linux-kernel - [PATCH 4/4] slub: fix cpuset check in get_any

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Message-ID: <a3dcb3264b41f6eeea64241f6959735a1fbf0e96.1411741632.git.vdavydov@parallels.com>
Date:	Fri, 26 Sep 2014 18:50:55 +0400
From:	Vladimir Davydov <vdavydov@...allels.com>
To:	<linux-kernel@...r.kernel.org>
CC:	Li Zefan <lizefan@...wei.com>, Christoph Lameter <cl@...ux.com>,
	Pekka Enberg <penberg@...nel.org>,
	David Rientjes <rientjes@...gle.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Andrew Morton <akpm@...ux-foundation.org>, <linux-mm@...ck.org>
Subject: [PATCH 4/4] slub: fix cpuset check in get_any_partial

If we fail to allocate from the current node's stock, we look for free
objects on other nodes before calling the page allocator (see
get_any_partial). While checking other nodes we respect cpuset
constraints by calling cpuset_zone_allowed. We enforce hardwall check.
As a result, we will fallback to the page allocator even if there are
some pages cached on other nodes, but the current cpuset doesn't have
them set. However, the page allocator uses softwall check for kernel
allocations, so it may allocate from one of the other nodes in this
case.

Therefore we should use softwall cpuset check in get_any_partial to
conform with the cpuset check in the page allocator.

Signed-off-by: Vladimir Davydov <vdavydov@...allels.com>
---
 mm/slub.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/mm/slub.c b/mm/slub.c
index 1bf4e59fea45..70cfdfcb1a75 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -1672,8 +1672,7 @@ static void *get_any_partial(struct kmem_cache *s, gfp_t flags,

 			n = get_node(s, zone_to_nid(zone));

-			if (n && cpuset_zone_allowed(zone,
-						     flags | __GFP_HARDWALL) &&
+			if (n && cpuset_zone_allowed(zone, flags) &&
 					n->nr_partial > s->min_partial) {
 				object = get_partial_node(s, n, c, flags);
 				if (object) {
-- 
1.7.10.4

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