GFP_RECLAIMABLE ((__force gfp_t)0x80000u) /* Page is reclaimable */
>  #define __GFP_MOVABLE	((__force gfp_t)0x100000u)  /* Page is movable */
> +#define __GFP_NO_OOM_KILL ((__force gfp_t)0x200000u)  /* Don't invoke out_of_memory() */
>  
> -#define __GFP_BITS_SHIFT 21	/* Room for 21 __GFP_FOO bits */
> +#define __GFP_BITS_SHIFT 22	/* Number of __GFP_FOO bits */
>  #define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1))
>  
>  /* This equals 0, but use constants in case they ever change */
> 

Nack, unnecessary in mmotm and my patch series from 
http://lkml.org/lkml/2009/5/10/118.
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