This adds an option '--graph-opts thresh' to setup trace duration
threshold for funcgraph tracer.
$ sudo ./perf ftrace -G '*' --graph-opts thresh=100
3) ! 184.060 us | } /* schedule */
3) ! 185.600 us | } /* exit_to_usermode_loop */
2) ! 225.989 us | } /* schedule_idle */
2) # 4140.051 us | } /* do_idle */
Signed-off-by: Changbin Du <changbin...@gmail.com>
---
tools/perf/Documentation/perf-ftrace.txt | 1 +
tools/perf/builtin-ftrace.c | 26 +++++++++++++++++++++++-
2 files changed, 26 insertions(+), 1 deletion(-)
diff --git a/tools/perf/Documentation/perf-ftrace.txt
b/tools/perf/Documentation/perf-ftrace.txt
index 319ec6375228..96e5e8d7f65c 100644
--- a/tools/perf/Documentation/perf-ftrace.txt
+++ b/tools/perf/Documentation/perf-ftrace.txt
@@ -104,6 +104,7 @@ OPTIONS
nosleep-time - Measure on-CPU time only for function_graph tracer.
noirqs - Ignore functions that happen inside interrupt.
verbose - Show process names, PIDs, timestamps, etc.
+ thresh=<n> - Setup trace duration threshold in microseconds.
SEE ALSO
--------
diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c
index 0d893d97691d..5d948239bd70 100644
--- a/tools/perf/builtin-ftrace.c
+++ b/tools/perf/builtin-ftrace.c
@@ -46,6 +46,7 @@ struct perf_ftrace {
int graph_nosleep_time;
int graph_noirqs;
int graph_verbose;
+ int graph_thresh;
};
struct filter_entry {
@@ -232,6 +233,9 @@ 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;
@@ -444,6 +448,20 @@ static int set_tracing_funcgraph_verbose(struct
perf_ftrace *ftrace)
return 0;
}
+static int set_tracing_thresh(struct perf_ftrace *ftrace)
+{
+ int ret;
+
+ if (ftrace->graph_thresh == 0)
+ return 0;
+
+ ret = write_tracing_file_int("tracing_thresh", ftrace->graph_thresh);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char
**argv)
{
char *trace_file;
@@ -543,6 +561,11 @@ 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;
@@ -726,6 +749,7 @@ static int parse_graph_tracer_opts(const struct option *opt,
{ .name = "nosleep-time", .value_ptr =
&ftrace->graph_nosleep_time },
{ .name = "noirqs", .value_ptr =
&ftrace->graph_noirqs },
{ .name = "verbose", .value_ptr =
&ftrace->graph_verbose },
+ { .name = "thresh", .value_ptr =
&ftrace->graph_thresh },
{ .name = NULL, }
};
@@ -780,7 +804,7 @@ int cmd_ftrace(int argc, const char **argv)
OPT_INTEGER('D', "graph-depth", &ftrace.graph_depth,
"Max depth for function graph tracer"),
OPT_CALLBACK(0, "graph-opts", &ftrace, "options",
- "graph tracer options, available options:
nosleep-time,noirqs,verbose",
+ "graph tracer options, available options:
nosleep-time,noirqs,verbose,thresh=<n>",
parse_graph_tracer_opts),
OPT_CALLBACK('m', "buffer-size", &ftrace.percpu_buffer_size, "size",
"size of per cpu buffer", parse_buffer_size),
--
2.25.1
