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

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Date:   Mon,  7 Nov 2022 13:33:08 -0800
From:   Namhyung Kim <namhyung@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        linux-perf-users@...r.kernel.org,
        Kan Liang <kan.liang@...ux.intel.com>,
        Zhengjun Xing <zhengjun.xing@...ux.intel.com>,
        James Clark <james.clark@....com>
Subject: [PATCH 3/9] perf stat: Clear screen only if output file is a tty

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@...nel.org>
---
 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