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

[firefly-linux-kernel-4.4.55.git] / mm / slab.c

diff --git a/mm/slab.c b/mm/slab.c
index dee857a8680b9ad43b265184a9990027944784cb..351aa6c587f7c01760d5fe98e35f9db89e585c2e 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);
                }