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Whether a cgroup is frozen is determined solely by whether it is set to to be frozen and whether its parent is frozen. Currently, when is cgroup is frozen or unfrozen, it iterates through the entire subtree to freeze or unfreeze its descentdants. However, this is unesessary for a cgroup that does not change its effective frozen status. This path aims to skip the subtree if its parent does not have a change in effective freeze. For an example, subtree like, a-b-c-d-e-f-g, when a is frozen, the entire tree is frozen. If we freeze b and c again, it is unesessary to iterate d, e, f and g. So does that If we unfreeze b/c. Reviewed-by: Michal Koutný <mkoutny@suse.com> Signed-off-by: Chen Ridong <chenridong@huawei.com> Signed-off-by: Tejun Heo <tj@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 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.