Hongyan Xia 66f21eecda sched/fair: Fix cpu_util runnable_avg arithmetic ...

[ Upstream commit 29922fdfc2 ]

If we take runnable_avg in max(runnable_avg, util_avg) in cpu_util(), we
should then add or subtract task runnable_avg, but the arithmetic below
is still with task util_avg. This mixes runnable_avg with util_avg which
is incorrect.

Fix by always doing arithmetic with runnable_avg and only take
max(runnable_avg, util_avg) at the last step.

Fixes: 7d0583cf9e ("sched/fair, cpufreq: Introduce 'runnable boosting'")
Signed-off-by: Hongyan Xia <hongyan.xia@transsion.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Vincent Guittot <vincent.guittot@linaro.org>
Link: https://patch.msgid.link/20260605094318.37931-1-hongyan.xia@transsion.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

2026-07-24 16:03:08 +02:00

..

autogroup.c

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autogroup.h

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build_policy.c

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build_utility.c

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clock.c

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completion.c

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core_sched.c

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core.c

sched: restore timer_slack_ns when resetting RT policy on fork

2026-07-24 16:03:06 +02:00

cpuacct.c

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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

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cpupri.c

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cpupri.h

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cputime.c

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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: Fix cpu_util runnable_avg arithmetic

2026-07-24 16:03:08 +02:00

features.h

sched/rt: Have RT_PUSH_IPI be default off for non PREEMPT_RT

2026-07-24 16:02:48 +02:00

idle.c

sched: idle: Consolidate the handling of two special cases

2026-03-25 11:06:07 +01:00

isolation.c

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loadavg.c

sched: Change nr_uninterruptible type to unsigned long

2025-07-24 08:53:20 +02:00

Makefile

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membarrier.c

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pelt.c

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pelt.h

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psi.c

sched/psi: Fix psi_seq initialization

2025-08-15 12:09:00 +02:00

rt.c

sched: Use u64 for bandwidth ratio calculations

2026-05-17 17:13:49 +02:00

sched-pelt.h

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sched.h

sched: Use u64 for bandwidth ratio calculations

2026-05-17 17:13:49 +02:00

smp.h

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stats.c

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stats.h

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stop_task.c

sched: Unify runtime accounting across classes

2024-12-14 20:00:19 +01:00

swait.c

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topology.c

sched/fair: Proportional newidle balance

2026-01-11 15:22:30 +01:00

wait_bit.c

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wait.c

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