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Subject[PATCH 7/9] 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 | 10 ++++++++++
1 file changed, 10 insertions(+)
Index: linux-2.6-git/mm/mempool.c
===================================================================
--- linux-2.6-git.orig/mm/mempool.c 2007-01-12 08:03:44.000000000 +0100
+++ linux-2.6-git/mm/mempool.c 2007-01-12 10:38:57.000000000 +0100
@@ -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)
{
@@ -229,6 +230,15 @@ 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_mask) & 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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