linux-kernel - [PATCH] Allocate memory cgroup structures in local nodes

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Message-Id: <1304533058-18228-1-git-send-email-andi@firstfloor.org>
Date:	Wed,  4 May 2011 11:17:38 -0700
From:	Andi Kleen <andi@...stfloor.org>
To:	akpm@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Andi Kleen <ak@...ux.intel.com>, Michal Hocko <mhocko@...e.cz>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Balbir Singh <balbir@...ibm.com>,
	Johannes Weiner <hannes@...xchg.org>
Subject: [PATCH] Allocate memory cgroup structures in local nodes

From: Andi Kleen <ak@...ux.intel.com>

[Andrew: since this is a regression and a very simple fix
could you still consider it for .39? Thanks]

dde79e005a769 added a regression that the memory cgroup data structures
all end up in node 0 because the first attempt at allocating them
would not pass in a node hint. Since the initialization runs on CPU #0
it would all end up node 0. This is a problem on large memory systems,
where node 0 would lose a lot of memory.

Change the alloc_pages_exact to alloc_pages_exact_node. This will
still fall back to other nodes if not enough memory is available.

[RED-PEN: right now it would fall back first before trying
vmalloc_node. Probably not the best strategy ... But I left it like
that for now.]

Reported-by: Doug Nelson
CC: Michal Hocko <mhocko@...e.cz>
Cc: Dave Hansen <dave@...ux.vnet.ibm.com>
Cc: Balbir Singh <balbir@...ibm.com>
Cc: Johannes Weiner <hannes@...xchg.org>
Signed-off-by: Andi Kleen <ak@...ux.intel.com>
---
 mm/page_cgroup.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/mm/page_cgroup.c b/mm/page_cgroup.c
index 9905501..1f4e20f 100644
--- a/mm/page_cgroup.c
+++ b/mm/page_cgroup.c
@@ -134,7 +134,7 @@ static void *__init_refok alloc_page_cgroup(size_t size, int nid)
 {
 	void *addr = NULL;

-	addr = alloc_pages_exact(size, GFP_KERNEL | __GFP_NOWARN);
+	addr = alloc_pages_exact_node(nid, size, GFP_KERNEL | __GFP_NOWARN);
 	if (addr)
 		return addr;

-- 
1.7.4.4

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