diff options
| author | Linus Torvalds | 2022-08-03 09:45:08 -0700 |
|---|---|---|
| committer | Linus Torvalds | 2022-08-03 09:45:08 -0700 |
| commit | b6bb70f9ab80a11161252bf217993d2c40ea5eb2 (patch) | |
| tree | ca1d2669919d6b335dc6c28aa04cd089e5fa274f /Documentation | |
| parent | e2b542100719a93f8cdf6d90185410d38a57a4c1 (diff) | |
| parent | 265792d0dede9259f0ca56bb3efcc23eceee7d01 (diff) | |
Merge tag 'cgroup-for-5.20' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup
Pull cgroup updates from Tejun Heo:
"Several core optimizations:
- threadgroup_rwsem write locking is skipped when configuring
controllers in empty subtrees.
Combined with CLONE_INTO_CGROUP, this allows the common static
usage pattern to not grab threadgroup_rwsem at all (glibc still
doesn't seem ready for CLONE_INTO_CGROUP unfortunately).
- threadgroup_rwsem used to be put into non-percpu mode by default
due to latency concerns in specific use cases. There's no reason
for everyone else to pay for it. Make the behavior optional.
- psi no longer allocates memory when disabled.
... along with some code cleanups"
* tag 'cgroup-for-5.20' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup:
cgroup: Skip subtree root in cgroup_update_dfl_csses()
cgroup: remove "no" prefixed mount options
cgroup: Make !percpu threadgroup_rwsem operations optional
cgroup: Add "no" prefixed mount options
cgroup: Elide write-locking threadgroup_rwsem when updating csses on an empty subtree
cgroup.c: remove redundant check for mixable cgroup in cgroup_migrate_vet_dst
cgroup.c: add helper __cset_cgroup_from_root to cleanup duplicated codes
psi: dont alloc memory for psi by default
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/admin-guide/cgroup-v2.rst | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/Documentation/admin-guide/cgroup-v2.rst b/Documentation/admin-guide/cgroup-v2.rst index 176298f2f4de..bf842b80bde9 100644 --- a/Documentation/admin-guide/cgroup-v2.rst +++ b/Documentation/admin-guide/cgroup-v2.rst @@ -184,6 +184,14 @@ cgroup v2 currently supports the following mount options. ignored on non-init namespace mounts. Please refer to the Delegation section for details. + 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. + The static usage pattern of creating a cgroup, enabling + controllers, and then seeding it with CLONE_INTO_CGROUP is + not affected by this option. + memory_localevents Only populate memory.events with data for the current cgroup, and not any subtrees. This is legacy behaviour, the default |