From: Jens Axboe <axboe@kernel.dk>
To: Bart Van Assche <bvanassche@acm.org>
Cc: linux-block@vger.kernel.org, linux-scsi@vger.kernel.org,
Jaegeuk Kim <jaegeuk@kernel.org>,
Avri Altman <avri.altman@wdc.com>,
Adrian Hunter <adrian.hunter@intel.com>,
Christoph Hellwig <hch@lst.de>, Ming Lei <ming.lei@redhat.com>
Subject: Re: [PATCH v3 0/9] Add support for segments smaller than one page
Date: Wed, 18 Jan 2023 18:18:54 -0700 [thread overview]
Message-ID: <52073ee8-72ab-f424-1738-c56bc8d5cd67@kernel.dk> (raw)
In-Reply-To: <20230118225447.2809787-1-bvanassche@acm.org>
On 1/18/23 3:54?PM, Bart Van Assche wrote:
> Hi Jens,
>
> Several embedded storage controllers need support for DMA segments that are
> smaller than the size of one virtual memory page. Hence this patch series.
> Please consider this patch series for the next merge window.
Before any real reviews are done, I have to ask "why?". This is pretty
hairy code in the middle of the fast path for some obscure controller.
Why would anyone ship that with > 4k page sizes rather than ship it with
a controller that is sane?
--
Jens Axboe
next prev parent reply other threads:[~2023-01-19 1:24 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-18 22:54 [PATCH v3 0/9] Add support for segments smaller than one page Bart Van Assche
2023-01-18 22:54 ` [PATCH v3 1/9] block: Introduce QUEUE_FLAG_SUB_PAGE_SEGMENTS and CONFIG_BLK_SUB_PAGE_SEGMENTS Bart Van Assche
2023-01-18 23:02 ` Jens Axboe
2023-01-18 23:40 ` Bart Van Assche
2023-01-21 0:11 ` Bart Van Assche
2023-01-21 2:43 ` Jens Axboe
2023-01-23 19:58 ` Bart Van Assche
2023-01-18 22:54 ` [PATCH v3 2/9] block: Support configuring limits below the page size Bart Van Assche
2023-01-18 22:54 ` [PATCH v3 3/9] block: Support submitting passthrough requests with small segments Bart Van Assche
2023-01-18 22:54 ` [PATCH v3 4/9] block: Add support for filesystem requests and " Bart Van Assche
2023-01-18 22:54 ` [PATCH v3 5/9] block: Add support for small segments in blk_rq_map_user_iov() Bart Van Assche
2023-01-18 22:54 ` [PATCH v3 6/9] scsi_debug: Support configuring the maximum segment size Bart Van Assche
2023-01-18 22:54 ` [PATCH v3 7/9] null_blk: " Bart Van Assche
2023-01-18 22:54 ` [PATCH v3 8/9] scsi: core: Set BLK_SUB_PAGE_SEGMENTS for small max_segment_size values Bart Van Assche
2023-01-19 5:38 ` Christoph Hellwig
2023-01-19 17:27 ` Bart Van Assche
2023-01-18 22:54 ` [PATCH v3 9/9] scsi: ufs: exynos: Select CONFIG_BLK_SUB_PAGE_SEGMENTS for lage page sizes Bart Van Assche
2023-01-28 3:55 ` Ming Lei
2023-01-29 1:09 ` Bart Van Assche
2023-01-19 1:18 ` Jens Axboe [this message]
2023-01-19 4:43 ` [PATCH v3 0/9] Add support for segments smaller than one page Bart Van Assche
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