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Currently, a callback-invocation time limit is enforced only for callbacks invoked from the softirq environment, the rationale being that when callbacks are instead invoked from rcuc and rcuoc kthreads, these callbacks cannot be holding up other softirq vectors. Which is in fact true. However, if an rcuc kthread spends too much time invoking callbacks, it can delay quiescent-state reports from its CPU, which can also be a problem. This commit therefore applies the callback-invocation time limit to callback invocation from the rcuc kthreads as well as from softirq. Signed-off-by: Paul E. McKenney <paulmck@kernel.org> |
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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.