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

From: tip-bot for Andi Kleen
Date: Mon Aug 12 2013 - 06:20:45 EST

Commit-ID: 2bbf03f16a634f675c49c473b2b6528571990aea
Gitweb: http://git.kernel.org/tip/2bbf03f16a634f675c49c473b2b6528571990aea
Author: Andi Kleen <ak@xxxxxxxxxxxxxxx>
AuthorDate: Fri, 2 Aug 2013 17:41:12 -0700
Committer: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
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@xxxxxxxxxxxxxxx>
Reviewed-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Stephane Eranian <eranian@xxxxxxxxxx>
Link: http://lkml.kernel.org/r/1375490473-1503-5-git-send-email-andi@xxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
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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