linux/drivers/cpuidle
Parshuram Sangle 496d0a6485 cpuidle: haltpoll: do not shrink guest poll_limit_ns below grow_start
While adjusting guest halt poll limit, grow block starts at
guest_halt_poll_grow_start without taking intermediate values.
Similar behavior is expected while shrinking the value. This
avoids short interval values which are really not required.

VCPU1 trace (guest_halt_poll_shrink equals 2):

VCPU1 grow 10000
VCPU1 shrink 5000
VCPU1 shrink 2500
VCPU1 shrink 1250
VCPU1 shrink 625
VCPU1 shrink 312
VCPU1 shrink 156
VCPU1 shrink 78
VCPU1 shrink 39
VCPU1 shrink 19
VCPU1 shrink 9
VCPU1 shrink 4

Similar change is done in KVM halt poll flow with below patch:
Link: https://lore.kernel.org/kvm/20211006133021.271905-3-sashal@kernel.org/

Co-developed-by: Rajendran Jaishankar <jaishankar.rajendran@intel.com>
Signed-off-by: Rajendran Jaishankar <jaishankar.rajendran@intel.com>
Signed-off-by: Parshuram Sangle <parshuram.sangle@intel.com>
Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com>
[ rjw: Subject edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2024-02-12 17:02:51 +01:00
..
governors cpuidle: haltpoll: do not shrink guest poll_limit_ns below grow_start 2024-02-12 17:02:51 +01:00
coupled.c cpuidle: coupled: Drop duplicate word from a comment 2022-08-31 20:54:01 +02:00
cpuidle-arm.c cpuidle, arch: Mark all ct_cpuidle_enter() callers __cpuidle 2023-01-13 11:48:17 +01:00
cpuidle-at91.c treewide: Replace GPLv2 boilerplate/reference with SPDX - gpl-2.0_56.RULE (part 2) 2022-06-10 14:51:35 +02:00
cpuidle-big_little.c cpuidle, arch: Mark all ct_cpuidle_enter() callers __cpuidle 2023-01-13 11:48:17 +01:00
cpuidle-calxeda.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 201 2019-05-30 11:29:52 -07:00
cpuidle-clps711x.c cpuidle: clps711x: convert to devm_platform_ioremap_resource() 2019-12-20 10:04:27 +01:00
cpuidle-cps.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
cpuidle-exynos.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
cpuidle-haltpoll.c cpuidle: haltpoll: Do not enable interrupts when entering idle 2023-12-29 18:08:18 +01:00
cpuidle-kirkwood.c treewide: Replace GPLv2 boilerplate/reference with SPDX - gpl-2.0_56.RULE (part 2) 2022-06-10 14:51:35 +02:00
cpuidle-mvebu-v7.c cpuidle: mvebu: Fix duplicate flags assignment 2023-01-18 12:03:54 +01:00
cpuidle-powernv.c powerpc/cpuidle: Set CPUIDLE_FLAG_POLLING for snooze state 2022-12-06 23:18:19 +11:00
cpuidle-psci-domain.c cpuidle: psci: Move enabling OSI mode after power domains creation 2023-08-08 16:07:01 +02:00
cpuidle-psci.c cpuidle: Adjust includes to remove of_device.h 2023-04-13 17:46:35 -05:00
cpuidle-psci.h cpuidle: Factor-out power domain related code from PSCI domain driver 2022-03-10 09:29:44 -08:00
cpuidle-pseries.c powerpc/pseries: Rework lppaca_shared_proc() to avoid DEBUG_PREEMPT 2023-08-24 22:33:17 +10:00
cpuidle-qcom-spm.c cpuidle: Adjust includes to remove of_device.h 2023-04-13 17:46:35 -05:00
cpuidle-riscv-sbi.c RISC-V: Align SBI probe implementation with spec 2023-04-29 13:04:50 -07:00
cpuidle-tegra.c cpuidle, arch: Mark all ct_cpuidle_enter() callers __cpuidle 2023-01-13 11:48:17 +01:00
cpuidle-ux500.c mfd/cpuidle: ux500: Rename driver symbol 2021-08-16 13:42:34 +01:00
cpuidle-zynq.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 201 2019-05-30 11:29:52 -07:00
cpuidle.c cpuidle: Use local_clock_noinstr() 2023-06-05 21:11:09 +02:00
cpuidle.h cpuidle: move to use bus_get_dev_root() 2023-03-22 20:25:23 +01:00
driver.c cpuidle: driver: Update microsecond values of state parameters as needed 2023-02-13 16:08:44 +01:00
dt_idle_genpd.c cpuidle: dt_idle_genpd: Add helper function to remove genpd topology 2023-08-08 16:06:20 +02:00
dt_idle_genpd.h cpuidle: dt_idle_genpd: Add helper function to remove genpd topology 2023-08-08 16:06:20 +02:00
dt_idle_states.c cpuidle: dt: Replace deprecated strncpy() with strscpy() 2023-09-29 14:48:31 -07:00
dt_idle_states.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
governor.c cpuidle: Remove redundant check in cpuidle_switch_governor() 2022-09-03 20:14:51 +02:00
Kconfig cpuidle-haltpoll: select haltpoll governor 2023-01-13 20:50:46 +01:00
Kconfig.arm cpuidle: psci: Do not suspend topology CPUs on PREEMPT_RT 2023-02-13 17:15:42 +01:00
Kconfig.mips treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
Kconfig.powerpc treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
Kconfig.riscv cpuidle: Add RISC-V SBI CPU idle driver 2022-03-10 09:29:51 -08:00
Makefile cpuidle: Add RISC-V SBI CPU idle driver 2022-03-10 09:29:51 -08:00
poll_state.c cpuidle: Use local_clock_noinstr() 2023-06-05 21:11:09 +02:00
sysfs.c cpuidle: move to use bus_get_dev_root() 2023-03-22 20:25:23 +01:00