From mboxrd@z Thu Jan 1 00:00:00 1970 Message-Id: <20070806103658.869977000@chello.nl> References: <20070806102922.907530000@chello.nl> Date: Mon, 06 Aug 2007 12:29:27 +0200 From: Peter Zijlstra Subject: [PATCH 05/10] mm: allow mempool to fall back to memalloc reserves Content-Disposition: inline; filename=mm-mempool_fixup.patch Sender: owner-linux-mm@kvack.org Return-Path: To: linux-kernel@vger.kernel.org, linux-mm@kvack.org Cc: Peter Zijlstra , David Miller , Andrew Morton , Daniel Phillips , Pekka Enberg , Christoph Lameter , Matt Mackall , Lee Schermerhorn , Steve Dickson List-ID: 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 --- mm/mempool.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) Index: linux-2.6-2/mm/mempool.c =================================================================== --- linux-2.6-2.orig/mm/mempool.c +++ linux-2.6-2/mm/mempool.c @@ -14,6 +14,7 @@ #include #include #include +#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; -- -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org