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Fri, 12 Nov 2021 07:40:14 -0800 (PST) Received: from jgg by mlx with local (Exim 4.94) (envelope-from ) id 1mlYez-00975w-1c; Fri, 12 Nov 2021 11:40:13 -0400 Date: Fri, 12 Nov 2021 11:40:13 -0400 From: Jason Gunthorpe To: Joao Martins Cc: linux-mm@kvack.org, Dan Williams , Vishal Verma , Dave Jiang , Naoya Horiguchi , Matthew Wilcox , John Hubbard , Jane Chu , Muchun Song , Mike Kravetz , Andrew Morton , Jonathan Corbet , Christoph Hellwig , nvdimm@lists.linux.dev, linux-doc@vger.kernel.org Subject: Re: [PATCH v5 0/8] mm, dax: Introduce compound pages in devmap Message-ID: <20211112154013.GE876299@ziepe.ca> References: <20211112150824.11028-1-joao.m.martins@oracle.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20211112150824.11028-1-joao.m.martins@oracle.com> X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: EBEAE190C X-Stat-Signature: dpgbtsqg6bdydb65zmwqq9ma3s4onhbm Authentication-Results: imf22.hostedemail.com; dkim=pass header.d=ziepe.ca header.s=google header.b="YNrl8o8/"; dmarc=none; spf=pass (imf22.hostedemail.com: domain of jgg@ziepe.ca designates 209.85.219.48 as permitted sender) smtp.mailfrom=jgg@ziepe.ca X-HE-Tag: 1636731614-664827 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 Fri, Nov 12, 2021 at 04:08:16PM +0100, Joao Martins wrote: > This series converts device-dax to use compound pages, and moves away from the > 'struct page per basepage on PMD/PUD' that is done today. Doing so, unlocks a > few noticeable improvements on unpin_user_pages() and makes device-dax+altmap case > 4x times faster in pinning (numbers below and in last patch). I like it - aside from performance this series is important to clean up the ZONE_DEVICE refcounting mess as it means that only fsdax will be installing tail pages as PMD entries. Thanks, Jason