[PATCH] slab: remove drain_array_locked

Remove drain_array_locked and use that opportunity to limit the time the l3
lock is taken further.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 10 insertions, 21 deletions

diff --git a/mm/slab.c b/mm/slab.c
index d73b38e7d7e8..3274144c0d16 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -2123,9 +2123,6 @@ static void check_spinlock_acquired_node(struct kmem_cache *cachep, int node)
 #define check_spinlock_acquired_node(x, y) do { } while(0)
 #endif
 
-static void drain_array_locked(struct kmem_cache *cachep,
-                        struct array_cache *ac, int force, int node);
-
 static void drain_array(struct kmem_cache *cachep, struct kmem_list3 *l3,
                         struct array_cache *ac,
                         int force, int node);
@@ -3522,40 +3519,32 @@ static void enable_cpucache(struct kmem_cache *cachep)
                        cachep->name, -err);
 }
 
-static void drain_array_locked(struct kmem_cache *cachep,
-                                struct array_cache *ac, int force, int node)
+/*
+ * Drain an array if it contains any elements taking the l3 lock only if
+ * necessary.
+ */
+void drain_array(struct kmem_cache *cachep, struct kmem_list3 *l3,
+                         struct array_cache *ac, int force, int node)
 {
         int tofree;
 
-        check_spinlock_acquired_node(cachep, node);
+        if (!ac || !ac->avail)
+                return;
         if (ac->touched && !force) {
                 ac->touched = 0;
         } else if (ac->avail) {
                 tofree = force ? ac->avail : (ac->limit + 4) / 5;
                 if (tofree > ac->avail)
                         tofree = (ac->avail + 1) / 2;
+                spin_lock_irq(&l3->list_lock);
                 free_block(cachep, ac->entry, tofree, node);
+                spin_unlock_irq(&l3->list_lock);
                 ac->avail -= tofree;
                 memmove(ac->entry, &(ac->entry[tofree]),
                         sizeof(void *) * ac->avail);
         }
 }
 
-
-/*
- * Drain an array if it contains any elements taking the l3 lock only if
- * necessary.
- */
-static void drain_array(struct kmem_cache *searchp, struct kmem_list3 *l3,
-                         struct array_cache *ac, int force, int node)
-{
-        if (ac && ac->avail) {
-                spin_lock_irq(&l3->list_lock);
-                drain_array_locked(searchp, ac, force, node);
-                spin_unlock_irq(&l3->list_lock);
-        }
-}
-
 /**
  * cache_reap - Reclaim memory from caches.
  * @unused: unused parameter