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SubjectRe: [patch] Performance Counters for Linux, v2
Ingo Molnar wrote:
> * Chris Friesen <cfriesen@nortel.com> wrote:

>> Regardless of sampling method, don't you still want some way to
>> enable/disable the various counters as close to simultaneously as
>> possible?
>
> If it's about counter control for the monitored task, then we sure could
> do something about that. (apps/libraries could thus select a subset of
> functions to profile/measure, runtime, etc.)
>
> If it's about counter control for the profiler/debugger, i'm not sure how
> useful that is - do you have a good usecase for it?

I'm sure that others could give more usecases, but I was thinking about
cases like "I want to test _these_ multiple metrics simultaneously over
_this_ specific section of code". In a case like this, it seems
desirable to start/stop the various performance counters as close
together as possible, especially if the section of code being tested is
short.

Chris


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