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perf lock record: improve message when tracepoints are not enabled

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If CONFIG options required for perf-lock are not enabled then the
corresponding tracepoints will not be enabled. Currently, the message to
the user is:
  $ perf lock record -a -- sleep 1
  invalid or unsupported event: 'lock:lock_acquire'
  Run 'perf list' for a list of valid events

Improve the message with a suggestion on which CONFIG options are needed:
  $ perf lock record -a -- sleep 1
  tracepoint lock:lock_acquire is not enabled. Are CONFIG_LOCKDEP and CONFIG_LOCK_STAT enabled?

Suggested-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: David Ahern <dsahern@gmail.com>
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>
Link: http://lkml.kernel.org/r/1344530137-25521-1-git-send-email-dsahern@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
David Ahern 2012-08-09 10:35:37 -06:00 committed by Arnaldo Carvalho de Melo
parent 87b6a3ad40
commit d25dcba854
1 changed files with 25 additions and 6 deletions
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31
tools/perf/builtin-lock.c
View file

@ -903,16 +903,19 @@ static const struct option lock_options[] = {
OPT_END()
};
static const char * const lock_tracepoints[] = {
"lock:lock_acquire", /* CONFIG_LOCKDEP */
"lock:lock_acquired", /* CONFIG_LOCKDEP, CONFIG_LOCK_STAT */
"lock:lock_contended", /* CONFIG_LOCKDEP, CONFIG_LOCK_STAT */
"lock:lock_release", /* CONFIG_LOCKDEP */
};
static const char *record_args[] = {
"record",
"-R",
"-f",
"-m", "1024",
"-c", "1",
"-e", "lock:lock_acquire",
"-e", "lock:lock_acquired",
"-e", "lock:lock_contended",
"-e", "lock:lock_release",
};
static int __cmd_record(int argc, const char **argv)
@ -920,15 +923,31 @@ static int __cmd_record(int argc, const char **argv)
unsigned int rec_argc, i, j;
const char **rec_argv;
rec_argc = ARRAY_SIZE(record_args) + argc - 1;
rec_argv = calloc(rec_argc + 1, sizeof(char *));
for (i = 0; i < ARRAY_SIZE(lock_tracepoints); i++) {
if (!is_valid_tracepoint(lock_tracepoints[i])) {
pr_err("tracepoint %s is not enabled. "
"Are CONFIG_LOCKDEP and CONFIG_LOCK_STAT enabled?\n",
lock_tracepoints[i]);
return 1;
}
}
rec_argc = ARRAY_SIZE(record_args) + argc - 1;
/* factor of 2 is for -e in front of each tracepoint */
rec_argc += 2 * ARRAY_SIZE(lock_tracepoints);
rec_argv = calloc(rec_argc + 1, sizeof(char *));
if (rec_argv == NULL)
return -ENOMEM;
for (i = 0; i < ARRAY_SIZE(record_args); i++)
rec_argv[i] = strdup(record_args[i]);
for (j = 0; j < ARRAY_SIZE(lock_tracepoints); j++) {
rec_argv[i++] = "-e";
rec_argv[i++] = strdup(lock_tracepoints[j]);
}
for (j = 1; j < (unsigned int)argc; j++, i++)
rec_argv[i] = argv[j];