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Message-ID: <20260205233007.6891-1-frederic@kernel.org>
Date: Fri, 6 Feb 2026 00:30:07 +0100
From: Frederic Weisbecker <frederic@...nel.org>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
Tejun Heo <tj@...nel.org>,
Waiman Long <longman@...hat.com>,
frederic@...nel.org
Subject: [GIT PULL] Kthread changes for v7.0
Hello Linus,
Once the merge window opens, please pull the following changes since
commit 9448598b22c50c8a5bb77a9103e2d49f134c9578:
Linux 6.19-rc2 (2025-12-21 15:52:04 -0800)
are available in the Git repository at:
https://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git tags/kthread-for-7.0
for you to fetch changes up to fa39ec4f89f2637ed1cdbcde3656825951787668:
doc: Add housekeeping documentation (2026-02-03 15:23:35 +0100)
----------------------------------------------------------------
The kthread code provides an infrastructure which manages the preferred
affinity of unbound kthreads (node or custom cpumask) against
housekeeping (CPU isolation) constraints and CPU hotplug events.
One crucial missing piece is the handling of cpuset: when an isolated
partition is created, deleted, or its CPUs updated, all the unbound
kthreads in the top cpuset become indifferently affine to _all_ the
non-isolated CPUs, possibly breaking their preferred affinity along
the way.
Solve this with performing the kthreads affinity update from cpuset to
the kthreads consolidated relevant code instead so that preferred
affinities are honoured and applied against the updated cpuset isolated
partitions.
The dispatch of the new isolated cpumasks to timers, workqueues and
kthreads is performed by housekeeping, as per the nice Tejun's
suggestion.
As a welcome side effect, HK_TYPE_DOMAIN then integrates both the set
from boot defined domain isolation (through isolcpus=) and cpuset
isolated partitions. Housekeeping cpumasks are now modifiable with a
specific RCU based synchronization. A big step toward making nohz_full=
also mutable through cpuset in the future.
Thanks!
----------------------------------------------------------------
Frederic Weisbecker (33):
PCI: Prepare to protect against concurrent isolated cpuset change
cpu: Revert "cpu/hotplug: Prevent self deadlock on CPU hot-unplug"
memcg: Prepare to protect against concurrent isolated cpuset change
mm: vmstat: Prepare to protect against concurrent isolated cpuset change
sched/isolation: Save boot defined domain flags
cpuset: Convert boot_hk_cpus to use HK_TYPE_DOMAIN_BOOT
driver core: cpu: Convert /sys/devices/system/cpu/isolated to use HK_TYPE_DOMAIN_BOOT
net: Keep ignoring isolated cpuset change
block: Protect against concurrent isolated cpuset change
timers/migration: Prevent from lockdep false positive warning
cpu: Provide lockdep check for CPU hotplug lock write-held
cpuset: Provide lockdep check for cpuset lock held
sched/isolation: Convert housekeeping cpumasks to rcu pointers
cpuset: Update HK_TYPE_DOMAIN cpumask from cpuset
sched/isolation: Flush memcg workqueues on cpuset isolated partition change
sched/isolation: Flush vmstat workqueues on cpuset isolated partition change
PCI: Flush PCI probe workqueue on cpuset isolated partition change
cpuset: Propagate cpuset isolation update to workqueue through housekeeping
cpuset: Propagate cpuset isolation update to timers through housekeeping
timers/migration: Remove superfluous cpuset isolation test
cpuset: Remove cpuset_cpu_is_isolated()
sched/isolation: Remove HK_TYPE_TICK test from cpu_is_isolated()
PCI: Remove superfluous HK_TYPE_WQ check
kthread: Refine naming of affinity related fields
kthread: Include unbound kthreads in the managed affinity list
kthread: Include kthreadd to the managed affinity list
kthread: Rely on HK_TYPE_DOMAIN for preferred affinity management
sched: Switch the fallback task allowed cpumask to HK_TYPE_DOMAIN
sched/arm64: Move fallback task cpumask to HK_TYPE_DOMAIN
kthread: Honour kthreads preferred affinity after cpuset changes
kthread: Comment on the purpose and placement of kthread_affine_node() call
kthread: Document kthread_affine_preferred()
doc: Add housekeeping documentation
Documentation/arch/arm64/asymmetric-32bit.rst | 12 +-
Documentation/core-api/housekeeping.rst | 111 ++++++++++++++++++
Documentation/core-api/index.rst | 1 +
arch/arm64/kernel/cpufeature.c | 6 +-
block/blk-mq.c | 6 +-
drivers/base/cpu.c | 2 +-
drivers/pci/pci-driver.c | 71 +++++++++---
include/linux/cpuhplock.h | 1 +
include/linux/cpuset.h | 8 +-
include/linux/kthread.h | 1 +
include/linux/memcontrol.h | 4 +
include/linux/mmu_context.h | 2 +-
include/linux/pci.h | 3 +
include/linux/percpu-rwsem.h | 1 +
include/linux/sched/isolation.h | 16 ++-
include/linux/vmstat.h | 2 +
include/linux/workqueue.h | 2 +-
init/Kconfig | 1 +
kernel/cgroup/cpuset.c | 53 +++------
kernel/cpu.c | 42 +++----
kernel/kthread.c | 160 +++++++++++++++++---------
kernel/sched/isolation.c | 145 ++++++++++++++++++-----
kernel/sched/sched.h | 4 +
kernel/time/timer_migration.c | 25 ++--
kernel/workqueue.c | 17 +--
mm/memcontrol.c | 31 ++++-
mm/vmstat.c | 15 ++-
net/core/net-sysfs.c | 2 +-
28 files changed, 538 insertions(+), 206 deletions(-)
create mode 100644 Documentation/core-api/housekeeping.rst
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