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authorChangbin Du <changbin.du@gmail.com>2020-08-08 10:31:29 +0800
committerArnaldo Carvalho de Melo <acme@redhat.com>2020-08-14 08:59:16 -0300
commit5b34747238686021a39495f7ae0bfadc27fe3e83 (patch)
tree24c6dd5cd04542cc5ab1e0f301557661fad4ae76 /tools
parent81523c1e579bb95106e22b864fbef687d585f2b9 (diff)
downloadlinux-5b34747238686021a39495f7ae0bfadc27fe3e83.tar.bz2
perf ftrace: Add option '--inherit' to trace children processes
This adds an option '--inherit' to allow us trace children processes spawned by our target. Signed-off-by: Changbin Du <changbin.du@gmail.com> Acked-by: Namhyung Kim <namhyung@kernel.org> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Steven Rostedt (VMware) <rostedt@goodmis.org> Link: http://lore.kernel.org/lkml/20200808023141.14227-7-changbin.du@gmail.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools')
-rw-r--r--tools/perf/Documentation/perf-ftrace.txt3
-rw-r--r--tools/perf/builtin-ftrace.c38
2 files changed, 41 insertions, 0 deletions
diff --git a/tools/perf/Documentation/perf-ftrace.txt b/tools/perf/Documentation/perf-ftrace.txt
index 7a5d915f60b0..c46d0a09b38c 100644
--- a/tools/perf/Documentation/perf-ftrace.txt
+++ b/tools/perf/Documentation/perf-ftrace.txt
@@ -58,6 +58,9 @@ OPTIONS
Set the size of per-cpu tracing buffer, <size> is expected to
be a number with appended unit character - B/K/M/G.
+--inherit::
+ Trace children processes spawned by our target.
+
-T::
--trace-funcs=::
Select function tracer and set function filter on the given
diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c
index 39c694be2b71..07b81d0c1658 100644
--- a/tools/perf/builtin-ftrace.c
+++ b/tools/perf/builtin-ftrace.c
@@ -41,6 +41,7 @@ struct perf_ftrace {
struct list_head nograph_funcs;
int graph_depth;
unsigned long percpu_buffer_size;
+ bool inherit;
};
struct filter_entry {
@@ -182,9 +183,27 @@ static int write_tracing_file_int(const char *name, int value)
return 0;
}
+static int write_tracing_option_file(const char *name, const char *val)
+{
+ char *file;
+ int ret;
+
+ if (asprintf(&file, "options/%s", name) < 0)
+ return -1;
+
+ ret = __write_tracing_file(file, val, false);
+ free(file);
+ return ret;
+}
+
static int reset_tracing_cpu(void);
static void reset_tracing_filters(void);
+static void reset_tracing_options(struct perf_ftrace *ftrace __maybe_unused)
+{
+ write_tracing_option_file("function-fork", "0");
+}
+
static int reset_tracing_files(struct perf_ftrace *ftrace __maybe_unused)
{
if (write_tracing_file("tracing_on", "0") < 0)
@@ -203,6 +222,7 @@ static int reset_tracing_files(struct perf_ftrace *ftrace __maybe_unused)
return -1;
reset_tracing_filters();
+ reset_tracing_options(ftrace);
return 0;
}
@@ -341,6 +361,17 @@ static int set_tracing_percpu_buffer_size(struct perf_ftrace *ftrace)
return 0;
}
+static int set_tracing_trace_inherit(struct perf_ftrace *ftrace)
+{
+ if (!ftrace->inherit)
+ 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;
@@ -410,6 +441,11 @@ static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char **argv)
goto out_reset;
}
+ if (set_tracing_trace_inherit(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;
@@ -618,6 +654,8 @@ int cmd_ftrace(int argc, const char **argv)
"Max depth for function graph tracer"),
OPT_CALLBACK('m', "buffer-size", &ftrace.percpu_buffer_size, "size",
"size of per cpu buffer", parse_buffer_size),
+ OPT_BOOLEAN(0, "inherit", &ftrace.inherit,
+ "trace children processes"),
OPT_END()
};