linux-kernel - [PATCH] slab: document why cache can have no per cpu array on kfree

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Date:	Wed, 25 Jun 2014 18:39:37 +0400
From:	Vladimir Davydov <vdavydov@...allels.com>
To:	<akpm@...ux-foundation.org>
CC:	<iamjoonsoo.kim@....com>, <cl@...ux.com>, <rientjes@...gle.com>,
	<penberg@...nel.org>, <hannes@...xchg.org>, <mhocko@...e.cz>,
	<linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>
Subject: [PATCH] slab: document why cache can have no per cpu array on kfree

Signed-off-by: Vladimir Davydov <vdavydov@...allels.com>
---
 mm/slab.c |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/mm/slab.c b/mm/slab.c
index 6009e44a4d1d..4cb2619277ff 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -3530,6 +3530,10 @@ static inline void __cache_free(struct kmem_cache *cachep, void *objp,
 	kmemcheck_slab_free(cachep, objp, cachep->object_size);
 
 #ifdef CONFIG_MEMCG_KMEM
+	/*
+	 * Per cpu arrays are disabled for dead memcg caches in order not to
+	 * prevent self-destruction.
+	 */
 	if (unlikely(!ac)) {
 		int nodeid = page_to_nid(virt_to_page(objp));
 
-- 
1.7.10.4

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