On Tue, 02 Mar 2010, Peter Zijlstra wrote:

> On Tue, 2010-03-02 at 14:42 +0000, Eric B Munson wrote:
> > Currently perf record does not write the ID or the STREAM_ID to disk
> > for events.  This doesn't allow report to tell if an event stream contains
> > one or more types of events.  This patch adds these two entries to the list
> > of data that record will write to disk.
> > 
> > Signed-off-by: Eric B Munson <ebmunson@us.ibm.com>
> > ---
> >  tools/perf/builtin-record.c |    3 ++-
> >  1 files changed, 2 insertions(+), 1 deletions(-)
> > 
> > diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
> > index 771533c..35e4605 100644
> > --- a/tools/perf/builtin-record.c
> > +++ b/tools/perf/builtin-record.c
> > @@ -242,7 +242,8 @@ static void create_counter(int counter, int cpu, pid_t pid)
> >  				  PERF_FORMAT_TOTAL_TIME_RUNNING |
> >  				  PERF_FORMAT_ID;
> >  
> > -	attr->sample_type	|= PERF_SAMPLE_IP | PERF_SAMPLE_TID;
> > +	attr->sample_type	|= PERF_SAMPLE_IP | PERF_SAMPLE_TID |
> > +				   PERF_SAMPLE_ID | PERF_SAMPLE_STREAM_ID;
> >  
> >  	if (freq) {
> >  		attr->sample_type	|= PERF_SAMPLE_PERIOD;
> 
> can we make this conditional on there being more than one event, that
> saves a little space/time when recording
> 

Yeah, I will add that in the next version.

-- 
Eric B Munson
IBM Linux Technology Center
ebmunson@us.ibm.com