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be0e54c4eb
Linux 4.15 exports the ACPI Low Power Idle Table's counters in /sys/devices/system/cpu/cpuidle/ low_power_idle_cpu_residency_us Show this in the "CPU%LPI" column. Today this reflects the "North Complex" residency in PC10, so expect it to closely follow "Pk%pc10". low_power_idle_system_residency_us Show this in the "SYS%LPI" column. Today, this reflects the North is in PC10, plus the PCH is sufficiently quiescent to save additional power via the "S0ix" system state, as measured by the PCH SLP_S0 counter. Signed-off-by: Len Brown <len.brown@intel.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.