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[PATCH] mempool - only init waitqueue in slow path

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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>
This commit is contained in:
Benjamin LaHaise 2005-06-23 00:10:01 -07:00 • committed by Linus Torvalds
parent 8476994af7
commit 01890a4c12
1 changed files with 2 additions and 1 deletions
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3
mm/mempool.c
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@ -204,7 +204,7 @@ void * mempool_alloc(mempool_t *pool, unsigned int __nocast gfp_mask)
{ {
void *element; void *element;
unsigned long flags; unsigned long flags;
DEFINE_WAIT(wait); wait_queue_t wait;
int gfp_temp; int gfp_temp;
might_sleep_if(gfp_mask & __GFP_WAIT); might_sleep_if(gfp_mask & __GFP_WAIT);
@ -235,6 +235,7 @@ repeat_alloc:
/* Now start performing page reclaim */ /* Now start performing page reclaim */
gfp_temp = gfp_mask; gfp_temp = gfp_mask;
init_wait(&wait);
prepare_to_wait(&pool->wait, &wait, TASK_UNINTERRUPTIBLE); prepare_to_wait(&pool->wait, &wait, TASK_UNINTERRUPTIBLE);
smp_mb(); smp_mb();
if (!pool->curr_nr) if (!pool->curr_nr)