This adds an option ''-u/--userstacktrace' for function tracer to display userspace back trace.
Signed-off-by: Changbin Du <[email protected]> --- tools/perf/builtin-ftrace.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c index 2ef5d1c4b23c..ab76ba66bd9e 100644 --- a/tools/perf/builtin-ftrace.c +++ b/tools/perf/builtin-ftrace.c @@ -40,6 +40,7 @@ struct perf_ftrace { struct list_head nograph_funcs; int graph_depth; bool func_stack_trace; + bool userstacktrace; bool nosleep_time; bool nofuncgraph_irqs; bool funcgraph_tail; @@ -197,6 +198,8 @@ static void reset_tracing_options(struct perf_ftrace *ftrace __maybe_unused) write_tracing_option_file("funcgraph-proc", "0"); write_tracing_option_file("funcgraph-abstime", "0"); write_tracing_option_file("irq-info", "0"); + write_tracing_option_file("userstacktrace", "0"); + write_tracing_option_file("sym-userobj", "0"); } static int reset_tracing_files(struct perf_ftrace *ftrace __maybe_unused) @@ -287,6 +290,20 @@ static int set_tracing_func_stack_trace(struct perf_ftrace *ftrace) return 0; } +static int set_tracing_userstacktrace(struct perf_ftrace *ftrace) +{ + if (!ftrace->userstacktrace) + return 0; + + if (write_tracing_option_file("userstacktrace", "1") < 0) + return -1; + + if (write_tracing_option_file("sym-userobj", "1") < 0) + return -1; + + return 0; +} + static int reset_tracing_cpu(void) { struct perf_cpu_map *cpumap = perf_cpu_map__new(NULL); @@ -482,6 +499,11 @@ static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char **argv) goto out_reset; } + if (set_tracing_userstacktrace(ftrace) < 0) { + pr_err("failed to set tracing option userstacktrace\n"); + goto out_reset; + } + if (set_tracing_filters(ftrace) < 0) { pr_err("failed to set tracing filters\n"); goto out_reset; @@ -644,6 +666,8 @@ int cmd_ftrace(int argc, const char **argv) "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_BOOLEAN('u', "userstacktrace", &ftrace.userstacktrace, + "Show stacktrace of the current user space thread"), 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
