From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752444Ab3LBAH0 (ORCPT ); Sun, 1 Dec 2013 19:07:26 -0500 Received: from mail-pb0-f48.google.com ([209.85.160.48]:33499 "EHLO mail-pb0-f48.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751412Ab3LBAHQ (ORCPT ); Sun, 1 Dec 2013 19:07:16 -0500 From: David Ahern To: acme@ghostprotocols.net, linux-kernel@vger.kernel.org Cc: David Ahern , Masami Hiramatsu , Srikar Dronamraju Subject: [PATCH 1/2] perf probe: Improve error message when function not found Date: Sun, 1 Dec 2013 17:07:06 -0700 Message-Id: <1385942827-11637-1-git-send-email-dsahern@gmail.com> X-Mailer: git-send-email 1.8.3.4 (Apple Git-47) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org When requesting a function from a userspace library the error message to the user is less than helpful. e.g., perf probe -x /lib64/libpthread-2.14.90.so -a 'lock_full=__pthread_mutex_lock_full' no symbols found in /lib64/libpthread-2.14.90.so, maybe install a debug package? Failed to load map. Error: Failed to add events. (-22) In this cae the symbol really does exist but is a local symbol which is filtered: nm /lib64/libpthread-2.14.90.so | grep __pthread_mutex_lock_full 0000000000005700 t __pthread_mutex_lock_full With this patch: perf probe -x /lib64/libpthread-2.14.90.so -a 'lock_full=__pthread_mutex_lock_full' no symbols found in /lib64/libpthread-2.14.90.so, maybe install a debug package? Failed to find function in /lib64/libpthread-2.14.90.so. Perhaps it is a local variable? Error: Failed to add events. (-22) Signed-off-by: David Ahern Cc: Masami Hiramatsu Cc: Srikar Dronamraju --- tools/perf/util/probe-event.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c index 9c6989ca2bea..638071b7bdd2 100644 --- a/tools/perf/util/probe-event.c +++ b/tools/perf/util/probe-event.c @@ -2309,7 +2309,8 @@ static int convert_name_to_addr(struct perf_probe_event *pev, const char *exec) } available_func_filter = strfilter__new(function, NULL); if (map__load(map, filter_available_functions)) { - pr_err("Failed to load map.\n"); + pr_err("Failed to find requested function in %s. Perhaps it is a local variable?\n", + name); goto out; } -- 1.8.3.4 (Apple Git-47)