perf list: Support printing MetricExpr with --debug

Output the metric expr in perf list when --debug is specified, so that
the user can check the formula.

Before:

  % perf list
    ...
    unc_m_power_channel_ppd
         [Cycles where DRAM ranks are in power down (CKE) mode. Derived from unc_m_power_channel_ppd. Unit:
          uncore_imc]
          uncore_imc_2/event=0x85/

After:

  % perf list --debug
    ...
    unc_m_power_channel_ppd
         [Cycles where DRAM ranks are in power down (CKE) mode. Derived from unc_m_power_channel_ppd. Unit:
          uncore_imc]
          Perf: uncore_imc_2/event=0x85/ MetricExpr: (unc_m_power_channel_ppd / unc_m_clockticks) * 100.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Link: http://lkml.kernel.org/r/20170320201711.14142-12-andi@firstfloor.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 8 insertions, 2 deletions

diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index 0f1133aa3253..f819ad162b7c 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -1105,6 +1105,7 @@ struct sevent {
         char *topic;
         char *str;
         char *pmu;
+        char *metric_expr;
 };
 
 static int cmp_sevent(const void *a, const void *b)
@@ -1203,6 +1204,7 @@ void print_pmu_events(const char *event_glob, bool name_only, bool quiet_flag,
                         aliases[j].topic = alias->topic;
                         aliases[j].str = alias->str;
                         aliases[j].pmu = pmu->name;
+                        aliases[j].metric_expr = alias->metric_expr;
                         j++;
                 }
                 if (pmu->selectable &&
@@ -1237,8 +1239,12 @@ void print_pmu_events(const char *event_glob, bool name_only, bool quiet_flag,
                         printf("%*s", 8, "[");
                         wordwrap(aliases[j].desc, 8, columns, 0);
                         printf("]\n");
-                        if (verbose > 0)
-                                printf("%*s%s/%s/\n", 8, "", aliases[j].pmu, aliases[j].str);
+                        if (verbose > 0) {
+                                printf("%*s%s/%s/ ", 8, "", aliases[j].pmu, aliases[j].str);
+                                if (aliases[j].metric_expr)
+                                        printf(" MetricExpr: %s", aliases[j].metric_expr);
+                                putchar('\n');
+                        }
                 } else
                         printf("  %-50s [Kernel PMU event]\n", aliases[j].name);
                 printed++;