[RFC PATCH v2 0/1] ARM: cpuidle: heterogeneous systems extension

Lina Iyer lina.iyer at linaro.org
Tue May 12 09:36:50 PDT 2015

On Wed, Apr 22 2015 at 02:55 -0600, Lorenzo Pieralisi wrote:
>On Tue, Apr 21, 2015 at 07:24:54PM +0100, Kevin Hilman wrote:
>> On Thu, Apr 16, 2015 at 9:10 AM, Lorenzo Pieralisi
>> <lorenzo.pieralisi at arm.com> wrote:
>> [...]
>> > This patch sets the maximum number of static CPUidle drivers allowed to
>> > two, since it is hard to foresee systems with more than two sets of CPUs
>> > having different idle states
>> It's not hard to forsee anymore:
>>    http://www.cnx-software.com/2015/04/21/mediatek-helio-x20-deca-core-processor/
>>    https://liliputing.com/2015/04/closer-look-at-mediateks-upcoming-10-core-helio-x20-processor.html
>Eheh I stand corrected :). Not a big deal, drivers can be allocated
>dynamically; it seems that the designs above leave us no choice, the
>idle states are the only differentiating factor when it comes
>to CPUidle driver logical cpumask creation, happy to hear more
>opinions on this, but I do not really see what we can use instead.

Dynamic idle driver would be nice. Otherwise, the patch looks good to


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