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SubjectRe: [PATCH v2 2/2] perf stat: Support regex pattern in --for-each-cgroup
Hi Jiri,

On Mon, Oct 26, 2020 at 8:40 PM Jiri Olsa <jolsa@redhat.com> wrote:
>
> On Sat, Oct 24, 2020 at 11:59:18AM +0900, Namhyung Kim wrote:
> > To make the command line even more compact with cgroups, support regex
> > pattern matching in cgroup names.
> >
> > $ perf stat -a -e cpu-clock,cycles --for-each-cgroup ^foo sleep 1
> >
> > 3,000.73 msec cpu-clock foo # 2.998 CPUs utilized
> > 12,530,992,699 cycles foo # 7.517 GHz (100.00%)
> > 1,000.61 msec cpu-clock foo/bar # 1.000 CPUs utilized
> > 4,178,529,579 cycles foo/bar # 2.506 GHz (100.00%)
> > 1,000.03 msec cpu-clock foo/baz # 0.999 CPUs utilized
> > 4,176,104,315 cycles foo/baz # 2.505 GHz (100.00%)
>
> just curious.. there was another foo/XXX group using the
> rest of the cycles, right?

No, if so it should be displayed too. But actually there was a process
in the foo cgroup itself.

>
> also perhaps we want to warn if there's no match found:
>
> $ sudo ./perf stat -a -e cpu-clock,cycles --for-each-cgroup ^foo sleep 1
>
> Performance counter stats for 'system wide':
>
>
> 1.002375575 seconds time elapsed
>

Right, will check this case.

Thanks
Namhyung

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