perf list: Add debug support for outputing alias string

For debugging and testing it is useful to see the converted alias
string. Add support to perf stat/record and perf list to print the alias
conversion. The text string is saved in the alias structure.  For perf
stat/record it is folded into the normal -v. For perf list -v was taken,
so we use --debug.

Before:

% perf list
...
cache:
  l1d.replacement
       [L1D data line replacements]
  l1d_pend_miss.fb_full
       [Cycles a demand request was blocked due to Fill Buffers inavailability]

After

% perf list --debug
...
cache:
  l1d.replacement
       [L1D data line replacements]
        cpu/umask=0x1,period=2000003,event=0x51/
  l1d_pend_miss.fb_full
       [Cycles a demand request was blocked due to Fill Buffers inavailability]
        cpu/umask=0x2,period=2000003,cmask=1,event=0x48/

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Link: http://lkml.kernel.org/r/20170128020345.19007-6-andi@firstfloor.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

3 files changed, 12 insertions, 0 deletions

diff --git a/tools/perf/util/parse-events.y b/tools/perf/util/parse-events.y
index f3b5ec901600..3a5196380609 100644
--- a/tools/perf/util/parse-events.y
+++ b/tools/perf/util/parse-events.y
@@ -13,6 +13,7 @@
 #include <linux/types.h>
 #include "util.h"
 #include "pmu.h"
+#include "debug.h"
 #include "parse-events.h"
 #include "parse-events-bison.h"
 
@@ -254,6 +255,8 @@ PE_KERNEL_PMU_EVENT sep_dc
 
 				if (!parse_events_add_pmu(data, list,
 						  pmu->name, head)) {
+					pr_debug("%s -> %s/%s/\n", $1,
+						 pmu->name, alias->str);
 					ok++;
 				}
 
diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index 8e9d00fd418e..82a654dec666 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -275,6 +275,8 @@ static int __perf_pmu__new_alias(struct list_head *list, char *dir, char *name,
 		snprintf(alias->unit, sizeof(alias->unit), "%s", unit);
 	}
 	alias->per_pkg = perpkg && sscanf(perpkg, "%d", &num) == 1 && num == 1;
+	alias->str = strdup(val);
+
 	list_add_tail(&alias->list, list);
 
 	return 0;
@@ -1087,6 +1089,8 @@ struct sevent {
 	char *name;
 	char *desc;
 	char *topic;
+	char *str;
+	char *pmu;
 };
 
 static int cmp_sevent(const void *a, const void *b)
@@ -1183,6 +1187,8 @@ void print_pmu_events(const char *event_glob, bool name_only, bool quiet_flag,
 			aliases[j].desc = long_desc ? alias->long_desc :
 						alias->desc;
 			aliases[j].topic = alias->topic;
+			aliases[j].str = alias->str;
+			aliases[j].pmu = pmu->name;
 			j++;
 		}
 		if (pmu->selectable &&
@@ -1217,6 +1223,8 @@ 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)
+				printf("%*s%s/%s/\n", 8, "", aliases[j].pmu, aliases[j].str);
 		} else
 			printf("  %-50s [Kernel PMU event]\n", aliases[j].name);
 		printed++;
diff --git a/tools/perf/util/pmu.h b/tools/perf/util/pmu.h
index 25712034c815..00852ddc7741 100644
--- a/tools/perf/util/pmu.h
+++ b/tools/perf/util/pmu.h
@@ -43,6 +43,7 @@ struct perf_pmu_alias {
 	char *desc;
 	char *long_desc;
 	char *topic;
+	char *str;
 	struct list_head terms; /* HEAD struct parse_events_term -> list */
 	struct list_head list;  /* ELEM */
 	char unit[UNIT_MAX_LEN+1];