Em Sun, May 10, 2020 at 11:06:18PM +0800, Changbin Du escreveu: > This adds an option '--tracing-thresh' to setup trace duration threshold > for funcgraph tracer.
Ditto > Signed-off-by: Changbin Du <[email protected]> > --- > tools/perf/builtin-ftrace.c | 26 ++++++++++++++++++++++++++ > 1 file changed, 26 insertions(+) > > diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c > index f11f2d3431b0..20bc14d6c5fb 100644 > --- a/tools/perf/builtin-ftrace.c > +++ b/tools/perf/builtin-ftrace.c > @@ -43,6 +43,7 @@ struct perf_ftrace { > bool nosleep_time; > bool nofuncgraph_irqs; > bool long_info; > + unsigned tracing_thresh; > }; > > struct filter_entry { > @@ -213,6 +214,9 @@ static int reset_tracing_files(struct perf_ftrace *ftrace > __maybe_unused) > if (write_tracing_file("max_graph_depth", "0") < 0) > return -1; > > + if (write_tracing_file("tracing_thresh", "0") < 0) > + return -1; > + > reset_tracing_filters(); > reset_tracing_options(ftrace); > return 0; > @@ -392,6 +396,21 @@ static int set_tracing_long_info(struct perf_ftrace > *ftrace) > return 0; > } > > +static int set_tracing_thresh(struct perf_ftrace *ftrace) > +{ > + char buf[16]; > + > + if (ftrace->tracing_thresh == 0) > + return 0; > + > + snprintf(buf, sizeof(buf), "%d", ftrace->tracing_thresh); > + > + if (write_tracing_file("tracing_thresh", buf) < 0) > + return -1; > + > + return 0; > +} > + > static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char > **argv) > { > char *trace_file; > @@ -475,6 +494,11 @@ static int __cmd_ftrace(struct perf_ftrace *ftrace, int > argc, const char **argv) > goto out_reset; > } > > + if (set_tracing_thresh(ftrace) < 0) { > + pr_err("failed to set tracing thresh\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; > @@ -616,6 +640,8 @@ int cmd_ftrace(int argc, const char **argv) > "Ignore functions that happen inside interrupt > (function_graph only)"), > OPT_BOOLEAN('l', "long-info", &ftrace.long_info, > "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_END() > }; > > -- > 2.25.1 > -- - Arnaldo
