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Wednesday, November 7 • 1:50pm - 2:35pm
Generic PM Domains And Device PM QoS - Rafael J. Wysocki, Intel OTC

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If there are hierarchical power domains in the system, it may take a relatively long time to resume an I/O device after it has been put into a low-power state.  Therefore, to use runtime power management (runtime PM) and keep the system responsive at the same time, one has to specify constraints on the deepest low-power states to put devices into.  Such constraints may be provided through the mechanism called Power Management Quality of Service (PM QoS).  I will show how it works for I/O devices in the Linux kernel and how the generic power management domains (PM domains) framework uses it to prevent I/O devices from going into deep low-power states when that is not desirable.
The target audience of the talk are kernel developers and people interested in runtime PM of I/O devices.  The participants should be familiar with the Linux driver model and the runtime PM core framework.


Rafael J. Wysocki

Intel OTC
I am the maintainer of the Linux kernel's core power management code (PM core), cpufreq and cpuidle.  I work at Intel Open Source Technology Center as a Software Engineer.  I have been actively contributing to the Linux kernel since 2005, working mostly on the suspend and hibernate... Read More →

Wednesday November 7, 2012 1:50pm - 2:35pm CET

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