linux-kernel - Re: [PATCH v3 5/7] nvme-pci: add device coredump infrastructure

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Message-ID: <20190513140246.GB24840@lst.de>
Date:   Mon, 13 May 2019 16:02:46 +0200
From:   Christoph Hellwig <hch@....de>
To:     Akinobu Mita <akinobu.mita@...il.com>
Cc:     linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Johannes Berg <johannes@...solutions.net>,
        Keith Busch <keith.busch@...el.com>, Jens Axboe <axboe@...com>,
        Christoph Hellwig <hch@....de>,
        Sagi Grimberg <sagi@...mberg.me>,
        Minwoo Im <minwoo.im.dev@...il.com>,
        Kenneth Heitke <kenneth.heitke@...el.com>
Subject: Re: [PATCH v3 5/7] nvme-pci: add device coredump infrastructure

Usage of a scatterlist here is rather bogus as we never use
it for dma mapping.  Why can't you store the various pages in a
large bio_vec and then just issue that to the device in one
get log page command?  (or at least a few if MDTS kicks in?)