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mempool: add unlikely and likely hints 

Add unlikely and likely hints to the function mempool_free.  It lays out
the code in such a way that the common path is executed straighforward and
saves a cache line.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mikulas Patocka 2014-04-07 15:37:35 -07:00 committed by Linus Torvalds
parent da1c67a76f
commit eb9a3c62a0
1 changed files with 2 additions and 2 deletions
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4
mm/mempool.c
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@ -304,9 +304,9 @@ void mempool_free(void *element, mempool_t *pool)
* ensures that there will be frees which return elements to the
* pool waking up the waiters.
*/
if (pool->curr_nr < pool->min_nr) {
if (unlikely(pool->curr_nr < pool->min_nr)) {
spin_lock_irqsave(&pool->lock, flags);
if (pool->curr_nr < pool->min_nr) {
if (likely(pool->curr_nr < pool->min_nr)) {
add_element(pool, element);
spin_unlock_irqrestore(&pool->lock, flags);
wake_up(&pool->wait);