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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2021-08-31 15:49:04 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-08-31 15:49:04 -0700 |
| commit | 69dc8010b8fca475170650a4ebbc0074541df859 (patch) | |
| tree | 780404347b60da432a098061c5ad1f654515d777 /Documentation/admin-guide | |
| parent | 81b0b29bf70bb8b459cf1f0b4a6a4898be457850 (diff) | |
| parent | d20d30ebb199354729c64c86945ed25c66ff4991 (diff) | |
| download | lwn-69dc8010b8fca475170650a4ebbc0074541df859.tar.gz lwn-69dc8010b8fca475170650a4ebbc0074541df859.zip | |
Merge branch 'for-5.15' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup
Pull cgroup updates from Tejun Heo:
"Two cpuset behavior changes:
- cpuset on cgroup2 is changed to enable memory migration based on
nodemask by default.
- A notification is generated when cpuset partition state changes.
All other patches are minor fixes and cleanups"
* 'for-5.15' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup:
cgroup: Avoid compiler warnings with no subsystems
cgroup/cpuset: Avoid memory migration when nodemasks match
cgroup/cpuset: Enable memory migration for cpuset v2
cgroup/cpuset: Enable event notification when partition state changes
cgroup: cgroup-v1: clean up kernel-doc notation
cgroup: Replace deprecated CPU-hotplug functions.
cgroup/cpuset: Fix violation of cpuset locking rule
cgroup/cpuset: Fix a partition bug with hotplug
cgroup/cpuset: Miscellaneous code cleanup
cgroup: remove cgroup_mount from comments
Diffstat (limited to 'Documentation/admin-guide')
| -rw-r--r-- | Documentation/admin-guide/cgroup-v2.rst | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/Documentation/admin-guide/cgroup-v2.rst b/Documentation/admin-guide/cgroup-v2.rst index 5c7377b5bd3e..babbe04c8d37 100644 --- a/Documentation/admin-guide/cgroup-v2.rst +++ b/Documentation/admin-guide/cgroup-v2.rst @@ -2056,6 +2056,17 @@ Cpuset Interface Files The value of "cpuset.mems" stays constant until the next update and won't be affected by any memory nodes hotplug events. + Setting a non-empty value to "cpuset.mems" causes memory of + tasks within the cgroup to be migrated to the designated nodes if + they are currently using memory outside of the designated nodes. + + There is a cost for this memory migration. The migration + may not be complete and some memory pages may be left behind. + So it is recommended that "cpuset.mems" should be set properly + before spawning new tasks into the cpuset. Even if there is + a need to change "cpuset.mems" with active tasks, it shouldn't + be done frequently. + cpuset.mems.effective A read-only multiple values file which exists on all cpuset-enabled cgroups. |