Subject: + mempool-add-unlikely-and-likely-hints.patch added to -mm tree
To: mpatocka@xxxxxxxxxx,mingo@xxxxxxx
From: akpm@xxxxxxxxxxxxxxxxxxxx
Date: Fri, 07 Mar 2014 14:58:35 -0800
The patch titled
Subject: mempool: add unlikely and likely hints
has been added to the -mm tree. Its filename is
mempool-add-unlikely-and-likely-hints.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mempool-add-unlikely-and-likely-hints.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mempool-add-unlikely-and-likely-hints.patch
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------------------------------------------------------
From: Mikulas Patocka <mpatocka@xxxxxxxxxx>
Subject: 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@xxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/mempool.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff -puN mm/mempool.c~mempool-add-unlikely-and-likely-hints mm/mempool.c
--- a/mm/mempool.c~mempool-add-unlikely-and-likely-hints
+++ a/mm/mempool.c
@@ -304,9 +304,9 @@ void mempool_free(void *element, mempool
* 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);
_
Patches currently in -mm which might be from mpatocka@xxxxxxxxxx are
mempool-add-unlikely-and-likely-hints.patch
linux-next.patch
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