The following changes since commit e71e60cd74df9386c3f684c54888f2367050b831:
Merge tag 'dma-mapping-5.19-2022-06-06' of git://git.infradead.org/users/hch/dma-mapping (2022-06-06 17:56:18 -0700)
are available in the Git repository at:
git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git/ tags/cgroup-for-5.20
for you to fetch changes up to 265792d0dede9259f0ca56bb3efcc23eceee7d01:
cgroup: Skip subtree root in cgroup_update_dfl_csses() (2022-07-28 07:26:30 -1000)
----------------------------------------------------------------
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.
----------------------------------------------------------------
Chen Wandun (1):
psi: dont alloc memory for psi by default
Lin Feng (2):
cgroup.c: add helper __cset_cgroup_from_root to cleanup duplicated codes
cgroup.c: remove redundant check for mixable cgroup in cgroup_migrate_vet_dst
Tejun Heo (4):
cgroup: Elide write-locking threadgroup_rwsem when updating csses on an empty subtree
cgroup: Add "no" prefixed mount options
cgroup: Make !percpu threadgroup_rwsem operations optional
cgroup: remove "no" prefixed mount options
Waiman Long (1):
cgroup: Skip subtree root in cgroup_update_dfl_csses()
Documentation/admin-guide/cgroup-v2.rst | 8 ++
include/linux/cgroup-defs.h | 21 ++++-
include/linux/cgroup.h | 2 +-
init/Kconfig | 10 +++
kernel/cgroup/cgroup-internal.h | 1 +
kernel/cgroup/cgroup-v1.c | 17 +++-
kernel/cgroup/cgroup.c | 136 ++++++++++++++++++++------------
kernel/sched/psi.c | 19 +++--
8 files changed, 151 insertions(+), 63 deletions(-)
