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Date: Fri, 30 Dec 2022 09:17:28 +0800 (CST) From: <yang.yang29@....com.cn> To: <akpm@...ux-foundation.org> Cc: <david@...hat.com>, <imbrenda@...ux.ibm.com>, <jiang.xuexin@....com.cn>, <linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>, <ran.xiaokai@....com.cn>, <xu.xin.sc@...il.com>, <xu.xin16@....com.cn>, <yang.yang29@....com.cn> Subject: [PATCH v5 5/6] ksm: add zero_pages_sharing documentation From: xu xin <xu.xin16@....com.cn> When enabling use_zero_pages, pages_sharing cannot represent how much memory saved indeed. zero_pages_sharing + pages_sharing does. add the description of zero_pages_sharing. Cc: Xiaokai Ran <ran.xiaokai@....com.cn> Cc: Yang Yang <yang.yang29@....com.cn> Cc: Jiang Xuexin <jiang.xuexin@....com.cn> Cc: Claudio Imbrenda <imbrenda@...ux.ibm.com> Cc: David Hildenbrand <david@...hat.com> Signed-off-by: xu xin <xu.xin16@....com.cn> --- Documentation/admin-guide/mm/ksm.rst | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/Documentation/admin-guide/mm/ksm.rst b/Documentation/admin-guide/mm/ksm.rst index fb6ba2002a4b..f160f9487a90 100644 --- a/Documentation/admin-guide/mm/ksm.rst +++ b/Documentation/admin-guide/mm/ksm.rst @@ -173,6 +173,13 @@ stable_node_chains the number of KSM pages that hit the ``max_page_sharing`` limit stable_node_dups number of duplicated KSM pages +zero_pages_sharing + how many empty pages are sharing kernel zero page(s) instead of + with each other as it would happen normally. Only effective when + enabling ``use_zero_pages`` knob. + +When enabling ``use_zero_pages``, the sum of ``pages_sharing`` + +``zero_pages_sharing`` represents how much really saved by KSM. A high ratio of ``pages_sharing`` to ``pages_shared`` indicates good sharing, but a high ratio of ``pages_unshared`` to ``pages_sharing`` -- 2.15.2
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