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Commit 01890a4c authored by Benjamin LaHaise's avatar Benjamin LaHaise Committed by Linus Torvalds
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[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: default avatarBenjamin LaHaise <benjamin.c.lahaise@intel.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 8476994a

mm/mempool.c

+2 −1
Original line number Diff line number Diff line
@@ -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 @@ repeat_alloc: 


	/* 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)