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=-7.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,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 DEBF5C433E0 for ; Sun, 27 Dec 2020 16:03:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A5A7B206ED for ; Sun, 27 Dec 2020 16:03:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726253AbgL0QDC (ORCPT ); Sun, 27 Dec 2020 11:03:02 -0500 Received: from mail.kernel.org ([198.145.29.99]:57704 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726117AbgL0QDB (ORCPT ); Sun, 27 Dec 2020 11:03:01 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 7203122512; Sun, 27 Dec 2020 16:02:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1609084940; bh=0vg7M7y/o+3nZ+KECAO25hYa8OZo8S9gmKnQKy+rQgQ=; h=Date:From:To:Cc:Subject:Reply-To:References:In-Reply-To:From; b=l7CHi1d9H3wJjUMl620CzmmYVVm4e9EiZsR4nSdzppWa3b0hZN45aCyo3bzVk77Rc bJORCoqNAdk2W6q5u1NhQ3/VS65eRT+svItR9NqtsnarWS79F7jAKjljQFNihBAhFZ VbBmshpNTHpuNk1YniBqPo4UnLy9iVyB7+rmiVinf5c2I/sCz6LJZxXjazrp06gjBR XFOngjcPKHFn3BF6jeUF4uBbxroee0rKK2+391YQypknuUliXNWR+15kl0RAPQDTiG 01n4eWI7RBeAVqbVQyZEKTXEHGGDjB/65VedMGcxRmx21uPIcXtXmB7Vm4PjXCnUF1 K+J5nhLRzsgWw== Received: by paulmck-ThinkPad-P72.home (Postfix, from userid 1000) id 34DBE35226B3; Sun, 27 Dec 2020 08:02:20 -0800 (PST) Date: Sun, 27 Dec 2020 08:02:20 -0800 From: "Paul E. McKenney" To: Lai Jiangshan Cc: Hillf Danton , LKML , Valentin Schneider , Peter Zijlstra , Qian Cai , Vincent Donnefort , Lai Jiangshan , Tejun Heo Subject: Re: [PATCH -tip V2 00/10] workqueue: break affinity initiatively Message-ID: <20201227160220.GK2657@paulmck-ThinkPad-P72> Reply-To: paulmck@kernel.org References: <20201218170919.2950-1-jiangshanlai@gmail.com> <20201226103421.6616-1-hdanton@sina.com> <20201226145239.GJ2657@paulmck-ThinkPad-P72> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.9.4 (2018-02-28) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, Dec 27, 2020 at 10:08:51PM +0800, Lai Jiangshan wrote: > On Sat, Dec 26, 2020 at 10:52 PM Paul E. McKenney wrote: > > > > > > > Can you please specify a bit what you encountered in rcutorture > > > before this patchset? You know we cant have a correct estimation > > > of the fix diameter without your help. > > > > > It triggers the following in sched_cpu_dying() in kernel/sched/core.c, > > exactly the same as for Lai Jiangshan: > > > > BUG_ON(rq->nr_running != 1 || rq_has_pinned_tasks(rq)) > > > > Which is in fact the "this" in my earlier "rcutorture hits this". ;-) > > > > Thanx, Paul > > > > Hi, Hillf > > https://lkml.org/lkml/2020/12/22/141 > > >From the email, I think rcutorture encountered the same problem. > > Hi, Paul > > I'm sorry to forget to add your Tested-by. No need to apologize, especially given that I didn't get around to testing it until after it was pulled into -tip. ;-) Thank you for the patch series! Thanx, Paul