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Mon, 01 Mar 2021 07:11:56 -0800 (PST) Received: from localhost ([2620:10d:c091:480::1:c0b0]) by smtp.gmail.com with ESMTPSA id a14sm9274552qkc.47.2021.03.01.07.11.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 01 Mar 2021 07:11:56 -0800 (PST) Date: Mon, 1 Mar 2021 10:11:55 -0500 From: Johannes Weiner To: Pintu Kumar Cc: linux-kernel@vger.kernel.org, akpm@linux-foundation.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-doc@vger.kernel.org, jaewon31.kim@samsung.com, yuzhao@google.com, shakeelb@google.com, guro@fb.com, mchehab+huawei@kernel.org, xi.fengfei@h3c.com, lokeshgidra@google.com, nigupta@nvidia.com, famzheng@amazon.com, andrew.a.klychkov@gmail.com, bigeasy@linutronix.de, ping.ping@gmail.com, vbabka@suse.cz, yzaikin@google.com, keescook@chromium.org, mcgrof@kernel.org, corbet@lwn.net, pintu.ping@gmail.com Subject: Re: [PATCH] mm: introduce clear all vm events counters Message-ID: References: <1614595766-7640-1-git-send-email-pintu@codeaurora.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1614595766-7640-1-git-send-email-pintu@codeaurora.org> X-Stat-Signature: qb1iuedofw4jx5tm7j8bur3oksgse5wq X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 8D2B2A0009DA Received-SPF: none (cmpxchg.org>: No applicable sender policy available) receiver=imf15; identity=mailfrom; envelope-from=""; helo=mail-qt1-f174.google.com; client-ip=209.85.160.174 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1614611524-652097 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 Mon, Mar 01, 2021 at 04:19:26PM +0530, Pintu Kumar wrote: > At times there is a need to regularly monitor vm counters while we > reproduce some issue, or it could be as simple as gathering some system > statistics when we run some scenario and every time we like to start from > beginning. > The current steps are: > Dump /proc/vmstat > Run some scenario > Dump /proc/vmstat again > Generate some data or graph > reboot and repeat again You can subtract the first vmstat dump from the second to get the event delta for the scenario run. That's what I do, and I'd assume most people are doing. Am I missing something?