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authorNamhyung Kim <namhyung@kernel.org>2017-06-18 17:23:02 +0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2017-06-20 04:05:54 +0300
commit1096c35aa821cc4789a64232a0e210bb87a0e5e8 (patch)
treee8c980a69b3b768e029da7850b077efc1110175b /tools/perf
parent78b83e8b12b4467540ca501c7c019e9d46051957 (diff)
downloadlinux-1096c35aa821cc4789a64232a0e210bb87a0e5e8.tar.xz
perf ftrace: Add -D option for depth filter
The -D/--graph-depth option is to set max graph depth. The following example traces max 2-depth of page fault handler. $ sudo perf ftrace -G __do_page_fault -D 2 -- hello ... 0) | __do_page_fault() { 0) 0.063 us | down_read_trylock(); 0) 0.251 us | find_vma(); 0) 5.374 us | handle_mm_fault(); 0) 0.054 us | up_read(); 0) 7.463 us | } ... Signed-off-by: Namhyung Kim <namhyung@kernel.org> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: kernel-team@lge.com Link: http://lkml.kernel.org/r/20170618142302.25390-4-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf')
-rw-r--r--tools/perf/Documentation/perf-ftrace.txt3
-rw-r--r--tools/perf/builtin-ftrace.c31
2 files changed, 34 insertions, 0 deletions
diff --git a/tools/perf/Documentation/perf-ftrace.txt b/tools/perf/Documentation/perf-ftrace.txt
index 78d6126ca485..721a447f046e 100644
--- a/tools/perf/Documentation/perf-ftrace.txt
+++ b/tools/perf/Documentation/perf-ftrace.txt
@@ -78,6 +78,9 @@ OPTIONS
This can be used more than once to specify multiple functions.
It will be passed to 'set_graph_notrace' in tracefs.
+-D::
+--graph-depth=::
+ Set max depth for function graph tracer to follow
SEE ALSO
--------
diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c
index 3285375ce3c2..dd26c62c9893 100644
--- a/tools/perf/builtin-ftrace.c
+++ b/tools/perf/builtin-ftrace.c
@@ -35,6 +35,7 @@ struct perf_ftrace {
struct list_head notrace;
struct list_head graph_funcs;
struct list_head nograph_funcs;
+ int graph_depth;
};
struct filter_entry {
@@ -129,6 +130,9 @@ static int reset_tracing_files(struct perf_ftrace *ftrace __maybe_unused)
if (reset_tracing_cpu() < 0)
return -1;
+ if (write_tracing_file("max_graph_depth", "0") < 0)
+ return -1;
+
reset_tracing_filters();
return 0;
}
@@ -237,6 +241,26 @@ static void reset_tracing_filters(void)
write_tracing_file("set_graph_notrace", " ");
}
+static int set_tracing_depth(struct perf_ftrace *ftrace)
+{
+ char buf[16];
+
+ if (ftrace->graph_depth == 0)
+ return 0;
+
+ if (ftrace->graph_depth < 0) {
+ pr_err("invalid graph depth: %d\n", ftrace->graph_depth);
+ return -1;
+ }
+
+ snprintf(buf, sizeof(buf), "%d", ftrace->graph_depth);
+
+ if (write_tracing_file("max_graph_depth", buf) < 0)
+ return -1;
+
+ return 0;
+}
+
static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char **argv)
{
char *trace_file;
@@ -284,6 +308,11 @@ static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char **argv)
goto out_reset;
}
+ if (set_tracing_depth(ftrace) < 0) {
+ pr_err("failed to set graph depth\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;
@@ -425,6 +454,8 @@ int cmd_ftrace(int argc, const char **argv)
"Set graph filter on given functions", parse_filter_func),
OPT_CALLBACK('g', "nograph-funcs", &ftrace.nograph_funcs, "func",
"Set nograph filter on given functions", parse_filter_func),
+ OPT_INTEGER('D', "graph-depth", &ftrace.graph_depth,
+ "Max depth for function graph tracer"),
OPT_END()
};