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X-FangMail-Envelope: 1672020447/4NgLlM1bT9z4xyCV/63A901DF.000/10.5.228.132/[10.5.228.132]/mse-fl1.zte.com.cn/ X-Fangmail-Anti-Spam-Filtered: true X-Fangmail-MID-QID: 63A901DF.000/4NgLlM1bT9z4xyCV X-Rspamd-Queue-Id: 349C940008 X-Stat-Signature: whq3escs3eh3ncha4zxjjijc1zmwbbgb X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1672020449-583171 X-HE-Meta: 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 wu4mJ0f5 4Attc X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: xu xin 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 Cc: Yang Yang Cc: Jiang Xuexin Cc: Claudio Imbrenda Cc: David Hildenbrand Signed-off-by: xu xin --- 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