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From:   Ian Rogers <irogers@google.com>
Date:   Tue, 29 Nov 2022 21:01:11 -0800
Message-ID: <CAP-5=fXu-LD9fFzB4+A=xxq0St2MipfJO3XkGLovrZLqQumbFA@mail.gmail.com>
Subject: Re: [PATCH 14/15] perf stat: Rename "aggregate-number" to "cpu-count"
 in JSON
To:     Namhyung Kim <namhyung@kernel.org>
Cc:     Arnaldo Carvalho de Melo <acme@kernel.org>,
        Jiri Olsa <jolsa@kernel.org>, Ingo Molnar <mingo@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        LKML <linux-kernel@vger.kernel.org>,
        Adrian Hunter <adrian.hunter@intel.com>,
        linux-perf-users@vger.kernel.org,
        Kan Liang <kan.liang@linux.intel.com>,
        Zhengjun Xing <zhengjun.xing@linux.intel.com>,
        James Clark <james.clark@arm.com>,
        Athira Jajeev <atrajeev@linux.vnet.ibm.com>
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Precedence: bulk

On Tue, Nov 29, 2022 at 2:46 PM Namhyung Kim <namhyung@kernel.org> wrote:
>
> On Sat, Nov 26, 2022 at 7:14 PM Ian Rogers <irogers@google.com> wrote:
> >
> > On Thu, Nov 24, 2022 at 11:51 PM Namhyung Kim <namhyung@kernel.org> wrote:
> > >
> > > Hi Ian,
> > >
> > > On Wed, Nov 23, 2022 at 3:31 PM Ian Rogers <irogers@google.com> wrote:
> > > >
> > > > On Wed, Nov 23, 2022 at 10:02 AM Namhyung Kim <namhyung@kernel.org> wrote:
> > > > >
> > > > > As the JSON output has been broken for a little while, I guess there are
> > > > > not many users.  Let's rename the field to more intuitive one. :)
> > > >
> > > > I'm not sure cpu-count is accurate. For example, an uncore counter in
> > > > a dual socket machine may have a CPU mask of "0, 36", ie one event per
> > > > socket. The aggregate-number in this case I believe is 2.
> > >
> > > You're right.  In case of uncore events, it can be confusing.  But in some
> > > sense it could be thought as cpu count as well since it aggregates the
> > > result from two cpus anyway. :)
> > >
> > > Note that the aggregate-number (or cpu-count) is only printed if users
> > > requested one of aggregation options like --per-socket or --per-core.
> > > In your example, then it could print 1 for each socket.
> > >
> > > But I think uncore events are different from core events, and hopefully
> > > they have separate instances for different sockets or something already.
> > > That means it doesn't need to use those aggregation options for them.
> > >
> > > Also the CSV output uses "cpus" for the same information.  It'd be nice
> > > we could have consistency.
> >
> > So in the original patch from Claire she'd passed the name "number"
> > through to the json from the stat code. Having an integer called
> > "number" isn't exactly intention revealing - thank you for your clean
> > up work! :-) I switched "number" to be "aggregate number" as the
> > number comes from the "data" aggregated and the code refers to it as
> > aggregate data. I think aggregate-number is more consistent with the
> > code, and cpu-count would look strange in the uncore case above where
> > the number of CPUs (really hyperthreads) is 72. Perhaps we should also
> > be outputting the aggregation mode with the number. Anyway, I think
> > for the patch series I'd prefer we skipped this one and kept the rest.
>
> Right, I think we need a more general term to include non-cpu events.
> But it seems Arnaldo already merged it.
>
> Arnaldo, do you want me to send a revert?
>
> Thanks,
> Namhyung

This is also breaking the json output test:

$ perf test -vv 89
89: perf stat JSON output linter                                    :
--- start ---
test child forked, pid 2116261
Checking json output: no args [Success]
Checking json output: system wide [Success]
Checking json output: interval [Success]
Checking json output: event [Success]
Checking json output: per thread [Success]
Checking json output: per node Test failed for input:
{"node" : "N0", "cpu-count" : 16, "counter-value" : "32.468431",
"unit" : "msec", "event" : "cpu-clo
ck", "event-runtime" : 32498339, "pcnt-running" : 100.00,
"metric-value" : 19.450525, "metric-unit"
: "CPUs utilized"}

{"node" : "N0", "cpu-count" : 16, "counter-value" : "52.000000",
"unit" : "", "event" : "context-swi
tches", "event-runtime" : 32471361, "pcnt-running" : 100.00,
"metric-value" : 1.601556, "metric-unit
" : "K/sec"}

{"node" : "N0", "cpu-count" : 16, "counter-value" : "16.000000",
"unit" : "", "event" : "cpu-migrati
ons", "event-runtime" : 32469950, "pcnt-running" : 100.00,
"metric-value" : 492.786362, "metric-unit
" : "/sec"}

{"node" : "N0", "cpu-count" : 16, "counter-value" : "57.000000",
"unit" : "", "event" : "page-faults
", "event-runtime" : 32474408, "pcnt-running" : 100.00, "metric-value"
: 1.755551, "metric-unit" : "
K/sec"}

{"node" : "N0", "cpu-count" : 16, "counter-value" : "2958499.000000",
"unit" : "", "event" : "cycles
", "event-runtime" : 32411643, "pcnt-running" : 100.00, "metric-value"
: 0.091119, "metric-unit" : "
GHz"}

{"node" : "N0", "cpu-count" : 16, "counter-value" : "3175893.000000",
"unit" : "", "event" : "instru
ctions", "event-runtime" : 32403573, "pcnt-running" : 100.00,
"metric-value" : 1.073481, "metric-uni
t" : "insn per cycle"}

{"node" : "N0", "cpu-count" : 16, "counter-value" : "688120.000000",
"unit" : "", "event" : "branche
s", "event-runtime" : 32391536, "pcnt-running" : 100.00,
"metric-value" : 21.193509, "metric-unit" :
"M/sec"}

{"node" : "N0", "cpu-count" : 16, "counter-value" : "17584.000000",
"unit" : "", "event" : "branch-m
isses", "event-runtime" : 32371972, "pcnt-running" : 100.00,
"metric-value" : 2.555368, "metric-unit
" : "of all branches"}

{"node" : "N0", "cpu-count" : 16, "counter-value" : "14377890.000000",
"unit" : "", "event" : "slots
", "event-runtime" : 32350026, "pcnt-running" : 100.00, "metric-value"
: 442.826757, "metric-unit" :
"M/sec"}

{"node" : "N0", "cpu-count" : 16, "counter-value" : "3380921.000000",
"unit" : "", "event" : "topdow
n-retiring", "event-runtime" : 32350026, "pcnt-running" : 100.00,
"metric-value" : 23.514767, "metri
c-unit" : "Retiring"}

{"node" : "N0", "cpu-count" : 16, "counter-value" : "1444174.000000",
"unit" : "", "event" : "topdow
n-bad-spec", "event-runtime" : 32350026, "pcnt-running" : 100.00,
"metric-value" : 10.044427, "metri
c-unit" : "Bad Speculation"}

{"node" : "N0", "cpu-count" : 16, "counter-value" : "5899393.000000",
"unit" : "", "event" : "topdow
n-fe-bound", "event-runtime" : 32350026, "pcnt-running" : 100.00,
"metric-value" : 41.031084, "metri
c-unit" : "Frontend Bound"}

{"node" : "N0", "cpu-count" : 16, "counter-value" : "3653375.000000",
"unit" : "", "event" : "topdow
n-be-bound", "event-runtime" : 32350026, "pcnt-running" : 100.00,
"metric-value" : 25.409722, "metri
c-unit" : "Backend Bound"}

Traceback (most recent call last):
 File "/home/irogers/kernel.org/./tools/perf/tests/shell/lib/perf_json_output_lint.py",
line 93, in
<module>
   check_json_output(expected_items)
 File "/home/irogers/kernel.org/./tools/perf/tests/shell/lib/perf_json_output_lint.py",
line 78, in
check_json_output
   raise RuntimeError(f'Unexpected key: key={key} value={value}')
RuntimeError: Unexpected key: key=cpu-count value=16
test child finished with -1
---- end ----
perf stat JSON output linter: FAILED!

Thanks,
Ian