linux-kernel - Re: [PATCH v1 0/2] perf stat: Support --all-kernel and --all-user

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Date:   Mon, 30 Sep 2019 16:28:00 -0300
From:   Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:     Andi Kleen <ak@...ux.intel.com>
Cc:     Jiri Olsa <jolsa@...hat.com>, Jin Yao <yao.jin@...ux.intel.com>,
        jolsa@...nel.org, peterz@...radead.org, mingo@...hat.com,
        alexander.shishkin@...ux.intel.com, Linux-kernel@...r.kernel.org,
        kan.liang@...el.com, yao.jin@...el.com
Subject: Re: [PATCH v1 0/2] perf stat: Support --all-kernel and --all-user

Em Mon, Sep 30, 2019 at 11:21:36AM -0700, Andi Kleen escreveu:
> On Sun, Sep 29, 2019 at 05:29:13PM +0200, Jiri Olsa wrote:
> > On Wed, Sep 25, 2019 at 10:02:16AM +0800, Jin Yao wrote:
> > > This patch series supports the new options "--all-kernel" and "--all-user"
> > > in perf-stat.

> > > For example,

> > > root@kbl:~# perf stat -e cycles,instructions --all-kernel --all-user -a -- sleep 1

> > >  Performance counter stats for 'system wide':

> > >         19,156,665      cycles:k
> > >          7,265,342      instructions:k            #    0.38  insn per cycle
> > >      4,511,186,293      cycles:u
> > >        121,881,436      instructions:u            #    0.03  insn per cycle

> > I think we should follow --all-kernel/--all-user behaviour from record
> > command, adding extra events seems like unnecesary complexity to me
 
> I think it's useful. Makes it easy to do kernel/user break downs.
> perf record should support the same.

Don't we have this already with:

[root@...co ~]# perf stat -e cycles:u,instructions:u,cycles:k,instructions:k -a -- sleep 1

 Performance counter stats for 'system wide':

        69,937,445      cycles:u
        23,459,595      instructions:u            #    0.34  insn per cycle
        51,040,704      cycles:k
        11,368,152      instructions:k            #    0.22  insn per cycle

       1.002887417 seconds time elapsed

[root@...co ~]# perf record -e cycles:u,instructions:u,cycles:k,instructions:k -a -- sleep 1
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 1.340 MB perf.data (927 samples) ]
[root@...co ~]# perf evlist
cycles:u
instructions:u
cycles:k
instructions:k
[root@...co ~]#

To make it shorter we could have:

diff --git a/tools/perf/util/parse-events.l b/tools/perf/util/parse-events.l
index 7469497cd28e..7df28b0e9682 100644
--- a/tools/perf/util/parse-events.l
+++ b/tools/perf/util/parse-events.l
@@ -313,11 +313,11 @@ aux-output		{ return term(yyscanner, PARSE_EVENTS__TERM_TYPE_AUX_OUTPUT); }
 <<EOF>>			{ BEGIN(INITIAL); }
 }
 
-cpu-cycles|cycles				{ return sym(yyscanner, PERF_TYPE_HARDWARE, PERF_COUNT_HW_CPU_CYCLES); }
+cpu-cycles|cycles|cyc				{ return sym(yyscanner, PERF_TYPE_HARDWARE, PERF_COUNT_HW_CPU_CYCLES); }
 stalled-cycles-frontend|idle-cycles-frontend	{ return sym(yyscanner, PERF_TYPE_HARDWARE, PERF_COUNT_HW_STALLED_CYCLES_FRONTEND); }
 stalled-cycles-backend|idle-cycles-backend	{ return sym(yyscanner, PERF_TYPE_HARDWARE, PERF_COUNT_HW_STALLED_CYCLES_BACKEND); }
-instructions					{ return sym(yyscanner, PERF_TYPE_HARDWARE, PERF_COUNT_HW_INSTRUCTIONS); }
+instructions|insn|ins				{ return sym(yyscanner, PERF_TYPE_HARDWARE, PERF_COUNT_HW_INSTRUCTIONS); }
 cache-misses					{ return sym(yyscanner, PERF_TYPE_HARDWARE, PERF_COUNT_HW_CACHE_MISSES); }
 branch-instructions|branches			{ return sym(yyscanner, PERF_TYPE_HARDWARE, PERF_COUNT_HW_BRANCH_INSTRUCTIONS); }
 branch-misses					{ return sym(yyscanner, PERF_TYPE_HARDWARE, PERF_COUNT_HW_BRANCH_MISSES); }

And another thing that comes to mind is to make -M metrics be accepted
as -e arg, as someone suggested recently (Andi?), and also make it set
its events honouring the :k or :u modifiers:

[root@...co ~]# perf stat -M ipc
^C
 Performance counter stats for 'system wide':

        15,030,011      inst_retired.any          #      0.3 IPC
        54,449,797      cpu_clk_unhalted.thread

       1.186531715 seconds time elapsed


[root@...co ~]# perf stat -M ipc:k,ipc:u
Cannot find metric or group `ipc:k'

 Usage: perf stat [<options>] [<command>]

    -M, --metrics <metric/metric group list>
                          monitor specified metrics or metric groups (separated by ,)
[root@...co ~]#


- Arnaldo