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cpuset: Expose cpus.effective and mems.effective on cgroup v2 root

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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>
This commit is contained in:
Waiman Long 2018-11-08 10:08:43 -05:00 committed by Tejun Heo
parent 0ccea8feb9
commit 5776ceccd4
2 changed files with 2 additions and 4 deletions
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4
Documentation/admin-guide/cgroup-v2.rst
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@ -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

2
kernel/cgroup/cpuset.c
View File

@ -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,
},
{