Rafael J. Wysocki fa3fa55de0 cpuidle: governors: menu: Avoid using invalid recent intervals data ... Marc has reported that commit 85975daeaa ("cpuidle: menu: Avoid discarding useful information") caused the number of wakeup interrupts to increase on an idle system [1], which was not expected to happen after merely allowing shallower idle states to be selected by the governor in some cases. However, on the system in question, all of the idle states deeper than WFI are rejected by the driver due to a firmware issue [2]. This causes the governor to only consider the recent interval duriation data corresponding to attempts to enter WFI that are successful and the recent invervals table is filled with values lower than the scheduler tick period. Consequently, the governor predicts an idle duration below the scheduler tick period length and avoids stopping the tick more often which leads to the observed symptom. Address it by modifying the governor to update the recent intervals table also when entering the previously selected idle state fails, so it knows that the short idle intervals might have been the minority had the selected idle states been actually entered every time. Fixes: 85975daeaa ("cpuidle: menu: Avoid discarding useful information") Link: https://lore.kernel.org/linux-pm/86o6sv6n94.wl-maz@kernel.org/ [1] Link: https://lore.kernel.org/linux-pm/7ffcb716-9a1b-48c2-aaa4-469d0df7c792@arm.com/ [2] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Tested-by: Christian Loehle <christian.loehle@arm.com> Tested-by: Marc Zyngier <maz@kernel.org> Reviewed-by: Christian Loehle <christian.loehle@arm.com> Link: https://patch.msgid.link/2793874.mvXUDI8C0e@rafael.j.wysocki		2025-08-11 21:46:14 +02:00
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governors	cpuidle: governors: menu: Avoid using invalid recent intervals data	2025-08-11 21:46:14 +02:00
coupled.c
cpuidle-arm.c
cpuidle-at91.c
cpuidle-big_little.c
cpuidle-calxeda.c
cpuidle-clps711x.c
cpuidle-cps.c
cpuidle-exynos.c
cpuidle-haltpoll.c
cpuidle-kirkwood.c
cpuidle-mvebu-v7.c
cpuidle-powernv.c
cpuidle-psci-domain.c	cpuidle: psci: Drop redundant sync_state support	2025-07-09 13:30:01 +02:00
cpuidle-psci.c	cpuidle: psci: Fix cpuhotplug routine with PREEMPT_RT=y	2025-07-14 13:09:04 +02:00
cpuidle-psci.h
cpuidle-pseries.c
cpuidle-qcom-spm.c
cpuidle-riscv-sbi.c	cpuidle: riscv-sbi: Drop redundant sync_state support	2025-07-09 13:30:06 +02:00
cpuidle-tegra.c
cpuidle-ux500.c
cpuidle-zynq.c
cpuidle.c
cpuidle.h
driver.c
dt_idle_genpd.c
dt_idle_genpd.h
dt_idle_states.c	cpuidle: dt: fix opencoded for_each_cpu() in idle_state_valid()	2025-07-10 14:53:28 +02:00
dt_idle_states.h
governor.c
Kconfig
Kconfig.arm
Kconfig.mips
Kconfig.powerpc
Kconfig.riscv
Makefile
poll_state.c
sysfs.c