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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2018-06-29 16:14:41 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-06-29 16:14:41 +0200 |
| commit | 5e4e8c55c9fca8c5e06befc16d56800773fb3128 (patch) | |
| tree | 2181eef55c7b9ab692cf133e2ec3485f38d057fb /Documentation | |
| parent | Merge tag 'drm-fixes-2018-06-29' of git://anongit.freedesktop.org/drm/drm (diff) | |
| parent | Merge branch 'pm-domains' (diff) | |
| download | linux-5e4e8c55c9fca8c5e06befc16d56800773fb3128.tar.xz linux-5e4e8c55c9fca8c5e06befc16d56800773fb3128.zip | |
Merge tag 'pm-4.18-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Pull power management fixes from Rafael Wysocki:
"These fix up recently added features (the Kryo cpufreq driver and
performance states coverage in the generic power domains framework),
add missing documentation for a recently added sysfs knob in the
intel_pstate driver and fix an error in its documentation.
Specifics:
- Fix the initialization time error handling in the recently added
Kryo cpufreq driver (Dan Carpenter).
- Fix up the recently added coverage of performance states in the
generic power domains (genpd) framework (Viresh Kumar).
- Add missing documentation of the new hwp_dynamic_boost sysfs knob
in the intel_pstate driver (Rafael Wysocki).
- Fix incorrect sysfs path in the intel_pstate driver documentation
(Rafael Wysocki)"
* tag 'pm-4.18-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
Documentation: intel_pstate: Describe hwp_dynamic_boost sysfs knob
Documentation: admin-guide: intel_pstate: Fix sysfs path
PM / Domains: Rename opp_node to np
PM / Domains: Fix return value of of_genpd_opp_to_performance_state()
cpufreq: qcom-kryo: Fix error handling in probe()
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/admin-guide/pm/intel_pstate.rst | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/Documentation/admin-guide/pm/intel_pstate.rst b/Documentation/admin-guide/pm/intel_pstate.rst index 8b9164990956..8f1d3de449b5 100644 --- a/Documentation/admin-guide/pm/intel_pstate.rst +++ b/Documentation/admin-guide/pm/intel_pstate.rst @@ -324,8 +324,7 @@ Global Attributes ``intel_pstate`` exposes several global attributes (files) in ``sysfs`` to control its functionality at the system level. They are located in the -``/sys/devices/system/cpu/cpufreq/intel_pstate/`` directory and affect all -CPUs. +``/sys/devices/system/cpu/intel_pstate/`` directory and affect all CPUs. Some of them are not present if the ``intel_pstate=per_cpu_perf_limits`` argument is passed to the kernel in the command line. @@ -379,6 +378,17 @@ argument is passed to the kernel in the command line. but it affects the maximum possible value of per-policy P-state limits (see `Interpretation of Policy Attributes`_ below for details). +``hwp_dynamic_boost`` + This attribute is only present if ``intel_pstate`` works in the + `active mode with the HWP feature enabled <Active Mode With HWP_>`_ in + the processor. If set (equal to 1), it causes the minimum P-state limit + to be increased dynamically for a short time whenever a task previously + waiting on I/O is selected to run on a given logical CPU (the purpose + of this mechanism is to improve performance). + + This setting has no effect on logical CPUs whose minimum P-state limit + is directly set to the highest non-turbo P-state or above it. + .. _status_attr: ``status`` |