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Currently, the rcu_torture_writer() function checks that all required grace periods elapse during a stutter interval, which is a multi-second time period during which the test load is removed. However, this check is suppressed during early boot (that is, before init is spawned) in order to avoid false positives that otherwise occur due to heavy load on the single boot CPU. Unfortunately, this approach is insufficient. It is possible that the stutter interval might end just as init is spawned, so that early boot conditions prevailed during almost the entire stutter interval. This commit therefore takes a snapshot of boot-complete state just before the stutter interval, thus suppressing the check for failure to complete grace periods unless the entire stutter interval took place after early boot. Signed-off-by: Paul E. McKenney <paulmck@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 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.