[PATCH 3/9] perf stat: Clear screen only if output file is a tty

[Namhyung Kim]

The --interval-clear option makes perf stat to clear the terminal at
each interval.  But it doesn't need to clear the screen when it saves
to a file.

Signed-off-by: Namhyung Kim <namhyung@xxxxxxxxxx>
---
 tools/perf/util/stat-display.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/stat-display.c b/tools/perf/util/stat-display.c
index 17d656566cd9..d4936a502560 100644
--- a/tools/perf/util/stat-display.c
+++ b/tools/perf/util/stat-display.c
@@ -892,7 +892,7 @@ static void print_interval(struct perf_stat_config *config,
 	FILE *output = config->output;
 	static int num_print_interval;
 
-	if (config->interval_clear)
+	if (config->interval_clear && isatty(fileno(output)))
 		puts(CONSOLE_CLEAR);
 
 	if (!config->iostat_run && !config->json_output)
-- 
2.38.1.431.g37b22c650d-goog