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There are two idle injection implementation in the Linux kernel. One via intel_powerclamp and the other using powercap/idle_inject. Both implementation end up in calling play_idle* function from a FIFO priority thread. Both can't be used at the same time. It is better to use one idle injection framework for better maintainability. In this way, there is only one caller for play_idle. Here powercap/idle_inject can be used for both per-core and for system wide idle injection. This framework has a well defined interface which allow registry for per-core or for all CPUs (system wide). This reduces code complexity in the intel powerclamp driver as all the per CPU kthreads, delayed work and calls to play_idle can be removed. The changes include: - Remove unneeded include files - Remove per CPU kthread workers: balancing_work and idle_injection_work. - Reuse the compensation related code by moving from previous worker thread to idle_injection callback. - Adjust the idle_duration and runtime by using powercap/idle_inject interface. - Remove all variables, which are not required once powercap/idle_inject is used. - Add mutex to avoid race during removal of idle injection during module unload and user action to change idle inject percent. Also for protection during dynamic adjustment of run and idle time from update() callback. - Remove online/offline callbacks to designate control CPU - Use cpu_present_mask global variable for CPU mask - Remove hot plug locks Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.