From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934377AbaGYO5Z (ORCPT ); Fri, 25 Jul 2014 10:57:25 -0400 Received: from mx1.redhat.com ([209.132.183.28]:25445 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934299AbaGYO5T (ORCPT ); Fri, 25 Jul 2014 10:57:19 -0400 From: Jiri Olsa To: linux-kernel@vger.kernel.org Cc: Jiri Olsa , Arnaldo Carvalho de Melo , Corey Ashford , David Ahern , Frederic Weisbecker , Ingo Molnar , Jean Pihet , Namhyung Kim , Paul Mackerras , Peter Zijlstra Subject: [PATCH 18/19] perf tools: Store PERF_RECORD_FINISHED_ROUND only for nonempty rounds Date: Fri, 25 Jul 2014 16:56:16 +0200 Message-Id: <1406300177-31805-19-git-send-email-jolsa@kernel.org> In-Reply-To: <1406300177-31805-1-git-send-email-jolsa@kernel.org> References: <1406300177-31805-1-git-send-email-jolsa@kernel.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Currently we store PERF_RECORD_FINISHED_ROUND event each time we go throught mmap buffers no matter if it contains any data, which is useless. Forcing the PERF_RECORD_FINISHED_ROUND event to be stored any time we finished the round AND wrote at least one event. Cc: Arnaldo Carvalho de Melo Cc: Corey Ashford Cc: David Ahern Cc: Frederic Weisbecker Cc: Ingo Molnar Cc: Jean Pihet Cc: Namhyung Kim Cc: Paul Mackerras Cc: Peter Zijlstra Signed-off-by: Jiri Olsa --- tools/perf/builtin-record.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c index 4a1a54265b04..4869050e7194 100644 --- a/tools/perf/builtin-record.c +++ b/tools/perf/builtin-record.c @@ -238,6 +238,7 @@ static struct perf_event_header finished_round_event = { static int record__mmap_read_all(struct record *rec) { + u64 bytes_written = rec->bytes_written; int i; int rc = 0; @@ -250,7 +251,12 @@ static int record__mmap_read_all(struct record *rec) } } - rc = record__write(rec, &finished_round_event, sizeof(finished_round_event)); + /* + * Mark the round finished in case we wrote + * at least one event. + */ + if (bytes_written != rec->bytes_written) + rc = record__write(rec, &finished_round_event, sizeof(finished_round_event)); out: return rc; -- 1.8.3.1