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author | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2020-10-05 13:11:17 +0200 |
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committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2020-10-05 13:11:17 +0200 |
commit | 0b9688ee95c123e2dc4449ef667abe4209e55ee4 (patch) | |
tree | 24789691fd15fd0846e9d7bad4af869be3bbd370 /Documentation/admin-guide/pm | |
parent | 1a67b9263e06688d7f683714cace8dcc203f8c55 (diff) | |
parent | f3643b5b77f26865b566c867b1aa99d1ba903cd0 (diff) | |
download | linux-stable-0b9688ee95c123e2dc4449ef667abe4209e55ee4.tar.gz linux-stable-0b9688ee95c123e2dc4449ef667abe4209e55ee4.tar.bz2 linux-stable-0b9688ee95c123e2dc4449ef667abe4209e55ee4.zip |
Merge back cpuidle material for 5.10.
* pm-cpuidle:
cpuidle: record state entry rejection statistics
cpuidle: psci: Allow PM domain to be initialized even if no OSI mode
firmware: psci: Extend psci_set_osi_mode() to allow reset to PC mode
ACPI: processor: Print more information when acpi_processor_evaluate_cst() fails
cpuidle: tegra: Correctly handle result of arm_cpuidle_simple_enter()
Diffstat (limited to 'Documentation/admin-guide/pm')
-rw-r--r-- | Documentation/admin-guide/pm/cpuidle.rst | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/Documentation/admin-guide/pm/cpuidle.rst b/Documentation/admin-guide/pm/cpuidle.rst index 6ebe163f9dfe..37940a0584ec 100644 --- a/Documentation/admin-guide/pm/cpuidle.rst +++ b/Documentation/admin-guide/pm/cpuidle.rst @@ -528,6 +528,10 @@ object corresponding to it, as follows: Total number of times the hardware has been asked by the given CPU to enter this idle state. +``rejected`` + Total number of times a request to enter this idle state on the given + CPU was rejected. + The :file:`desc` and :file:`name` files both contain strings. The difference between them is that the name is expected to be more concise, while the description may be longer and it may contain white space or special characters. @@ -572,6 +576,11 @@ particular case. For these reasons, the only reliable way to find out how much time has been spent by the hardware in different idle states supported by it is to use idle state residency counters in the hardware, if available. +Generally, an interrupt received when trying to enter an idle state causes the +idle state entry request to be rejected, in which case the ``CPUIdle`` driver +may return an error code to indicate that this was the case. The :file:`usage` +and :file:`rejected` files report the number of times the given idle state +was entered successfully or rejected, respectively. .. _cpu-pm-qos: |