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=-2.6 required=3.0 tests=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 19116C2D0CE for ; Sun, 15 Dec 2019 20:56:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E43B32467A for ; Sun, 15 Dec 2019 20:56:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1576443419; bh=P3lfOLQN58AvTesW0ND/Xvyc4RVCSmd/MxkVTZFTRZ4=; h=Date:From:To:Cc:Subject:Reply-To:References:In-Reply-To:List-ID: From; b=RnL2iIbPELYZlvVh+Zd6Uiw+aP4rcMmCzK9lT4FRwqAKRbDrjZVevqVQE+U+f4+l0 bT7hpiiEmlHxXVJk84QXF4hktOQOJApGHI+ksYVLnRnHrNTw/r3U4YVWmVI6SSvS9o Ww1N5WhohfqAG6dCsrWkMkE+U+mAme7VruT23Yqg= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726536AbfLOU46 (ORCPT ); Sun, 15 Dec 2019 15:56:58 -0500 Received: from mail.kernel.org ([198.145.29.99]:39154 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726146AbfLOU45 (ORCPT ); Sun, 15 Dec 2019 15:56:57 -0500 Received: from paulmck-ThinkPad-P72.home (50-39-105-78.bvtn.or.frontiernet.net [50.39.105.78]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id DAD1824673; Sun, 15 Dec 2019 20:56:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1576443416; bh=P3lfOLQN58AvTesW0ND/Xvyc4RVCSmd/MxkVTZFTRZ4=; h=Date:From:To:Cc:Subject:Reply-To:References:In-Reply-To:From; b=u8sU9E7JVDTFYAsBlwTHyn+MZ7IXDLFjixO5cwVR7Nlp3S6inP+ENIQOVhY4+iRcl ZASKiPQMYKiOOY+Je5PZsc/imCUlMmT0OB2Sa1JKngqNkeu1obkDohVsENz66fSlHg pfvIioaWESCu83R5Dy3b1wZ8+BBe7dR6eaFgWtWM= Received: by paulmck-ThinkPad-P72.home (Postfix, from userid 1000) id B2168352274B; Sun, 15 Dec 2019 12:56:56 -0800 (PST) Date: Sun, 15 Dec 2019 12:56:56 -0800 From: "Paul E. McKenney" To: Dexuan Cui Cc: Dexuan-Linux Cui , Qian Cai , "Joel Fernandes (Google)" , Tejun Heo , Josh Triplett , Steven Rostedt , "rcu@vger.kernel.org" , Linux Kernel Mailing List , Lili Deng , Baihua Lu Subject: Re: "rcu: React to callback overload by aggressively seeking quiescent states" hangs on boot Message-ID: <20191215205656.GO2889@paulmck-ThinkPad-P72> Reply-To: paulmck@kernel.org References: <20191213224646.GH2889@paulmck-ThinkPad-P72> <20191214064048.GI2889@paulmck-ThinkPad-P72> <20191215202023.GM2889@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) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, Dec 15, 2019 at 08:40:40PM +0000, Dexuan Cui wrote: > > From: Paul E. McKenney > > Sent: Sunday, December 15, 2019 12:20 PM > > > > This is consistent with what I saw in Qian Cai's report, FYI. So I > > am very interested in learning whether the first patch in my reply [1] > > helps you. > > Thanx, Paul > > Hi Paul, yes, your first patch (the below) can fix the hang issue: > > commit e8d6182b015bdd8221164477f4ab1c307bd2fbe9 > Author: Paul E. McKenney > Date: Sun Dec 15 10:59:06 2019 -0800 > > squash! rcu: React to callback overload by aggressively seeking quiescent states Thank you! May I add your Tested-by? Thanx, Paul