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 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C3755C4332F for ; Sun, 17 Oct 2021 18:21:04 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 3668A61040 for ; Sun, 17 Oct 2021 18:21:04 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 3668A61040 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvack.org Received: by kanga.kvack.org (Postfix) id 650D56B006C; Sun, 17 Oct 2021 14:21:03 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 5D9F96B0072; Sun, 17 Oct 2021 14:21:03 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 47A35900002; Sun, 17 Oct 2021 14:21:03 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0146.hostedemail.com [216.40.44.146]) by kanga.kvack.org (Postfix) with ESMTP id 358D56B006C for ; Sun, 17 Oct 2021 14:21:03 -0400 (EDT) Received: from smtpin20.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id D7DB78249980 for ; Sun, 17 Oct 2021 18:21:02 +0000 (UTC) X-FDA: 78706745964.20.382AC28 Received: from mail-pl1-f172.google.com (mail-pl1-f172.google.com [209.85.214.172]) by imf11.hostedemail.com (Postfix) with ESMTP id 38043F0000AE for ; Sun, 17 Oct 2021 18:21:02 +0000 (UTC) Received: by mail-pl1-f172.google.com with SMTP id y4so9754584plb.0 for ; Sun, 17 Oct 2021 11:21:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=intel-com.20210112.gappssmtp.com; s=20210112; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=bXbtM9w7wtLoZs3T6qJjqX2Ty4EbqqViT4Y7xCCz9a0=; b=2Tgma9fVZq0U5pzB5d+36fugnRWpKAv/vv+rd8TY+x55UKPcedrr3mcNfc9HXBvbun uQlo9RXfQ+zSC64+hvaj39yB4RzfudhW8ebr5TZUjs8P6f8o/iY3/E3pBSw+FmZg9r5H yrKODUnTdxhNkmkAk/E1YHkypi6Sv3jbpIibkuVlTjnnQeieoFMENC1NLaSK2u4SlvST ec4bQfrye0G7/+vvWyyX4A1WiflmgrwjfFh+W2cGmx0+/DneG46gr0nh4gtOHwTEyWHX 64cN+swwvB62EGxeYvejuxtdCUCu6ZdwbaLZUn9QkYSKwCOSEQt5XvyOcToZImgWm8HS LudQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=bXbtM9w7wtLoZs3T6qJjqX2Ty4EbqqViT4Y7xCCz9a0=; b=dgIHNFcP0OcOqnb0ryKvjFcV/Mkjgkf6t8Fz1EkkLYiGwR+zUPe+4D1Vaa+szmiBTf 3t1P/EHk63GXVtds05bB1i8Zg5OnDS3KW6C9w29EMZrc4ZYMIl5F///WIAyOJCgVY4lt VbRcpHmg1CcasXnO1+eq84qIB4MiIW8gJfsbnO680tby29X5CLPRdVUcEH9bM9vHXeRT 7hUvHvlNa/fdm6mNIFzecOrzR88BwknkzRCSgK3MLrbERy1acJhW1JSvnL5KDWXwgQ7D BfoTGdDaqosrO9iFXzY/4F8B2xgQxfgrt/VaT3Qfb1DvRUDmSnQi302Cn4refCpHTSuf B5wQ== X-Gm-Message-State: AOAM530NdEvE8aj+V37fq1uOyvn9CAAVfM5xXcmpNkJVWUZCSWHzP28z Venrq67X+i5yMOdJlHAVwaQFPR3U12AEU+tXE/i0gQ== X-Google-Smtp-Source: ABdhPJzU8zZ6l/YLNPvyqrKueTnR9hmDhm8Moze9Nm8sl5P7aCcyYqLsiPIbKOBjjU/+LKabzjZnafwYKZQAKYl1LZI= X-Received: by 2002:a17:902:8a97:b0:13e:6e77:af59 with SMTP id p23-20020a1709028a9700b0013e6e77af59mr22550921plo.4.1634494860987; Sun, 17 Oct 2021 11:21:00 -0700 (PDT) MIME-Version: 1.0 References: <20211014153928.16805-1-alex.sierra@amd.com> <20211014153928.16805-3-alex.sierra@amd.com> <20211014170634.GV2744544@nvidia.com> <20211014230606.GZ2744544@nvidia.com> <20211016154450.GJ2744544@nvidia.com> In-Reply-To: From: Dan Williams Date: Sun, 17 Oct 2021 11:20:53 -0700 Message-ID: Subject: Re: [PATCH v1 2/2] mm: remove extra ZONE_DEVICE struct page refcount To: Matthew Wilcox Cc: Jason Gunthorpe , Alex Sierra , Andrew Morton , "Kuehling, Felix" , Linux MM , Ralph Campbell , linux-ext4 , linux-xfs , amd-gfx list , Maling list - DRI developers , Christoph Hellwig , =?UTF-8?B?SsOpcsO0bWUgR2xpc3Nl?= , Alistair Popple , Vishal Verma , Dave Jiang , Linux NVDIMM Content-Type: text/plain; charset="UTF-8" X-Stat-Signature: khcs7kmf6z9o8g9s58okhmdrzawab9p7 Authentication-Results: imf11.hostedemail.com; dkim=pass header.d=intel-com.20210112.gappssmtp.com header.s=20210112 header.b=2Tgma9fV; spf=none (imf11.hostedemail.com: domain of dan.j.williams@intel.com has no SPF policy when checking 209.85.214.172) smtp.mailfrom=dan.j.williams@intel.com; dmarc=fail reason="No valid SPF, DKIM not aligned (relaxed)" header.from=intel.com (policy=none) X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 38043F0000AE X-HE-Tag: 1634494862-403172 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Sat, Oct 16, 2021 at 9:39 AM Matthew Wilcox wrote: > > On Sat, Oct 16, 2021 at 12:44:50PM -0300, Jason Gunthorpe wrote: > > Assuming changing FSDAX is hard.. How would DAX people feel about just > > deleting the PUD/PMD support until it can be done with compound pages? > > I think there are customers who would find that an unacceptable answer :-) No, not given the number of end users that ask for help debugging PMD support.