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Merge tag 'docs-for-linus' of git://git.lwn.net/linux-2.6

Browse Source 
Pull documentation updates from Jonathan Corbet:
 "The main thing here is Ingo's big subdirectory documenting feature
  support for each architecture.  Beyond that, it's the usual pile of
  fixes, tweaks, and small additions"

* tag 'docs-for-linus' of git://git.lwn.net/linux-2.6: (79 commits)
  doc:md: fix typo in md.txt.
  Documentation/mic/mpssd: don't build x86 userspace when cross compiling
  Documentation/prctl: don't build tsc tests when cross compiling
  Documentation/vDSO: don't build tests when cross compiling
  Doc:ABI/testing: Fix typo in sysfs-bus-fcoe
  Doc: Docbook: Change wikipedia's URL from http to https in scsi.tmpl
  Doc: Change wikipedia's URL from http to https
  Documentation/kernel-parameters: add missing pciserial to the earlyprintk
  Doc:pps: Fix typo in pps.txt
  kbuild : Fix documentation of INSTALL_HDR_PATH
  Documentation: filesystems: updated struct file_operations documentation in vfs.txt
  kbuild: edit explanation of clean-files variable
  Doc: ja_JP: Fix typo in HOWTO
  Move freefall program from Documentation/ to tools/
  Documentation: ARM: EXYNOS: Describe boot loaders interface
  Doc:nfc: Fix typo in nfc-hci.txt
  vfs: Minor documentation fix
  Doc: networking: txtimestamp: fix printf format warning
  Documentation, intel_pstate: Improve legacy mode internal governors description
  Documentation: extend use case for EXPORT_SYMBOL_GPL()
  ...
This commit is contained in:
Linus Torvalds
2015-06-24 20:01:36 -07:00
parent 14738e0331 36f95a0b34
commit 1e467e68e5
88 changed files with 1957 additions and 79 deletions
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2
Documentation/cpu-freq/governors.txt
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@@ -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

21
Documentation/cpu-freq/intel-pstate.txt
View File

@@ -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/