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Fri, 13 Aug 2021 05:36:02 -0700 (PDT) Received: from localhost ([2a01:4b00:8432:8a00:fa59:71ff:fe7e:8d21]) by smtp.gmail.com with ESMTPSA id q5sm1432727wrx.33.2021.08.13.05.36.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 13 Aug 2021 05:36:02 -0700 (PDT) Date: Fri, 13 Aug 2021 13:36:01 +0100 From: Chris Down To: yongw.pur@gmail.com Cc: tj@kernel.org, corbet@lwn.net, akpm@linux-foundation.org, mhocko@kernel.org, vdavydov.dev@gmail.com, tglx@linutronix.de, peterz@infradead.org, shakeelb@google.com, guro@fb.com, alexs@kernel.org, richard.weiyang@gmail.com, sh_def@163.com, sfr@canb.auug.org.au, wang.yong12@zte.com.cn, cgroups@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, yang.yang29@zte.com.cn Subject: Re: [PATCH v1] mm: Add configuration to control whether vmpressure notifier is enabled Message-ID: References: <1628855870-5070-1-git-send-email-wang.yong12@zte.com.cn> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Disposition: inline In-Reply-To: <1628855870-5070-1-git-send-email-wang.yong12@zte.com.cn> User-Agent: Mutt/2.1.1 (e2a89abc) (2021-07-12) Authentication-Results: imf25.hostedemail.com; dkim=pass header.d=chrisdown.name header.s=google header.b=egAI5MaC; dmarc=pass (policy=none) header.from=chrisdown.name; spf=pass (imf25.hostedemail.com: domain of chris@chrisdown.name designates 209.85.128.43 as permitted sender) smtp.mailfrom=chris@chrisdown.name X-Stat-Signature: zbwy9xz4cd5i5rxtpxh8fd9rh45kisc5 X-Rspamd-Queue-Id: 2E71EB008D13 X-Rspamd-Server: rspam05 X-HE-Tag: 1628858164-191344 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: yongw.pur@gmail.com writes: >From: wangyong >Inspired by PSI features, vmpressure inotifier function should also be >configured to decide whether it is used, because it is an independent >feature which notifies the user of memory pressure. > >Since the vmpressure interface is used in kernel common code, for >users who do not use the vmpressure function, there will be >additional overhead. Could you please demonstrate this additional overhead with profiles or demonstrations of other real world effects? Thanks.