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SubjectRe: [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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