Re: [RFC v4 1/2] cpuidle: Extract IPI based and timer based wakeup latency from idle states

Hi Pratik,

On Mon, Apr 12, 2021 at 12:43 AM Pratik Rajesh Sampat psampat@linux.ibm.com wrote:

Introduce a mechanism to fire directed IPIs from a specified source CPU to a specified target CPU and measure the difference in time incurred on wakeup.

Also, introduce a mechanism to queue a HR timer on a specified CPU and subsequently measure the time taken to wakeup the CPU.

Finally define a simple debugfs interface to control the knobs to fire the IPI and Timer events on specified CPU and view their incurred idle wakeup latencies.

Signed-off-by: Pratik Rajesh Sampat psampat@linux.ibm.com

Reviewed-by: Doug Smythies dsmythies@telus.net