Added internal options for ftrace, and included a fgraph:retval option that will print the function names at the function exit. When the option is set and the function_graph retval feature is supported by the kernel, each function's return value will be printed as '(ret=retval)'. Signed-off-by: Jianfeng Wang <jianfeng.w.wang@xxxxxxxxxx> --- lib/trace-cmd/trace-ftrace.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/lib/trace-cmd/trace-ftrace.c b/lib/trace-cmd/trace-ftrace.c index cb05d88c..fecc3d69 100644 --- a/lib/trace-cmd/trace-ftrace.c +++ b/lib/trace-cmd/trace-ftrace.c @@ -23,6 +23,12 @@ struct tep_plugin_option trace_ftrace_options[] = { .description = "Show the depth of each entry", }, + { + .name = "retval", + .plugin_alias = "fgraph", + .description = + "Print function retval at function exit in function graph", + }, { .name = NULL, } @@ -30,6 +36,7 @@ struct tep_plugin_option trace_ftrace_options[] = { static struct tep_plugin_option *fgraph_tail = &trace_ftrace_options[0]; static struct tep_plugin_option *fgraph_depth = &trace_ftrace_options[1]; +static struct tep_plugin_option *fgraph_retval = &trace_ftrace_options[2]; static int find_ret_event(struct tracecmd_ftrace *finfo, struct tep_handle *pevent) { @@ -232,7 +239,7 @@ print_graph_entry_leaf(struct trace_seq *s, ret = trace_seq_printf(s, " (%lld)", depth); /* Return Value */ - if (ret && fgraph_retval_supported) + if (ret && fgraph_retval->set && fgraph_retval_supported) ret = trace_seq_printf(s, " (ret=%lld)", retval); return ret; @@ -378,7 +385,7 @@ fgraph_ret_handler(struct trace_seq *s, struct tep_record *record, trace_seq_printf(s, " (%lld)", depth); /* Return Value */ - if (fgraph_retval_supported) + if (fgraph_retval->set && fgraph_retval_supported) trace_seq_printf(s, " (ret=%lld)", retval); return 0; -- 2.42.1
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