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We apply a smoothing to the scale changes in order to keep sawtoothy behavior from occurring. However our window for checking if we've missed our target can sometimes be lower than the smoothing interval (500ms), especially on faster drives like ssd's. In order to deal with this keep track of the running tally of the previous intervals that we threw away because we had already done a scale event recently. This is needed for the ssd case as these low latency drives will have bursts of latency, and if it happens to be ok for the window that directly follows the opening of the scale window we could unthrottle when previous windows we were missing our target. Signed-off-by: Josef Bacik <josef@toxicpanda.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.
See Documentation/00-INDEX for a list of what is contained in each file.
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.