perf stat: Add --interval-clear option
Adding --interval-clear option to clear the screen before next interval.
Committer testing:
# perf stat -I 1000 --interval-clear
And, as expected, it behaves almost like:
# watch -n 0 perf stat -a sleep 1
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <frederic@kernel.org>
Cc: Milian Wolff <milian.wolff@kdab.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/20180606221513.11302-4-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 096ccb2..f1532e3 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -65,6 +65,7 @@
#include "util/tool.h"
#include "util/string2.h"
#include "util/metricgroup.h"
+#include "util/top.h"
#include "asm/bug.h"
#include <linux/time64.h>
@@ -173,6 +174,7 @@ static struct cpu_map *aggr_map;
static aggr_get_id_t aggr_get_id;
static bool append_file;
static bool interval_count;
+static bool interval_clear;
static const char *output_name;
static int output_fd;
static int print_free_counters_hint;
@@ -1704,9 +1706,12 @@ static void print_interval(char *prefix, struct timespec *ts)
FILE *output = stat_config.output;
static int num_print_interval;
+ if (interval_clear)
+ puts(CONSOLE_CLEAR);
+
sprintf(prefix, "%6lu.%09lu%s", ts->tv_sec, ts->tv_nsec, csv_sep);
- if (num_print_interval == 0 && !csv_output) {
+ if ((num_print_interval == 0 && !csv_output) || interval_clear) {
switch (stat_config.aggr_mode) {
case AGGR_SOCKET:
fprintf(output, "# time socket cpus");
@@ -1738,7 +1743,7 @@ static void print_interval(char *prefix, struct timespec *ts)
}
}
- if (num_print_interval == 0 && metric_only)
+ if ((num_print_interval == 0 && metric_only) || interval_clear)
print_metric_headers(" ", true);
if (++num_print_interval == 25)
num_print_interval = 0;
@@ -2057,6 +2062,8 @@ static const struct option stat_options[] = {
"(overhead is possible for values <= 100ms)"),
OPT_INTEGER(0, "interval-count", &stat_config.times,
"print counts for fixed number of times"),
+ OPT_BOOLEAN(0, "interval-clear", &interval_clear,
+ "clear screen in between new interval"),
OPT_UINTEGER(0, "timeout", &stat_config.timeout,
"stop workload and print counts after a timeout period in ms (>= 10ms)"),
OPT_SET_UINT(0, "per-socket", &stat_config.aggr_mode,