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 X-Spam-Level: X-Spam-Status: No, score=-5.0 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 39D87C33C99 for ; Tue, 7 Jan 2020 09:26:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0262820656 for ; Tue, 7 Jan 2020 09:26:42 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="k4d4RCpD" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727427AbgAGJ0l (ORCPT ); Tue, 7 Jan 2020 04:26:41 -0500 Received: from merlin.infradead.org ([205.233.59.134]:48466 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726327AbgAGJ0k (ORCPT ); Tue, 7 Jan 2020 04:26:40 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=merlin.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=7LXGKqEB8d1jaEq0t+nYJyGnQP5F5/lyG/MXlObSLcI=; b=k4d4RCpD+3eGCW08wcNKYwDKO yJ+LaKgFv1cAf/68MIBFpUvSvzQJrf5DDI3s8eCXrcwoEdrMkIsEt0qJZmPek51HutwKAHFFMKQTN rmT4kiPk4/lLVf68pMbpZgrLNDriLjVoA4ucIXEjz1FjTE6ijHAC4UVKtvf+REcrn4A+gyxXopOfv iYKsDF280hZUJswjy+CFeSMVSM/fbgpP/N5OaR8aIAK6F6pPz9Kl63LB4S46tiW3kEgHMS5W8aV6c Y6LMrJssw7xvaRHYGVVV03Z/hYV5U7gSyShFfgNPQtyZyvEUWpLFviL8dwbDYeQ2QV6AsSV0jXT/I EvHAoMTnA==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=noisy.programming.kicks-ass.net) by merlin.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1iol8F-0004dF-2s; Tue, 07 Jan 2020 09:26:35 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id 5E4143012C3; Tue, 7 Jan 2020 10:25:01 +0100 (CET) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id CBB302B2BC31A; Tue, 7 Jan 2020 10:26:33 +0100 (CET) Date: Tue, 7 Jan 2020 10:26:33 +0100 From: Peter Zijlstra To: Scott Wood Cc: Frederic Weisbecker , Thomas Gleixner , Ingo Molnar , linux-kernel@vger.kernel.org Subject: Re: [PATCH 4/4] timers/nohz: Update nohz load in remote tick Message-ID: <20200107092633.GT2844@hirez.programming.kicks-ass.net> References: <1576538545-13274-1-git-send-email-swood@redhat.com> <1576538545-13274-4-git-send-email-swood@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1576538545-13274-4-git-send-email-swood@redhat.com> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Dec 16, 2019 at 06:22:25PM -0500, Scott Wood wrote: > From: Peter Zijlstra > > The way loadavg is tracked during nohz only pays attention to the load > upon entering nohz. This can be particularly noticeable if full nohz is > entered while non-idle, and then the cpu goes idle and stays that way for > a long time. > > Use the remote tick to ensure that full nohz cpus report their deltas > within a reasonable time. > > [swood: added changelog and removed recheck of stopped tick] > Signed-off-by: Scott Wood > --- > This patch was provided by Peter in an unsigned email reply -- > Peter, can I get a signoff? Here goes, glad it works :-) Signed-off-by: Peter Zijlstra (Intel)