Re: [Powertop] [PATCH] Fix timer and work perf events timestamp tracing

Arjan van de Ven <arjan at linux.intel.com> Wed, 05 Sep 2012 10:09:00 -0700
Newsgroups dev.linux.lists.powertop
Message-ID <[email protected]>
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On 9/5/2012 9:56 AM, Rajagopal Venkat wrote:
>> measure1:
>> ev3.start
>> ev1.end  <<<<<
> =

> evX.end  <<<<<
> These events are causing numbers to go wrong.

but out of a 20 second window.. this is a tiny tiny window...
if you see 100.1% I'd buy this reasoning.
but you're seeing much more than that.


>>
>> if so, then we're loosing events, which is no good. reporting less than =
100%
>> is ok, but reporting less than real is not.
> =

> I did thought of it. Yes, agree that, we are loosing events for which
> start timestamp

we can't lose those!
those are the events that give us the initial CPU frequency in the window e=
tc....


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