https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: ce397d215ccd07b8ae3f71db689aedb85d56ab40 authored by Linus Torvalds on 16 June 2018, 23:04:49 UTC
Linux 4.18-rc1
Linux 4.18-rc1
Tip revision: ce397d2
lpit.txt
To enumerate platform Low Power Idle states, Intel platforms are using
“Low Power Idle Table” (LPIT). More details about this table can be
downloaded from:
http://www.uefi.org/sites/default/files/resources/Intel_ACPI_Low_Power_S0_Idle.pdf
Residencies for each low power state can be read via FFH
(Function fixed hardware) or a memory mapped interface.
On platforms supporting S0ix sleep states, there can be two types of
residencies:
- CPU PKG C10 (Read via FFH interface)
- Platform Controller Hub (PCH) SLP_S0 (Read via memory mapped interface)
The following attributes are added dynamically to the cpuidle
sysfs attribute group:
/sys/devices/system/cpu/cpuidle/low_power_idle_cpu_residency_us
/sys/devices/system/cpu/cpuidle/low_power_idle_system_residency_us
The "low_power_idle_cpu_residency_us" attribute shows time spent
by the CPU package in PKG C10
The "low_power_idle_system_residency_us" attribute shows SLP_S0
residency, or system time spent with the SLP_S0# signal asserted.
This is the lowest possible system power state, achieved only when CPU is in
PKG C10 and all functional blocks in PCH are in a low power state.