[PATCH 06/16] slab: put forward freeing slab management object

[Joonsoo Kim <iamjoonsoo.kim@lge.com>]

We don't need to free slab management object in rcu context,
because, from now on, we don't manage this slab anymore.
So put forward freeing.

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>

diff --git a/mm/slab.c b/mm/slab.c
index b378f91..607a9b8 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -1820,8 +1820,6 @@ static void kmem_rcu_free(struct rcu_head *head)
 	struct kmem_cache *cachep = slab_rcu->page->slab_cache;
 
 	kmem_freepages(cachep, slab_rcu->page);
-	if (OFF_SLAB(cachep))
-		kmem_cache_free(cachep->slabp_cache, slab_rcu);
 }
 
 #if DEBUG
@@ -2047,11 +2045,16 @@ static void slab_destroy(struct kmem_cache *cachep, struct slab *slabp)
 		slab_rcu = (struct slab_rcu *)slabp;
 		slab_rcu->page = page;
 		call_rcu(&slab_rcu->head, kmem_rcu_free);
-	} else {
+
+	} else
 		kmem_freepages(cachep, page);
-		if (OFF_SLAB(cachep))
-			kmem_cache_free(cachep->slabp_cache, slabp);
-	}
+
+	/*
+	 * From now on, we don't use slab management
+	 * although actual page will be freed in rcu context.
+	 */
+	if (OFF_SLAB(cachep))
+		kmem_cache_free(cachep->slabp_cache, slabp);
 }
 
 /**
-- 
1.7.9.5

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