[v3,0/2] trace-cmd report: support function retval in function_graph

Message

Jianfeng Wang July 17, 2024, 11:17 p.m. UTC

The upstream Linux kernel has introduced a funcgraph retval feature
for the function_graph tracer. (Commit ID:
a1be9ccc57f07d54278be34eed6bd679bc941c97). This patchset is to utilize
this feature to support printing each function's return value in
'trace-cmd report'. Add three fgraph options so that users can skip
the printing, and force the return values to be printed in decimal
or in hex format.

Change history:
===============
v3:
- Fix code format.
- Add fgraph:retval-dec option.

v2:
- Check if a retval is an error code: if not, print it in hex.
- Make this retval feature on by default.
- Add fgraph:retval-skip and fgraph:retval-hex options.

v1: https://lore.kernel.org/linux-trace-devel/[e-mail]

Jianfeng Wang (2):
  trace-cmd report: Print function retval in function_graph
  trace-cmd report: Add options for the fgraph retval feature

 lib/trace-cmd/trace-ftrace.c | 72 ++++++++++++++++++++++++++++++++++++
 1 file changed, 72 insertions(+)