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=-7.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 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 A8D04C433E0 for ; Mon, 18 Jan 2021 05:29:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 65FBF2231F for ; Mon, 18 Jan 2021 05:29:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730836AbhARF3P (ORCPT ); Mon, 18 Jan 2021 00:29:15 -0500 Received: from mail.kernel.org ([198.145.29.99]:34738 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726390AbhARF3M (ORCPT ); Mon, 18 Jan 2021 00:29:12 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 64FA3224B0; Mon, 18 Jan 2021 05:28:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1610947712; bh=QgTMGxJAe9tdBp0x6ptsNNJxv9UF/dz02YHMLIgPMH8=; h=Date:From:To:Cc:Subject:Reply-To:References:In-Reply-To:From; b=Sa2G+kKqlulYKSgkLYc2GqYTmD7NY77qpQwoaPgkg+Kag8IpH6a99cItfmCN5eJ1k G4xE1/NPd0SkWPPNJO9phPAzSAaVIPrcOSyb7gzBc2lKXiiivtS4FU9CvZ45URue9i GHBS0P2wvOM49+5xN2FKEo026RUvcp/ftYgAAhqcyIqObrSQ0SGIziupFzs5VyEge8 V1EOEgWN+MPyeQUhNI8j8bWu2lD+WVfoYSYYvArlOQmzLteQ9jyXtX0TGGTt670/c5 xLJSyAhYEnoCwNQMioSXLwUi/+oVUe+pfXkxqXoTr3XHJrAr++M6AVw49SPjW+DX4K B5mdRebPbULTw== Received: by paulmck-ThinkPad-P72.home (Postfix, from userid 1000) id 24BD435231E2; Sun, 17 Jan 2021 21:28:32 -0800 (PST) Date: Sun, 17 Jan 2021 21:28:32 -0800 From: "Paul E. McKenney" To: Peter Zijlstra Cc: mingo@kernel.org, tglx@linutronix.de, linux-kernel@vger.kernel.org, jiangshanlai@gmail.com, valentin.schneider@arm.com, cai@redhat.com, vincent.donnefort@arm.com, decui@microsoft.com, vincent.guittot@linaro.org, rostedt@goodmis.org, tj@kernel.org Subject: Re: [PATCH 0/8] sched: Fix hot-unplug regressions Message-ID: <20210118052832.GA13850@paulmck-ThinkPad-P72> Reply-To: paulmck@kernel.org References: <20210116113033.608340773@infradead.org> <20210116154859.GR2743@paulmck-ThinkPad-P72> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210116154859.GR2743@paulmck-ThinkPad-P72> User-Agent: Mutt/1.9.4 (2018-02-28) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sat, Jan 16, 2021 at 07:48:59AM -0800, Paul E. McKenney wrote: > On Sat, Jan 16, 2021 at 12:30:33PM +0100, Peter Zijlstra wrote: > > Hi, > > > > These patches (no longer 4), seems to fix all the hotplug regressions as per > > nearly a 100 18*SRCU-P runs over-night. > > Nice!!! > > > I did clean up the patches, so possibly I wrecked it again. I've started new > > runs and will again leave them running over-night. > > > > Paul, if you could please also throw your monster machine at it. > > Will do as soon as the tests I started yesterday complete, which should > be this afternoon, Pacific Time. > > My thought is to do the full set of scenarios overnight, then try > hammering either SRCU-P and/or whatever else shows up in the overnight > test. Seem reasonable? And the SRCU-P runs did fine. I got some task hangs on TREE03 and (to a lesser extent) TREE04. These might well be my fault, so I will try bisecting tomorrow, Pacific Time. Thanx, Paul