From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1949311AbcBSWlp (ORCPT ); Fri, 19 Feb 2016 17:41:45 -0500 Received: from bombadil.infradead.org ([198.137.202.9]:35462 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1946841AbcBSWln (ORCPT ); Fri, 19 Feb 2016 17:41:43 -0500 From: Arnaldo Carvalho de Melo To: Ingo Molnar Cc: linux-kernel@vger.kernel.org, Arnaldo Carvalho de Melo , Adrian Hunter , Jiri Olsa , Namhyung Kim , Steven Noonan , Wang Nan Subject: [PATCH 04/22] perf tests: Use perf_evlist__strerror_open() to provide hints about max_freq Date: Fri, 19 Feb 2016 19:41:18 -0300 Message-Id: <1455921696-3895-5-git-send-email-acme@kernel.org> X-Mailer: git-send-email 2.5.0 In-Reply-To: <1455921696-3895-1-git-send-email-acme@kernel.org> References: <1455921696-3895-1-git-send-email-acme@kernel.org> X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Arnaldo Carvalho de Melo Before: # perf test -v "code reading" 2>&1 | tail -4 perf_evlist__open failed test child finished with -1 ---- end ---- Test object code reading: FAILED! # After: # perf test -v "code reading" 2>&1 | tail -7 perf_evlist__open() failed! Error: Invalid argument. Hint: Check /proc/sys/kernel/perf_event_max_sample_rate. Hint: The current value is 1000 and 4000 is being requested. test child finished with -1 ---- end ---- Test object code reading: FAILED! # Cc: Adrian Hunter Cc: Jiri Olsa Cc: Namhyung Kim Cc: Steven Noonan Cc: Wang Nan Link: http://lkml.kernel.org/n/tip-ifbx7vmrc38loe6317owz2jx@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/tests/code-reading.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/tools/perf/tests/code-reading.c b/tools/perf/tests/code-reading.c index 313a48c6b2bc..f84339cb7f95 100644 --- a/tools/perf/tests/code-reading.c +++ b/tools/perf/tests/code-reading.c @@ -559,7 +559,13 @@ static int do_test_code_reading(bool try_kcore) evlist = NULL; continue; } - pr_debug("perf_evlist__open failed\n"); + + if (verbose) { + char errbuf[512]; + perf_evlist__strerror_open(evlist, errno, errbuf, sizeof(errbuf)); + pr_debug("perf_evlist__open() failed!\n%s\n", errbuf); + } + goto out_put; } break; -- 2.5.0