From 01890a4c120f68366441bf5e193d1b9dd543d4d0 Mon Sep 17 00:00:00 2001
From: Benjamin LaHaise <bcrl@kvack.org>
Date: Thu, 23 Jun 2005 00:10:01 -0700
Subject: [PATCH] [PATCH] mempool - only init waitqueue in slow path
Here's a small patch to improve the performance of mempool_alloc by only
initializing the wait queue when we're about to wait.
Signed-off-by: Benjamin LaHaise <benjamin.c.lahaise@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---
mm/mempool.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/mm/mempool.c b/mm/mempool.c
index 920c8c3ab1b8f..9a72f7d918fa2 100644
--- a/mm/mempool.c
+++ b/mm/mempool.c
@@ -204,7 +204,7 @@ void * mempool_alloc(mempool_t *pool, unsigned int __nocast gfp_mask)
{
void *element;
unsigned long flags;
- DEFINE_WAIT(wait);
+ wait_queue_t wait;
int gfp_temp;
might_sleep_if(gfp_mask & __GFP_WAIT);
@@ -235,6 +235,7 @@ void * mempool_alloc(mempool_t *pool, unsigned int __nocast gfp_mask)
/* Now start performing page reclaim */
gfp_temp = gfp_mask;
+ init_wait(&wait);
prepare_to_wait(&pool->wait, &wait, TASK_UNINTERRUPTIBLE);
smp_mb();
if (!pool->curr_nr)
--
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