linux.git/Documentation/cpu-freq, branch v4.8

cpufreq-stats: Minor documentation fix

2016-09-08T21:05:07+00:00

The cpufreq-stats code can no longer be built as a module, so it now
appears with square brackets in menuconfig.

Signed-off-by: Jean Delvare 
Fixes: 1aefc75b2449 (cpufreq: stats: Make the stats code non-modular)
Acked-by: Viresh Kumar 
Signed-off-by: Rafael J. Wysocki

Revert "cpufreq: pcc-cpufreq: update default value of cpuinfo_transition_latency"

2016-07-22T21:51:06+00:00

This reverts commit 790d849bf811a8ab5d4cd2cce0f6fda92f6aebf2.

Using a v4.7-rc7 kernel on a HP ProLiant triggered following messages

 pcc-cpufreq: (v1.10.00) driver loaded with frequency limits: 1200 MHz, 2800 MHz
 cpufreq: ondemand governor failed, too long transition latency of HW, fallback to performance governor

The last line was shown for each CPU in the system.
Testing v4.5 (where commit 790d849b was integrated) triggered
similar messages. Same behaviour on a 2nd HP Proliant system.

So commit 790d849bf (cpufreq: pcc-cpufreq: update default value of
cpuinfo_transition_latency) causes the system to use performance
governor which, I guess, was not the intention of the patch.

Enabling debug output in pcc-cpufreq provides following verbose output:

 pcc-cpufreq: (v1.10.00) driver loaded with frequency limits: 1200 MHz, 2800 MHz
 pcc_get_offset: for CPU 0: pcc_cpu_data input_offset: 0x44, pcc_cpu_data output_offset: 0x48
 init: policy->max is 2800000, policy->min is 1200000
 get: get_freq for CPU 0
 get: SUCCESS: (virtual) output_offset for cpu 0 is 0xffffc9000d7c0048, contains a value of: 0xff06. Speed is: 168000 MHz
 cpufreq: ondemand governor failed, too long transition latency of HW, fallback to performance governor
 target: CPU 0 should go to target freq: 2800000 (virtual) input_offset is 0xffffc9000d7c0044
 target: was SUCCESSFUL for cpu 0

I am asking to revert 790d849bf to re-enable usage of ondemand
governor with pcc-cpufreq.

Fixes: 790d849bf (cpufreq: pcc-cpufreq: update default value of cpuinfo_transition_latency)
CC:  # 4.5+
Signed-off-by: Andreas Herrmann 
Signed-off-by: Rafael J. Wysocki

cpufreq: Return index from cpufreq_frequency_table_target()

2016-06-08T22:58:06+00:00

This routine can't fail unless the frequency table is invalid and
doesn't contain any valid entries.

Make it return the index and WARN() in case it is used for an invalid
table.

Signed-off-by: Viresh Kumar 
Signed-off-by: Rafael J. Wysocki

cpufreq: Drop freq-table param to cpufreq_frequency_table_target()

2016-06-08T22:58:06+00:00

The policy already has this pointer set, use it instead.

Signed-off-by: Viresh Kumar 
Signed-off-by: Rafael J. Wysocki

cpufreq: Unexport cpufreq_frequency_table_cpuinfo()

2016-06-02T21:24:41+00:00

All cpufreq drivers with a freq-table are migrated to use
cpufreq_table_validate_and_show() long back and the routine
cpufreq_frequency_table_cpuinfo() isn't used outside of cpufreq core
now.

Unexport it and update Documentation as well.

Signed-off-by: Viresh Kumar 
Signed-off-by: Rafael J. Wysocki

Documentation: cpufreq: intel_pstate: fix typo

2016-02-18T19:31:53+00:00

This just swaps a colon for a quote in the intel_pstate documentation.

Signed-off-by: Felipe Franciosi 
Signed-off-by: Rafael J. Wysocki

Documentation: cpufreq: intel_pstate: enhance documentation

2016-01-05T12:47:37+00:00

This is an attempt to make documentation more user friendly.

Signed-off-by: Srinivas Pandruvada 
Reviewed-by: Doug Smythies 
Reviewed-by: Chen, Yu C 
Signed-off-by: Rafael J. Wysocki

cpufreq: pcc-cpufreq: update default value of cpuinfo_transition_latency

2015-12-09T23:17:03+00:00

The cpufreq documentation specifies

policy->cpuinfo.transition_latency   the time it takes on this CPU to
                                switch between two frequencies in
                                nanoseconds (if appropriate, else
                                specify CPUFREQ_ETERNAL)

currently pcc-cpufreq does not expose the value and sets it to zero. I
changed the pcc-cpufreq driver and it's documentation to conform to the
default value specified in Documentation/cpu-freq/cpu-drivers.txt

Signed-off-by: Jacob Tanenbaum 
Acked-by: Viresh Kumar 
Signed-off-by: Rafael J. Wysocki

cpufreq: remove redundant CPUFREQ_INCOMPATIBLE notifier event

2015-09-01T13:50:38+00:00

What's being done from CPUFREQ_INCOMPATIBLE, can also be done with
CPUFREQ_ADJUST. There is nothing special with CPUFREQ_INCOMPATIBLE
notifier.

Kill CPUFREQ_INCOMPATIBLE and fix its usage sites.

This also updates the numbering of notifier events to remove holes.

Signed-off-by: Viresh Kumar 
Signed-off-by: Rafael J. Wysocki

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

2015-06-25T03:01:36+00:00

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()
  ...