[PATCH 07/29] mm: allow mempool to fall back to memalloc reserves
From: Peter Zijlstra <hidden>
Date: 2007-02-21 15:32:27
Also in:
linux-mm, lkml
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 <redacted> --- 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;
--