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Fri, 30 Sep 2022 17:45:15 -0700 (PDT) Received: from [10.225.163.96] (unknown [10.225.163.96]) by usg-ed-osssrv.wdc.com (Postfix) with ESMTPSA id 4MfT076V2Xz1RvLy; Fri, 30 Sep 2022 17:45:11 -0700 (PDT) Message-ID: Date: Sat, 1 Oct 2022 09:45:10 +0900 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.3.0 Subject: Re: [PATCH v15 00/13] support zoned block devices with non-power-of-2 zone sizes Content-Language: en-US To: Bart Van Assche , Jens Axboe , Pankaj Raghav , hch@lst.de, Keith Busch Cc: jaegeuk@kernel.org, agk@redhat.com, gost.dev@samsung.com, snitzer@kernel.org, linux-kernel@vger.kernel.org, hare@suse.de, matias.bjorling@wdc.com, Johannes.Thumshirn@wdc.com, linux-block@vger.kernel.org, linux-nvme@lists.infradead.org, pankydev8@gmail.com, dm-devel@redhat.com, "Martin K. Petersen" References: <20220923173618.6899-1-p.raghav@samsung.com> <5e9d678f-ffea-e015-53d8-7e80f3deda1e@samsung.com> <0e5088a5-5408-c5bd-bf97-00803cb5faed@acm.org> From: Damien Le Moal Organization: Western Digital Research In-Reply-To: <0e5088a5-5408-c5bd-bf97-00803cb5faed@acm.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220930_174520_551446_A405C0EF X-CRM114-Status: GOOD ( 23.02 ) 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 10/1/22 04:38, Bart Van Assche wrote: > On 9/30/22 08:13, Jens Axboe wrote: >> On 9/29/22 12:31 AM, Pankaj Raghav wrote: >>>> Hi Jens, >>>> Please consider this patch series for the 6.1 release. >>>> >>> >>> Hi Jens, Christoph, and Keith, >>> All the patches have a Reviewed-by tag at this point. Can we queue this up >>> for 6.1? >> >> It's getting pretty late for 6.1 and I'd really like to have both Christoph >> and Martin sign off on these changes. > > Hi Jens, > > Agreed that it's getting late for 6.1. > > Since this has not been mentioned in the cover letter, I want to add > that in the near future we will need these patches for Android devices. > JEDEC is working on supporting zoned storage for UFS devices, the > storage devices used in all modern Android phones. Although it would be > possible to make the offset between zone starts a power of two by > inserting gap zones between data zones, UFS vendors asked not to do this > and hence need support for zone sizes that are not a power of two. An > advantage of not having to deal with gap zones is better filesystem > performance since filesystem extents cannot span gap zones. Having to > split filesystem extents because of gap zones reduces filesystem > performance. As mentioned many times, my opinion is that a good implementation should *not* have any extent span zone boundaries. So personally, I do not consider such argument as a valid justification for the non-power-of-2 zone size support. > > Thanks, > > Bart. > > -- Damien Le Moal Western Digital Research