Messages in this thread | | | Date | Mon, 23 Jun 2014 11:21:08 +0900 | From | Masami Hiramatsu <> | Subject | Re: [PATCH -tip 1/4] perf/probe: Improve error message for unknown member of data structure |
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(2014/06/22 3:18), Patrick Palka wrote: > On Fri, Jun 6, 2014 at 3:13 AM, Masami Hiramatsu > <masami.hiramatsu.pt@hitachi.com> wrote: >> Improve the error message if we can not find given member in >> the given structure. Currently perf probe shows a wrong error >> message as below. >> >> ----- >> # perf probe getname_flags:65 "result->BOGUS" >> result(type:filename) has no member BOGUS. >> Failed to find 'result' in this function. >> Error: Failed to add events. (-22) >> ----- >> >> The first message is correct, but the second one is not, since >> we didn't fail to find a variable but fails to find the member >> of given variable. >> >> ----- >> # perf probe getname_flags:65 "result->BOGUS" >> result(type:filename) has no member BOGUS. >> Error: Failed to add events. (-22) >> ----- >> >> With this patch, the error message shows only the first one. >> And if we really failed to find given variable, it tells us so. >> >> ----- >> # perf probe getname_flags:65 "BOGUS" >> Failed to find 'BOGUS' in this function. >> Error: Failed to add events. (-2) >> ----- >> >> Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> >> Reported-by: Arnaldo Carvalho de Melo <acme@kernel.org> >> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> >> Cc: Paul Mackerras <paulus@samba.org> >> Cc: Ingo Molnar <mingo@redhat.com> >> Cc: Namhyung Kim <namhyung@kernel.org> >> Cc: Jiri Olsa <jolsa@redhat.com> >> --- >> tools/perf/util/probe-finder.c | 5 ++--- >> 1 file changed, 2 insertions(+), 3 deletions(-) >> >> diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c >> index 9d8eb26..ce8faf4 100644 >> --- a/tools/perf/util/probe-finder.c >> +++ b/tools/perf/util/probe-finder.c >> @@ -573,14 +573,13 @@ static int find_variable(Dwarf_Die *sc_die, struct probe_finder *pf) >> if (!die_find_variable_at(sc_die, pf->pvar->var, pf->addr, &vr_die)) { >> /* Search again in global variables */ >> if (!die_find_variable_at(&pf->cu_die, pf->pvar->var, 0, &vr_die)) >> + pr_warning("Failed to find '%s' in this function.\n", >> + pf->pvar->var); >> ret = -ENOENT; > > It looks like you're missing a pair of braces here.
Oops, right! Thank you very much!
-- Masami HIRAMATSU Software Platform Research Dept. Linux Technology Research Center Hitachi, Ltd., Yokohama Research Laboratory E-mail: masami.hiramatsu.pt@hitachi.com
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