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 AE8B1C433EF for ; Mon, 25 Apr 2022 14:51:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242486AbiDYOyV (ORCPT ); Mon, 25 Apr 2022 10:54:21 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42838 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229819AbiDYOyU (ORCPT ); Mon, 25 Apr 2022 10:54:20 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 27C7364CA for ; Mon, 25 Apr 2022 07:51:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1650898275; 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=7Cq4af9zXFtyWFTPQYSYW60+ZqAJ/Qje6bRIbvw79WA=; b=duDZ49xlxIIjIcxUzxl2NlcNlhHRFpOvqGqvpd30zkCImjbCNy9Pt5rciyCKsiEQdB9GIE RnHmcXKBjX7LoVmdpussJ1LHnoG0JIRU1lQGXVZmzbuCF4EOJ2+vscEuMqlBv8FGQxBEQw jLx4RNkan1hnCc+oAR8s5VvZ2RmWtqI= Received: from mail-wm1-f72.google.com (mail-wm1-f72.google.com [209.85.128.72]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-230-pvYgYTAYP0mqQa0Yr_IOzQ-1; Mon, 25 Apr 2022 10:51:14 -0400 X-MC-Unique: pvYgYTAYP0mqQa0Yr_IOzQ-1 Received: by mail-wm1-f72.google.com with SMTP id d13-20020a05600c3acd00b0038ff865c043so10388529wms.3 for ; Mon, 25 Apr 2022 07:51:13 -0700 (PDT) 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=7Cq4af9zXFtyWFTPQYSYW60+ZqAJ/Qje6bRIbvw79WA=; b=TIRL7TSpk7hSchhW6YpnPxK3fsKotcTkFA5skkHFxlZMmKecHdRJC50S5j2yonCyC7 0bT86uEU0jDq39jqwFEHLhERXXkjR7ORy+CzwRoMTgG/jncx8AA1rQAUD2b5Fg2AXnL/ 8fg09U1RY+dS+gHshSENp6TP47/b4FNqdund9nrjr8+Nj+1t4Rosz0gKqALONxASjWZd Vq3+E4QnfD43QCDg4P8tprh/MvAh8lHmsnthaUGeFi8Q4H+x9EDwN5/853RDztSOWPVB InB2o0AZzqaw99wtwEqzoUrupOcUtbgTR1OmiteEtqUaQQA1rxqkDfFGOkuwjMWqyAhe ITMA== X-Gm-Message-State: AOAM530yFTs2r6vIietUG2qbPoTUxJTOyMoPxpTALI4O8/5zcmZoe++a rdlLwKqyxRVkyx6ecRuSol7nZYzySmfaeUFX1O0SVZbXR7k1Jgno+U0GJYDtOem7CIKq1LzPbUR q0lB+PFcXn/I/XQoyX0wDFtQ= X-Received: by 2002:a5d:584e:0:b0:20a:9122:2c3c with SMTP id i14-20020a5d584e000000b0020a91222c3cmr14551930wrf.193.1650898271746; Mon, 25 Apr 2022 07:51:11 -0700 (PDT) X-Google-Smtp-Source: ABdhPJyzYrwVElWy2gr0bSKJTXkRO7AqEyqH2mM3C3/Vq8lwAVd/Q/IrCzPIJwEVJtSkbNiNyPbbGw== X-Received: by 2002:a5d:584e:0:b0:20a:9122:2c3c with SMTP id i14-20020a5d584e000000b0020a91222c3cmr14551916wrf.193.1650898271550; Mon, 25 Apr 2022 07:51:11 -0700 (PDT) Received: from localhost (cpc111743-lutn13-2-0-cust979.9-3.cable.virginm.net. [82.17.115.212]) by smtp.gmail.com with ESMTPSA id f14-20020a0560001a8e00b0020aaf034e59sm11263209wry.90.2022.04.25.07.51.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 25 Apr 2022 07:51:10 -0700 (PDT) Date: Mon, 25 Apr 2022 15:51:09 +0100 From: Aaron Tomlin To: Christoph Lameter Cc: Peter Zijlstra , frederic@kernel.org, mtosatti@redhat.com, tglx@linutronix.de, mingo@kernel.org, pauld@redhat.com, neelx@redhat.com, oleksandr@natalenko.name, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [RFC PATCH v3] tick/sched: Ensure quiet_vmstat() is called when the idle tick was stopped too Message-ID: <20220425145109.td4b7npcom4xgcli@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: <20220422193647.3808657-1-atomlin@redhat.com> <20220425113909.u3smtztp66svlw4o@ava.usersys.com> <20220425132700.GK2731@worktop.programming.kicks-ass.net> 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 Mon 2022-04-25 16:06 +0200, Christoph Lameter wrote: > It may depend though on how long the idle periods are. Do we have > statistics on the duration? Always folding the vmstat deltas may also > increase the length of the idle periods. Unfortunately I do not. I noticed that this situation can occur via source code and vmcore analysis. Kind regards, -- Aaron Tomlin