linux-kernel - Re: [PATCH v2 2/2] perf stat: Support regex pattern in --for-each-cgroup

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Date:   Mon, 26 Oct 2020 12:40:09 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Stephane Eranian <eranian@...gle.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Ian Rogers <irogers@...gle.com>
Subject: Re: [PATCH v2 2/2] perf stat: Support regex pattern in
 --for-each-cgroup

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?


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

jirka