Re: [PATCH v3 0/2] docs: cgroup-v2: Correct cpuset CPU descriptions

From: Waiman Long

Date: Tue Sep 22 2026 - 19:31:05 EST


On 9/22/26 5:20 AM, Guopeng Zhang wrote:
From: Guopeng Zhang <zhangguopeng@xxxxxxxxxx>

The cpuset interface documentation says cpuset.cpus.isolated is empty
unless an isolated partition exists, omitting CPUs isolated at boot with
isolcpus=domain. Its cpuset.cpus.effective description also assumes CPUs
come from the immediate parent and are normally a subset of
cpuset.cpus, which is not always true for valid non-root partition roots.

Update both descriptions to match the existing behavior.

Changes since v2:
- Update the valid partition root example to show that an offline CPU
can remain in cpuset.cpus.exclusive.effective while being excluded
from cpuset.cpus.effective.
- Add the Reviewed-by tag to patch 2.
- Patch 1 is unchanged.

Guopeng Zhang (2):
docs: cgroup-v2: Describe boot-isolated CPUs in cpuset.cpus.isolated
docs: cgroup-v2: Describe effective CPUs of partition roots

Documentation/admin-guide/cgroup-v2.rst | 62 ++++++++++++++++++++-----
1 file changed, 51 insertions(+), 11 deletions(-)

For the patch series,

Reviewed-by: Waiman Long <longman@xxxxxxxxxx>