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[209.132.180.67]) by mx.google.com with ESMTP id j3-v6si22108957pld.231.2018.10.29.23.57.32; Mon, 29 Oct 2018 23:57:47 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@intel-com.20150623.gappssmtp.com header.s=20150623 header.b=JFD1xXFB; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=intel.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727317AbeJ3Prj (ORCPT + 99 others); Tue, 30 Oct 2018 11:47:39 -0400 Received: from mail-ot1-f68.google.com ([209.85.210.68]:43079 "EHLO mail-ot1-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726154AbeJ3Prj (ORCPT ); Tue, 30 Oct 2018 11:47:39 -0400 Received: by mail-ot1-f68.google.com with SMTP id k9so10062468otl.10 for ; Mon, 29 Oct 2018 23:55:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=intel-com.20150623.gappssmtp.com; s=20150623; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=2oEctViFWGv5eMUDxpWzydSoGJaeA2ZN4aB61tX/MeE=; b=JFD1xXFBNKZ6cX0yIR1rE38RC1OfSF80xEszztaMuH0K5TsxAsdg/CnuAiSKwhdrXE QemGK8CIzrR62rXk9yZTPz2O2B618r/9VujQfAwmvCRYaS0MvLwVk2f1AVORD4LrEdgT ubmbjXIBPTymxE1Thw6PpXWKRh0ZXR3Db0HgB/Ws3OohN/88FBqsI0KGIp49QGp+1/Pw ko7ekHYdIPQVOQ1PJ2jvlLdhkNccyw/OROPfA4P9dMtykWhjB5VyMnCFtgj+wQ0hngf5 MC67ImwrQBNtS3W9zV2N6m5kSCtkmGpHT9a8lQlI/69ZK8XCfQWR6ECUMKy5WtXQu3Rh 0LDg== 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=2oEctViFWGv5eMUDxpWzydSoGJaeA2ZN4aB61tX/MeE=; b=TIMOxuAAbFmvLDAKJMbWtF6DB3UzmzGMlYhL/TsCtkxUHlwX5cia6TP1Y2ordQxvtg Y903EDUY1Us9ywEtA5G0sJaP+lhvmQNr2AAlHZomIvcWkFKyjWhOwGyHiE1Pq+O+9q+x lOhiZMRpyjOD06uX+QuwQsrYPewcjWEvZ9yUmCZfcAHpYFrX81qbIfU0S5gXkcLq1Yyq RVYXq/jL2yeKzxT3R8O8SxSZ7K9fYvOvZuyZ1c5lUm1811cdt4YlOxSdrzwZ33R4K7mF 6Q6TFSMLSFkI+zXvq6og6z/jDlxdcUut4Jo92DBoQlf9bzJ7cn8oTq3yhcZo2ZBiBm9J PgXQ== X-Gm-Message-State: AGRZ1gJQ2mdUoLotoeCb16NT7rvXnIt7AkST0SAfzTiZto5wZPHSaZDv c/u1R/KWhFusDIos2UsnLWeVhi9Gluykm8MQ2gdy9w== X-Received: by 2002:a9d:9c4:: with SMTP id 4mr5421953otz.214.1540882523764; Mon, 29 Oct 2018 23:55:23 -0700 (PDT) MIME-Version: 1.0 References: <20181017075257.GF18839@dhcp22.suse.cz> <971729e6-bcfe-a386-361b-d662951e69a7@linux.intel.com> <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> In-Reply-To: <20181030062915.GT32673@dhcp22.suse.cz> From: Dan Williams Date: Mon, 29 Oct 2018 23:55:12 -0700 Message-ID: Subject: Re: [PATCH v5 4/4] mm: Defer ZONE_DEVICE page initialization to the point where we init pgmap To: Michal Hocko Cc: alexander.h.duyck@linux.intel.com, Linux MM , Andrew Morton , Linux Kernel Mailing List , linux-nvdimm , Pasha Tatashin , Dave Hansen , =?UTF-8?B?SsOpcsO0bWUgR2xpc3Nl?= , rppt@linux.vnet.ibm.com, Ingo Molnar , "Kirill A. Shutemov" , Zhang Yi , osalvador@techadventures.net Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 That testing identified this initialization performance problem and thankfully got it addressed in time for the current merge window.