perf list jevents: Add support for event list topics

Add support to group the output of perf list by the Topic field in the
JSON file.

Example output:

% perf list
...
Cache:
  l1d.replacement
       [L1D data line replacements]
  l1d_pend_miss.pending
       [L1D miss oustandings duration in cycles]
  l1d_pend_miss.pending_cycles
       [Cycles with L1D load Misses outstanding]
  l2_l1d_wb_rqsts.all
       [Not rejected writebacks from L1D to L2 cache lines in any state]
  l2_l1d_wb_rqsts.hit_e
       [Not rejected writebacks from L1D to L2 cache lines in E state]
  l2_l1d_wb_rqsts.hit_m
       [Not rejected writebacks from L1D to L2 cache lines in M state]

...
Pipeline:
  arith.fpu_div
       [Divide operations executed]
  arith.fpu_div_active
       [Cycles when divider is busy executing divide operations]
  baclears.any
       [Counts the total number when the front end is resteered, mainly
       when the BPU cannot provide a correct prediction and this is
       corrected by other branch handling mechanisms at the front end]
  br_inst_exec.all_branches
       [Speculative and retired branches]
  br_inst_exec.all_conditional
       [Speculative and retired macro-conditional branches]
  br_inst_exec.all_direct_jmp
       [Speculative and retired macro-unconditional branches excluding
       calls and indirects]
  br_inst_exec.all_direct_near_call
       [Speculative and retired direct near calls]
  br_inst_exec.all_indirect_jump_non_call_ret

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Acked-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: linuxppc-dev@lists.ozlabs.org
Link: http://lkml.kernel.org/r/1473978296-20712-14-git-send-email-sukadev@linux.vnet.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

2 files changed, 28 insertions, 10 deletions

diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index 8ff382cb161d..b1474dcadfa2 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -223,7 +223,8 @@ static int perf_pmu__parse_snapshot(struct perf_pmu_alias *alias,
 }
 
 static int __perf_pmu__new_alias(struct list_head *list, char *dir, char *name,
-                                 char *desc, char *val, char *long_desc)
+                                 char *desc, char *val, char *long_desc,
+                                 char *topic)
 {
         struct perf_pmu_alias *alias;
         int ret;
@@ -259,6 +260,7 @@ static int __perf_pmu__new_alias(struct list_head *list, char *dir, char *name,
         alias->desc = desc ? strdup(desc) : NULL;
         alias->long_desc = long_desc ? strdup(long_desc) :
                                 desc ? strdup(desc) : NULL;
+        alias->topic = topic ? strdup(topic) : NULL;
 
         list_add_tail(&alias->list, list);
 
@@ -276,7 +278,7 @@ static int perf_pmu__new_alias(struct list_head *list, char *dir, char *name, FI
 
         buf[ret] = 0;
 
-        return __perf_pmu__new_alias(list, dir, name, NULL, buf, NULL);
+        return __perf_pmu__new_alias(list, dir, name, NULL, buf, NULL, NULL);
 }
 
 static inline bool pmu_alias_info_file(char *name)
@@ -535,7 +537,7 @@ static void pmu_add_cpu_aliases(struct list_head *head)
                 /* need type casts to override 'const' */
                 __perf_pmu__new_alias(head, NULL, (char *)pe->name,
                                 (char *)pe->desc, (char *)pe->event,
-                                (char *)pe->long_desc);
+                                (char *)pe->long_desc, (char *)pe->topic);
         }
 
 out:
@@ -1055,19 +1057,26 @@ static char *format_alias_or(char *buf, int len, struct perf_pmu *pmu,
         return buf;
 }
 
-struct pair {
+struct sevent {
         char *name;
         char *desc;
+        char *topic;
 };
 
-static int cmp_pair(const void *a, const void *b)
+static int cmp_sevent(const void *a, const void *b)
 {
-        const struct pair *as = a;
-        const struct pair *bs = b;
+        const struct sevent *as = a;
+        const struct sevent *bs = b;
 
         /* Put extra events last */
         if (!!as->desc != !!bs->desc)
                 return !!as->desc - !!bs->desc;
+        if (as->topic && bs->topic) {
+                int n = strcmp(as->topic, bs->topic);
+
+                if (n)
+                        return n;
+        }
         return strcmp(as->name, bs->name);
 }
 
@@ -1101,9 +1110,10 @@ void print_pmu_events(const char *event_glob, bool name_only, bool quiet_flag,
         char buf[1024];
         int printed = 0;
         int len, j;
-        struct pair *aliases;
+        struct sevent *aliases;
         int numdesc = 0;
         int columns = pager_get_columns();
+        char *topic = NULL;
 
         pmu = NULL;
         len = 0;
@@ -1113,7 +1123,7 @@ void print_pmu_events(const char *event_glob, bool name_only, bool quiet_flag,
                 if (pmu->selectable)
                         len++;
         }
-        aliases = zalloc(sizeof(struct pair) * len);
+        aliases = zalloc(sizeof(struct sevent) * len);
         if (!aliases)
                 goto out_enomem;
         pmu = NULL;
@@ -1144,6 +1154,7 @@ 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;
                         j++;
                 }
                 if (pmu->selectable &&
@@ -1156,7 +1167,7 @@ void print_pmu_events(const char *event_glob, bool name_only, bool quiet_flag,
                 }
         }
         len = j;
-        qsort(aliases, len, sizeof(struct pair), cmp_pair);
+        qsort(aliases, len, sizeof(struct sevent), cmp_sevent);
         for (j = 0; j < len; j++) {
                 if (name_only) {
                         printf("%s ", aliases[j].name);
@@ -1165,6 +1176,12 @@ void print_pmu_events(const char *event_glob, bool name_only, bool quiet_flag,
                 if (aliases[j].desc && !quiet_flag) {
                         if (numdesc++ == 0)
                                 printf("\n");
+                        if (aliases[j].topic && (!topic ||
+                                        strcmp(topic, aliases[j].topic))) {
+                                printf("%s%s:\n", topic ? "\n" : "",
+                                                aliases[j].topic);
+                                topic = aliases[j].topic;
+                        }
                         printf("  %-50s\n", aliases[j].name);
                         printf("%*s", 8, "[");
                         wordwrap(aliases[j].desc, 8, columns, 0);
diff --git a/tools/perf/util/pmu.h b/tools/perf/util/pmu.h
index 2fb8aa0fb47f..25712034c815 100644
--- a/tools/perf/util/pmu.h
+++ b/tools/perf/util/pmu.h
@@ -42,6 +42,7 @@ struct perf_pmu_alias {
         char *name;
         char *desc;
         char *long_desc;
+        char *topic;
         struct list_head terms; /* HEAD struct parse_events_term -> list */
         struct list_head list;  /* ELEM */
         char unit[UNIT_MAX_LEN+1];