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Debt reduction was blocked if any iocg was short on budget in the past period to avoid reducing debts while some iocgs are saturated. However, this ends up unnecessarily blocking debt reduction due to temporary local imbalances when the device is generally being underutilized, while also failing to block when the underlying device is overwhelmed and the usage becomes low from high latency. Given that debt accumulation mostly happens with swapout bursts which can significantly deteriorate the underlying device's latency response, the current logic is not great. Let's replace it with ioc->busy_level based condition so that we block debt reduction when the underlying device is being saturated. ioc_forgive_debts() call is moved after busy_level determination. Signed-off-by: Tejun Heo <tj@kernel.org> 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.