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 C16DAE81DFF for ; Fri, 6 Oct 2023 14:02:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232461AbjJFOCq (ORCPT ); Fri, 6 Oct 2023 10:02:46 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40684 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232335AbjJFOCn (ORCPT ); Fri, 6 Oct 2023 10:02:43 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4FA61A6; Fri, 6 Oct 2023 07:02:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Transfer-Encoding: Content-Type:MIME-Version:References:Message-ID:Subject:Cc:To:From:Date: Sender:Reply-To:Content-ID:Content-Description; bh=N8UPfLYf9vEiYVIDXQNO7a8O1EepdVqeUPWrMOmuJzs=; b=VRxWZ/BeNe73kUZrTnO4pRJoyG u9dYWBYXIxukJki49sKewpmGaQx6/JpPVe7T7ubfwuY08bfwl7xBsxzNQ7XnAv8jtnKZWdktkULec zwJdtJyG5wBnal557U8WDHw1LzESJEEVto7coOTQDUXFoyDZ6y7fk20VQes8DsDVKLjRsuVgB+Mv8 Vka+zcf7GqK08PUjQk1P5KIghTdaX0q0FQyPb1AKoDTW12t8931P6qBMvjzv9jF7te37ewxKzKlTB 3G5kLwLawvJCRUNZZoklnIJztHpBPXN4oKI7h+MY1amHzhnyOHXZhtu864/5QX0dzpC+vmT1bNKk0 Dhowh6qQ==; Received: from j130084.upc-j.chello.nl ([24.132.130.84] helo=noisy.programming.kicks-ass.net) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1qolNi-00FgnE-VS; Fri, 06 Oct 2023 14:00:43 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id 8251A300392; Fri, 6 Oct 2023 16:00:42 +0200 (CEST) Date: Fri, 6 Oct 2023 16:00:42 +0200 From: Peter Zijlstra To: Mike Galbraith Cc: Marek Szyprowski , Biju Das , "bsegall@google.com" , "bristot@redhat.com" , "chris.hyser@oracle.com" , "corbet@lwn.net" , "dietmar.eggemann@arm.com" , "gregkh@linuxfoundation.org" , "joel@joelfernandes.org" , "joshdon@google.com" , "juri.lelli@redhat.com" , "kprateek.nayak@amd.com" , "linux-kernel@vger.kernel.org" , "mingo@kernel.org" , "patrick.bellasi@matbug.net" , Pavel Machek , "pjt@google.com" , "qperret@google.com" , "qyousef@layalina.io" , "rostedt@goodmis.org" , "tglx@linutronix.de" , "tim.c.chen@linux.intel.com" , "timj@gnu.org" , "vincent.guittot@linaro.org" , "youssefesmat@chromium.org" , "yu.c.chen@intel.com" , "mgorman@suse.de" , "linux-renesas-soc@vger.kernel.org" Subject: Re: [PATCH] sched/fair: fix pick_eevdf to always find the correct se Message-ID: <20231006140042.GG36277@noisy.programming.kicks-ass.net> References: <20231005150258.GA36277@noisy.programming.kicks-ass.net> <553e2ee4-ab3a-4635-a74f-0ba4cc03f3f9@samsung.com> <867f5121d7d010cacf938c293f862b0cea560ec2.camel@gmx.de> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <867f5121d7d010cacf938c293f862b0cea560ec2.camel@gmx.de> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Oct 06, 2023 at 12:31:28PM +0200, Mike Galbraith wrote: > On Fri, 2023-10-06 at 10:35 +0200, Marek Szyprowski wrote: > > > > > > Just to note, I've run into this issue on the QEmu's 'arm64/virt' > > platform, not on the Samsung specific hardware.  > > It doesn't appear to be arch specific, all I have to do is enable > autogroup, raspberry or x86_64 desktop box, the occasional failure > tripping over task groups, leaving both best and best_left with > identical but not what we're looking for ->min_deadline. OK, autogroups enabled and booted, /debug/sched/debug shows autogroups are indeed in existence. I've ran hackbench and a kernel build, but no whoopsie yet :-( I suppose I'll kick some benchmarks and go make a cup 'o tea or something.