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Date: Sat, 8 Oct 2022 07:07:01 +0000 From: xu.xin.sc@...il.com To: akpm@...ux-foundation.org Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org, xu xin <xu.xin16@....com.cn>, Xiaokai Ran <ran.xiaokai@....com.cn>, Yang Yang <yang.yang29@....com.cn>, Jiang Xuexin <jiang.xuexin@....com.cn>, Claudio Imbrenda <imbrenda@...ux.ibm.com>, David Hildenbrand <david@...hat.com> Subject: [PATCH 5/5] 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 | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/Documentation/admin-guide/mm/ksm.rst b/Documentation/admin-guide/mm/ksm.rst index fb6ba2002a4b..484665aa7418 100644 --- a/Documentation/admin-guide/mm/ksm.rst +++ b/Documentation/admin-guide/mm/ksm.rst @@ -162,7 +162,7 @@ The effectiveness of KSM and MADV_MERGEABLE is shown in ``/sys/kernel/mm/ksm/``: pages_shared how many shared pages are being used pages_sharing - how many more sites are sharing them i.e. how much saved + how many more sites are sharing them pages_unshared how many pages unique but repeatedly checked for merging pages_volatile @@ -173,6 +173,14 @@ 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. + +If ``use_zero_pages`` is 0, only ``pages_sharing`` can represents how +much saved. Otherwise, ``pages_sharing`` + ``zero_pages_sharing`` +represents how much saved actually. A high ratio of ``pages_sharing`` to ``pages_shared`` indicates good sharing, but a high ratio of ``pages_unshared`` to ``pages_sharing`` -- 2.25.1
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