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_PASS,USER_AGENT_MUTT autolearn=ham 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 10D15C10F13 for ; Mon, 8 Apr 2019 14:50:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CB3DA214C6 for ; Mon, 8 Apr 2019 14:50:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1554735029; bh=6IgzYcktMsnwShi7rOPqYFxVZX5M6eY54YvO+fqZACI=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=TkVtlGZ8E99TR4apBrHfHZEnhJye2UOAcRgyUZsy6iNVxCfI6c6U31bDyx+TDboUY NAjRMDq8EM/vZ4aJC06rTiCpHNebewkyr7fp9Kr4GzWEK+OEGSMv0ElSBrdAmf9wgU HMutclVAz9pfo1Qy75gqFlh2/exJxT2Jeds3XShE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726717AbfDHOu3 (ORCPT ); Mon, 8 Apr 2019 10:50:29 -0400 Received: from mail.kernel.org ([198.145.29.99]:45620 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726005AbfDHOu3 (ORCPT ); Mon, 8 Apr 2019 10:50:29 -0400 Received: from localhost (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (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 096CE2147A; Mon, 8 Apr 2019 14:50:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1554735028; bh=6IgzYcktMsnwShi7rOPqYFxVZX5M6eY54YvO+fqZACI=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=MDAIcltMEa/o2DQv0pc5mQvCGfbCnNIctoFNzIBuV0OJkQbtwTIzgI0f/Lqld10yu tQxnb+4yOQAeh5kde1S+3sYDGZ5UhjUjJZmE9sKxWKSh59Gl95Dk7jAe1Yz7871onA Eurm0WxvQT1JhBw3UWnMq0xsRcPd8XZlQKW6leq4= Date: Mon, 8 Apr 2019 10:50:26 -0400 From: Sasha Levin To: Phil Auld Cc: tip-bot for Phil Auld , linux-tip-commits@vger.kernel.org, mingo@kernel.org, efault@gmx.de, Anton Blanchard , Ben Segall , Linus Torvalds , Peter Zijlstra , Thomas Gleixner , stable@vger.kernel.org Subject: Re: [tip:sched/core] sched/fair: Limit sched_cfs_period_timer loop to avoid hard lockup Message-ID: <20190408145026.GG4689@sasha-vm> References: <20190405141524.05DDA2186A@mail.kernel.org> <20190408134214.GC6584@lorien.usersys.redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Disposition: inline In-Reply-To: <20190408134214.GC6584@lorien.usersys.redhat.com> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org On Mon, Apr 08, 2019 at 09:42:14AM -0400, Phil Auld wrote: >On Fri, Apr 05, 2019 at 02:15:23PM +0000 Sasha Levin wrote: >> Hi, >> >> [This is an automated email] >> >> This commit has been processed because it contains a -stable tag. >> The stable tag indicates that it's relevant for the following trees: all >> >> The bot has tested the following trees: v5.0.6, v4.19.33, v4.14.110, v4.9.167, v4.4.178, v3.18.138. >> >> v5.0.6: Failed to apply! Possible dependencies: >> c0ad4aa4d841 ("sched/fair: Robustify CFS-bandwidth timer locking") >> >> v4.19.33: Failed to apply! Possible dependencies: >> c0ad4aa4d841 ("sched/fair: Robustify CFS-bandwidth timer locking") >> >> v4.14.110: Failed to apply! Possible dependencies: >> c0ad4aa4d841 ("sched/fair: Robustify CFS-bandwidth timer locking") >> > >This is a minor context difference. There is no actual dependency on the >c0ad4aa4d841 patch. It would be easy to produce new version that could >go in these trees. I'm not sure what the right action is in that case. >Should I spin a new version with the different locking in the context? Please do :) The algorithm does the dependency analysis by looking at surrounding code rather than actual functional dependency. -- Thanks, Sasha