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There have been reported cases of bypass mode not making forward progress fast enough. The 20ms default slice is unnecessarily long for bypass mode where the primary goal is ensuring all tasks can make forward progress. Introduce SCX_SLICE_BYPASS set to 5ms and make the scheduler automatically switch to it when entering bypass mode. Also make the bypass slice value tunable through the slice_bypass_us module parameter (adjustable between 100us and 100ms) to make it easier to test whether slice durations are a factor in problem cases. v3: Use READ_ONCE/WRITE_ONCE for scx_slice_dfl access (Dan). v2: Removed slice_dfl_us module parameter. Fixed typos (Andrea). Reviewed-by: Emil Tsalapatis <emil@etsalapatis.com> Reviewed-by: Andrea Righi <arighi@nvidia.com> Cc: Dan Schatzberg <schatzberg.dan@gmail.com> Signed-off-by: Tejun Heo <tj@kernel.org>
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 reStructuredText 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.