This adds an option '--tracing-thresh' to setup trace duration threshold for funcgraph tracer.
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
