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437cb3ded2
CID management OR's two cpumasks and then calculates the weight on the result. That's inefficient as that has to walk the same stuff twice. As this is done with runqueue lock held, there is a real benefit of speeding this up. Depending on the system this results in 10-20% less cycles spent with runqueue lock held for a 4K cpumask. Provide cpumask_weighted_or() and the corresponding bitmap functions which return the weight of the OR result right away. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Yury Norov (NVIDIA) <yury.norov@gmail.com> Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Link: https://patch.msgid.link/20251119172549.448263340@linutronix.de
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.