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| author | Tejun Heo <tj@kernel.org> | 2022-07-27 07:54:55 -1000 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2022-07-27 07:54:55 -1000 |
| commit | c808f4632349bda65b2ec41220f0a2035f780619 (patch) | |
| tree | 9c4532f389670953a787357154a3ed51524d0498 /Documentation/admin-guide | |
| parent | 6a010a49b63ac8465851a79185d8deff966f8e1a (diff) | |
| download | linux-stable-c808f4632349bda65b2ec41220f0a2035f780619.tar.gz linux-stable-c808f4632349bda65b2ec41220f0a2035f780619.tar.bz2 linux-stable-c808f4632349bda65b2ec41220f0a2035f780619.zip | |
cgroup: remove "no" prefixed mount options
30312730bd02 ("cgroup: Add "no" prefixed mount options") added "no" prefixed
mount options to allow turning them off and 6a010a49b63a ("cgroup: Make
!percpu threadgroup_rwsem operations optional") added one more "no" prefixed
mount option. However, Michal pointed out that the "no" prefixed options
aren't necessary in allowing mount options to be turned off:
# grep group /proc/mounts
cgroup2 /sys/fs/cgroup cgroup2 rw,nosuid,nodev,relatime,nsdelegate,memory_recursiveprot 0 0
# mount -o remount,nsdelegate,memory_recursiveprot none /sys/fs/cgroup
# grep cgroup /proc/mounts
cgroup2 /sys/fs/cgroup cgroup2 rw,relatime,nsdelegate,memory_recursiveprot 0 0
Note that this is different from the remount behavior when the mount(1) is
invoked without the device argument - "none":
# grep cgroup /proc/mounts
cgroup2 /sys/fs/cgroup cgroup2 rw,nosuid,nodev,noexec,relatime,nsdelegate,memory_recursiveprot 0 0
# mount -o remount,nsdelegate,memory_recursiveprot /sys/fs/cgroup
# grep cgroup /proc/mounts
cgroup2 /sys/fs/cgroup cgroup2 rw,nosuid,nodev,noexec,relatime,nsdelegate,memory_recursiveprot 0 0
While a bit confusing, given that there is a way to turn off the options,
there's no reason to have the explicit "no" prefixed options. Let's remove
them.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Michal Koutný <mkoutny@suse.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'Documentation/admin-guide')
| -rw-r--r-- | Documentation/admin-guide/cgroup-v2.rst | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/Documentation/admin-guide/cgroup-v2.rst b/Documentation/admin-guide/cgroup-v2.rst index 4bd0bee22a0d..bf842b80bde9 100644 --- a/Documentation/admin-guide/cgroup-v2.rst +++ b/Documentation/admin-guide/cgroup-v2.rst @@ -177,14 +177,14 @@ disabling controllers in v1 and make them always available in v2. cgroup v2 currently supports the following mount options. - [no]nsdelegate + nsdelegate Consider cgroup namespaces as delegation boundaries. This option is system wide and can only be set on mount or modified through remount from the init namespace. The mount option is ignored on non-init namespace mounts. Please refer to the Delegation section for details. - [no]favordynmods + favordynmods Reduce the latencies of dynamic cgroup modifications such as task migrations and controller on/offs at the cost of making hot path operations such as forks and exits more expensive. @@ -192,7 +192,7 @@ cgroup v2 currently supports the following mount options. controllers, and then seeding it with CLONE_INTO_CGROUP is not affected by this option. - memory_[no]localevents + memory_localevents Only populate memory.events with data for the current cgroup, and not any subtrees. This is legacy behaviour, the default behaviour without this option is to include subtree counts. @@ -200,7 +200,7 @@ cgroup v2 currently supports the following mount options. modified through remount from the init namespace. The mount option is ignored on non-init namespace mounts. - memory_[no]recursiveprot + memory_recursiveprot Recursively apply memory.min and memory.low protection to entire subtrees, without requiring explicit downward propagation into leaf cgroups. This allows protecting entire |