cpuset: Expose cpus.effective and mems.effective on cgroup v2 root (5776cecc) · Commits · 戴 / test

Because of the fact that setting the "cpuset.sched.partition" in a direct child of root can remove CPUs from the root's effective CPU list, it makes sense to know what CPUs are left in the root cgroup for scheduling purpose. So the "cpuset.cpus.effective" control file is now exposed in the v2 cgroup root. For consistency, the "cpuset.mems.effective" control file is exposed as well. Signed-off-by:

Waiman Long <longman@redhat.com> Acked-by:

Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by:

Tejun Heo <tj@kernel.org>

Documentation/admin-guide/cgroup-v2.rst

+2 −2

Original line number	Diff line number	Diff line
		@@ -1653,7 +1653,7 @@ Cpuset Interface Files
		and won't be affected by any CPU hotplug events.

		cpuset.cpus.effective
		A read-only multiple values file which exists on non-root
		A read-only multiple values file which exists on all
		cpuset-enabled cgroups.

		It lists the onlined CPUs that are actually granted to this
		@@ -1693,7 +1693,7 @@ Cpuset Interface Files
		and won't be affected by any memory nodes hotplug events.

		cpuset.mems.effective
		A read-only multiple values file which exists on non-root
		A read-only multiple values file which exists on all
		cpuset-enabled cgroups.

		It lists the onlined memory nodes that are actually granted to

kernel/cgroup/cpuset.c

+0 −2

Original line number	Diff line number	Diff line
		@@ -2574,14 +2574,12 @@ static struct cftype dfl_files[] = {
		.name = "cpus.effective",
		.seq_show = cpuset_common_seq_show,
		.private = FILE_EFFECTIVE_CPULIST,
		.flags = CFTYPE_NOT_ON_ROOT,
		},

		{
		.name = "mems.effective",
		.seq_show = cpuset_common_seq_show,
		.private = FILE_EFFECTIVE_MEMLIST,
		.flags = CFTYPE_NOT_ON_ROOT,
		},

		{

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