diff options
Diffstat (limited to 'kernel/Documentation/cpu-freq')
| -rw-r--r-- | kernel/Documentation/cpu-freq/core.txt | 7 | ||||
| -rw-r--r-- | kernel/Documentation/cpu-freq/governors.txt | 2 | ||||
| -rw-r--r-- | kernel/Documentation/cpu-freq/intel-pstate.txt | 21 | ||||
| -rw-r--r-- | kernel/Documentation/cpu-freq/user-guide.txt | 2 |
4 files changed, 14 insertions, 18 deletions
diff --git a/kernel/Documentation/cpu-freq/core.txt b/kernel/Documentation/cpu-freq/core.txt index 70933eadc..ba78e7c2a 100644 --- a/kernel/Documentation/cpu-freq/core.txt +++ b/kernel/Documentation/cpu-freq/core.txt @@ -55,16 +55,13 @@ transition notifiers. ---------------------------- These are notified when a new policy is intended to be set. Each -CPUFreq policy notifier is called three times for a policy transition: +CPUFreq policy notifier is called twice for a policy transition: 1.) During CPUFREQ_ADJUST all CPUFreq notifiers may change the limit if they see a need for this - may it be thermal considerations or hardware limitations. -2.) During CPUFREQ_INCOMPATIBLE only changes may be done in order to avoid - hardware failure. - -3.) And during CPUFREQ_NOTIFY all notifiers are informed of the new policy +2.) And during CPUFREQ_NOTIFY all notifiers are informed of the new policy - if two hardware drivers failed to agree on a new policy before this stage, the incompatible hardware shall be shut down, and the user informed of this. diff --git a/kernel/Documentation/cpu-freq/governors.txt b/kernel/Documentation/cpu-freq/governors.txt index 77ec21574..c15aa75f5 100644 --- a/kernel/Documentation/cpu-freq/governors.txt +++ b/kernel/Documentation/cpu-freq/governors.txt @@ -36,7 +36,7 @@ Contents: 1. What Is A CPUFreq Governor? ============================== -Most cpufreq drivers (in fact, all except one, longrun) or even most +Most cpufreq drivers (except the intel_pstate and longrun) or even most cpu frequency scaling algorithms only offer the CPU to be set to one frequency. In order to offer dynamic frequency scaling, the cpufreq core must be able to tell these drivers of a "target frequency". So diff --git a/kernel/Documentation/cpu-freq/intel-pstate.txt b/kernel/Documentation/cpu-freq/intel-pstate.txt index 655750743..be8d4006b 100644 --- a/kernel/Documentation/cpu-freq/intel-pstate.txt +++ b/kernel/Documentation/cpu-freq/intel-pstate.txt @@ -3,24 +3,25 @@ Intel P-state driver This driver provides an interface to control the P state selection for SandyBridge+ Intel processors. The driver can operate two different -modes based on the processor model legacy and Hardware P state (HWP) +modes based on the processor model, legacy mode and Hardware P state (HWP) mode. -In legacy mode the driver implements a scaling driver with an internal -governor for Intel Core processors. The driver follows the same model -as the Transmeta scaling driver (longrun.c) and implements the -setpolicy() instead of target(). Scaling drivers that implement -setpolicy() are assumed to implement internal governors by the cpufreq -core. All the logic for selecting the current P state is contained -within the driver; no external governor is used by the cpufreq core. +In legacy mode, the Intel P-state implements two internal governors, +performance and powersave, that differ from the general cpufreq governors of +the same name (the general cpufreq governors implement target(), whereas the +internal Intel P-state governors implement setpolicy()). The internal +performance governor sets the max_perf_pct and min_perf_pct to 100; that is, +the governor selects the highest available P state to maximize the performance +of the core. The internal powersave governor selects the appropriate P state +based on the current load on the CPU. In HWP mode P state selection is implemented in the processor itself. The driver provides the interfaces between the cpufreq core and the processor to control P state selection based on user preferences and reporting frequency to the cpufreq core. In this mode the -internal governor code is disabled. +internal Intel P-state governor code is disabled. -In addtion to the interfaces provided by the cpufreq core for +In addition to the interfaces provided by the cpufreq core for controlling frequency the driver provides sysfs files for controlling P state selection. These files have been added to /sys/devices/system/cpu/intel_pstate/ diff --git a/kernel/Documentation/cpu-freq/user-guide.txt b/kernel/Documentation/cpu-freq/user-guide.txt index ff2f28332..109e97bba 100644 --- a/kernel/Documentation/cpu-freq/user-guide.txt +++ b/kernel/Documentation/cpu-freq/user-guide.txt @@ -196,8 +196,6 @@ affected_cpus : List of Online CPUs that require software related_cpus : List of Online + Offline CPUs that need software coordination of frequency. -scaling_driver : Hardware driver for cpufreq. - scaling_cur_freq : Current frequency of the CPU as determined by the governor and cpufreq core, in KHz. This is the frequency the kernel thinks the CPU runs |