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SubjectRe: [PATCH v4 3/3] perf probe: Show better error message when failed to find variable
Em Mon, May 11, 2015 at 01:10:04PM +0000, He Kuang escreveu:
> Indicate to check variable location range in error message when we got
> failed to find the variable, and put user-supplied variable name in
> quotes.
>
> 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 the 'bytes' variable at this address.
> Perhaps, it has been optimized out.
> Use -V with --range option to show variable location range.
> Error: Failed to add events.

See my other reply.

- Arnaldo

> Signed-off-by: He Kuang <hekuang@huawei.com>
> ---
> tools/perf/util/probe-finder.c | 6 ++++--
> 1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
> index f032329..0fc2ae8 100644
> --- a/tools/perf/util/probe-finder.c
> +++ b/tools/perf/util/probe-finder.c
> @@ -528,8 +528,10 @@ static int convert_variable(Dwarf_Die *vr_die, struct probe_finder *pf)
> ret = convert_variable_location(vr_die, pf->addr, pf->fb_ops,
> &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);
> + pr_err("Failed to find the location of the '%s' variable at this address.\n"
> + " 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) {
> --
> 1.8.5.2


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