[PATCH] ARM: perf: add PMU hotplug notifier

[Ashwin Chaugule]

On 2/23/2012 11:04 AM, Will Deacon wrote:
> 
> Ok. Note that the perf core will actually destroy perf events on a hotplug
> down notification, so profiling runs will be dead on that core even if it
> comes back up.
> 
> This patch just ensures that we have a sane state in the control registers
> given that their state is UNKNOWN out of reset. Adding full hotplug support
> to perf (that is, supporting hotplug events during a run and representing
> that in a meaningful way) is a larger issue.
> 
>>> I'll send a link to my code once the git server is up. It's a bit flaky today.
> 
> Ok, cool. Are you happy with me to proceed with the current code for the
> time being?
> 

Sure. We'll need to be able to distinguish between a hotplug and a CPU
power-collapse / deep sleep / what-have-you state in this code at some
point since they all have a different effect on the PMU regs.

Cheers,
Ashwin

-- 
Sent by an employee of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.