From: Zhou Guanghui <zhouguanghui1@huawei.com>
To: <linux-kernel@vger.kernel.org>, <linux-mm@kvack.org>
Cc: <akpm@linux-foundation.org>, <mhocko@suse.com>,
<hannes@cmpxchg.org>, <hughd@google.com>,
<kirill.shutemov@linux.intel.com>, <npiggin@gmail.com>,
<ziy@nvidia.com>, <wangkefeng.wang@huawei.com>,
<guohanjun@huawei.com>, <dingtianhong@huawei.com>,
<chenweilong@huawei.com>, <rui.xiang@huawei.com>
Subject: [PATCH v2 2/2] mm/memcg: set memcg when split page
Date: Thu, 4 Mar 2021 07:40:53 +0000 [thread overview]
Message-ID: <20210304074053.65527-3-zhouguanghui1@huawei.com> (raw)
In-Reply-To: <20210304074053.65527-1-zhouguanghui1@huawei.com>
As described in the split_page function comment, for the non-compound
high order page, the sub-pages must be freed individually. If the
memcg of the fisrt page is valid, the tail pages cannot be uncharged
when be freed.
For example, when alloc_pages_exact is used to allocate 1MB continuous
physical memory, 2MB is charged(kmemcg is enabled and __GFP_ACCOUNT is
set). When make_alloc_exact free the unused 1MB and free_pages_exact
free the applied 1MB, actually, only 4KB(one page) is uncharged.
Therefore, the memcg of the tail page needs to be set when split page.
Signed-off-by: Zhou Guanghui <zhouguanghui1@huawei.com>
---
mm/page_alloc.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 3e4b29ee2b1e..3ed783e25c3c 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3310,6 +3310,7 @@ void split_page(struct page *page, unsigned int order)
for (i = 1; i < (1 << order); i++)
set_page_refcounted(page + i);
split_page_owner(page, 1 << order);
+ split_page_memcg(page, 1 << order);
}
EXPORT_SYMBOL_GPL(split_page);
--
2.25.0
next prev parent reply other threads:[~2021-03-04 7:44 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-04 7:40 [PATCH v2 0/2] set memcg when split page Zhou Guanghui
2021-03-04 7:40 ` [PATCH v2 1/2] mm/memcg: rename mem_cgroup_split_huge_fixup to split_page_memcg Zhou Guanghui
2021-03-04 15:50 ` Johannes Weiner
2021-03-04 16:20 ` Zi Yan
2021-03-04 18:54 ` Shakeel Butt
2021-03-05 11:48 ` Michal Hocko
2021-03-08 22:37 ` Singh, Balbir
2021-03-09 8:28 ` Michal Hocko
2021-03-10 21:44 ` Singh, Balbir
2021-03-10 22:00 ` Hugh Dickins
2021-03-10 23:50 ` Singh, Balbir
2021-03-04 7:40 ` Zhou Guanghui [this message]
2021-03-04 15:52 ` [PATCH v2 2/2] mm/memcg: set memcg when split page Johannes Weiner
2021-03-04 16:22 ` Zi Yan
2021-03-04 18:55 ` Shakeel Butt
2021-03-05 11:52 ` Michal Hocko
2021-03-05 23:58 ` Andrew Morton
2021-03-08 8:41 ` Michal Hocko
2021-03-08 20:42 ` Andrew Morton
2021-03-08 20:47 ` Matthew Wilcox
2021-03-09 0:10 ` Andrew Morton
2021-03-08 21:02 ` Matthew Wilcox
2021-03-09 9:02 ` Michal Hocko
2021-03-09 12:32 ` Matthew Wilcox
2021-03-09 13:03 ` Michal Hocko
2021-03-11 8:37 ` Michal Hocko
2021-03-11 15:21 ` Johannes Weiner
2021-03-11 16:23 ` Matthew Wilcox
2021-03-11 16:26 ` Michal Hocko
2021-03-11 20:37 ` Hugh Dickins
2021-03-18 14:05 ` Michal Hocko
2021-03-18 15:02 ` Matthew Wilcox
2021-03-18 15:07 ` Johannes Weiner
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