Em Wed, Jul 08, 2015 at 12:52:40AM +0200, Peter Zijlstra escreveu: > On Tue, Jul 07, 2015 at 01:13:59PM -0300, Arnaldo Carvalho de Melo wrote: > > Em Tue, Jul 07, 2015 at 05:36:14PM +0200, Peter Zijlstra escreveu: > > > > To help userspace in places where all it has is the union perf_event, we > > > > can reuse one bit in misc to state that, i.e.
> > > > #define PERF_RECORD_MISC_SWITCH_NEXT_PREV_PID 14 > > > > For instance. > > > The other option would be a separate RECORD type, which might be > > > simpler. > > Humm, do we really need it? > > I think this is just us wanting to, since we are going to add a new > > record, to make it more useful for other, not right now needed, > > situations, i.e. if the user is priviledged, there are two other options > > to get his info, right? > I was just thinking that 2 records, each with a fixed layout would be > easier to parse than 1 record with variable layout. > The record space is immense, so from that point it really doesn't > matter. We could do a land grab at some point there, if/when we find some reason for that... :-) > Do whatever is easiest, less mistakes get made etc. :-) > No real preference either way, as long we we've thought about it. Right, I just don't want to have two u32 carrying -1 for no reason. - Arnaldo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
