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The "cpuset.cpus.exclusive.effective" value is currently limited to a subset of its "cpuset.cpus". This makes the exclusive CPUs distribution hierarchy subsumed within the larger "cpuset.cpus" hierarchy. We have to decide on what CPUs are used locally and what CPUs can be passed down as exclusive CPUs down the hierarchy and combine them into "cpuset.cpus". The advantage of the current scheme is to have only one hierarchy to worry about. However, it make it harder to use as all the "cpuset.cpus" values have to be properly set along the way down to the designated remote partition root. It also makes it more cumbersome to find out what CPUs can be used locally. Make creation of remote partition simpler by breaking the dependency of "cpuset.cpus.exclusive" on "cpuset.cpus" and make them independent entities. Now we have two separate hierarchies - one for setting "cpuset.cpus.effective" and the other one for setting "cpuset.cpus.exclusive.effective". We may not need to set "cpuset.cpus" when we activate a partition root anymore. Also update Documentation/admin-guide/cgroup-v2.rst and cpuset.c comment to document this change. Suggested-by: Petr Malat <oss@malat.biz> Signed-off-by: Waiman Long <longman@redhat.com> Signed-off-by: Tejun Heo <tj@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 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.