From: Benjamin LaHaise <bcrl@kvack.org>
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>
---
mm/mempool.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletion(-)
diff -puN mm/mempool.c~mempool-only-init-waitqueue-in-slow-path mm/mempool.c
--- 25/mm/mempool.c~mempool-only-init-waitqueue-in-slow-path 2005-06-18 02:49:08.000000000 -0700
+++ 25-akpm/mm/mempool.c 2005-06-18 02:49:08.000000000 -0700
@@ -202,7 +202,7 @@ void * mempool_alloc(mempool_t *pool, un
{
void *element;
unsigned long flags;
- DEFINE_WAIT(wait);
+ wait_queue_t wait;
int gfp_temp;
might_sleep_if(gfp_mask & __GFP_WAIT);
@@ -236,6 +236,7 @@ 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)
_