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| author | Waiman Long <longman@redhat.com> | 2024-06-17 17:39:44 +0300 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2024-06-19 20:37:38 +0300 |
| commit | 737bb142a00d53de3743ae389732721b3b9f0191 (patch) | |
| tree | 6df08265b7d308b8d40431cf711d76d1b4e2eeca /Documentation/admin-guide/cgroup-v2.rst | |
| parent | fe8cd2736e75c8ca3aed1ef181a834e41dc5310f (diff) | |
| download | linux-737bb142a00d53de3743ae389732721b3b9f0191.tar.xz | |
cgroup/cpuset: Make cpuset.cpus.exclusive independent of cpuset.cpus
The "cpuset.cpus.exclusive.effective" value is currently limited to a
subset of its "cpuset.cpus". This makes the exclusive CPUs distribution
hierarchy subsumed within the larger "cpuset.cpus" hierarchy. We have to
decide on what CPUs are used locally and what CPUs can be passed down as
exclusive CPUs down the hierarchy and combine them into "cpuset.cpus".
The advantage of the current scheme is to have only one hierarchy to
worry about. However, it make it harder to use as all the "cpuset.cpus"
values have to be properly set along the way down to the designated remote
partition root. It also makes it more cumbersome to find out what CPUs
can be used locally.
Make creation of remote partition simpler by breaking the
dependency of "cpuset.cpus.exclusive" on "cpuset.cpus" and make
them independent entities. Now we have two separate hierarchies -
one for setting "cpuset.cpus.effective" and the other one for setting
"cpuset.cpus.exclusive.effective". We may not need to set "cpuset.cpus"
when we activate a partition root anymore.
Also update Documentation/admin-guide/cgroup-v2.rst and cpuset.c comment
to document this change.
Suggested-by: Petr Malat <oss@malat.biz>
Signed-off-by: Waiman Long <longman@redhat.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'Documentation/admin-guide/cgroup-v2.rst')
| -rw-r--r-- | Documentation/admin-guide/cgroup-v2.rst | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/Documentation/admin-guide/cgroup-v2.rst b/Documentation/admin-guide/cgroup-v2.rst index 722e4762c4e0..2e4e74bea6ef 100644 --- a/Documentation/admin-guide/cgroup-v2.rst +++ b/Documentation/admin-guide/cgroup-v2.rst @@ -2380,8 +2380,8 @@ Cpuset Interface Files cpuset-enabled cgroups. This file shows the effective set of exclusive CPUs that - can be used to create a partition root. The content of this - file will always be a subset of "cpuset.cpus" and its parent's + can be used to create a partition root. The content + of this file will always be a subset of its parent's "cpuset.cpus.exclusive.effective" if its parent is not the root cgroup. It will also be a subset of "cpuset.cpus.exclusive" if it is set. If "cpuset.cpus.exclusive" is not set, it is |