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>
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@ -178,6 +178,9 @@ Print count deltas for fixed number of times.
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This option should be used together with "-I" option.
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example: 'perf stat -I 1000 --interval-count 2 -e cycles -a'
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--interval-clear::
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Clear the screen before next interval.
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--timeout msecs::
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Stop the 'perf stat' session and print count deltas after N milliseconds (minimum: 10 ms).
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This option is not supported with the "-I" option.
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@ -65,6 +65,7 @@
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#include "util/tool.h"
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#include "util/string2.h"
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#include "util/metricgroup.h"
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#include "util/top.h"
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#include "asm/bug.h"
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#include <linux/time64.h>
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@ -173,6 +174,7 @@ static struct cpu_map *aggr_map;
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static aggr_get_id_t aggr_get_id;
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static bool append_file;
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static bool interval_count;
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static bool interval_clear;
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static const char *output_name;
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static int output_fd;
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static int print_free_counters_hint;
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@ -1704,9 +1706,12 @@ static void print_interval(char *prefix, struct timespec *ts)
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FILE *output = stat_config.output;
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static int num_print_interval;
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if (interval_clear)
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puts(CONSOLE_CLEAR);
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sprintf(prefix, "%6lu.%09lu%s", ts->tv_sec, ts->tv_nsec, csv_sep);
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if (num_print_interval == 0 && !csv_output) {
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if ((num_print_interval == 0 && !csv_output) || interval_clear) {
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switch (stat_config.aggr_mode) {
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case AGGR_SOCKET:
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fprintf(output, "# time socket cpus");
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@ -1738,7 +1743,7 @@ static void print_interval(char *prefix, struct timespec *ts)
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}
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}
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if (num_print_interval == 0 && metric_only)
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if ((num_print_interval == 0 && metric_only) || interval_clear)
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print_metric_headers(" ", true);
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if (++num_print_interval == 25)
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num_print_interval = 0;
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@ -2057,6 +2062,8 @@ static const struct option stat_options[] = {
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"(overhead is possible for values <= 100ms)"),
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OPT_INTEGER(0, "interval-count", &stat_config.times,
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"print counts for fixed number of times"),
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OPT_BOOLEAN(0, "interval-clear", &interval_clear,
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"clear screen in between new interval"),
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OPT_UINTEGER(0, "timeout", &stat_config.timeout,
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"stop workload and print counts after a timeout period in ms (>= 10ms)"),
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OPT_SET_UINT(0, "per-socket", &stat_config.aggr_mode,
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