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perf trace: Add support for tracing workload given by command line

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Now perf trace is able to trace specified workload by forking it like
perf record does.  And also finish the tracing if the workload quits or
gets SIGINT.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1349413336-26936-5-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Namhyung Kim 2012-10-05 14:02:16 +09:00 committed by Arnaldo Carvalho de Melo
parent ee76120e2d
commit f15eb531d3
1 changed files with 36 additions and 7 deletions
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43
tools/perf/builtin-trace.c
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@ -52,6 +52,13 @@ struct trace {
struct perf_record_opts opts;
};
static bool done = false;
static void sig_handler(int sig __maybe_unused)
{
done = true;
}
static int trace__read_syscall_info(struct trace *trace, int id)
{
char tp_name[128];
@ -189,11 +196,12 @@ static int trace__sys_exit(struct trace *trace, struct perf_evsel *evsel,
return 0;
}
static int trace__run(struct trace *trace)
static int trace__run(struct trace *trace, int argc, const char **argv)
{
struct perf_evlist *evlist = perf_evlist__new(NULL, NULL);
struct perf_evsel *evsel;
int err = -1, i, nr_events = 0, before;
const bool forks = argc > 0;
if (evlist == NULL) {
printf("Not enough memory to run!\n");
@ -214,6 +222,17 @@ static int trace__run(struct trace *trace)
perf_evlist__config_attrs(evlist, &trace->opts);
signal(SIGCHLD, sig_handler);
signal(SIGINT, sig_handler);
if (forks) {
err = perf_evlist__prepare_workload(evlist, &trace->opts, argv);
if (err < 0) {
printf("Couldn't run the workload!\n");
goto out_delete_evlist;
}
}
err = perf_evlist__open(evlist);
if (err < 0) {
printf("Couldn't create the events: %s\n", strerror(errno));
@ -227,6 +246,10 @@ static int trace__run(struct trace *trace)
}
perf_evlist__enable(evlist);
if (forks)
perf_evlist__start_workload(evlist);
again:
before = nr_events;
@ -272,8 +295,15 @@ again:
}
}
if (nr_events == before)
if (nr_events == before) {
if (done)
goto out_delete_evlist;
poll(evlist->pollfd, evlist->nr_fds, -1);
}
if (done)
perf_evlist__disable(evlist);
goto again;
@ -286,7 +316,8 @@ out:
int cmd_trace(int argc, const char **argv, const char *prefix __maybe_unused)
{
const char * const trace_usage[] = {
"perf trace [<options>]",
"perf trace [<options>] [<command>]",
"perf trace [<options>] -- <command> [<options>]",
NULL
};
struct trace trace = {
@ -326,8 +357,6 @@ int cmd_trace(int argc, const char **argv, const char *prefix __maybe_unused)
char bf[BUFSIZ];
argc = parse_options(argc, argv, trace_options, trace_usage, 0);
if (argc)
usage_with_options(trace_usage, trace_options);
err = perf_target__validate(&trace.opts.target);
if (err) {
@ -343,8 +372,8 @@ int cmd_trace(int argc, const char **argv, const char *prefix __maybe_unused)
return err;
}
if (perf_target__none(&trace.opts.target))
if (!argc && perf_target__none(&trace.opts.target))
trace.opts.target.system_wide = true;
return trace__run(&trace);
return trace__run(&trace, argc, argv);
}