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    SubjectRe: [PATCH 1/4] block: add scalable completion tracking of requests
    On Wed, Nov 02, 2016 at 08:55:16AM -0600, Jens Axboe wrote:
    > On 11/02/2016 08:52 AM, Christoph Hellwig wrote:
    >> 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?
    > Buffered writeback code uses the same base. Additionally, it could
    > replace some user space tracking for latency outliers that people are
    > currently running.


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