From f15eb531d351163f1ea697c2dd8f15b66b01d289 Mon Sep 17 00:00:00 2001 From: Namhyung Kim Date: Fri, 5 Oct 2012 14:02:16 +0900 Subject: [PATCH] perf trace: Add support for tracing workload given by command line 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 Cc: Ingo Molnar Cc: Paul Mackerras Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/1349413336-26936-5-git-send-email-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/builtin-trace.c | 43 +++++++++++++++++++++++++++++++------- 1 file changed, 36 insertions(+), 7 deletions(-) diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c index da1183fa105a..4e9320bf11e1 100644 --- a/tools/perf/builtin-trace.c +++ b/tools/perf/builtin-trace.c @@ -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 []", + "perf trace [] []", + "perf trace [] -- []", 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); } -- 2.20.1