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SubjectRe: [PATCH v3] cpuset: Enable cpuset controller in default hierarchy
Hello, Waiman.

Sorry about the long delay.

On Fri, Oct 06, 2017 at 05:10:30PM -0400, Waiman Long wrote:
> +Cpuset Interface Files
> +~~~~~~~~~~~~~~~~~~~~~~
> +
> + cpuset.cpus
> + A read-write multiple values file which exists on non-root
> + cgroups.
> +
> + It lists the CPUs allowed to be used by tasks within this
> + cgroup. The CPU numbers are comma-separated numbers or
> + ranges. For example:
> +
> + # cat cpuset.cpus
> + 0-4,6,8-10
> +
> + An empty value indicates that the cgroup is using the same
> + setting as the nearest cgroup ancestor with a non-empty
> + "cpuset.cpus" or all the available CPUs if none is found.
> +
> + The value of "cpuset.cpus" stays constant until the next update
> + and won't be affected by any CPU hotplug events.
> +
> + cpuset.effective_cpus

Can we do cpuset.ecpus in the fashion of euid, egid..?

> + cpuset.effective_mems

Ditto.

> + cpuset.flags
> + A read-write multiple values file which exists on non-root
> + cgroups.
> +
> + It lists the flags that are set (with a '+' prefix) and those
> + that are not set (with a '-' prefix). The currently supported
> + flag is:
> +
> + mem_migrate
> + When it is not set, an allocated memory page will
> + stay in whatever node it was allocated independent
> + of changes in "cpuset.mems".
> +
> + When it is set, tasks with memory pages not in
> + "cpuset.mems" will have those pages migrated over to
> + memory nodes specified in "cpuset.mems". Any changes
> + to "cpuset.mems" will cause pages in nodes that are
> + no longer valid to be migrated over to the newly
> + valid nodes.

Let's start just with [e]cpus and [e]mems. The flags interface looks
fine but the implementations of these features are really bad and
cgroup2 doesn't migrate resources for other controllers either anyway.

Thanks.

--
tejun

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