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=-5.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 C8DAFC433FE for ; Tue, 8 Dec 2020 20:46:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 91B7D222F9 for ; Tue, 8 Dec 2020 20:46:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729829AbgLHUqQ (ORCPT ); Tue, 8 Dec 2020 15:46:16 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41866 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726104AbgLHUqQ (ORCPT ); Tue, 8 Dec 2020 15:46:16 -0500 Received: from mail-wr1-x441.google.com (mail-wr1-x441.google.com [IPv6:2a00:1450:4864:20::441]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D66CBC061793 for ; Tue, 8 Dec 2020 12:45:35 -0800 (PST) Received: by mail-wr1-x441.google.com with SMTP id a12so10819912wrv.8 for ; Tue, 08 Dec 2020 12:45:35 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=fRNFKtChjq2P9zZPFMG3JUrl4JmCeOXYmonD/57lU9k=; b=hiDQD5cLQpdIKh3uMG64fowgcYfUc6YbH6tg/zLJZLM+/tbhqmnB1Q4u2MqqgIh5Hk LI6VUKmcpRJh3STxgUirRcWG9Uzs00BQrSCbr2tbGrZhJKCRbyhCpZbDG9YeHc4lFdpg +YuPwd/DRZyUfofAUmY/lhI20/mBDzy04eyWc= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=fRNFKtChjq2P9zZPFMG3JUrl4JmCeOXYmonD/57lU9k=; b=GDmHboAY7sIc8tfWz/Kl39p8zcCpD251rCDTBe8vOfGk3LF/eTiOxos//0voJok3Tv wO1yiTV4QyDvpRkk42V3myNY+1/vGuJRcPq1yY/bgFt8mcnKXFKAXkjPVZH+1K/9+K75 G6moleUWPt8l0/I119M75pH6F8Ch0KprDkhTSzC20cp4lMpIIu/VMYeiMQ3W9P/35HSk NIESzT0VGZzYZVtjMKv5/kZm6u0eC6ufGRugutpuZqjaS5i6T4DU6IKyNJZLRtkeCV3n K+ARlkVHNY03yw3Ij+eC/AVOp0BBTrMd4osPbe1md0tTGUhXTo/uTDF9I+CLjOqZM3MD kt6w== X-Gm-Message-State: AOAM532AQkuW9VLdlHzN+GcglgPWXb8U/Ian4lYwzN5s7A9bVLVSUJ1e eGD0ncONiMlnkOh1vja0kgF39gFjPISZTw== X-Google-Smtp-Source: ABdhPJyWP9lK6BpRNG4xZRdMgB/pdHOnFvl/Cp+wbF5UDn+T65RTWzQTmBvsFS56E+FjJFFXgtSFgg== X-Received: by 2002:a17:907:1004:: with SMTP id ox4mr24065069ejb.240.1607453088371; Tue, 08 Dec 2020 10:44:48 -0800 (PST) Received: from mail-wr1-f51.google.com (mail-wr1-f51.google.com. [209.85.221.51]) by smtp.gmail.com with ESMTPSA id ak17sm2631285ejc.103.2020.12.08.10.44.47 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 08 Dec 2020 10:44:47 -0800 (PST) Received: by mail-wr1-f51.google.com with SMTP id r3so17316320wrt.2 for ; Tue, 08 Dec 2020 10:44:47 -0800 (PST) X-Received: by 2002:a2e:8995:: with SMTP id c21mr3217172lji.251.1607452656546; Tue, 08 Dec 2020 10:37:36 -0800 (PST) MIME-Version: 1.0 References: <87tut2bqik.fsf@x220.int.ebiederm.org> <87ft4mbqen.fsf@x220.int.ebiederm.org> <875z5h4b7a.fsf@x220.int.ebiederm.org> <20201207090953.GF3040@hirez.programming.kicks-ass.net> <20201208083412.GR2414@hirez.programming.kicks-ass.net> In-Reply-To: <20201208083412.GR2414@hirez.programming.kicks-ass.net> From: Linus Torvalds Date: Tue, 8 Dec 2020 10:37:20 -0800 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH] perf: Break deadlock involving exec_update_mutex To: Peter Zijlstra Cc: Bernd Edlinger , "Eric W. Biederman" , Linux Kernel Mailing List , Ingo Molnar , Will Deacon , Jann Horn , Vasiliy Kulikov , Al Viro , Oleg Nesterov , Cyrill Gorcunov , Sargun Dhillon , Christian Brauner , Arnd Bergmann , Arnaldo Carvalho de Melo , Waiman Long , Davidlohr Bueso Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Dec 8, 2020 at 12:34 AM Peter Zijlstra wrote: > > I suppose I'll queue the below into tip/perf/core for next merge window, > unless you want it in a hurry? LGTM, and there's no hurry. This is not a new thing, and I don't think it has been a problem in practice. Linus