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

[Yu Chen]

From: Chen Yu <yu.c.c...@intel.com>

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.c...@intel.com>
---
 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