lkml.org 
[lkml]   [2012]   [Mar]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 3/3] perf, tool: Add new event group management
Em Wed, Mar 21, 2012 at 11:42:14AM +0100, Jiri Olsa escreveu:
> On Tue, Mar 20, 2012 at 07:44:41PM +0100, Peter Zijlstra wrote:
> > If so, we need some option like:
> >
> > perf record -e "{cpu-clock,cache-misses,cache-references}:1"
> >
> > to mean, only sample on cpu-clock but use PERF_SAMPLE_READ and
> > PERF_FORMAT_GROUP to read all siblings on every cpu-clock sample.
> >
> > Now the disadvantage is that {} needs quotes on bash, the advantage is
> > that its completely natural on how to construct groups, without weird
> > --group/--group parsed. Also it provides a place for group modifiers.
>
> how about '=group' keyword followed by ':' modifier
> perf record -e "cpu-clock,cache-misses,cache-references=group:1"
>
> or '=$groupname' and use the group name in output like
> perf stat -e "task-clock,context-switches=krava:1" ls
>
> Performance counter stats for 'ls':
>
> 1.003695 task-clock/krava # 0.083 CPUs utilized
> 0 context-switches/krava # 0.000 K/sec
>

Humm, interesting, perhaps putting the group name before the =event_list
will be more intuitive?

I.e.:

perf stat -e "krava=task-clock,context-switches:1" ls

- Arnaldo


\
 
 \ /
  Last update: 2012-03-21 16:15    [from the cache]
©2003-2011 Jasper Spaans