Re: [patch] Performance Counters for Linux, v2

["Chris Friesen" <cfriesen@nortel.com>]

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