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>
diff --git a/tools/perf/builtin-mem.c b/tools/perf/builtin-mem.c
index b3f8a89..f1fa7b8 100644
--- a/tools/perf/builtin-mem.c
+++ b/tools/perf/builtin-mem.c
@@ -40,10 +40,11 @@
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 @@
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 @@
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);