[PATCH][RFC] tools/power turbostat: if --max_loop, print for specific time of loops

From: Yu Chen
Date: Tue Apr 10 2018 - 06:15:35 EST


From: Chen Yu <yu.c.chen@xxxxxxxxx>

There's a use case during test to only print specific round of loops
if --interval is specified, for example, with this patch applied:

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

Signed-off-by: Chen Yu <yu.c.chen@xxxxxxxxx>
---
tools/power/x86/turbostat/turbostat.c | 19 ++++++++++++++++++-
1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/tools/power/x86/turbostat/turbostat.c b/tools/power/x86/turbostat/turbostat.c
index bd9c6b31a504..a35418a59468 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};
+unsigned int max_loops;
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"
+ "--max_loops times The number of loops if interval is specified\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 loops = 0;

restart:
restarted++;
@@ -2583,6 +2586,7 @@ void turbostat_loop()
restarted = 0;
gettimeofday(&tv_even, (struct timezone *)NULL);

+ loops = 0;
while (1) {
if (for_all_proc_cpus(cpu_is_not_present)) {
re_initialize();
@@ -2626,6 +2630,9 @@ void turbostat_loop()
compute_average(ODD_COUNTERS);
format_all_counters(ODD_COUNTERS);
flush_output_stdout();
+
+ if (++loops >= (max_loops/2))
+ break;
}
}

@@ -5009,12 +5016,13 @@ void cmdline(int argc, char **argv)
{"Summary", no_argument, 0, 'S'},
{"TCC", required_argument, 0, 'T'},
{"version", no_argument, 0, 'v' },
+ {"max_loops", required_argument, 0, 'x'},
{0, 0, 0, 0 }
};

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:qST:vx:",
long_options, &option_index)) != -1) {
switch (opt) {
case 'a':
@@ -5076,6 +5084,15 @@ void cmdline(int argc, char **argv)
print_version();
exit(0);
break;
+ case 'x':
+ {
+ unsigned int loops = strtod(optarg, NULL);
+
+ if (loops % 2)
+ loops++;
+ max_loops = loops;
+ }
+ break;
}
}
}
--
2.13.6