This adds support to display call trace for function tracer. To do this, just specify a '-s' option.
$ sudo perf ftrace -T vfs_read -s iio-sensor-prox-855 [003] 6168.369657: vfs_read <-ksys_read iio-sensor-prox-855 [003] 6168.369677: <stack trace> => vfs_read => ksys_read => __x64_sys_read => do_syscall_64 => entry_SYSCALL_64_after_hwframe ... Signed-off-by: Changbin Du <[email protected]> --- tools/perf/builtin-ftrace.c | 38 +++++++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c index 57e656c35d28..1d30c2d5f88b 100644 --- a/tools/perf/builtin-ftrace.c +++ b/tools/perf/builtin-ftrace.c @@ -38,6 +38,7 @@ struct perf_ftrace { struct list_head graph_funcs; struct list_head nograph_funcs; int graph_depth; + bool func_stack_trace; }; struct filter_entry { @@ -128,9 +129,27 @@ static int append_tracing_file(const char *name, const char *val) return __write_tracing_file(name, val, true); } +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("func_stack_trace", "0"); +} + static int reset_tracing_files(struct perf_ftrace *ftrace __maybe_unused) { if (write_tracing_file("tracing_on", "0") < 0) @@ -149,6 +168,7 @@ static int reset_tracing_files(struct perf_ftrace *ftrace __maybe_unused) return -1; reset_tracing_filters(); + reset_tracing_options(ftrace); return 0; } @@ -204,6 +224,17 @@ static int set_tracing_cpu(struct perf_ftrace *ftrace) return set_tracing_cpumask(cpumap); } +static int set_tracing_func_stack_trace(struct perf_ftrace *ftrace) +{ + if (!ftrace->func_stack_trace) + return 0; + + if (write_tracing_option_file("func_stack_trace", "1") < 0) + return -1; + + return 0; +} + static int reset_tracing_cpu(void) { struct perf_cpu_map *cpumap = perf_cpu_map__new(NULL); @@ -326,6 +357,11 @@ static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char **argv) goto out_reset; } + if (set_tracing_func_stack_trace(ftrace) < 0) { + pr_err("failed to set tracing option func_stack_trace\n"); + goto out_reset; + } + if (set_tracing_filters(ftrace) < 0) { pr_err("failed to set tracing filters\n"); goto out_reset; @@ -459,6 +495,8 @@ int cmd_ftrace(int argc, const char **argv) "trace given functions only", parse_filter_func), OPT_CALLBACK('N', "notrace-funcs", &ftrace.notrace, "func", "do not trace given functions", parse_filter_func), + OPT_BOOLEAN('s', "func-stack-trace", &ftrace.func_stack_trace, + "Show kernel stack trace for function tracer"), OPT_CALLBACK_DEFAULT('G', "graph-funcs", &ftrace.graph_funcs, "func", "Set graph filter on given functions (imply to use function_graph tracer)", parse_filter_func, "*"), -- 2.25.1
