Messages in this thread Patch in this message | | | Date | Mon, 14 May 2007 15:19:09 +0200 | From | Peter Zijlstra <> | Subject | [PATCH 5/5] mm: allow mempool to fall back to memalloc reserves |
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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-git/mm/mempool.c =================================================================== --- linux-2.6-git.orig/mm/mempool.c +++ linux-2.6-git/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) { @@ -205,7 +206,7 @@ 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); @@ -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_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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