linux-kernel - Re: [PATCH 1/4] block: add scalable completion tracking of requests

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Date:   Wed, 2 Nov 2016 15:52:39 +0100
From:   Christoph Hellwig <hch@....de>
To:     Jens Axboe <axboe@...com>
Cc:     axboe@...nel.dk, linux-kernel@...r.kernel.org,
        linux-block@...r.kernel.org, hch@....de
Subject: Re: [PATCH 1/4] block: add scalable completion tracking of requests

On Tue, Nov 01, 2016 at 03:05:22PM -0600, Jens Axboe wrote:
> For legacy block, we simply track them in the request queue. For
> blk-mq, we track them on a per-sw queue basis, which we can then
> sum up through the hardware queues and finally to a per device
> state.

what is the use case for the legacy request tracking?