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    Subject[PATCH 13/32] mm: __GFP_MEMALLOC
    __GFP_MEMALLOC will allow the allocation to disregard the watermarks, 
    much like PF_MEMALLOC.

    It allows one to pass along the memalloc state in object related allocation
    flags as opposed to task related flags, such as sk->sk_allocation.

    Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
    ---
    include/linux/gfp.h | 3 ++-
    mm/page_alloc.c | 4 +++-
    2 files changed, 5 insertions(+), 2 deletions(-)

    Index: linux-2.6/include/linux/gfp.h
    ===================================================================
    --- linux-2.6.orig/include/linux/gfp.h
    +++ linux-2.6/include/linux/gfp.h
    @@ -43,6 +43,7 @@ struct vm_area_struct;
    #define __GFP_REPEAT ((__force gfp_t)0x400u) /* See above */
    #define __GFP_NOFAIL ((__force gfp_t)0x800u) /* See above */
    #define __GFP_NORETRY ((__force gfp_t)0x1000u)/* See above */
    +#define __GFP_MEMALLOC ((__force gfp_t)0x2000u)/* Use emergency reserves */
    #define __GFP_COMP ((__force gfp_t)0x4000u)/* Add compound page metadata */
    #define __GFP_ZERO ((__force gfp_t)0x8000u)/* Return zeroed page on success */
    #define __GFP_NOMEMALLOC ((__force gfp_t)0x10000u) /* Don't use emergency reserves */
    @@ -88,7 +89,7 @@ struct vm_area_struct;
    /* Control page allocator reclaim behavior */
    #define GFP_RECLAIM_MASK (__GFP_WAIT|__GFP_HIGH|__GFP_IO|__GFP_FS|\
    __GFP_NOWARN|__GFP_REPEAT|__GFP_NOFAIL|\
    - __GFP_NORETRY|__GFP_NOMEMALLOC)
    + __GFP_NORETRY|__GFP_MEMALLOC|__GFP_NOMEMALLOC)

    /* Control allocation constraints */
    #define GFP_CONSTRAINT_MASK (__GFP_HARDWALL|__GFP_THISNODE)
    Index: linux-2.6/mm/page_alloc.c
    ===================================================================
    --- linux-2.6.orig/mm/page_alloc.c
    +++ linux-2.6/mm/page_alloc.c
    @@ -1452,7 +1452,9 @@ int gfp_to_alloc_flags(gfp_t gfp_mask)
    alloc_flags |= ALLOC_HARDER;

    if (likely(!(gfp_mask & __GFP_NOMEMALLOC))) {
    - if (!in_irq() && (p->flags & PF_MEMALLOC))
    + if (gfp_mask & __GFP_MEMALLOC)
    + alloc_flags |= ALLOC_NO_WATERMARKS;
    + else if (!in_irq() && (p->flags & PF_MEMALLOC))
    alloc_flags |= ALLOC_NO_WATERMARKS;
    else if (!in_interrupt() &&
    unlikely(test_thread_flag(TIF_MEMDIE)))
    --



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