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[180.214.232.30]) by smtp.gmail.com with ESMTPSA id t15-20020a63b70f000000b00381510608e9sm22520962pgf.14.2022.03.31.04.44.33 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 31 Mar 2022 04:44:38 -0700 (PDT) Message-ID: Date: Thu, 31 Mar 2022 18:44:31 +0700 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.7.0 Subject: Re: [PATCH v5] mm/vmstat: add events for ksm cow Content-Language: en-US To: cgel.zte@gmail.com, akpm@linux-foundation.org, david@redhat.com, willy@infradead.org Cc: corbet@lwn.net, yang.yang29@zte.com.cn, yang.shi@linux.alibaba.com, dave.hansen@linux.intel.com, saravanand@fb.com, minchan@kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, jhubbard@nvidia.com, xu xin , Ran Xiaokai References: <20220331035616.2390805-1-yang.yang29@zte.com.cn> From: Bagas Sanjaya In-Reply-To: <20220331035616.2390805-1-yang.yang29@zte.com.cn> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Authentication-Results: imf18.hostedemail.com; dkim=pass header.d=gmail.com header.s=20210112 header.b=a6w2jv0j; spf=pass (imf18.hostedemail.com: domain of bagasdotme@gmail.com designates 209.85.210.181 as permitted sender) smtp.mailfrom=bagasdotme@gmail.com; dmarc=pass (policy=none) header.from=gmail.com X-Stat-Signature: 8zd1fsjuuf5ac1bycmmqo3ginauojnbo X-Rspam-User: X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 36B8D1C0011 X-HE-Tag: 1648727080-905911 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: On 31/03/22 10.56, cgel.zte@gmail.com wrote: > +Monitoring KSM events > +===================== > + > +There are some counters in /proc/vmstat that may be used to monitor KSM events. > +KSM might help save memory, it's a tradeoff by may suffering delay on KSM COW > +or on swapping in copy. Those events could help users evaluate whether or how > +to use KSM. For example, if cow_ksm increases too fast, user may decrease the > +range of madvise(, , MADV_MERGEABLE). > + Did you mean "tradeoff between possible delay on KSM COW and swapping in copy"? -- An old man doll... just what I always wanted! - Clara