linux-kernel - Re: [PATCH 00/18] perf metric: Add support to reuse metric

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Date:   Thu, 16 Jul 2020 08:50:56 +0100
From:   John Garry <john.garry@...wei.com>
To:     Jiri Olsa <jolsa@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>
CC:     lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Michael Petlan <mpetlan@...hat.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Kajol Jain <kjain@...ux.ibm.com>,
        "Paul A. Clarke" <pc@...ibm.com>,
        Stephane Eranian <eranian@...gle.com>,
        Ian Rogers <irogers@...gle.com>
Subject: Re: [PATCH 00/18] perf metric: Add support to reuse metric

On 12/07/2020 14:26, Jiri Olsa wrote:
> hi,
> this patchset is adding the support to reused metric in another
> metric. The metric needs to be referenced by 'metric:' prefix.
> 
> For example, to define IPC by using CPI with change like:
> 
>           "BriefDescription": "Instructions Per Cycle (per Logical Processor)",
>   -       "MetricExpr": "INST_RETIRED.ANY / CPU_CLK_UNHALTED.THREAD",
>   +       "MetricExpr": "1/metric:CPI",
>           "MetricGroup": "TopDownL1",
>           "MetricName": "IPC"
> 
> I won't be able to find all the possible places we could
> use this at, so I wonder you guys (who was asking for this)
> would try it and come up with comments if there's something
> missing or we could already use it at some places.
> 
> It's based on Arnaldo's tmp.perf/core.
> 
> v2 changes:
>    - collected Ian's acks for few patches [Ian]
>    - renamed expr__add_id to expr__add_id_val [Ian]
>    - renamed expr_parse_data to expr_id_data [Ian]
>    - added recursion check [Ian]
>    - added metric test for DCache_L2 metric [Ian]
>    - added some renames as discussed in review [Ian]
> 
> Also available in here:
>    git://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git
>    perf/metric
> 
> thanks,
> jirka
> 
> 
> ---
> Jiri Olsa (18):
>        perf metric: Rename expr__add_id to expr__add_val
>        perf metric: Add struct expr_id_data to keep expr value
>        perf metric: Add expr__add_id function
>        perf metric: Change expr__get_id to return struct expr_id_data
>        perf metric: Add expr__del_id function
>        perf metric: Add find_metric function
>        perf metric: Add add_metric function
>        perf metric: Rename __metricgroup__add_metric to __add_metric
>        perf metric: Collect referenced metrics in struct metric_ref_node
>        perf metric: Collect referenced metrics in struct metric_expr
>        perf metric: Add referenced metrics to hash data
>        perf metric: Compute referenced metrics
>        perf metric: Add events for the current group
>        perf metric: Add cache_miss_cycles to metric parse test
>        perf metric: Add DCache_L2 to metric parse test
>        perf metric: Add recursion check when processing nested metrics
>        perf metric: Rename struct egroup to metric
>        perf metric: Rename group_list to list

I was thinking that a test metric using this reuse feature could be 
added in pmu-events/arch/test/test_cpu. But since no relevant parsing is 
done in jevents, maybe not a lot of value. Just for a bit more completeness.

Thanks,
John

> 
>   tools/perf/tests/expr.c         |   7 +-
>   tools/perf/tests/parse-metric.c | 131 +++++++++++++++++++++++++++++++++++-
>   tools/perf/tests/pmu-events.c   |   4 +-
>   tools/perf/util/expr.c          | 130 ++++++++++++++++++++++++++++++------
>   tools/perf/util/expr.h          |  34 +++++++++-
>   tools/perf/util/expr.y          |  16 +++--
>   tools/perf/util/metricgroup.c   | 435 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++---------------------------
>   tools/perf/util/metricgroup.h   |   6 ++
>   tools/perf/util/stat-shadow.c   |  24 ++++---
>   9 files changed, 644 insertions(+), 143 deletions(-)
> 
> .
>