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SubjectRe: [PATCH v12 bpf-next 02/12] fprobe: Add ftrace based probe APIs
On Tue, 15 Mar 2022 23:00:38 +0900
Masami Hiramatsu <mhiramat@kernel.org> 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

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