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=-5.8 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 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 141D8C433E0 for ; Mon, 8 Feb 2021 12:19:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BBB0E64E3B for ; Mon, 8 Feb 2021 12:19:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231443AbhBHMTK (ORCPT ); Mon, 8 Feb 2021 07:19:10 -0500 Received: from mx2.suse.de ([195.135.220.15]:57490 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232876AbhBHMSN (ORCPT ); Mon, 8 Feb 2021 07:18:13 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1612786646; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=n+2LVFofWrDzo5XkXIbA8HqM46aC4ZldghhZ33psn6M=; b=KSPyq7HV9X52hHkw5B3fAQ6GHHyEdJ7l95EmFctR048cvtpwwEJSzUjnHCHT2EQT2m1fwI Jsts1jfz6j4PUcL+oOZWQPNH0wYw5qJxQghfmFs/AJ9ffQiRDEhRFqPxBNTbqXBqUQzMJN tTTWa45AKjgqUKiY3BBR4wSnVehy4C8= Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 268A7AC6E; Mon, 8 Feb 2021 12:17:26 +0000 (UTC) Date: Mon, 8 Feb 2021 13:17:24 +0100 From: Michal Hocko To: David Hildenbrand Cc: Mike Rapoport , Andrew Morton , Alexander Viro , Andy Lutomirski , Arnd Bergmann , Borislav Petkov , Catalin Marinas , Christopher Lameter , Dan Williams , Dave Hansen , Elena Reshetova , "H. Peter Anvin" , Ingo Molnar , James Bottomley , "Kirill A. Shutemov" , Matthew Wilcox , Mark Rutland , Mike Rapoport , Michael Kerrisk , Palmer Dabbelt , Paul Walmsley , Peter Zijlstra , Rick Edgecombe , Roman Gushchin , Shakeel Butt , Shuah Khan , Thomas Gleixner , Tycho Andersen , Will Deacon , linux-api@vger.kernel.org, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-nvdimm@lists.01.org, linux-riscv@lists.infradead.org, x86@kernel.org, Hagen Paul Pfeifer , Palmer Dabbelt Subject: Re: [PATCH v17 08/10] PM: hibernate: disable when there are active secretmem users Message-ID: References: <20210208084920.2884-1-rppt@kernel.org> <20210208084920.2884-9-rppt@kernel.org> <38c0cad4-ac55-28e4-81c6-4e0414f0620a@redhat.com> <770690dc-634a-78dd-0772-3aba1a3beba8@redhat.com> <21f4e742-1aab-f8ba-f0e7-40faa6d6c0bb@redhat.com> <5db6ac46-d4e1-3c68-22a0-94f2ecde8801@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <5db6ac46-d4e1-3c68-22a0-94f2ecde8801@redhat.com> Precedence: bulk List-ID: X-Mailing-List: linux-api@vger.kernel.org On Mon 08-02-21 12:26:31, David Hildenbrand wrote: [...] > My F33 system happily hibernates to disk, even with an application that > succeeded in din doing an mlockall(). > > And it somewhat makes sense. Even my freshly-booted, idle F33 has > > $ cat /proc/meminfo | grep lock > Mlocked: 4860 kB > > So, stopping to hibernate with mlocked memory would essentially prohibit any > modern Linux distro to hibernate ever. My system seems to be completely fine without mlocked memory. It would be interesting to see who mlocks memory on your system and check whether the expectated mlock semantic really works for those. This should be documented at least. -- Michal Hocko SUSE Labs