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| author |   Jiri Kosina <jkosina@suse.cz> | 2018-08-20 18:05:17 +0200 |
|---|---|---|
| committer | Jiri Kosina <jkosina@suse.cz> | 2018-08-20 18:05:17 +0200 |
| commit | 415d2b3392d7a80903e0f97f051201aa02bf20e9 (patch) | |
| tree | 47492d2386a0e7f00ef645313cb44ae4960b7e7e /Documentation/admin-guide/pm/intel_pstate.rst | |
| parent | HID: hiddev: fix potential Spectre v1 (diff) | |
| parent | HID: cougar: Add support for the Cougar 500k Gaming Keyboard (diff) | |
| download | linux-dev-415d2b3392d7a80903e0f97f051201aa02bf20e9.tar.xz linux-dev-415d2b3392d7a80903e0f97f051201aa02bf20e9.zip | |
Merge branch 'for-4.19/cougar' into for-linus
New device support for hid-cougar
Diffstat (limited to 'Documentation/admin-guide/pm/intel_pstate.rst')
| -rw-r--r-- | Documentation/admin-guide/pm/intel_pstate.rst | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/Documentation/admin-guide/pm/intel_pstate.rst b/Documentation/admin-guide/pm/intel_pstate.rst index ab2fe0eda1d7..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`` @@ -410,7 +420,7 @@ argument is passed to the kernel in the command line. That only is supported in some configurations, though (for example, if the `HWP feature is enabled in the processor <Active Mode With HWP_>`_, the operation mode of the driver cannot be changed), and if it is not - supported in the current configuration, writes to this attribute with + supported in the current configuration, writes to this attribute will fail with an appropriate error. Interpretation of Policy Attributes |