[RFC 00/10] perf tools: Add support to reuse metric

[Jiri Olsa <jolsa@kernel.org>]

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.

Also available in here:
  git://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git
  perf/metric

thanks,
jirka


---
Jiri Olsa (10):
      perf tools: Rename expr__add_id to expr__add_val
      perf tools: Add struct expr_parse_data to keep expr value
      perf tools: Add expr__add_id function
      perf tools: Change expr__get_id to return struct expr_parse_data
      perf tools: Add expr__del_id function
      perf tools: Collect other metrics in struct egroup
      perf tools: Collect other metrics in struct metric_expr
      perf tools: Add other metrics to hash data
      perf tools: Compute other metrics
      perf tests: Add cache_miss_cycles to metric parse test

 tools/perf/pmu-events/arch/x86/skylake/skl-metrics.json |   2 +-
 tools/perf/tests/expr.c                                 |   7 ++--
 tools/perf/tests/parse-metric.c                         |  33 +++++++++++++++++
 tools/perf/tests/pmu-events.c                           |   4 +--
 tools/perf/util/expr.c                                  | 115 +++++++++++++++++++++++++++++++++++++++++++++-------------
 tools/perf/util/expr.h                                  |  24 +++++++++++--
 tools/perf/util/expr.y                                  |  34 ++++++++++++++----
 tools/perf/util/metricgroup.c                           | 187 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++--------
 tools/perf/util/metricgroup.h                           |   6 ++++
 tools/perf/util/stat-shadow.c                           |  23 +++++++-----
 10 files changed, 374 insertions(+), 61 deletions(-)