diff options
Diffstat (limited to 'Documentation/admin-guide')
| -rw-r--r-- | Documentation/admin-guide/cgroup-v2.rst | 15 | ||||
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 9 |
2 files changed, 22 insertions, 2 deletions
diff --git a/Documentation/admin-guide/cgroup-v2.rst b/Documentation/admin-guide/cgroup-v2.rst index 4e59925e6583..5c7377b5bd3e 100644 --- a/Documentation/admin-guide/cgroup-v2.rst +++ b/Documentation/admin-guide/cgroup-v2.rst @@ -953,6 +953,21 @@ All cgroup core files are prefixed with "cgroup." it's possible to delete a frozen (and empty) cgroup, as well as create new sub-cgroups. + cgroup.kill + A write-only single value file which exists in non-root cgroups. + The only allowed value is "1". + + Writing "1" to the file causes the cgroup and all descendant cgroups to + be killed. This means that all processes located in the affected cgroup + tree will be killed via SIGKILL. + + Killing a cgroup tree will deal with concurrent forks appropriately and + is protected against migrations. + + In a threaded cgroup, writing this file fails with EOPNOTSUPP as + killing cgroups is a process directed operation, i.e. it affects + the whole thread-group. + Controllers =========== diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 2991f6e692bd..0315407f5f57 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -497,16 +497,21 @@ ccw_timeout_log [S390] See Documentation/s390/common_io.rst for details. - cgroup_disable= [KNL] Disable a particular controller - Format: {name of the controller(s) to disable} + cgroup_disable= [KNL] Disable a particular controller or optional feature + Format: {name of the controller(s) or feature(s) to disable} The effects of cgroup_disable=foo are: - foo isn't auto-mounted if you mount all cgroups in a single hierarchy - foo isn't visible as an individually mountable subsystem + - if foo is an optional feature then the feature is + disabled and corresponding cgroup files are not + created {Currently only "memory" controller deal with this and cut the overhead, others just disable the usage. So only cgroup_disable=memory is actually worthy} + Specifying "pressure" disables per-cgroup pressure + stall information accounting feature cgroup_no_v1= [KNL] Disable cgroup controllers and named hierarchies in v1 Format: { { controller | "all" | "named" } |