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    Subject[PATCH 04/33] mm: allow mempool to fall back to memalloc reserves
    Allow the mempool to use the memalloc reserves when all else fails and
    the allocation context would otherwise allow it.

    Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
    ---
    mm/mempool.c | 12 +++++++++++-
    1 file changed, 11 insertions(+), 1 deletion(-)

    Index: linux-2.6/mm/mempool.c
    ===================================================================
    --- linux-2.6.orig/mm/mempool.c
    +++ linux-2.6/mm/mempool.c
    @@ -14,6 +14,7 @@
    #include <linux/mempool.h>
    #include <linux/blkdev.h>
    #include <linux/writeback.h>
    +#include "internal.h"

    static void add_element(mempool_t *pool, void *element)
    {
    @@ -204,7 +205,7 @@ void * mempool_alloc(mempool_t *pool, gf
    void *element;
    unsigned long flags;
    wait_queue_t wait;
    - gfp_t gfp_temp;
    + gfp_t gfp_temp, gfp_orig = gfp_mask;

    might_sleep_if(gfp_mask & __GFP_WAIT);

    @@ -228,6 +229,15 @@ repeat_alloc:
    }
    spin_unlock_irqrestore(&pool->lock, flags);

    + /* if we really had right to the emergency reserves try those */
    + if (gfp_to_alloc_flags(gfp_orig) & ALLOC_NO_WATERMARKS) {
    + if (gfp_temp & __GFP_NOMEMALLOC) {
    + gfp_temp &= ~(__GFP_NOMEMALLOC|__GFP_NOWARN);
    + goto repeat_alloc;
    + } else
    + gfp_temp |= __GFP_NOMEMALLOC|__GFP_NOWARN;
    + }
    +
    /* We must not sleep in the GFP_ATOMIC case */
    if (!(gfp_mask & __GFP_WAIT))
    return NULL;
    --

    -
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