linux-kernel - [tip:perf/core] perf stat: Flush output after each line in interval mode

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Date:	Mon, 12 Aug 2013 03:20:18 -0700
From:	tip-bot for Andi Kleen <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	acme@...hat.com, linux-kernel@...r.kernel.org, eranian@...gle.com,
	hpa@...or.com, mingo@...nel.org, jolsa@...hat.com,
	ak@...ux.intel.com, tglx@...utronix.de
Subject: [tip:perf/core] perf stat:
  Flush output after each line in interval mode

Commit-ID:  2bbf03f16a634f675c49c473b2b6528571990aea
Gitweb:     http://git.kernel.org/tip/2bbf03f16a634f675c49c473b2b6528571990aea
Author:     Andi Kleen <ak@...ux.intel.com>
AuthorDate: Fri, 2 Aug 2013 17:41:12 -0700
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Wed, 7 Aug 2013 17:35:29 -0300

perf stat: Flush output after each line in interval mode

When interval mode is outputting to a pipe, each measurement should be
flushed individually, so that the reader sees it timely.

With a terminal each line is automatically flushed by stdio, but that is
disabled with non terminal output.

Simply fflush output after each time interval

Signed-off-by: Andi Kleen <ak@...ux.intel.com>
Reviewed-by: Jiri Olsa <jolsa@...hat.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Stephane Eranian <eranian@...gle.com>
Link: http://lkml.kernel.org/r/1375490473-1503-5-git-send-email-andi@firstfloor.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/builtin-stat.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 2e637e4..f686d5f 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -416,6 +416,8 @@ static void print_interval(void)
 		list_for_each_entry(counter, &evsel_list->entries, node)
 			print_counter_aggr(counter, prefix);
 	}
+
+	fflush(output);
 }
 
 static void handle_initial_delay(void)
--
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