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[142.162.113.129]) by smtp.gmail.com with ESMTPSA id a14sm9094374qtb.92.2022.02.09.06.14.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 09 Feb 2022 06:14:27 -0800 (PST) Received: from jgg by mlx with local (Exim 4.94) (envelope-from ) id 1nHnjn-001FdR-1z; Wed, 09 Feb 2022 10:14:27 -0400 Date: Wed, 9 Feb 2022 10:14:27 -0400 From: Jason Gunthorpe To: Christoph Hellwig Cc: Dan Williams , Andrew Morton , Felix Kuehling , Alex Deucher , Christian =?utf-8?B?S8O2bmln?= , "Pan, Xinhui" , Ben Skeggs , Karol Herbst , Lyude Paul , Alistair Popple , Logan Gunthorpe , Ralph Campbell , Linux Kernel Mailing List , amd-gfx list , Maling list - DRI developers , nouveau@lists.freedesktop.org, Linux NVDIMM , Linux MM Subject: Re: [PATCH 7/8] mm: remove the extra ZONE_DEVICE struct page refcount Message-ID: <20220209141427.GJ49147@ziepe.ca> References: <20220207063249.1833066-1-hch@lst.de> <20220207063249.1833066-8-hch@lst.de> <20220209062345.GB7739@lst.de> <20220209122956.GI49147@ziepe.ca> <20220209135351.GA20631@lst.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220209135351.GA20631@lst.de> X-Rspamd-Server: rspam11 X-Rspam-User: X-Stat-Signature: c46347z8jjwtjitxuros3ji8unbjzj8u Authentication-Results: imf22.hostedemail.com; dkim=pass header.d=ziepe.ca header.s=google header.b=V7onSa8r; dmarc=none; spf=pass (imf22.hostedemail.com: domain of jgg@ziepe.ca designates 209.85.222.169 as permitted sender) smtp.mailfrom=jgg@ziepe.ca X-Rspamd-Queue-Id: E4EB3C0003 X-HE-Tag: 1644416068-727271 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 Wed, Feb 09, 2022 at 02:53:51PM +0100, Christoph Hellwig wrote: > On Wed, Feb 09, 2022 at 08:29:56AM -0400, Jason Gunthorpe wrote: > > It is nice, but the other series are still impacted by the fsdax mess > > - they still stuff pages into ptes without proper refcounts and have > > to carry nonsense to dance around this problem. > > > > I certainly would be unhappy if the amd driver, for instance, gained > > the fsdax problem as well and started pushing 4k pages into PMDs. > > As said before: I think this all needs to be fixed. But I'd rather > fix it gradually and I think this series is a nice step forward. > After that we can look at the pte mappings. Right, I agree with this Jason