Messages in this thread | | | Date | Tue, 9 Dec 2008 20:02:54 +0100 | From | Ingo Molnar <> | Subject | Re: [patch] Performance Counters for Linux, v2 |
| |
* Chris Friesen <cfriesen@nortel.com> wrote:
> Ingo Molnar wrote: > >> When there are two (or more) hw metrics to profile, the ideally best >> (i.e. the statistically most stable and most relevant) sampling for >> the two statistical variables (say of l2_misses versus l2_accesses) is >> to sample them independently, via their own metric. Not via a static >> 1khz rate - or via picking one of the variables to generate samples. > > 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?
Ingo
| |