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=-0.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no 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 B79CEC433B4 for ; Sat, 15 May 2021 08:37:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8C8E1613FC for ; Sat, 15 May 2021 08:37:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234461AbhEOIi2 (ORCPT ); Sat, 15 May 2021 04:38:28 -0400 Received: from mout.gmx.net ([212.227.17.21]:50595 "EHLO mout.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229445AbhEOIiV (ORCPT ); Sat, 15 May 2021 04:38:21 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gmx.net; s=badeba3b8450; t=1621067782; bh=63KxS4mqnuOPyJ6F4sl+aqr2F0EgHsdc7QMN4zX55+I=; h=X-UI-Sender-Class:Subject:From:To:Cc:Date:In-Reply-To:References; b=PlSh/BN/ZtoETMjeCjp65B6XG85XDxgtFEIk3R2XIsTtIO2BkeI0BoSZ1w/4rRAau kCAgkM8Urx7DHlQ5TvB5vMv3In7OQ+hawa5XrdRb4FWaYxVfiDW0HYOgFCpNZMVwuv e9B0ZkNGS6bUGSag435cRupSrzNmlXNg/g1yuMB8= X-UI-Sender-Class: 01bb95c1-4bf8-414a-932a-4f6e2808ef9c Received: from homer.fritz.box ([185.221.150.221]) by mail.gmx.net (mrgmx105 [212.227.17.168]) with ESMTPSA (Nemesis) id 1N3siG-1lZ08z3ZUe-00zpLp; Sat, 15 May 2021 10:36:21 +0200 Message-ID: <752d89013a703a2a4bd32b4be196e84a9065b060.camel@gmx.de> Subject: Re: [PATCH v2 3/3] sched/fair: break out of newidle balancing if an RT task appears From: Mike Galbraith To: Peter Zijlstra , Scott Wood Cc: Ingo Molnar , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Mel Gorman , Valentin Schneider , linux-kernel@vger.kernel.org, linux-rt-users@vger.kernel.org, Sebastian Andrzej Siewior , Thomas Gleixner Date: Sat, 15 May 2021 10:36:19 +0200 In-Reply-To: <284735cfa1b23484cb0aaeb896067cbf888ac6af.camel@gmx.de> References: <20210428232821.2506201-1-swood@redhat.com> <20210428232821.2506201-4-swood@redhat.com> <284735cfa1b23484cb0aaeb896067cbf888ac6af.camel@gmx.de> Content-Type: text/plain; charset="ISO-8859-15" User-Agent: Evolution 3.34.4 MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Provags-ID: V03:K1:n/WeMyrUVHimaca42rioNVkS6DTf6uaK+5xkEwJRspkEC/Z9vGt RWK7BjqJZW4K3IAfsxtj4H/BtqKS0eM7PYHYsYknE+Z2TgwHVqhcPAmIue25GbRjBK8vgNW rLF4ss3ofvSD1SVfrkltOQz0tCAIn7XM1YiMtDcLSCohboFOrFbzd/9K6RBaLkIZMUmxGGu vtCHYAchzDb89SQoLKBow== X-UI-Out-Filterresults: notjunk:1;V03:K0:+LoyvyClCZE=:wykXHgLFUyOl2MkUv4naq5 vKr9SKFIdmKZIUdr2s5FbpdT3A7ZeefPN+nCrPldk8q7NwCSHBpwW0LT/VdhRGba3GR8WYxY+ 6Q4sgJVBYd3Dzcm2NhMhp/7W3S/l94fz1IVJGJfZUIlKzI6TBekyCSikCube5lLsaIVbohqhh bw5R0g7bLYwrYyUilJq1LX3Ux3/nqpI23+X2lBcLu72m4luYkng6+5EBHwQ0LE74y1+Kl15lI +0uIJbxN9ZSPH4a8A8NNxzYc9mSALvfmgucPJM09uMtf5v8fWTMS80jaDaZGbT7VOGg/p9P/1 0ADiji5tn8VghskC9q513VMm8UCFMnUq6OPb1Q9LmWIPdZr1lzonn3jdorj1bFmvLIBF0Cn0F V9ssT/+KGNOM/FUTb1Qh0I5ZNpiPBkMjSpEfcMsqT5dBcEbAaJV7o2fydnZmaszko0UKtI7aM duFHWIEj5Zc6StcjQkdeu/HuRvW/afgr0fwWuhJoBf5TMfmhX22VqaLSxYbHN1bTouahLjA8c 54I1f163eY1H+6xgB/+bC4C9Ur27btJRoIBFY+h7csnQ9PjampRcF8EHwbyBGujLegeZok899 m30SOzN2OHwL5iZWyIyPLCKXko+nT3zLGJQqYYx1ja0A3hzr0QDTCkkffWtvAvF0q3osSlAAg NH/bkbOkIYmKFanlSncUA7l5sYSFbq4oaI5bHb0DCByitMQInNzc5v/xFUqJDPXXup45nS75u NgCYUX69RMiewrjN4QkSNmgXqc/XKH9lL6IeWxZZm1tSSV5Xt6Gjtv/WuCmvvhN1oQgorLbLc 9KseCJSxtsNLP1mNMOFLtwjZalCXgXdf8u82mF6EMMn4Mix8MhoDrqRWz/r/yWH8tY9sYBhdL oMstucWcWUWL6cNG2Mqye1kNq4L8UTMgwDRquSip52xvhyc4UU7BB2CdOr7yQEguw+/JlDitN LtCTEmD4QDaKH2+sPK0TDepNtn98CGDcg32Ka+xJMka9FEEx8pqi+yt0Bs8eAgDcPduzekwYX 9vDJGyqFZBFZQkUOJTdDSm6ibvHYrIVh+biPYzdVZFMyBDifTpz3IWrU3//WTp8pcuIpgWGZh dPBt3S4lp8wdlQqtfWsqSFfD8l60FJxvGGx/pVAO6/f2DXLOt6vnpLDBwfUwM8ognHGaHTJPg njYKfd9phRbHWCO63fBbTnu38/oZ2ZdeEpk9KGfdUzLnCe9DevD6eWfpLHPBKLB4ivREU= Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org P.S. The largest I spotted before boredom won: kworker/3:1-22161 [003] d...2.. 11559.111261: load_balance: NEWIDLE rq:4 lock acquired kworker/0:0-21137 [000] d...1.. 11559.111262: load_balance: NEWIDLE rq:4 locked - aborting kworker/7:1-20870 [007] d...1.. 11559.111262: load_balance: NEWIDLE rq:4 locked - aborting <...>-22133 [002] d...1.. 11559.111263: load_balance: NEWIDLE rq:4 locked - aborting kworker/6:1-22213 [006] d...1.. 11559.111263: load_balance: NEWIDLE rq:4 locked - aborting 5/8 of a 128 rq box meeting like that is.. hopefully impossible :) -Mike