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>

diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index 0f1133a..f819ad1 100644 (file)
--- 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++;