mm/slab: drain the free slab as much as possible

slabs_tofree() implies freeing all free slab.  We can do it with just
providing INT_MAX.

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Acked-by: Christoph Lameter <cl@linux.com>
Cc: Jesper Dangaard Brouer <brouer@redhat.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/slab.c b/mm/slab.c
index f36d3493f49f2a50b8e1315fe2a9475e5ef237c7..a998d35599a370a84f32c5b738b6b68d9f20f147 100644 (file)
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -895,12 +895,6 @@ static int init_cache_node_node(int node)
        return 0;
 }
 
-static inline int slabs_tofree(struct kmem_cache *cachep,
-                                               struct kmem_cache_node *n)
-{
-       return (n->free_objects + cachep->num - 1) / cachep->num;
-}
-
 static void cpuup_canceled(long cpu)
 {
        struct kmem_cache *cachep;
@@ -965,7 +959,7 @@ free_slab:
                n = get_node(cachep, node);
                if (!n)
                        continue;
-               drain_freelist(cachep, n, slabs_tofree(cachep, n));
+               drain_freelist(cachep, n, INT_MAX);
        }
 }
 
@@ -1117,7 +1111,7 @@ static int __meminit drain_cache_node_node(int node)
                if (!n)
                        continue;
 
-               drain_freelist(cachep, n, slabs_tofree(cachep, n));
+               drain_freelist(cachep, n, INT_MAX);
 
                if (!list_empty(&n->slabs_full) ||
                    !list_empty(&n->slabs_partial)) {
@@ -2311,7 +2305,7 @@ int __kmem_cache_shrink(struct kmem_cache *cachep, bool deactivate)
 
        check_irq_on();
        for_each_kmem_cache_node(cachep, node, n) {
-               drain_freelist(cachep, n, slabs_tofree(cachep, n));
+               drain_freelist(cachep, n, INT_MAX);
 
                ret += !list_empty(&n->slabs_full) ||
                        !list_empty(&n->slabs_partial);