From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B08D5C433EF for ; Thu, 24 Feb 2022 13:28:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234886AbiBXN25 (ORCPT ); Thu, 24 Feb 2022 08:28:57 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40828 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234869AbiBXN2x (ORCPT ); Thu, 24 Feb 2022 08:28:53 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 7CC3FB0E86 for ; Thu, 24 Feb 2022 05:28:22 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1645709301; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=psZr4jDZFA2vXRGitiJpCpve4DYNl/gB1HAhwDvFOEM=; b=jFx8yeM/Gs5BifaIN1+LO7TZMpWhX18uQqDj3U8xR2dVpGGP1yWTWYBjRr+SJeiLW629wu UVOuHLIq9WwLsiLYR+Rq/YBU7zSCQ0VpPErYyG6kkHmw7UHgQtR31Lp8gDp1S//Ni7VCYg 47HP5XA0fZNuJA59X/DsoTlQMhf21zQ= Received: from mail-wr1-f71.google.com (mail-wr1-f71.google.com [209.85.221.71]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-637-DbZy4lSIPF-Z0GrVSVZMXA-1; Thu, 24 Feb 2022 08:28:20 -0500 X-MC-Unique: DbZy4lSIPF-Z0GrVSVZMXA-1 Received: by mail-wr1-f71.google.com with SMTP id c16-20020adfa310000000b001ed9cd8f4c7so766792wrb.6 for ; Thu, 24 Feb 2022 05:28:20 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=psZr4jDZFA2vXRGitiJpCpve4DYNl/gB1HAhwDvFOEM=; b=DpJIOtPUdQ/Vk2pIAZZU2ZNvH1ae10e8oYX5O7B2GWSInFWBy2ekjyu1PbNN6s/e5n vmz7zHTAdGgFIt7s7KlpXOHZD7+tkLvmgkYnGpL5KULArXXz5Atux6lvjTon2RgqvRGZ cP2D15d/UyNjnLCN583p6J/CiKXDJ5kmhcmbR3dC9m0LRzzr9KbkYReNisvTZjPqYNTL 3jsCxxju9dLAOsw4XGFGQl/yItzvR3GRVYVHG/sasGnP7NTdwF5oQDqY8pCQBBna93Gr J6e17hilk5NH8vXf2TtwE24NXtBcXws7Tlrja6ekwJcj9CwRnWhrB6I4nU8PJW1sK6ko eexQ== X-Gm-Message-State: AOAM533uPyYnNb3zXTLlETkIQoCO9gZ6rkdt3h4ApBHjTyyeilUWjekb +voRSt9nr/w674ZqR+7k+tCjwoPGGEAy1gyD3tYqogJ1KKDPMFwQEv3/1ihIa8UVl6KQ4ubwddw l4dq7M9GLQFcO5VGYm9WPgGw= X-Received: by 2002:a5d:6a4e:0:b0:1e4:b619:52b0 with SMTP id t14-20020a5d6a4e000000b001e4b61952b0mr2158393wrw.504.1645709299420; Thu, 24 Feb 2022 05:28:19 -0800 (PST) X-Google-Smtp-Source: ABdhPJw5cFa1a1boJUcrdDPIdjZCohUc+uHn6SwTHV0xA9uehxBSNdr0AG9/cLNR0CXvMFzZI+bhEA== X-Received: by 2002:a5d:6a4e:0:b0:1e4:b619:52b0 with SMTP id t14-20020a5d6a4e000000b001e4b61952b0mr2158377wrw.504.1645709299163; Thu, 24 Feb 2022 05:28:19 -0800 (PST) Received: from localhost (cpc111743-lutn13-2-0-cust979.9-3.cable.virginm.net. [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 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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