c04dd09bd3
Currently, rcutorture provisions rcu_torture_reader() kthreads based on the initial number of CPUs. This can be problematic when CPU hotplug is enabled, as a system with a very large number of CPUs will provision a very large number of rcu_torture_reader() kthreads. All of these kthreads will continue running even if the CPU-hotplug operations result in only one remaining online CPU. This can result in all sorts of strange artifacts due simply to massive overload. This commit therefore causes the rcu_torture_reader() kthreads to start blocking as the number of online CPUs decreases. This is accomplished by numbering these kthreads, and having each check to make sure that the number of online CPUs is at least as large as its assigned number. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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.