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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.

Speakers

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 subsystem as well as on power management in general, including runtime PM, PM QoS, ACPI.

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

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