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authorLinus Torvalds <torvalds@linux-foundation.org>2022-08-03 09:45:08 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2022-08-03 09:45:08 -0700
commitb6bb70f9ab80a11161252bf217993d2c40ea5eb2 (patch)
treeca1d2669919d6b335dc6c28aa04cd089e5fa274f /init
parente2b542100719a93f8cdf6d90185410d38a57a4c1 (diff)
parent265792d0dede9259f0ca56bb3efcc23eceee7d01 (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 'init')
-rw-r--r--init/Kconfig10
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