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[82.17.115.212]) by smtp.gmail.com with ESMTPSA id ba27sm2815015wrb.61.2022.02.24.05.28.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 24 Feb 2022 05:28:18 -0800 (PST) Date: Thu, 24 Feb 2022 13:28:16 +0000 From: Aaron Tomlin To: Marcelo Tosatti Cc: Aaron Tomlin , Frederic Weisbecker , Christoph Lameter , tglx@linutronix.de, mingo@kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Phil Auld Subject: Re: [RFC PATCH] tick/sched: Ensure quiet_vmstat() is called when the idle tick was stopped too Message-ID: <20220224132816.qsfa66ao3xdjdxxx@ava.usersys.com> X-PGP-Key: http://pgp.mit.edu/pks/lookup?search=atomlin%40redhat.com X-PGP-Fingerprint: 7906 84EB FA8A 9638 8D1E 6E9B E2DE 9658 19CC 77D6 References: <20220203214339.1889971-1-atomlin@redhat.com> <20220217124729.GA743618@lothringen> <20220217142615.xqtiydixvnumyvei@ava.usersys.com> <20220217163205.GA748087@lothringen> <20220218125454.utlgmuhijklzr3if@ava.usersys.com> <20220219154616.pwsvh445x3vn7ltf@ava.usersys.com> <20220224130014.rmhtx3xlepybuxn2@ava.usersys.com> MIME-Version: 1.0 In-Reply-To: X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Authentication-Results: imf13.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=YSv8iK34; dmarc=pass (policy=none) header.from=redhat.com; spf=none (imf13.hostedemail.com: domain of atomlin@redhat.com has no SPF policy when checking 170.10.129.124) smtp.mailfrom=atomlin@redhat.com X-Rspam-User: X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 96C0220007 X-Stat-Signature: terwc7kscpz486ac6bou3jpnf6t3u85n X-HE-Tag: 1645709302-295880 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 Thu 2022-02-24 10:14 -0300, Marcelo Tosatti wrote: > If the per-CPU vmstat_update is limited to happen once per second, that > shouldnt be a significant performance impact? Perhaps not. Albeit, is the interrupt worth it? Then again it could indeed be a long time before the idle task is selected and a return to idle code were we'd check for any remaining differentials with the aforementioned patch. Kind regards, -- Aaron Tomlin