Em Sun, May 10, 2020 at 11:06:21PM +0800, Changbin Du escreveu: > This adds an option '--trace-children' to allow us trace children > processes spawned by our target.
--inherit - Arnaldo > Signed-off-by: Changbin Du <[email protected]> > --- > tools/perf/builtin-ftrace.c | 20 ++++++++++++++++++++ > 1 file changed, 20 insertions(+) > > diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c > index ab76ba66bd9e..8fd95c109fe8 100644 > --- a/tools/perf/builtin-ftrace.c > +++ b/tools/perf/builtin-ftrace.c > @@ -46,6 +46,7 @@ struct perf_ftrace { > bool funcgraph_tail; > bool long_info; > unsigned tracing_thresh; > + bool trace_children; > }; > > struct filter_entry { > @@ -200,6 +201,7 @@ static void reset_tracing_options(struct perf_ftrace > *ftrace __maybe_unused) > write_tracing_option_file("irq-info", "0"); > write_tracing_option_file("userstacktrace", "0"); > write_tracing_option_file("sym-userobj", "0"); > + write_tracing_option_file("function-fork", "0"); > } > > static int reset_tracing_files(struct perf_ftrace *ftrace __maybe_unused) > @@ -441,6 +443,17 @@ static int set_tracing_funcgraph_tail(struct perf_ftrace > *ftrace) > return 0; > } > > +static int set_tracing_trace_children(struct perf_ftrace *ftrace) > +{ > + if (!ftrace->trace_children) > + return 0; > + > + if (write_tracing_option_file("function-fork", "1") < 0) > + return -1; > + > + return 0; > +} > + > static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char > **argv) > { > char *trace_file; > @@ -539,6 +552,11 @@ static int __cmd_ftrace(struct perf_ftrace *ftrace, int > argc, const char **argv) > goto out_reset; > } > > + if (set_tracing_trace_children(ftrace) < 0) { > + pr_err("failed to set tracing option function-fork\n"); > + goto out_reset; > + } > + > if (write_tracing_file("current_tracer", ftrace->tracer) < 0) { > pr_err("failed to set current_tracer to %s\n", ftrace->tracer); > goto out_reset; > @@ -686,6 +704,8 @@ int cmd_ftrace(int argc, const char **argv) > "Show process names, PIDs, timestamps, irq-info if > available"), > OPT_UINTEGER(0, "tracing-thresh", &ftrace.tracing_thresh, > "Only show functions of which the duration is greater than > <n>µs"), > + OPT_BOOLEAN(0, "trace-children", &ftrace.trace_children, > + "Trace children processes"), > OPT_END() > }; > > -- > 2.25.1 > -- - Arnaldo
