Messages in this thread | | | Date | Wed, 21 Mar 2012 12:11:19 -0300 | From | Arnaldo Carvalho de Melo <> | Subject | Re: [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
| |