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=-2.1 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,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 D43CFC7618F for ; Mon, 15 Jul 2019 13:23:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A653D2067C for ; Mon, 15 Jul 2019 13:23:07 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="VRX6bsGY" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730258AbfGONXD (ORCPT ); Mon, 15 Jul 2019 09:23:03 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:33784 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730071AbfGONXB (ORCPT ); Mon, 15 Jul 2019 09:23:01 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=yQyxE1Ka8nS34umw3hpmbSbzTCZ5gJ0CQHD8yI5d4wk=; b=VRX6bsGYqh416y4aHeiEW2HRR 6U+RV1QBT3iWnePTvztjbiwJ6Dw1g4V6gbHjzBquAlktAysb5xe8Elj+DFs/+zggxWT4mL7Sm2Ri5 fHm4Q3muM/TT7s8uHEZfI70HDeRCRWYEzUCENr9fMWYdA63nqnjrRWx91eXlxaIDQNTzqW9m0MR8H PiPSxpcQBnL8UqCTkAi8AkD1LfO+EmBF6e28iKnYFl/NiGMmIAAw8YDMqedVqmBPUk4LzAP78wZZL 831kS76LQRdcs4aLioKEbymcdcm/qRxDfp5LLGAk6VxfPdhX05NjUDTegHXjehwZmYDinafYHbHD5 g/l0dv4DQ==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=hirez.programming.kicks-ass.net) by bombadil.infradead.org with esmtpsa (Exim 4.92 #3 (Red Hat Linux)) id 1hn0wO-0006PM-LJ; Mon, 15 Jul 2019 13:22:52 +0000 Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id E508120A7A4EF; Mon, 15 Jul 2019 15:22:50 +0200 (CEST) Date: Mon, 15 Jul 2019 15:22:50 +0200 From: Peter Zijlstra To: "Paul E. McKenney" Cc: Theodore Ts'o , Dmitry Vyukov , syzbot , Andreas Dilger , David Miller , eladr@mellanox.com, Ido Schimmel , Jiri Pirko , John Stultz , linux-ext4@vger.kernel.org, LKML , netdev , syzkaller-bugs , Thomas Gleixner , Ingo Molnar Subject: Re: INFO: rcu detected stall in ext4_write_checks Message-ID: <20190715132250.GF3419@hirez.programming.kicks-ass.net> References: <20190626224709.GH3116@mit.edu> <20190705151658.GP26519@linux.ibm.com> <20190705191055.GT26519@linux.ibm.com> <20190706042801.GD11665@mit.edu> <20190706061631.GV26519@linux.ibm.com> <20190706150226.GG11665@mit.edu> <20190706180311.GW26519@linux.ibm.com> <20190707011655.GA22081@linux.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190707011655.GA22081@linux.ibm.com> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org On Sat, Jul 06, 2019 at 06:16:55PM -0700, Paul E. McKenney wrote: > 4. SCHED_DEADLINE treats the other three scheduling classes as each > having a period, deadline, and a modest CPU consumption budget > for the members of the class in aggregate. But this has to have > been discussed before. How did that go? Yeah; this has been proposed a number of times; and I think everybody agrees that it is a good idea, but nobody has so far sat down and wrote the patches. Or rather; we would've gotten this for 'free' with the rt-cgroup rewrite, but that's been stuck forever due to affinity being difficult.