On Mon, Jan 18, 2010 at 03:37:01PM +0100, Peter Zijlstra wrote: > On Mon, 2010-01-18 at 15:20 +0100, Frederic Weisbecker wrote: > > > > > Then there's still the question of having events of multiple hw pmus in > > > a single group, I'd be perfectly fine with saying that's not allowed, > > > what to others think? > > > > > > I guess we need that. It can be insteresting to couple > > hardware counters with memory accesses...or whatever. > > That really depends on how easy it is to correlate events from the > various pmus. This case could indeed do that, but the core vs uncore > tihng is a lot less clear.
Not sure what you both mean by this core VS uncore thing :) Is it about hardware counters that apply to single hardware threads or shared among them inside a same core? > > Perf stat combines cache miss counting with page faults, > > cpu clock counters. > > perf stat also doesn't use groups and it still works quite nicely. Ah? I thought it does. > > We shouldn't limit such possibilities for technical/cleanliness > > reasons. We should rather adapt. > > Maybe, I'm not a very big fan of groups myself, but they are clearly > useful within a pmu, measuring cache misses through total-access for > example, but the use between pmus is questionable. Cross pmu, these seem to only make sense for non pinned groups. If you want two non-pinned counters to be paired and not randomly and separately scheduled. For other cases, indeed I'm not sure it is useful :) ------------------------------------------------------------------------------ Throughout its 18-year history, RSA Conference consistently attracts the world's best and brightest in the field, creating opportunities for Conference attendees to learn about information security's most important issues through interactions with peers, luminaries and emerging and established companies. http://p.sf.net/sfu/rsaconf-dev2dev _______________________________________________ perfmon2-devel mailing list perfmon2-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/perfmon2-devel
