[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 <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
kishon · Jun 23, 2005 · 01890a4 · 01890a4
1 parent 8476994
commit 01890a4
Showing 1 changed file with 2 additions and 1 deletion.
diff --git 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)