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Wed, 1 May 2024 22:02:47 +0900 (KST) Received: from [107.122.11.51] (unknown [107.122.11.51]) by epsmtip1.samsung.com (KnoxPortal) with ESMTPA id 20240501130245epsmtip112ff708b1ba8feb4c8b34c6907ecf4f4~LXwbO3r731216112161epsmtip1b; Wed, 1 May 2024 13:02:45 +0000 (GMT) Message-ID: Date: Wed, 1 May 2024 18:32:45 +0530 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.13.1 Subject: Re: [PATCH 04/10] block: avoid unpinning/freeing the bio_vec incase of cloned bio Content-Language: en-US To: Christoph Hellwig Cc: axboe@kernel.dk, martin.petersen@oracle.com, kbusch@kernel.org, brauner@kernel.org, asml.silence@gmail.com, dw@davidwei.uk, io-uring@vger.kernel.org, linux-nvme@lists.infradead.org, linux-block@vger.kernel.org, gost.dev@samsung.com, Anuj Gupta From: Kanchan Joshi In-Reply-To: <20240429170929.GB31337@lst.de> Content-Transfer-Encoding: 7bit X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFjrCJsWRmVeSWpSXmKPExsWy7bCmlm6FrVGaQe8CboumCX+ZLeas2sZo sfpuP5vF68OfGC1ezVjLZnHzwE4mi5WrjzJZvGs9x2Ix6dA1Rou9t7Qt5i97ym6x/Pg/Jgce j2szJrJ47Jx1l93j8tlSj02rOtk8Ni+p99h9s4HN4+PTWywefVtWMXp83iQXwBmVbZORmpiS WqSQmpecn5KZl26r5B0c7xxvamZgqGtoaWGupJCXmJtqq+TiE6DrlpkDdLCSQlliTilQKCCx uFhJ386mKL+0JFUhI7+4xFYptSAlp8CkQK84Mbe4NC9dLy+1xMrQwMDIFKgwITvj+7sTrAVP OCom7jvD0sD4na2LkYNDQsBEYu7qsC5GLg4hgd2MEutv/2KHcD4xSkxcvI0ZwvnGKLFvwkbG LkZOsI4Xr2awgdhCAnsZJZ5ciYEoesso8fLFMhaQBK+AncTEnm6wIhYBFYlHiw8yQ8QFJU7O fAJWIyqQLPGz6wBYjbBAjMT219PB4swC4hK3nsxnArFFBJQknr46ywiygFlgGpPE2p6pLCB3 swloSlyYXApSwymgI9F45wobRK+8xPa3c8CulhA4wyFx5fVJVoirXSSWrdgLZQtLvDq+hR3C lpJ42d8GZSdLXJp5jgnCLpF4vOcglG0v0XqqnxlkLzPQ3vW79CF28Un0/n7CBAlGXomONiGI akWJe5OeQm0Sl3g4YwmU7SHx89FEaOiuZ5LYcu0N0wRGhVlIwTILyfuzkLwzC2HzAkaWVYyS qQXFuempxaYFxnmp5fD4Ts7P3cQITs5a3jsYHz34oHeIkYmD8RCjBAezkgjvlIX6aUK8KYmV ValF+fFFpTmpxYcYTYHxM5FZSjQ5H5gf8kriDU0sDUzMzMxMLI3NDJXEeV+3zk0REkhPLEnN Tk0tSC2C6WPi4JRqYLo5+6BUqUTENcmcWP+pKmdkz+c0lGiJLBd8tXlq9hndrr+n+A69uGWo k1bOVefYcHzOjvlT/r+rumu6+ebkCVckV5aHRzpOYam95abrK20V2Cszo/TjxLu33eetXyVt rSI93zlKVvttoKjakzfCHZtiM+IuVxecVWh7ITt5a9jVmsL5Aiu6vzP/rAl3cK6YGRUuslV6 YZ54XHb2P2e7uL+XndN83vDNZrpxWpLTYkqvvpVtRdSuih+CIowT+g65vGEXf1l3xDHL23P1 2j/Ghn+22biH3noicyD//YWPB7ZOfHjrsIHoD54p2z/rHGaMLO1cH3FD7qGdY6/q74w9Dwy1 f/VZe7pLSUTvfPhMSYmlOCPRUIu5qDgRAADO+rFXBAAA X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrEIsWRmVeSWpSXmKPExsWy7bCSnG65rVGawdttOhZNE/4yW8xZtY3R YvXdfjaL14c/MVq8mrGWzeLmgZ1MFitXH2WyeNd6jsVi0qFrjBZ7b2lbzF/2lN1i+fF/TA48 HtdmTGTx2DnrLrvH5bOlHptWdbJ5bF5S77H7ZgObx8ent1g8+rasYvT4vEkugDOKyyYlNSez LLVI3y6BK+P7uxOsBU84KibuO8PSwPidrYuRk0NCwETixasZQDYXh5DAbkaJzVN2sUMkxCWa r/2AsoUlVv57zg5R9JpR4uytG8wgCV4BO4mJPd1gk1gEVCQeLT4IFReUODnzCQuILSqQLPHy z0SwQcICMRLbX08HizMDLbj1ZD4TiC0ioCTx9NVZRpAFzALTmCT6f25mhdi2nkni0pLlQB0c HGwCmhIXJpeCNHAK6Eg03rnCBjHITKJraxcjhC0vsf3tHOYJjEKzkNwxC8m+WUhaZiFpWcDI sopRMrWgODc9N9mwwDAvtVyvODG3uDQvXS85P3cTIzgatTR2MN6b/0/vECMTB+MhRgkOZiUR 3ikL9dOEeFMSK6tSi/Lji0pzUosPMUpzsCiJ8xrOmJ0iJJCeWJKanZpakFoEk2Xi4JRqYCq4 OeFNUnliAc/qq1X15xe8SefS2L63KW8pP8udmHMTHLNXaAtdC5hUwcI8cVOH2cG0pytfn1bM PHFHehXX1hUS9UGy4q4dM871yDdUL9rfY3DWtm9tyATGmtPTd+2pS3nrxhtQy6Nxbfb+BwI2 uy/Ky6neZo/o8NrlUieybHHxYnbbrX3BPCfXreQ1uhO1x3TW/7o7Lz3F9j2YFf+F7fCNe1Ub fwtYmW9ateZPt8ma/S15jm/v32maYjb7xeqEScxZcZkMPxocI1+0mnCu41ZP+WMtZTTLa03m FY8f2gvDQg/qrAwTuHfWNengHIut9v0ui2q12ZtP+F++tZu72mJKsHlF+HXP8Ov6F1sF3iqx FGckGmoxFxUnAgDCrl8xNQMAAA== X-CMS-MailID: 20240501130247epcas5p3e44f8af41cdf1767853e0f4e6985e013 X-Msg-Generator: CA Content-Type: text/plain; charset="utf-8" CMS-TYPE: 105P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20240425184658epcas5p2adb6bf01a5c56ffaac3a55ab57afaf8e References: <20240425183943.6319-1-joshi.k@samsung.com> <20240425183943.6319-5-joshi.k@samsung.com> <20240427070508.GD3873@lst.de> <03cb6ac3-595f-abb1-324b-647ed84cfe6b@samsung.com> <20240429170929.GB31337@lst.de> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240501_060258_721788_A5AB1081 X-CRM114-Status: GOOD ( 17.63 ) X-BeenThere: linux-nvme@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org On 4/29/2024 10:39 PM, Christoph Hellwig wrote: > On Mon, Apr 29, 2024 at 05:10:59PM +0530, Kanchan Joshi wrote: >>> This feels wrong. I suspect the problem is that BIP_COPY_USER is >>> inherited for clone bios while it shouldn't. >>> >> >> But BIP_COPY_USER flag is really required in the clone bio. So that we >> can copy the subset of the metadata back (from kernel bounce buffer to >> user space pinned buffer) in case of read io. >> >> Overall, copy-back will happen in installments (for each cloned bio), >> while the unpin will happen in one shot (for the source bio). > > That seems a bit odd compared to the bio data path. If you think this > is better than the version used in the data path let's convert the > data path to this scheme first to make sure we don't diverge and get > the far better testing on the main data map side. > Can you please tell what function(s) in bio data path that need this conversion? To me data path handling seems similar. Each cloned bio will lead to some amount of data transfer to pinned user-memory. The same is happening for meta transfer here.