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>
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@ -304,9 +304,9 @@ void mempool_free(void *element, mempool_t *pool)
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* ensures that there will be frees which return elements to the
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* pool waking up the waiters.
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*/
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if (pool->curr_nr < pool->min_nr) {
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if (unlikely(pool->curr_nr < pool->min_nr)) {
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spin_lock_irqsave(&pool->lock, flags);
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if (pool->curr_nr < pool->min_nr) {
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if (likely(pool->curr_nr < pool->min_nr)) {
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add_element(pool, element);
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spin_unlock_irqrestore(&pool->lock, flags);
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wake_up(&pool->wait);
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