* [GIT PULL] Scheduler updates for v7.4
@ 2026-10-18 10:43 Ingo Molnar
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From: Ingo Molnar @ 2026-10-18 10:43 UTC (permalink / raw)
To: Linus Torvalds
Cc: linux-kernel, Peter Zijlstra, Thomas Gleixner, Juri Lelli,
Vincent Guittot, Dietmar Eggemann, Steven Rostedt, Mel Gorman,
Tejun Heo, Valentin Schneider, Shrikanth Hegde, Andrea Righi,
Joel Fernandes, John Stultz, K Prateek Nayak
Linus,
Please pull the latest sched/core Git tree from:
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git sched-core-2026-10-18
for you to fetch changes up to b99b7f60c5b473d374c68b53753153b4aa9e0702:
Scheduler updates:
Kconfig updates:
- Simplify PREEMPT_DYNAMIC (Mark Rutland)
Fair scheduler updates:
- Remove redundant RUN_TO_PARITY check (Elif Topuz)
- Declare augmented callbacks per field, fix rb_add_augmented_cached()
descent (Yiwei Lin, Peter Zijlstra)
- Restart fair hrtick after same-task repicks (Shubhang Kaushik)
- Improve the scheduling latency of short slice tasks (Vincent Guittot)
Deadline/RT scheduler updates:
- Check start_dl_timer expiry with ktime_before()
(Liang Hao)
- irq_work: CPU-hotplug improvements on PREEMPT_RT (Sebastian Andrzej
Siewior)
Energy-aware scheduling updates:
- Implement the steal_governor, introduce preferred CPUs and
steal-driven vCPU backoff (Shrikanth Hegde)
Multi-processor load-balancing updates:
- Enable preferred SMT siblings on NVIDIA Olympus (Andrea Righi)
- Randomize equally shallow idle CPU picks (Christian Loehle)
- Remove redundant core_sched_seq (Hui Su)
Cache-aware scheduling updates:
- Avoid publishing partial LLC utilization (Jemmy Wong)
NUMA-balancing updates:
- Reset NUMA fault locality after scan period update (Eric Kim)
Proxy execution updates:
- Ongoing work to implement sleeping owner handling for proxy
execution (John Stultz, Vasily Gorbik)
- Preparatory steps to make sched_ext compatible with proxy
execution (Andrea Righi)
Scheduler infrastructure updates & fixes:
- Remove the RCU wait from PSI trigger destruction (Shakeel Butt)
- Avoid modifying wait-entry on failed priority registration
(Hui Su)
- Use the new static key API for sched_feat (Hongyan Xia)
- Convert paravirt_steal to new static key APIs (Hongyan Xia)
- cputime: Don't account idle time twice after dyntick-idle
(Stian Halseth)
Scheduler debugging updates:
- Set TIF_NEED_RESCHED before calling __trace_set_need_resched()
(Sechang Lim)
- Fix context analysis errors in non-preferred CPU push (Shrikanth
Hegde)
Misc cleanups and fixes by Christian Loehle, Shubhang Kaushik,
Thomas Huth and Vladimir Zapolskiy.
Thanks,
Ingo
------------------>
Andrea Righi (7):
sched/core: Drop mutex locks before proxy rescheduling
sched/core: Dequeue waking proxy donors before reset
sched/core: Mark wakeups completed through ttwu_runnable()
sched: Add helper to block retained proxy donors
sched: Add sched_ext hooks for proxy execution
sched/fair: Honor asymmetric SMT priority in idle selection
sched/topology: Add asymmetric SMT packing override
Christian Loehle (3):
sched/fair: Drop idle recency from slow-path CPU selection
sched/fair: Randomize equally shallow slow-path candidates
sched: Replace nr_iowait_cpu() with a bool accessor
Elif Topuz (1):
sched/eevdf: Remove redundant RUN_TO_PARITY check
Eric Kim (1):
sched/fair: Reset NUMA fault locality after scan period update
Hongyan Xia (2):
sched: Convert paravirt_steal to new static key APIs
sched/feat: Use the new static key API for sched_feat
Hui Su (2):
sched/core: Remove redundant core_sched_seq
sched/wait: Avoid modifying entry on failed priority registration
Jemmy Wong (1):
sched/cache: Avoid publishing partial LLC utilization
John Stultz (4):
sched/core: Avoid migrating blocked_on tasks
sched: Switch rq->next_class in proxy_reset_donor()
sched: Break out core of attach_tasks() helper into sched.h
sched: Migrate whole chain in proxy_migrate_task()
Kayra Cizmeci (2):
sched/fair: Remove dead code on enqueue_task_fair()
Revert "sched/fair: Remove dead code on enqueue_task_fair()"
Liang Hao (1):
sched/deadline: check start_dl_timer expiry with ktime_before()
Mark Rutland (7):
sched: dynamic: Make PREEMPT_DYNAMIC depend on ARCH_HAS_PREEMPT_LAZY
sched: dynamic: Simplify {cond,might}_resched()
sched: dynamic: Simplify preempt_schedule{,_notrace}()
sched: dynamic: Simplify irqentry_exit_cond_resched()
sched: dynamic: Remove HAVE_PREEMPT_DYNAMIC_{CALL,KEY}
sched: dynamic: Simplify preempt model accessors
sched: dynamic: Fix preemption model strings
Peter Zijlstra (Intel) (1):
rbtree: Declare augmented callbacks per field with RB_AUG()
Sebastian Andrzej Siewior (3):
irq_work: Update a comment regarding CPU hotplug invocation
irq_work: Flush lazy work CPU down on PREEMPT_RT
smpboot: Don't park the thread if work is pending
Sechang Lim (1):
sched: Set TIF_NEED_RESCHED before calling __trace_set_need_resched()
Shakeel Butt (1):
sched/psi: Remove the RCU wait from trigger destruction
Shrikanth Hegde (14):
sched/cputime: Add kcpustat_field_total helper
cpumask: Introduce cpumask_intersects_and
sched/docs: Document cpu_preferred_mask and Preferred CPU concept
cpumask: Introduce cpu_preferred_mask
sysfs: Add preferred CPU file
sched/core: Try to use a preferred CPU in is_cpu_allowed
sched/fair: Load balance only among preferred CPUs
sched/core: Push current task from non preferred CPU
sched/debug: Add migration stats due to non preferred CPUs
virt: Introduce steal governor driver
virt/steal_governor: Add control knobs for handling steal values
virt/steal_governor: Implement steal_governor policy loop
virt/steal_governor: Enable the driver
sched/core: Fix context analysis errors in non-preferred CPU push
Shubhang Kaushik (Ampere) (2):
sched: Restart fair hrtick after same-task repicks
sched/wait: Clarify WF_SYNC wakeup semantics
Stian Halseth (1):
sched/cputime: Don't account idle time twice after dyntick-idle
Thomas Huth (1):
sched/headers: Replace __ASSEMBLY__ with __ASSEMBLER__ in the <uapi/linux/sched.h> header
Vasily Gorbik (2):
sched/core: Don't steal a proxy-exec donor
sched/core: Don't proxy-exec unmatched cookie lock owners
Vincent Guittot (3):
sched/eevdf: Ensure that vprot will never go above a min slice
sched/eevdf: Align update_protect_slice to set_protect_slice
sched/eevdf: Handle more short slice waking cases
Vladimir Zapolskiy (1):
sched: Remove unneeded function type cast in do_balance_callbacks()
Yiwei Lin (3):
rbtree_test: Use rb_add() and rb_add_cached() for the basic tests
rbtree: Update augmented data on the way down in rb_add_augmented_cached()
rbtree_test: Use rb_add_augmented_cached() for the cached augmented test
Documentation/ABI/testing/sysfs-devices-system-cpu | 14 +
Documentation/admin-guide/kernel-parameters.txt | 12 +
Documentation/core-api/rbtree.rst | 27 +-
Documentation/driver-api/index.rst | 1 +
Documentation/driver-api/steal-governor.rst | 151 +++++++
Documentation/scheduler/index.rst | 1 +
Documentation/scheduler/sched-paravirt.rst | 67 +++
MAINTAINERS | 9 +
arch/Kconfig | 38 --
arch/arm64/Kconfig | 1 -
arch/arm64/include/asm/preempt.h | 10 -
arch/arm64/kernel/paravirt.c | 4 +-
arch/loongarch/Kconfig | 1 -
arch/loongarch/kernel/paravirt.c | 4 +-
arch/powerpc/Kconfig | 1 -
arch/powerpc/platforms/pseries/setup.c | 4 +-
arch/riscv/Kconfig | 1 -
arch/riscv/kernel/paravirt.c | 4 +-
arch/s390/Kconfig | 1 -
arch/s390/include/asm/preempt.h | 11 -
arch/s390/kernel/hiperdispatch.c | 10 +-
arch/s390/kernel/idle.c | 4 +-
arch/x86/Kconfig | 1 -
arch/x86/include/asm/preempt.h | 28 --
arch/x86/kernel/cpu/vmware.c | 4 +-
arch/x86/kernel/kvm.c | 4 +-
drivers/base/cpu.c | 12 +
drivers/virt/Kconfig | 17 +
drivers/virt/Makefile | 1 +
drivers/virt/steal_governor.c | 296 +++++++++++++
drivers/xen/time.c | 4 +-
fs/proc/uptime.c | 6 +-
include/asm-generic/preempt.h | 10 -
include/linux/bitmap.h | 14 +
include/linux/cpumask.h | 42 ++
include/linux/irq-entry-common.h | 17 +-
include/linux/irq_work.h | 2 +
include/linux/kernel.h | 20 -
include/linux/kernel_stat.h | 18 +-
include/linux/preempt.h | 20 +-
include/linux/rbtree_augmented.h | 201 ++++++---
include/linux/sched.h | 37 +-
include/linux/sched/cputime.h | 6 +-
include/linux/sched/stat.h | 2 +-
include/uapi/linux/sched.h | 2 +-
kernel/Kconfig.preempt | 13 +-
kernel/cpu.c | 6 +
kernel/entry/common.c | 17 +-
kernel/irq_work.c | 16 +-
kernel/sched/core.c | 464 +++++++++++----------
kernel/sched/cputime.c | 63 ++-
kernel/sched/deadline.c | 9 +-
kernel/sched/debug.c | 21 +-
kernel/sched/ext/ext.c | 18 +-
kernel/sched/ext/ext.h | 7 +
kernel/sched/fair.c | 279 +++++++------
kernel/sched/idle.c | 5 +-
kernel/sched/psi.c | 25 +-
kernel/sched/rt.c | 7 +-
kernel/sched/sched.h | 80 +++-
kernel/sched/stop_task.c | 5 +-
kernel/sched/topology.c | 18 +
kernel/sched/wait.c | 25 +-
kernel/smp.c | 1 +
kernel/smpboot.c | 6 +-
kernel/time/tick-sched.c | 22 +-
lib/bitmap.c | 17 +
lib/rbtree_test.c | 62 +--
tools/perf/trace/beauty/include/uapi/linux/sched.h | 2 +-
69 files changed, 1513 insertions(+), 815 deletions(-)
create mode 100644 Documentation/driver-api/steal-governor.rst
create mode 100644 Documentation/scheduler/sched-paravirt.rst
create mode 100644 drivers/virt/steal_governor.c
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