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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2022-08-03 09:45:08 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2022-08-03 09:45:08 -0700 |
| commit | b6bb70f9ab80a11161252bf217993d2c40ea5eb2 (patch) | |
| tree | ca1d2669919d6b335dc6c28aa04cd089e5fa274f /init | |
| parent | e2b542100719a93f8cdf6d90185410d38a57a4c1 (diff) | |
| parent | 265792d0dede9259f0ca56bb3efcc23eceee7d01 (diff) | |
| download | lwn-b6bb70f9ab80a11161252bf217993d2c40ea5eb2.tar.gz lwn-b6bb70f9ab80a11161252bf217993d2c40ea5eb2.zip | |
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 'init')
| -rw-r--r-- | init/Kconfig | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/init/Kconfig b/init/Kconfig index 26a544112732..8c9ad53b45dc 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -945,6 +945,16 @@ if CGROUPS config PAGE_COUNTER bool +config CGROUP_FAVOR_DYNMODS + bool "Favor dynamic modification latency reduction by default" + help + This option enables the "favordynmods" mount option by default + which reduces 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. + + Say N if unsure. + config MEMCG bool "Memory controller" select PAGE_COUNTER |