linux-kernel - Re: [PATCH v2 3/3] perf probe: Show better error message when failed to find variable

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Date:	Sun, 10 May 2015 12:23:03 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	He Kuang <hekuang@...wei.com>, a.p.zijlstra@...llo.nl,
	acme@...nel.org, jolsa@...nel.org, mingo@...hat.com
CC:	wangnan0@...wei.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/3] perf probe: Show better error message when failed
 to find variable

On 2015/05/09 18:55, He Kuang wrote:
> Indicate to check variable location range in error message when we got
> failed to find the variable.
> 
> Before this patch:
> 
>   $ perf probe --add 'generic_perform_write+118 bytes'
>   Failed to find the location of bytes at this address.
>    Perhaps, it has been optimized out.
>     Error: Failed to add events.
> 
> After this patch:
>   $ perf probe --add 'generic_perform_write+118 bytes'
>   Failed to find the location of bytes at this address.
>    Perhaps, it has been optimized out.
>    Use -V with --range option to show variable location range.
>     Error: Failed to add events.

OK, this helps users :)

Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>


Thank you,

> 
> Signed-off-by: He Kuang <hekuang@...wei.com>
> ---
>  tools/perf/util/probe-finder.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
> index 30a1a1b..2b91323 100644
> --- a/tools/perf/util/probe-finder.c
> +++ b/tools/perf/util/probe-finder.c
> @@ -532,7 +532,9 @@ static int convert_variable(Dwarf_Die *vr_die, struct probe_finder *pf)
>  					&pf->sp_die, pf->tvar);
>  	if (ret == -ENOENT || ret == -EINVAL)
>  		pr_err("Failed to find the location of %s at this address.\n"
> -		       " Perhaps, it has been optimized out.\n", pf->pvar->var);
> +		       " Perhaps, it has been optimized out.\n"
> +		       " Use -V with --range option to show variable location range.\n",
> +		       pf->pvar->var);
>  	else if (ret == -ENOTSUP)
>  		pr_err("Sorry, we don't support this variable location yet.\n");
>  	else if (ret == 0 && pf->pvar->field) {
> 


-- 
Masami HIRAMATSU
Linux Technology Research Center, System Productivity Research Dept.
Center for Technology Innovation - Systems Engineering
Hitachi, Ltd., Research & Development Group
E-mail: masami.hiramatsu.pt@...achi.com
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