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=1.5 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, FSL_HELO_FAKE,MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_MUTT 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 74DA7C04EB8 for ; Tue, 4 Dec 2018 09:02:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 303DD2146D for ; Tue, 4 Dec 2018 09:02:35 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="ADCN68sX" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 303DD2146D Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725862AbeLDJCe (ORCPT ); Tue, 4 Dec 2018 04:02:34 -0500 Received: from mail-wr1-f66.google.com ([209.85.221.66]:35985 "EHLO mail-wr1-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725613AbeLDJCd (ORCPT ); Tue, 4 Dec 2018 04:02:33 -0500 Received: by mail-wr1-f66.google.com with SMTP id u3so15004121wrs.3 for ; Tue, 04 Dec 2018 01:02:32 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=djTzPzGyrZiEHxmAlWU5eT5nDI4Ncu8dwRdabVKYnKA=; b=ADCN68sXDPMjSrE+pQtTfYPv59b7ZgDJ3gVY6Fsk5tWjz9Zc/fMcTi8U1Aw6DLt6vE P/uJHTchmSoDEPDPeu2PCYf+x7pzcBV+ZHsqUkK35U4hwnazvtSa7A1d7fL42myjBJOQ NvE07ChhbKANj1LAMCZ0S3exsLXZJ88FyCOHioLmXNKSH1/tJ7tMqFoZfcm/d+s7EuTU xihT49HpfmXYJr/97uZYgigrQDWMhVLInwlAxbWwr6dBUyQoClSH0/zBauNvHBUv48Nt nHA6Z8Ycrzqeb+6BNpTRskamNyBh/boSGCSGFA9v8VGkYaXuNZ1NVzsrtqxOtT6arLjr l6Xw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:from:to:cc:subject:message-id :references:mime-version:content-disposition:in-reply-to:user-agent; bh=djTzPzGyrZiEHxmAlWU5eT5nDI4Ncu8dwRdabVKYnKA=; b=CQe8NaEDxBZ6cT2u+HaeHtvfSzuDqqJbscIepLE2LODTs+EtydYXMKc3u0yKVAshJq bm3j/QUi9C5/oeuSB8dsrjPmJxL2vWvfw13VR57WgWG/pbGvwxSBQUfU0JkRLNLX4mFc uXpJSIOJNFthoyxrSn0/uAfJMgwrupC431yMKxltmU8uF7Kinr+chGmdCnrz+xvuINI3 zjQZZf4t1OjlkKFHDwWV2o22ksjUrTvxElVKiWZnns3joTqMDvtG3MNnPRgRFL9FFXpx yVRftlRazr3BA7O31Gs3I0vWn1Fx0UyQfUIqPMKH6r9dfrKSR1hM/kP8ny353BKz4Ctf E6pw== X-Gm-Message-State: AA+aEWb0L/yZmjq7rQsPoAC3E+vlzXOk0w146qBOvykt16yF9nx2eRCP PArzBFny9if2j6QMb2Vg7Ic= X-Google-Smtp-Source: AFSGD/V3EjZ/aPRg1UAgG0yAGuvqQwyA23Lf1TrN7GMR3KViEe5w3hqE6wEuiDz9HJO2KlbuudqrWA== X-Received: by 2002:a5d:4652:: with SMTP id j18mr17641464wrs.279.1543914151856; Tue, 04 Dec 2018 01:02:31 -0800 (PST) Received: from gmail.com (2E8B0CD5.catv.pool.telekom.hu. [46.139.12.213]) by smtp.gmail.com with ESMTPSA id b7sm12943741wrs.47.2018.12.04.01.02.30 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Tue, 04 Dec 2018 01:02:31 -0800 (PST) Date: Tue, 4 Dec 2018 10:02:28 +0100 From: Ingo Molnar To: Michal Hocko Cc: Pavel Machek , Oleg Nesterov , Linus Torvalds , Linux List Kernel Mailing , "Rafael J. Wysocki" , Chanho Min , Thomas Gleixner , Peter Zijlstra Subject: Re: [PATCH] Revert "exec: make de_thread() freezable (was: Re: Linux 4.20-rc4) Message-ID: <20181204090228.GC73770@gmail.com> References: <20181203074700.GA21240@gmail.com> <20181203083942.GF31738@dhcp22.suse.cz> <20181203123149.GB31795@redhat.com> <20181203123857.GS31738@dhcp22.suse.cz> <20181203131006.GA10054@amd> <20181203135351.GU31738@dhcp22.suse.cz> <20181203141459.GA14789@amd> <20181203141737.GY31738@dhcp22.suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20181203141737.GY31738@dhcp22.suse.cz> 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 * Michal Hocko wrote: > > Do we actually have reports of this happening for people outside > > Android? > > Not that I am aware of. I'd say outside of Android 99% of the use of hibernation is the fail-safe that distributions offer on laptops with very low battery levels: the emergency hibernation when there's almost no power left anymore. Do these hibernation failure messages typically make it to persistent logs before the system uses power? In practice if that is buggy the kernel won't hibernate and the laptop will run out of power and the user will conclude "ugh, I shouldn't have left my laptop turned on" - without looking into the logs and reporting, as they'll perceive it as a user failure not a system failure. I certainly saw random Linux laptops fail to hibernate over the years and didn't report it, so if the distribution doesn't do the reporting automatically then chances are we'll never see it. Thanks, Ingo