linux-kernel - [RFC 1/2] mm: Uncharge poisoned pages

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Message-Id: <1492680362-24941-2-git-send-email-ldufour@linux.vnet.ibm.com>
Date:   Thu, 20 Apr 2017 11:26:01 +0200
From:   Laurent Dufour <ldufour@...ux.vnet.ibm.com>
To:     Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        akpm@...ux-foundation.org
Subject: [RFC 1/2] mm: Uncharge poisoned pages

When page are poisoned, they should be uncharged from the root memory
cgroup.

Signed-off-by: Laurent Dufour <ldufour@...ux.vnet.ibm.com>
---
 mm/memory-failure.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 27f7210e7fab..00bd39d3d4cb 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -530,6 +530,7 @@ static const char * const action_page_types[] = {
 static int delete_from_lru_cache(struct page *p)
 {
 	if (!isolate_lru_page(p)) {
+		memcg_kmem_uncharge(p, 0);
 		/*
 		 * Clear sensible page flags, so that the buddy system won't
 		 * complain when the page is unpoison-and-freed.
-- 
2.7.4