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| author | Mikulas Patocka <mpatocka@redhat.com> | 2014-04-07 15:37:35 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-04-07 16:35:55 -0700 |
| commit | eb9a3c62a0b6064c7f7e5b961ce00c646d21cb78 (patch) | |
| tree | fecb27f0ba700b13c2b05364159c4230589b0099 /mm | |
| parent | da1c67a76f7cf2b3404823d24f9f10fa91aa5dc5 (diff) | |
| download | lwn-eb9a3c62a0b6064c7f7e5b961ce00c646d21cb78.tar.gz lwn-eb9a3c62a0b6064c7f7e5b961ce00c646d21cb78.zip | |
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>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/mempool.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/mm/mempool.c b/mm/mempool.c index 659aa42bad16..905434f18c97 100644 --- a/mm/mempool.c +++ b/mm/mempool.c @@ -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); |