cgroup: Changes for v7.4

Hello,

The following changes since commit b8eb5fd5bdb4c03758b056c70e5e1d962ca89757:

cgroup/cpuset: Call is_in_v2_mode() after acquiring cpuset_mutex in cpuset_handle_hotplug() (2026-10-06 06:36:51 -1000)

are available in the Git repository at:

https://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git tags/cgroup-for-7.4

for you to fetch changes up to 1850c669516cb8568150937497a9a16a7bfa1582:

selftests/cgroup: test pids.events notification (2026-10-16 09:52:06 -1000)

----------------------------------------------------------------
cgroup: Changes for v7.4

- A write to cgroup.subtree_control or cgroup.type could hang in D state for as long as a task pinning a dying controller took to exit, as syzbot reported. The wait is now interruptible.

- cpuset: the deadline bandwidth check ran on cpusets that weren't valid partition roots, failing cpuset writes with -EBUSY while deadline tasks existed. The CPU count the fair class takes from cpuset assumed a shared hierarchy that cgroup1 may not have.

- Finding a cgroup's effective controller state no longer walks up the hierarchy, for per-I/O users such as nvmet. io.stat reads of cgroups without block devices skip the stat flush.

- cpuset v1-only code moved to the v1 file and the exclusive flag dropped from v2, with documentation corrections for partition roots and boot-isolated CPUs.

- Dead cgroups fail writes with -ENODEV consistently, plus small cleanups.

- Selftest fixes, most visibly for tests that skipped on machines with many mounts, and a new pids.events notification test.

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Guopeng Zhang (3):
cgroup/cpuset: Remove redundant sched domain rebuild from update_prstate()
docs: cgroup-v2: Describe boot-isolated CPUs in cpuset.cpus.isolated
docs: cgroup-v2: Describe effective CPUs of partition roots

Karl Mehltretter (1):
cgroup/dmem: Fix eviction helper reference in dmem_cgroup_try_charge()

Konstantin Khorenko (2):
selftests: cgroup: skip test_memcg_sock under cgroup.memory=nosocket
selftests: cgroup: make test_memcg_sock check flushed sock stats

Peng Fan (1):
cgroup: use assign_bit() where applicable

Peng Yu (1):
cgroup: Track the effective css in each cgroup

Ren Tamura (2):
selftests: cgroup: Enable the cpu controller in test_cpu
selftests: cgroup: Preserve command arguments in with_stress.sh

Ridong Chen (1):
cgroup/cpuset: Move cpuset_update_flag() to cpuset-v1.c

Sahaj Chaudhari (1):
selftests/cgroup: test pids.events notification

Sasha Levin (2):
selftests: memcg: Don't close an uninitialized fd selftests/cgroup: Free the paths returned by cg_control()

Sebastian Andrzej Siewior (2):
cgroup: Move cgrp_dead_ task+iwork into its own struct
cgroup: Use %p for pointer formatting

Shaojie Sun (3):
cgroup: namespace: Drop BUG_ON() in copy_cgroup_ns() selftests/cgroup: read the entire file in read_text() selftests/cgroup: don't crash on a truncated mount entry in cg_find_root()

Tejun Heo (4):
cgroup: Return -ENODEV consistently for a dead cgroup
cgroup: Return ERR_PTR from cgroup_kn_lock_live()
cgroup: Make the offline drain interruptible
cgroup: Merge branch 'for-7.3-fixes' into for-7.4

Usama Arif (1):
blk-cgroup: skip rstat flush for cgroups without blkgs

Vishal Chourasia (1):
selftests/cgroup: add settings file with a longer timeout

Waiman Long (3):
cgroup/cpuset: Run SCHED_DEADLINE shrink test on valid partition root only cgroup/cpuset: Remove CS_CPU_EXCLUSIVE handling code from v2 cgroup/cpuset: Use cpuset_v2() in cpuset_num_cpus()

 Documentation/admin-guide/cgroup-v2.rst            |  62 +++++--
 block/blk-cgroup.c                                 |  11 +-
 include/linux/cgroup-defs.h                        |   8 +
 kernel/cgroup/cgroup-internal.h                    |   2 +-
 kernel/cgroup/cgroup-v1.c                          |  26 ++-
 kernel/cgroup/cgroup.c                             | 181 +++++++++++++--------
 kernel/cgroup/cpuset-internal.h                    |   8 +-
 kernel/cgroup/cpuset-v1.c                          |  59 ++++++-
 kernel/cgroup/cpuset.c                             | 145 ++---------------
 kernel/cgroup/debug.c                              |  18 +-
 kernel/cgroup/dmem.c                               |   4 +-
 kernel/cgroup/freezer.c                            |   5 +-
 kernel/cgroup/namespace.c                          |   2 -
 tools/testing/selftests/cgroup/lib/cgroup_util.c   |  58 ++++++-
 .../selftests/cgroup/lib/include/cgroup_util.h     |   3 +
 tools/testing/selftests/cgroup/settings            |   1 +
 tools/testing/selftests/cgroup/test_cpu.c          |   5 +-
 tools/testing/selftests/cgroup/test_kmem.c         |   2 +-
 tools/testing/selftests/cgroup/test_memcontrol.c   |  81 ++++++---
 tools/testing/selftests/cgroup/test_pids.c         |  73 +++++++++
 tools/testing/selftests/cgroup/with_stress.sh      |   2 +-
 21 files changed, 471 insertions(+), 285 deletions(-)
 create mode 100644 tools/testing/selftests/cgroup/settings

tejun