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=-2.1 required=3.0 tests=DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,T_DKIM_INVALID, USER_AGENT_MUTT 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 CF13EC4321E for ; Fri, 7 Sep 2018 12:57:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 878EF2083D for ; Fri, 7 Sep 2018 12:57:48 +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="Cf+AORGd" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 878EF2083D Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728110AbeIGRif (ORCPT ); Fri, 7 Sep 2018 13:38:35 -0400 Received: from merlin.infradead.org ([205.233.59.134]:56064 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726129AbeIGRif (ORCPT ); Fri, 7 Sep 2018 13:38:35 -0400 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=hoYmGDjNXuRQo5qwI6bo14rhQyUc2nn/VukcE2VS5bI=; b=Cf+AORGdO2/34Z52xM61rBPm+ XDvxGuyq3PDbzPC0Qm//z0QT8g/2CwS1PZy1PMAGuQdJvoVCAZnjsuSmFQzS6rr6NEtUmWIqJPyAC lXy2kzO0kfvv1ydGNqj8jVmPRtXg029rJ/B84ggu/4IuJAiVl+9HjjTKQzLmHDNxe6VvBlu6Wu0E5 6PEFezIY5YfgtA2XOKenPxOizMUK4X9aBVHK74PQ1G8UTXlqWzYbeI9wBbmrNmgHUB5HVtRT6NSk2 r78CqGz6Ps39kTVuc/mD4D1kxfXwtH0QH6A31cZeU9viQKQ05fMNYLaOlxFJu9V+tAIER7KRPWWFJ MqeWBp0ww==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=hirez.programming.kicks-ass.net) by merlin.infradead.org with esmtpsa (Exim 4.90_1 #2 (Red Hat Linux)) id 1fyGKT-00026Y-Fm; Fri, 07 Sep 2018 12:57:41 +0000 Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id 2252620210312; Fri, 7 Sep 2018 14:57:40 +0200 (CEST) Date: Fri, 7 Sep 2018 14:57:40 +0200 From: Peter Zijlstra To: Vincent Guittot Cc: mingo@kernel.org, linux-kernel@vger.kernel.org, dietmar.eggemann@arm.com, jhugo@codeaurora.org Subject: Re: [PATCH] sched/fair: fix load_balance redo for null imbalance Message-ID: <20180907125740.GJ24142@hirez.programming.kicks-ass.net> References: <1536306664-29827-1-git-send-email-vincent.guittot@linaro.org> <20180907113748.GV24106@hirez.programming.kicks-ass.net> <20180907123551.GA9955@linaro.org> <20180907125554.GA24106@hirez.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20180907125554.GA24106@hirez.programming.kicks-ass.net> User-Agent: Mutt/1.10.0 (2018-05-17) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Sep 07, 2018 at 02:55:54PM +0200, Peter Zijlstra wrote: > > Beside this patch, I'm preparing another patch in fix small imbalance to > > ensure 1 task per CPU in similar situation but according to the comment above, > > we can reach this situation because of tasks priority > > Didn't we all hate fix_small_imbalance() ? That is, all that load_per_task business is complete rubbish in this cgroup world.