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b=pXfr6iukpFNitgAKIIVSyCYtDDCh3B1GaWuseUbNm4XLfuvHiPNIEI1RqzgXGCn+r T8x3ffU9NvEGqhEZOlcisSCjWlq5PsrCdXVG8sEw7pR+jCveH56xttouEjDQJDV8WY bx5SFdkmU/eJH7Hrzmkv07xrrIzZ4Y8X8n46X7ryPLmoTBBwUTYHLhLxEw9x3XHUY1 Sze57dE6qj3rdN/EwuSVQ8/g13tIxT1HqDmg5aZ6q77NA2Bid5WHDDtaexWJgT2Sgx tKYkFMMAg8RNVBv4t74ApVds33Nr2L4PoRFdOrDOZnsgk8sPPHU+TQP6pn8GBLAoZx 12xZsB0TjAqdA== Date: Mon, 28 Oct 2024 08:46:34 +0200 From: Leon Romanovsky To: Srinivasulu Thanneeru Cc: Jens Axboe , Jason Gunthorpe , Robin Murphy , Joerg Roedel , Will Deacon , Christoph Hellwig , Sagi Grimberg , Keith Busch , Bjorn Helgaas , Logan Gunthorpe , Yishai Hadas , Shameer Kolothum , Kevin Tian , Alex Williamson , Marek Szyprowski , =?iso-8859-1?B?Suly9G1l?= Glisse , Andrew Morton , Jonathan Corbet , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-block@vger.kernel.org, linux-rdma@vger.kernel.org, iommu@lists.linux.dev, linux-nvme@lists.infradead.org, linux-pci@vger.kernel.org, kvm@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH 05/18] dma: Provide an interface to allow allocate IOVA Message-ID: <20241028064634.GE1615717@unreal> References: <844f3dcf9c341b8178bfbc90909ef13d11dd2193.1730037276.git.leon@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: X-Rspam-User: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 9F2AA4000E X-Stat-Signature: sctx1e4hwrwyt6fi9958wjdehw7ncjfg X-HE-Tag: 1730097981-75584 X-HE-Meta: U2FsdGVkX1/HG0OmV1ZgWm78FET3s7HvQSC6/3Xi+YgLpvNoqCq/BPbeEqKnm/0CLU7tp7M63FYaOS5TVUJ6uAYaazl7hIzA2BHOkOyDfJFvE7xAbNVcYdZ9i1fyQP5j85sm1FMwYCujkz+Ss0IMAdlpypY2FSfdKOoWtjtQvI8GApCgCXutxMo4nl6wQ6CTvnqnYyjZk8gAUvHivn4qMQ3+dH8DTUDAcFYF95VSPXPev8XLABC3PZnWL04v7DU9XLg6sOlbqAkequU4+Dh/OqFHe4nfXME0HOkuuAdaj6jNaM4Qg6I9SVTocqyM3l+cGvu3InfdQe5VoLMbLfb3gGzNOUNUkzvl4UHYzGTnTXMSnj4tO0DJUbuAZDApHsQk2sLbnzLZbMRCbBFhBzo+iee8/vdNUEj97fKm3GfKFnzyu+a9m7+yJsaAyP5HvB9SbIvuq4wkpKkL7MHZfYcHEXBc4g17nTC7/kR1LVFDFYXZIL9Nd0JMRQUq1ooWJpI2nJ8w26EJVc0EoB/qFZ9CELc3sPlaRMdH1DvtX7McXAGX5UNBSi47xoTzJr5OL0HEt6sf/EpQqJIzHyVguiYBLiMyAyl20JifoABpGNWWLf7aNoxGJBpWsT7R9xDjLBal3MBkTNo9r9EgNPDUaxx31rO+q8sHQDMvVovEHEo4BWUkMBx5d9FZTucr1fczW18Ogi6OAAdlcAi5mEWL1DCThHK/09O8uhfreUwuwIGjUE/EX6oNvZ2sUYTT2TL68lrDHUCfIUa65o74R+zVigctKkuuzdPcmGzjCQ9DA6wE239JcJ8Sfep1vZZPFhXw1P8z2qJPu0P36LcL7V9qwXpSzx3SLTmDVTZ3xEY1pMay7wNPXT1yrI35QXGWF073vS23h41hkLh/EQu0bhdzsFVI/yDUzszfFmFLJAluzMfppAzzm45hyKWtxu6jFMT9lo2eDtRtuQ8BzvZrdleinfZ rUZehYcE sIk+gYAs3bLonnqumNZ69F/fwecNEOK1xkeJgGk27aJRPCnIBPQCsnOiEbl+f0hJROhXD5WsGCZHbrXnhI/KU0oRPU36eB/Mh4fg1qRwYiDZG+yk3O0in2YBM41bAdjLI2RVG8lomjL0as4iQ07+ooy94NUC2y2KUZTsj57yPxM/K1r8R3g4GyW7L9HfmZB4tqt/FsCdLUw02tOBFGahTbCNaOFtoa9T2T2zIjpUDFqhce93DmWk8sNmsi8LV3+RyKTO4MRbZWLx6zjqbwMMKp7gLp9Qf4KNIeYOX4aDiRce9Kfelrda9qJN/YKWCQs6xmW5fkvvKPgqtLKR2VJqbEFQ7r3r/QYhOZtwZ9RA6QaS3XLLXpqR9bunxHk50C4kqiceFr+EoRbuZ/pg= 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: List-Subscribe: List-Unsubscribe: On Mon, Oct 28, 2024 at 09:54:49AM +0530, Srinivasulu Thanneeru wrote: > On Sun, Oct 27, 2024 at 10:23 PM Leon Romanovsky wrote: > > > > From: Leon Romanovsky > > > > The existing .map_page() callback provides both allocating of IOVA > > and linking DMA pages. That combination works great for most of the > > callers who use it in control paths, but is less effective in fast > > paths where there may be multiple calls to map_page(). > > Can you please share perf stats with this patch in fast path, if available? I don't have this data for HMM and VFIO as they have other benefits from this series except performance. For NVMe, I don't have the data yet, but it will come https://lore.kernel.org/all/cover.1730037261.git.leon@kernel.org/, as it is the main performant user of this API. This is the main reason why NVMe series is marked as RFC yet. Thanks