8:52 p.m.
Hi powertop team,
I have few questions about powertop as below:-
1) Does powertop use "<debugfs>/cpuidle/stats" for retriving the C state
information.
2) Is it possible that on "cat <debugfs>/cpuidle/stats" , we see the C3
state is having '0' count. but at same time powertop show the C3 state
being hit?
Regards,
remu
11:09 p.m.
New subject: [Powertop] regarding cpuidle stats
On 7/29/2013 3:52 AM, remu kelly wrote:
Hi powertop team,
I have few questions about powertop as below:-
1) Does powertop use "<debugfs>/cpuidle/stats" for retriving the C state
information.
no
it uses various kernel trace points to collect things as they happen
2) Is it possible that on "cat
<debugfs>/cpuidle/stats" , we see the C3 state is having '0' count. but
at same time powertop show the C3 state being hit?
I am not sure how well cpuidle stats work; never used them.
11:34 p.m.
New subject: [Powertop] regarding cpuidle stats
On 7/29/2013 6:09 AM, Arjan van de Ven wrote:
On 7/29/2013 3:52 AM, remu kelly wrote:
> Hi powertop team,
> I have few questions about powertop as below:-
> 1) Does powertop use "<debugfs>/cpuidle/stats" for retriving the C
state information.
no
it uses various kernel trace points to collect things as they happen
I should
mention that we also use hardware counters on systems that have them;
much more accurate than any OS counter ;)
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remu kelly