From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753710Ab2ITQTx (ORCPT ); Thu, 20 Sep 2012 12:19:53 -0400 Received: from mail-wi0-f172.google.com ([209.85.212.172]:36099 "EHLO mail-wi0-f172.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750787Ab2ITQTw (ORCPT ); Thu, 20 Sep 2012 12:19:52 -0400 Date: Thu, 20 Sep 2012 18:19:45 +0200 From: Stephane Eranian To: linux-kernel@vger.kernel.org Cc: acme@redhat.com, peterz@infradead.org, mingo@elte.hu, dsahern@gmail.com Subject: [PATCH] perf record: print event causing perf_event_open() to fail Message-ID: <20120920161945.GA7064@quad> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Got tired of not getting the event that caused the perf_event_open() syscall to fail. So I fixed the error message. This is very useful when monitoring lots of events in a single run. Signed-off-by: Stephane Eranian --- diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c index c643ed6..2cb7434 100644 --- a/tools/perf/builtin-record.c +++ b/tools/perf/builtin-record.c @@ -297,8 +297,10 @@ static int perf_record__open(struct perf_record *rec) } printf("\n"); - error("sys_perf_event_open() syscall returned with %d (%s). /bin/dmesg may provide additional information.\n", - err, strerror(err)); + error("sys_perf_event_open() syscall returned with %d " + "(%s) for event %s. /bin/dmesg may provide " + "additional information.\n", + err, strerror(err), perf_evsel__name(pos)); #if defined(__i386__) || defined(__x86_64__) if (attr->type == PERF_TYPE_HARDWARE &&