From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752997Ab3KANwC (ORCPT ); Fri, 1 Nov 2013 09:52:02 -0400 Received: from mga02.intel.com ([134.134.136.20]:23727 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752592Ab3KANv7 (ORCPT ); Fri, 1 Nov 2013 09:51:59 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.93,535,1378882800"; d="scan'208";a="402156911" From: Adrian Hunter To: Arnaldo Carvalho de Melo Cc: Peter Zijlstra , Ingo Molnar , linux-kernel@vger.kernel.org, David Ahern , Frederic Weisbecker , Jiri Olsa , Mike Galbraith , Namhyung Kim , Paul Mackerras , Stephane Eranian Subject: [PATCH V3 01/11] perf evsel: Add a debug print if perf_event_open fails Date: Fri, 1 Nov 2013 15:51:29 +0200 Message-Id: <1383313899-15987-2-git-send-email-adrian.hunter@intel.com> X-Mailer: git-send-email 1.7.11.7 In-Reply-To: <1383313899-15987-1-git-send-email-adrian.hunter@intel.com> References: <1383313899-15987-1-git-send-email-adrian.hunter@intel.com> Organization: Intel Finland Oy, Registered Address: PL 281, 00181 Helsinki, Business Identity Code: 0357606 - 4, Domiciled in Helsinki Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org There is a debug print (at verbose level 2) for each call to perf_event_open. Add another debug print if the call fails, and print the error number. Signed-off-by: Adrian Hunter --- tools/perf/util/evsel.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c index ec0cc1e..e09c7e6 100644 --- a/tools/perf/util/evsel.c +++ b/tools/perf/util/evsel.c @@ -1052,6 +1052,8 @@ retry_open: group_fd, flags); if (FD(evsel, cpu, thread) < 0) { err = -errno; + pr_debug2("perf_event_open failed, error %d\n", + err); goto try_fallback; } set_rlimit = NO_CHANGE; -- 1.7.11.7