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Subject[PATCH][v6] tools/power turbostat: if --iterations, print for specific count of iterations
Date
There's a use case during test to only print specific round of iterations
if --iterations is specified, for example, with this patch applied:

turbostat -i 5 -r 4
will capture 4 samples with 5 seconds interval.

Cc: Len Brown <lenb@kernel.org>
Cc: Rafael J. Wysocki <rjw@rjwysocki.net>
Cc: Artem Bityutskiy <artem.bityutskiy@intel.com>
Cc: Doug Smythies <dsmythies@telus.net>
Cc: linux-pm@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Chen Yu <yu.c.chen@intel.com>
---
tools/power/x86/turbostat/turbostat.8 | 2 ++
tools/power/x86/turbostat/turbostat.c | 23 ++++++++++++++++++++++-
2 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/tools/power/x86/turbostat/turbostat.8 b/tools/power/x86/turbostat/turbostat.8
index ccf2a69..7452dc4 100644
--- a/tools/power/x86/turbostat/turbostat.8
+++ b/tools/power/x86/turbostat/turbostat.8
@@ -64,6 +64,8 @@ name as necessary to disambiguate it from others is necessary. Note that option
.PP
\fB--interval seconds\fP overrides the default 5.0 second measurement interval.
.PP
+\fB--iterations count\fP number of the measurement iterations.
+.PP
\fB--out output_file\fP turbostat output is written to the specified output_file.
The file is truncated if it already exists, and it is created if it does not exist.
.PP
diff --git a/tools/power/x86/turbostat/turbostat.c b/tools/power/x86/turbostat/turbostat.c
index bd9c6b3..0220892 100644
--- a/tools/power/x86/turbostat/turbostat.c
+++ b/tools/power/x86/turbostat/turbostat.c
@@ -48,6 +48,7 @@ char *proc_stat = "/proc/stat";
FILE *outf;
int *fd_percpu;
struct timespec interval_ts = {5, 0};
+int iterations;
unsigned int debug;
unsigned int quiet;
unsigned int sums_need_wide_columns;
@@ -470,6 +471,7 @@ void help(void)
" {core | package | j,k,l..m,n-p }\n"
"--quiet skip decoding system configuration header\n"
"--interval sec Override default 5-second measurement interval\n"
+ "--iterations count number of the measurement iterations\n"
"--help print this help message\n"
"--list list column headers only\n"
"--out file create or truncate \"file\" for all output\n"
@@ -2565,6 +2567,7 @@ void turbostat_loop()
{
int retval;
int restarted = 0;
+ int done_iters = 0;

restart:
restarted++;
@@ -2581,6 +2584,7 @@ void turbostat_loop()
goto restart;
}
restarted = 0;
+ done_iters = 0;
gettimeofday(&tv_even, (struct timezone *)NULL);

while (1) {
@@ -2607,6 +2611,10 @@ void turbostat_loop()
compute_average(EVEN_COUNTERS);
format_all_counters(EVEN_COUNTERS);
flush_output_stdout();
+
+ if (iterations && ++done_iters >= iterations)
+ break;
+
nanosleep(&interval_ts, NULL);
if (snapshot_proc_sysfs_files())
goto restart;
@@ -2626,6 +2634,9 @@ void turbostat_loop()
compute_average(ODD_COUNTERS);
format_all_counters(ODD_COUNTERS);
flush_output_stdout();
+
+ if (iterations && ++done_iters >= iterations)
+ break;
}
}

@@ -4999,6 +5010,7 @@ void cmdline(int argc, char **argv)
{"Dump", no_argument, 0, 'D'},
{"debug", no_argument, 0, 'd'}, /* internal, not documented */
{"interval", required_argument, 0, 'i'},
+ {"iterations", required_argument, 0, 'r'},
{"help", no_argument, 0, 'h'},
{"hide", required_argument, 0, 'H'}, // meh, -h taken by --help
{"Joules", no_argument, 0, 'J'},
@@ -5014,7 +5026,7 @@ void cmdline(int argc, char **argv)

progname = argv[0];

- while ((opt = getopt_long_only(argc, argv, "+C:c:Ddhi:JM:m:o:qST:v",
+ while ((opt = getopt_long_only(argc, argv, "+C:c:Ddhi:JM:m:o:qr:ST:v",
long_options, &option_index)) != -1) {
switch (opt) {
case 'a':
@@ -5063,6 +5075,15 @@ void cmdline(int argc, char **argv)
case 'q':
quiet = 1;
break;
+ case 'r':
+ iterations = strtod(optarg, NULL);
+
+ if (iterations <= 0) {
+ fprintf(outf, "iterations %d should be positive number\n",
+ iterations);
+ exit(2);
+ }
+ break;
case 's':
parse_show_hide(optarg, SHOW_LIST);
break;
--
2.7.4
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