From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf1-f197.google.com (mail-pf1-f197.google.com [209.85.210.197]) by kanga.kvack.org (Postfix) with ESMTP id B93CE6B04D8 for ; Tue, 30 Oct 2018 04:18:00 -0400 (EDT) Received: by mail-pf1-f197.google.com with SMTP id g63-v6so9843170pfc.9 for ; Tue, 30 Oct 2018 01:18:00 -0700 (PDT) Received: from mx1.suse.de (mx2.suse.de. [195.135.220.15]) by mx.google.com with ESMTPS id e11-v6si24264030pln.21.2018.10.30.01.17.59 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 30 Oct 2018 01:17:59 -0700 (PDT) Date: Tue, 30 Oct 2018 09:17:57 +0100 From: Michal Hocko Subject: Re: [PATCH v5 4/4] mm: Defer ZONE_DEVICE page initialization to the point where we init pgmap Message-ID: <20181030081757.GX32673@dhcp22.suse.cz> References: <20181029141210.GJ32673@dhcp22.suse.cz> <84f09883c16608ddd2ba88103f43ec6a1c649e97.camel@linux.intel.com> <20181029163528.GL32673@dhcp22.suse.cz> <18dfc5a0db11650ff31433311da32c95e19944d9.camel@linux.intel.com> <20181029172415.GM32673@dhcp22.suse.cz> <8e7a4311a240b241822945c0bb4095c9ffe5a14d.camel@linux.intel.com> <20181029181827.GO32673@dhcp22.suse.cz> <3281f3044fa231bbc1b02d5c5efca3502a0d05a8.camel@linux.intel.com> <20181030062915.GT32673@dhcp22.suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: owner-linux-mm@kvack.org List-ID: To: Dan Williams Cc: alexander.h.duyck@linux.intel.com, Linux MM , Andrew Morton , Linux Kernel Mailing List , linux-nvdimm , Pasha Tatashin , Dave Hansen , =?iso-8859-1?B?Suly9G1l?= Glisse , rppt@linux.vnet.ibm.com, Ingo Molnar , "Kirill A. Shutemov" , Zhang Yi , osalvador@techadventures.net On Mon 29-10-18 23:55:12, Dan Williams wrote: > On Mon, Oct 29, 2018 at 11:29 PM Michal Hocko wrote: > > > > On Mon 29-10-18 12:59:11, Alexander Duyck wrote: > > > On Mon, 2018-10-29 at 19:18 +0100, Michal Hocko wrote: > [..] > > > The patches Andrew pushed addressed the immediate issue so that now > > > systems with nvdimm/DAX memory can at least initialize quick enough > > > that systemd doesn't refuse to mount the root file system due to a > > > timeout. > > > > This is about the first time you actually mention that. I have re-read > > the cover letter and all changelogs of patches in this serious. Unless I > > have missed something there is nothing about real users hitting issues > > out there. nvdimm is still considered a toy because there is no real HW > > users can play with. > > Yes, you have missed something, because that's incorrect. There's been > public articles about these parts sampling since May. > > https://www.anandtech.com/show/12828/intel-launches-optane-dimms-up-to-512gb-apache-pass-is-here indeed! > That testing identified this initialization performance problem and > thankfully got it addressed in time for the current merge window. And I still cannot see a word about that in changelogs. -- Michal Hocko SUSE Labs