Re: [PATCH 2/3] PERF(kernel): Cleanup power events

Arjan van de Ven <arjan@xxxxxxxxxxxxxxx> · Sun, 24 Oct 2010 23:58:00 -0700

On 10/19/2010 4:36 AM, Thomas Renninger wrote:

New power trace events:
power:processor_idle
power:processor_frequency
power:machine_suspend

C-state/idle accounting events:
   power:power_start
   power:power_end
are replaced with:
   power:processor_idle

I think you need two trace points for this
one to enter idle
one to exit

because using magic encoding games to encode "exit"is a mistake; as can 

be seen in this patch.

You're currently trying to use "0" to signal "end of idle", but "0" is 

also a valid idle state (namely that of polling)

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