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linux-6.6.y
linux/kernel/sched
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Peter Zijlstra (Intel) 51445190c1 sched/fair: Proportional newidle balance 
commit 33cf66d883 upstream.

Add a randomized algorithm that runs newidle balancing proportional to
its success rate.

This improves schbench significantly:

 6.18-rc4:			2.22 Mrps/s
 6.18-rc4+revert:		2.04 Mrps/s
 6.18-rc4+revert+random:	2.18 Mrps/S

Conversely, per Adam Li this affects SpecJBB slightly, reducing it by 1%:

 6.17:			-6%
 6.17+revert:		 0%
 6.17+revert+random:	-1%

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Tested-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Tested-by: Chris Mason <clm@meta.com>
Link: https://lkml.kernel.org/r/6825c50d-7fa7-45d8-9b81-c6e7e25738e2@meta.com
Link: https://patch.msgid.link/20251107161739.770122091@infradead.org
[ Ajay: Modified to apply on v6.6 ]
Signed-off-by: Ajay Kaher <ajay.kaher@broadcom.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2026-01-11 15:22:30 +01:00
..
autogroup.c
sched/all: Change all BUG_ON() instances in the scheduler to WARN_ON_ONCE()
2022-08-12 11:25:10 +02:00
autogroup.h
sched/headers: Add header guard to kernel/sched/stats.h and kernel/sched/autogroup.h
2022-02-23 08:22:00 +01:00
build_policy.c
sched: Fix missing prototype warnings
2022-05-01 10:03:43 +02:00
build_utility.c
sched: Fix missing prototype warnings
2022-05-01 10:03:43 +02:00
clock.c
Merge tag 'locking-core-2023-06-27' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2023-06-27 14:14:30 -07:00
completion.c
sched: add a few helpers to wake up tasks on the current cpu
2023-07-17 16:08:08 -07:00
core_sched.c
sched: Rename task_running() to task_on_cpu()
2022-09-07 21:53:47 +02:00
core.c
sched/fair: Proportional newidle balance
2026-01-11 15:22:30 +01:00
cpuacct.c
Merge branch 'sched/fast-headers' into sched/core
2022-03-15 09:05:05 +01:00
cpudeadline.c
sched/deadline: only set free_cpus for online runqueues
2026-01-11 15:21:42 +01:00
cpudeadline.h
sched/deadline: only set free_cpus for online runqueues
2026-01-11 15:21:42 +01:00
cpufreq_schedutil.c
sched/fair: Fix frequency selection for non-invariant case
2025-08-28 16:28:43 +02:00
cpufreq.c
sched/headers: Introduce kernel/sched/build_utility.c and build multiple .c files there
2022-02-23 10:58:33 +01:00
cpupri.c
sched/rt: Fix live lock between select_fallback_rq() and RT push
2023-09-28 22:58:13 +02:00
cpupri.h
sched/cpupri: Add CPUPRI_HIGHER
2020-10-29 11:00:30 +01:00
cputime.c
sched/cputime: Fix mul_u64_u64_div_u64() precision for cputime
2024-08-14 13:58:47 +02:00
deadline.c
sched/deadline: only set free_cpus for online runqueues
2026-01-11 15:21:42 +01:00
debug.c
sched/debug: Provide slice length for fair tasks
2025-03-22 12:50:40 -07:00
fair.c
sched/fair: Proportional newidle balance
2026-01-11 15:22:30 +01:00
features.h
sched/fair: Proportional newidle balance
2026-01-11 15:22:30 +01:00
idle.c
sched/fair: Rename check_preempt_curr() to wakeup_preempt()
2024-12-14 20:00:18 +01:00
isolation.c
sched/isolation: Fix boot crash when maxcpus < first housekeeping CPU
2024-06-12 11:11:24 +02:00
loadavg.c
sched: Change nr_uninterruptible type to unsigned long
2025-07-24 08:53:20 +02:00
Makefile
sched/headers: Introduce kernel/sched/build_policy.c and build multiple .c files there
2022-02-23 10:58:33 +01:00
membarrier.c
sched/membarrier: reduce the ability to hammer on sys_membarrier
2024-02-23 09:25:27 +01:00
pelt.c
sched/headers: Introduce kernel/sched/build_policy.c and build multiple .c files there
2022-02-23 10:58:33 +01:00
pelt.h
sched/fair: Decay task PELT values during wakeup migration
2022-06-28 09:17:46 +02:00
psi.c
sched/psi: Fix psi_seq initialization
2025-08-15 12:09:00 +02:00
rt.c
sched/topology: Consolidate and clean up access to a CPU's max compute capacity
2025-05-02 07:50:41 +02:00
sched-pelt.h
sched/fair: Fix "runnable_avg_yN_inv" not used warnings
2019-06-17 12:15:58 +02:00
sched.h
sched/fair: Proportional newidle balance
2026-01-11 15:22:30 +01:00
smp.h
sched, smp: Trace smp callback causing an IPI
2023-03-24 11:01:29 +01:00
stats.c
profiling: remove profile=sleep support
2024-08-14 13:58:47 +02:00
stats.h
sched: Move psi_account_irqtime() out of update_rq_clock_task() hotpath
2024-07-18 13:21:25 +02:00
stop_task.c
sched: Unify runtime accounting across classes
2024-12-14 20:00:19 +01:00
swait.c
sched: add a few helpers to wake up tasks on the current cpu
2023-07-17 16:08:08 -07:00
topology.c
sched/fair: Proportional newidle balance
2026-01-11 15:22:30 +01:00
wait_bit.c
wait_on_bit: add an acquire memory barrier
2022-08-26 09:30:25 -07:00
wait.c
sched: add a few helpers to wake up tasks on the current cpu
2023-07-17 16:08:08 -07:00