Eric Lee / smarc-ti-linux-kernel

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Commit eb9a3c62a0b6064c7f7e5b961ce00c646d21cb78

Authored by Mikulas Patocka
Committed by Linus Torvalds
1 parent da1c67a76f
Exists in master and in 13 other branches dlt-processor-sdk-linux-03.00.00.04, processor-sdk-linux-02.00.01, smarc-ti-linux-3.15.y, smarc-ti-lsk-linux-4.1.y, smarct3x-processor-sdk-04.01.00.06, smarct3x-processor-sdk-linux-02.00.01, smarct3x-processor-sdk-linux-03.00.00.04, smarct4x-800-processor-sdk-linux-02.00.01, smarct4x-processor-sdk-04.01.00.06, smarct4x-processor-sdk-linux-02.00.01, smarct4x-processor-sdk-linux-03.00.00.04, ti-linux-3.15.y, ti-lsk-linux-4.1.y

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>

Showing 1 changed file with 2 additions and 2 deletions Side-by-side Diff

... ... @@ -304,9 +304,9 @@
304 304 * ensures that there will be frees which return elements to the
305 305 * pool waking up the waiters.
306 306 */
307   - if (pool->curr_nr < pool->min_nr) {
  307 + if (unlikely(pool->curr_nr < pool->min_nr)) {
308 308 spin_lock_irqsave(&pool->lock, flags);
309   - if (pool->curr_nr < pool->min_nr) {
  309 + if (likely(pool->curr_nr < pool->min_nr)) {
310 310 add_element(pool, element);
311 311 spin_unlock_irqrestore(&pool->lock, flags);
312 312 wake_up(&pool->wait);