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perf list: Add usage

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Currently 'perf list' is not very helpful if you forget the syntax:

  $ perf list -h

  List of pre-defined events (to be used in -e):

After:
  $ perf list -h

   usage: perf list [hw|sw|cache|tracepoint|pmu|event_glob]

Signed-off-by: David Ahern <dsahern@gmail.com>
Acked-by: Ingo Molnar <mingo@kernel.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/527133AD.4030003@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
David Ahern 2013-10-30 10:28:29 -06:00 committed by Arnaldo Carvalho de Melo
parent 8e00ddc9df
commit 44d742e01e
1 changed files with 14 additions and 3 deletions
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17
tools/perf/builtin-list.c
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@ -14,20 +14,31 @@
#include "util/parse-events.h" #include "util/parse-events.h"
#include "util/cache.h" #include "util/cache.h"
#include "util/pmu.h" #include "util/pmu.h"
#include "util/parse-options.h"
int cmd_list(int argc, const char **argv, const char *prefix __maybe_unused) int cmd_list(int argc, const char **argv, const char *prefix __maybe_unused)
{ {
int i; int i;
const struct option list_options[] = {
OPT_END()
};
const char * const list_usage[] = {
"perf list [hw|sw|cache|tracepoint|pmu|event_glob]",
NULL
};
argc = parse_options(argc, argv, list_options, list_usage,
PARSE_OPT_STOP_AT_NON_OPTION);
setup_pager(); setup_pager();
if (argc == 1) { if (argc == 0) {
print_events(NULL, false); print_events(NULL, false);
return 0; return 0;
} }
for (i = 1; i < argc; ++i) { for (i = 0; i < argc; ++i) {
if (i > 2) if (i)
putchar('\n'); putchar('\n');
if (strncmp(argv[i], "tracepoint", 10) == 0) if (strncmp(argv[i], "tracepoint", 10) == 0)
print_tracepoint_events(NULL, NULL, false); print_tracepoint_events(NULL, NULL, false);