> Saravana Kannan <skannan@codeaurora.org> writes:
>
>> Some drivers/devices might need some minimum system bus performance to
>> provide acceptable service. Provide a PM QoS parameter to send these requests
>> to.
>>
>> The new parameter is named "system bus performance" since it is generic enough
>> for the unit of the request to be frequency, bandwidth or something else that
>> might be appropriate. It's up to each implementation of the QoS provider to
>> define what the unit of the request would be.
>>
>> Signed-off-by: Saravana Kannan <skannan@codeaurora.org>
>
> With this current design, only one system-wide bus would be managed.
> What if a platform has more than one independently scalable bus?
>
> I think the only scalable way to handle this kind of thing is to have
> per-device QoS constraints that can then be combined/aggregated by parent
> devices/busses.
>
> At LPC this year, I've proposed per-device QoS constraints[1] as a topic
> for the PM mini-conf. I hope some folks from the MSM camp can be there
> for these discussions.
>
> Kevin
>
> [1]
http://www.linuxplumbersconf.org/2010/ocw/proposals/819
