On Tue, Jul 12, 2016 at 2:59 PM, Sudeep Holla <sudeep.holla@xxxxxxx> wrote: > > > On 12/07/16 13:09, Rafael J. Wysocki wrote: >> >> On Tuesday, July 12, 2016 12:42:06 PM Sudeep Holla wrote: >>> >>> >>> On 08/07/16 18:07, Sudeep Holla wrote: >>>> >>>> ACPI 6.0 introduced LPI(Low Power Idle) states that provides an >>>> alternate >>>> method to describe processor idle states. It extends the specification >>>> to allow the expression of idle states like C-states selectable by the >>>> OSPM when a processor goes idle, but may affect more than one processor, >>>> and may affect other system components. >>>> >>>> LPI extensions leverages the processor container device(again introduced >>>> in ACPI 6.0) allowing to express which parts of the system are affected >>>> by a given LPI state. It defines the local power states for each node >>>> in a hierarchical processor topology. The OSPM can use _LPI object to >>>> select a local power state for each level of processor hierarchy in the >>>> system. They used to produce a composite power state request that is >>>> presented to the platform by the OSPM. >>>> >>>> Since multiple processors affect the idle state for any non-leaf >>>> hierarchy >>>> node, coordination of idle state requests between the processors is >>>> required. ACPI supports two different coordination schemes: Platform >>>> coordinated and OS initiated. >>>> >>> >>> I was hoping to get this in v4.8 now that merge window is >>> delayed/extended if you have no further comments on this series. >> >> >> I'll get to it in the next couple of days. If it looks all good and there >> are >> no comments, I'll queue it up. >> > > Thanks for the update. I've just looked at patch [2/7] and there still are things I'm not particularly liking in it. Apart from a bunch of minor stuff, acpi_processor_get_lpi_info() is not my favorite. The way it creates all of those temporary data structures and then walks them recursively seems a bit excessive. I need to think about it a bit more, so I'll send my comments on that patch later this week. Thanks, Rafael -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
