On Mon, Sep 21, 2020 at 6:46 PM Namhyung Kim <namhy...@kernel.org> wrote:
>
> The --for-each-cgroup option is a syntax sugar to monitor large number
> of cgroups easily. Current command line requires to list all the
> events and cgroups even if users want to monitor same events for each
> cgroup. This patch addresses that usage by copying given events for
> each cgroup on user's behalf.
>
> For instance, if they want to monitor 6 events for 200 cgroups each
> they should write 1200 event names (with -e) AND 1200 cgroup names
> (with -G) on the command line. But with this change, they can just
> specify 6 events and 200 cgroups with a new option.
>
> A simpler example below: It wants to measure 3 events for 2 cgroups
> ('A' and 'B'). The result is that total 6 events are counted like
> below.
>
> $ ./perf stat -a -e cpu-clock,cycles,instructions --for-each-cgroup A,B
> sleep 1
>
> Performance counter stats for 'system wide':
>
> 988.18 msec cpu-clock A # 0.987 CPUs utilized
> 3,153,761,702 cycles A # 3.200 GHz
> (100.00%)
> 8,067,769,847 instructions A # 2.57 insn per
> cycle (100.00%)
> 982.71 msec cpu-clock B # 0.982 CPUs utilized
> 3,136,093,298 cycles B # 3.182 GHz
> (99.99%)
> 8,109,619,327 instructions B # 2.58 insn per
> cycle (99.99%)
>
> 1.001228054 seconds time elapsed
>
> Signed-off-by: Namhyung Kim <namhy...@kernel.org>
> ---
> tools/perf/builtin-stat.c | 20 +++++++++-
> tools/perf/util/cgroup.c | 84 +++++++++++++++++++++++++++++++++++++++
> tools/perf/util/cgroup.h | 1 +
> tools/perf/util/stat.h | 1 +
> 4 files changed, 105 insertions(+), 1 deletion(-)
Oh, I've realized that I didn't update the man page..
I'll send v4 soon.
Thanks
Namhyung
