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    Subject[PATCH v12 7/9] cpuset: Expose cpus.effective and mems.effective on cgroup v2 root
    Date
    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>
    ---
    Documentation/admin-guide/cgroup-v2.rst | 4 ++--
    kernel/cgroup/cpuset.c | 2 --
    2 files changed, 2 insertions(+), 4 deletions(-)

    diff --git a/Documentation/admin-guide/cgroup-v2.rst b/Documentation/admin-guide/cgroup-v2.rst
    index 234fb18..655e54e 100644
    --- a/Documentation/admin-guide/cgroup-v2.rst
    +++ b/Documentation/admin-guide/cgroup-v2.rst
    @@ -1613,7 +1613,7 @@ 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
    @@ -1653,7 +1653,7 @@ 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
    diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c
    index 286b851..0e41b62 100644
    --- a/kernel/cgroup/cpuset.c
    +++ b/kernel/cgroup/cpuset.c
    @@ -2182,14 +2182,12 @@ static s64 cpuset_read_s64(struct cgroup_subsys_state *css, struct cftype *cft)
    .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,
    },

    {
    --
    1.8.3.1
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