Re: [PATCH 3/3] trace_kprobes: don't output zero offset

Masami Hiramatsu
2009-11-25T12:58:21Z

Hi Lai,

Lai Jiangshan wrote:
>
> "symbol_name+0" is not so friendly.
> It makes the output longer.

Hmm, I've added +0 just for convenience of parser programs.
But anyway, skipping it is not so costly option for them :-)

Acked-by: Masami Hiramatsu <mhiramat@redhat.com>

>
> Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
> ---
> diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
> index 9e42f2a..e82bea3 100644
> --- a/kernel/trace/trace_kprobe.c
> +++ b/kernel/trace/trace_kprobe.c
> @@ -243,7 +243,11 @@ static int probe_arg_string(char *buf, size_t n, struct fetch_func *ff)
> ret = snprintf(buf, n, "@0x%p", ff->data);
> else if (ff->func == fetch_symbol) {
> struct symbol_cache *sc = ff->data;
> - ret = snprintf(buf, n, "@%s%+ld", sc->symbol, sc->offset);
> + if (sc->offset)
> + ret = snprintf(buf, n, "@%s%+ld", sc->symbol,
> + sc->offset);
> + else
> + ret = snprintf(buf, n, "@%s", sc->symbol);
> } else if (ff->func == fetch_retvalue)
> ret = snprintf(buf, n, "$retval");
> else if (ff->func == fetch_stack_address)
> @@ -760,10 +764,12 @@ static int probes_seq_show(struct seq_file *m, void *v)
> seq_printf(m, "%c", probe_is_return(tp) ? 'r' : 'p');
> seq_printf(m, ":%s/%s", tp->call.system, tp->call.name);
>
> - if (tp->symbol)
> + if (!tp->symbol)
> + seq_printf(m, " 0x%p", tp->rp.kp.addr);
> + else if (tp->rp.kp.offset)
> seq_printf(m, " %s+%u", probe_symbol(tp), tp->rp.kp.offset);
> else
> - seq_printf(m, " 0x%p", tp->rp.kp.addr);
> + seq_printf(m, " %s", probe_symbol(tp));
>
> for (i = 0; i < tp->nr_args; i++) {
> ret = probe_arg_string(buf, MAX_ARGSTR_LEN, &tp->args[i].fetch);
>
>

--
Masami Hiramatsu

Software Engineer
Hitachi Computer Products (America), Inc.
Software Solutions Division

e-mail: mhiramat@redhat.com