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Message-ID: <21156f925598248ffe7d2d5f00b212da@kernel.org>
Date: Fri, 26 Sep 2025 10:22:50 -1000
From: Tejun Heo <tj@...nel.org>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org, Johannes Weiner <hannes@...xchg.org>, Michal Koutný <mkoutny@...e.com>, Waiman Long <longman@...hat.com>, cgroups@...r.kernel.org
Subject: [GIT PULL] cgroup: Changes for v6.18
The following changes since commit 94a4acfec14615e971eb2c9e1fa6c992c85ff6c6:
cgroup/psi: Set of->priv to NULL upon file release (2025-08-22 07:47:43 -1000)
are available in the Git repository at:
https://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git tags/cgroup-for-6.18
for you to fetch changes up to 8f0fdbd4a06bf795c68bc9839d9c349ab592654f:
cpuset: remove is_prs_invalid helper (2025-09-22 12:57:46 -1000)
----------------------------------------------------------------
cgroup: Changes for v6.18
- Extensive cpuset code cleanup and refactoring work with no functional
changes: CPU mask computation logic refactoring, introducing new helpers,
removing redundant code paths, and improving error handling for better
maintainability.
- A few bug fixes to cpuset including fixes for partition creation failures
when isolcpus is in use, missing error returns, and null pointer access
prevention in free_tmpmasks().
- Core cgroup changes include replacing the global percpu_rwsem with
per-threadgroup rwsem when writing to cgroup.procs for better scalability,
workqueue conversions to use WQ_PERCPU and system_percpu_wq to prepare for
workqueue default switching from percpu to unbound, and removal of unused
code including the post_attach callback.
- New cgroup.stat.local time accounting feature that tracks frozen time
duration.
- Misc changes including selftests updates (new freezer time tests and
backward compatibility fixes), documentation sync, string function safety
improvements, and 64-bit division fixes.
----------------------------------------------------------------
Bagas Sanjaya (1):
Documentation: cgroup-v2: Sync manual toctree
Chen Ridong (21):
cpuset: remove redundant CS_ONLINE flag
cpuset: decouple tmpmasks and cpumasks freeing in cgroup
cpuset: separate tmpmasks and cpuset allocation logic
cpuset: add helpers for cpus read and cpuset_mutex locks
cpuset: move the root cpuset write check earlier
cpuset: remove unused assignment to trialcs->partition_root_state
cpuset: change return type of is_partition_[in]valid to bool
cpuset: Refactor exclusive CPU mask computation logic
cpuset: refactor CPU mask buffer parsing logic
cpuset: introduce cpus_excl_conflict and mems_excl_conflict helpers
cpuset: refactor out validate_partition
cpuset: refactor cpus_allowed_validate_change
cpuset: introduce partition_cpus_change
cpuset: use parse_cpulist for setting cpus.exclusive
cpuset: use partition_cpus_change for setting exclusive cpus
cpuset: fix failure to enable isolated partition when containing isolcpus
cpuset: Use new excpus for nocpu error check when enabling root partition
cpuset: fix missing error return in update_cpumask
cpuset: remove redundant special case for null input in node mask update
cpuset: remove impossible warning in update_parent_effective_cpumask
cpuset: remove is_prs_invalid helper
Chuyi Zhou (3):
cpuset: Don't always flush cpuset_migrate_mm_wq in cpuset_write_resmask
cpuset: Defer flushing of the cpuset_migrate_mm_wq to task_work
cgroup: Remove unused cgroup_subsys::post_attach
Marco Crivellari (2):
cgroup: replace use of system_wq with system_percpu_wq
cgroup: WQ_PERCPU added to alloc_workqueue users
Michal Koutný (1):
selftests: cgroup: Make test_pids backwards compatible
Tejun Heo (2):
cgroup: Remove unused local variables from cgroup_procs_write_finish()
cgroup: Merge branch 'for-6.17-fixes' into for-6.18
Thorsten Blum (1):
cgroup: Replace deprecated strcpy() with strscpy()
Tiffany Yang (3):
cgroup: cgroup.stat.local time accounting
cgroup: selftests: Add tests for freezer time
cgroup: Fix 64-bit division in cgroup.stat.local
Waiman Long (1):
cgroup/cpuset: Prevent NULL pointer access in free_tmpmasks()
Yi Tao (3):
cgroup: refactor the cgroup_attach_lock code to make it clearer
cgroup: relocate cgroup_attach_lock within cgroup_procs_write_start
cgroup: replace global percpu_rwsem with per threadgroup resem when writing to cgroup.procs
pengdonglin (2):
cgroup: Remove redundant rcu_read_lock/unlock() in spin_lock
cgroup/cpuset: Remove redundant rcu_read_lock/unlock() in spin_lock
Documentation/admin-guide/cgroup-v2.rst | 33 +-
include/linux/cgroup-defs.h | 43 +-
include/linux/cgroup.h | 5 +
include/linux/sched/signal.h | 4 +
init/init_task.c | 3 +
kernel/cgroup/cgroup-internal.h | 11 +-
kernel/cgroup/cgroup-v1.c | 19 +-
kernel/cgroup/cgroup.c | 199 ++++--
kernel/cgroup/cpuset-internal.h | 5 +-
kernel/cgroup/cpuset-v1.c | 12 +-
kernel/cgroup/cpuset.c | 752 +++++++++++----------
kernel/cgroup/debug.c | 4 -
kernel/cgroup/freezer.c | 16 +-
kernel/fork.c | 4 +
tools/testing/selftests/cgroup/lib/cgroup_util.c | 12 +
.../selftests/cgroup/lib/include/cgroup_util.h | 1 +
tools/testing/selftests/cgroup/test_freezer.c | 663 ++++++++++++++++++
tools/testing/selftests/cgroup/test_pids.c | 3 +
18 files changed, 1355 insertions(+), 434 deletions(-)
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