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perf stat: Clear screen only if output file is a tty

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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@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: James Clark <james.clark@arm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Xing Zhengjun <zhengjun.xing@linux.intel.com>
Link: https://lore.kernel.org/r/20221107213314.3239159-4-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Namhyung Kim
2022-11-07 13:33:08 -08:00
committed by Arnaldo Carvalho de Melo
parent 4ea0be1f0d
commit 81a02c6577
1 changed files with 1 additions and 1 deletions
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2
tools/perf/util/stat-display.c
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@@ -890,7 +890,7 @@ 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)