For now, fgraph is used for the fprobe, even if we need trace the entry
only. However, the performance of ftrace is better than fgraph, and we
can use ftrace_ops for this case.
Then performance of kprobe-multi increases from 54M to 69M. Before this
commit:
$ ./benchs/run_bench_trigger.sh kprobe-multi
kprobe-multi : 54.663 ± 0.493M/s
After this commit:
$ ./benchs/run_bench_trigger.sh kprobe-multi
kprobe-multi : 69.447 ± 0.143M/s
Mitigation is disable during the bench testing above.
Link: https://lore.kernel.org/all/20251015083238.2374294-2-dongml2@chinatelecom.cn/
Signed-off-by: Menglong Dong <dongml2@chinatelecom.cn>
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
2c67dc457b