From f4fd3797848aa04e72e942c855fd279840a47fe4 Mon Sep 17 00:00:00 2001 From: Lan Tianyu Date: Thu, 27 Jun 2013 15:08:54 +0800 Subject: acpi-cpufreq: Add new sysfs attribute freqdomain_cpus Commits fcf8058 (cpufreq: Simplify cpufreq_add_dev()) and aa77a52 (cpufreq: acpi-cpufreq: Don't set policy->related_cpus from .init()) changed the contents of the "related_cpus" sysfs attribute on systems where acpi-cpufreq is used and user space can't get the list of CPUs which are in the same hardware coordination CPU domain (provided by the ACPI AML method _PSD) via "related_cpus" any more. To make up for that loss add a new sysfs attribute "freqdomian_cpus" for the acpi-cpufreq driver which exposes the list of CPUs in the same domain regardless of whether it is coordinated by hardware or software. [rjw: Changelog, documentation] References: https://bugzilla.kernel.org/show_bug.cgi?id=58761 Reported-by: Jean-Philippe Halimi Signed-off-by: Lan Tianyu Acked-by: Viresh Kumar Signed-off-by: Rafael J. Wysocki --- Documentation/ABI/testing/sysfs-devices-system-cpu | 15 +++++++++++++++ 1 file changed, 15 insertions(+) (limited to 'Documentation/ABI/testing') diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu b/Documentation/ABI/testing/sysfs-devices-system-cpu index 2447698aed41..468e4d48f884 100644 --- a/Documentation/ABI/testing/sysfs-devices-system-cpu +++ b/Documentation/ABI/testing/sysfs-devices-system-cpu @@ -144,6 +144,21 @@ Description: Discover and change clock speed of CPUs to learn how to control the knobs. +What: /sys/devices/system/cpu/cpu#/cpufreq/freqdomain_cpus +Date: June 2013 +Contact: cpufreq@vger.kernel.org +Description: Discover CPUs in the same CPU frequency coordination domain + + freqdomain_cpus is the list of CPUs (online+offline) that share + the same clock/freq domain (possibly at the hardware level). + That information may be hidden from the cpufreq core and the + value of related_cpus may be different from freqdomain_cpus. This + attribute is useful for user space DVFS controllers to get better + power/performance results for platforms using acpi-cpufreq. + + This file is only present if the acpi-cpufreq driver is in use. + + What: /sys/devices/system/cpu/cpu*/cache/index3/cache_disable_{0,1} Date: August 2008 KernelVersion: 2.6.27 -- cgit v1.2.3