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 two fgraph options so that users can skip the printing or force the return values to be printed in hex. Change history: =============== 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/20240415154921.4998-1-jianfeng.w.wang@xxxxxxxxxx Jianfeng Wang (2): trace-cmd ftrace: print function retval in function_graph trace-cmd: Add ftrace options for the fgraph retval feature lib/trace-cmd/trace-ftrace.c | 51 ++++++++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) -- 2.42.1
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