[PATCH] slab: Bypass free lists for __drain_alien_cache()

__drain_alien_cache() currently drains objects by freeing them to the
(remote) freelists of the original node.  However, each node also has a
shared list containing objects to be used on any processor of that node.
We can avoid a number of remote node accesses by copying the pointers to
the free objects directly into the remote shared array.

And while we are at it: Skip alien draining if the alien cache spinlock is
already taken.

Kiran reported that this is a performance benefit.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/mm/slab.c b/mm/slab.c
index dee857a..351aa6c 100644 (file)
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -971,6 +971,13 @@ static void __drain_alien_cache(struct kmem_cache *cachep,
 
        if (ac->avail) {
                spin_lock(&rl3->list_lock);
+               /*
+                * Stuff objects into the remote nodes shared array first.
+                * That way we could avoid the overhead of putting the objects
+                * into the free lists and getting them back later.
+                */
+               transfer_objects(rl3->shared, ac, ac->limit);
+
                free_block(cachep, ac->entry, ac->avail, node);
                ac->avail = 0;
                spin_unlock(&rl3->list_lock);
@@ -986,8 +993,8 @@ static void reap_alien(struct kmem_cache *cachep, struct kmem_list3 *l3)
 
        if (l3->alien) {
                struct array_cache *ac = l3->alien[node];
-               if (ac && ac->avail) {
-                       spin_lock_irq(&ac->lock);
+
+               if (ac && ac->avail && spin_trylock_irq(&ac->lock)) {
                        __drain_alien_cache(cachep, ac, node);
                        spin_unlock_irq(&ac->lock);
                }