tools/tools/mwait_mon/mwait_mon.c

   1 #include <sys/types.h>
   2 #include <sys/sysctl.h>
   3
   4 #include <stdio.h>
   5 #include <stdint.h>
   6 #include <unistd.h>
   7
   8 #define MWAIT_CX_MAX    8
   9
  10 struct cx_stat {
  11         char            sysctl_name[52];
  12         char            state_name[4];
  13 };
  14
  15 static void     getstats(uint64_t[]);
  16
  17 static struct cx_stat   cx_stats[MWAIT_CX_MAX];
  18 static int              cx_stats_cnt;
  19
  20 int
  21 main(void)
  22 {
  23         uint64_t count[MWAIT_CX_MAX], prev_count[MWAIT_CX_MAX];
  24         int i;
  25
  26         for (i = 0; i < MWAIT_CX_MAX; ++i) {
  27                 char name[64];
  28                 size_t len;
  29                 int subcnt;
  30
  31                 snprintf(name, sizeof(name), "machdep.mwait.C%d.subcnt", i);
  32
  33                 len = sizeof(subcnt);
  34                 sysctlbyname(name, &subcnt, &len, NULL, 0);
  35                 if (subcnt == 0)
  36                         continue;
  37
  38                 snprintf(cx_stats[cx_stats_cnt].state_name,
  39                     sizeof(cx_stats[cx_stats_cnt].state_name), "C%d", i);
  40                 snprintf(cx_stats[cx_stats_cnt].sysctl_name,
  41                     sizeof(cx_stats[cx_stats_cnt].sysctl_name),
  42                     "machdep.mwait.C%d.entered", i);
  43                 ++cx_stats_cnt;
  44         }
  45
  46         getstats(prev_count);
  47
  48         for (;;) {
  49                 getstats(count);
  50
  51                 for (i = 0; i < cx_stats_cnt; ++i) {
  52                         printf("%s %-5ju ", cx_stats[i].state_name,
  53                             (uintmax_t)(count[i] - prev_count[i]));
  54                         prev_count[i] = count[i];
  55                 }
  56                 printf("\n");
  57                 fflush(stdout);
  58
  59                 sleep(1);
  60         }
  61 }
  62
  63 static void
  64 getstats(uint64_t count[])
  65 {
  66         int i;
  67
  68         for (i = 0; i < cx_stats_cnt; ++i) {
  69                 size_t len;
  70
  71                 len = sizeof(uint64_t);
  72                 sysctlbyname(cx_stats[i].sysctl_name, &count[i], &len, NULL, 0);
  73         }
  74 }