Re: [PATCH v12 bpf-next 02/12] fprobe: Add ftrace based probe APIs

[Steven Rostedt]

On Tue, 15 Mar 2022 23:00:38 +0900
Masami Hiramatsu <mhiramat@xxxxxxxxxx> wrote:

> +static void fprobe_init(struct fprobe *fp)
> +{
> +	fp->nmissed = 0;
> +	fp->ops.func = fprobe_handler;
> +	fp->ops.flags |= FTRACE_OPS_FL_SAVE_REGS;
> +}
> +

Masami,

I thought one of the advantages of fprobes over kprobes was that it did not
need to use SAVE_REGS, as that causes more overhead than SAVE_ARGS?

If fprobes uses save regs, what is the advantage of it over kprobes?

-- Steve