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On some systems CPUs sometimes remain idle for several seconds. If a trace capture begins during one of these long idle periods, that CPU's idle state is unknown (in practice it is probably in its deepest available state from cpuidle's perspective but that can't be known for sure). The solution to the equivalent problem for cpufreq is to read the current frequencies from sysfs and inject artificial cpu_frequency events using trace_marker (see cpu_freq_trace_all_frequencies in bin/scripts/shutils.in). However we can't read the current idle state from sysfs. Instead, wake up each CPU by executing the "true" command on it via taskset.
devlib
======
``devlib`` exposes an interface for interacting with and collecting
measurements from a variety of devices (such as mobile phones, tablets and
development boards) running a Linux-based operating system.
Installation
------------
::
sudo -H pip install devlib
Usage
-----
Please refer to the "Overview" section of the documentation.
License
-------
This package is distributed under `Apache v2.0 License <http://www.apache.org/licenses/LICENSE-2.0>`_.
Feedback, Contrubutions and Support
-----------------------------------
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feedback.
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- We welcome code contributions via GitHub Pull requests. Please try to
stick to the style in the rest of the code for your contributions.