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822bc9bac9
On the real systems, the cgroups hierarchies are setup early and just once by the node controller, so, other than number of cgroups, all information in /proc/cgroups remain same for the system uptime. Let's remove the cgroup_mutex usage on reading /proc/cgroups. There is a chance of inconsistent number of cgroups for co-mounted cgroups while printing the information from /proc/cgroups but that is not a big issue. In addition /proc/cgroups is a v1 specific interface, so the dependency on it should reduce over time. The main motivation for removing the cgroup_mutex from /proc/cgroups is to reduce the avenues of its contention. On our fleet, we have observed buggy application hammering on /proc/cgroups and drastically slowing down the node controller on the system which have many negative consequences on other workloads running on the system. Signed-off-by: Shakeel Butt <shakeelb@google.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 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.