perf mem record: Check for memory events support

Check if current kernel support available memory events and display the
status within -e  list option:

  $ perf mem record -e list
  ldlat-loads  : available
  ldlat-stores : available

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1456303616-26926-2-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 16 insertions, 4 deletions

diff --git a/tools/perf/builtin-mem.c b/tools/perf/builtin-mem.c
index b3f8a89ede40..f1fa7b8d1f69 100644
--- a/tools/perf/builtin-mem.c
+++ b/tools/perf/builtin-mem.c
@@ -40,10 +40,11 @@ static int parse_record_events(const struct option *opt,
         for (j = 0; j < PERF_MEM_EVENTS__MAX; j++) {
                 struct perf_mem_event *e = &perf_mem_events[j];
 
-                fprintf(stderr, "%-20s%s",
-                        e->tag, verbose ? "" : "\n");
-                if (verbose)
-                        fprintf(stderr, " [%s]\n", e->name);
+                fprintf(stderr, "%-13s%-*s%s\n",
+                        e->tag,
+                        verbose ? 25 : 0,
+                        verbose ? e->name : "",
+                        e->supported ? ": available" : "");
         }
         exit(0);
 }
@@ -92,6 +93,12 @@ static int __cmd_record(int argc, const char **argv, struct perf_mem *mem)
                 if (!perf_mem_events[j].record)
                         continue;
 
+                if (!perf_mem_events[j].supported) {
+                        pr_err("failed: event '%s' not supported\n",
+                               perf_mem_events[j].name);
+                        return -1;
+                }
+
                 rec_argv[i++] = "-e";
                 rec_argv[i++] = perf_mem_events[j].name;
         };
@@ -355,6 +362,11 @@ int cmd_mem(int argc, const char **argv, const char *prefix __maybe_unused)
                 NULL
         };
 
+        if (perf_mem_events__init()) {
+                pr_err("failed: memory events not supported\n");
+                return -1;
+        }
+
         argc = parse_options_subcommand(argc, argv, mem_options, mem_subcommands,
                                         mem_usage, PARSE_OPT_STOP_AT_NON_OPTION);