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915b3dde9b
We currently spin in iopoll() when requests to be iopolled are for same file(device), while one device may have multiple hardware queues. given an example: hw_queue_0 | hw_queue_1 req(30us) req(10us) If we first spin on iopolling for the hw_queue_0. the avg latency would be (30us + 30us) / 2 = 30us. While if we do round robin, the avg latency would be (30us + 10us) / 2 = 20us since we reap the request in hw_queue_1 in time. So it's better to do spinning only when requests are in same hardware queue. Signed-off-by: Hao Xu <haoxu@linux.alibaba.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.