src/splat/splat-time.c

   1 #include <sys/zfs_context.h>
   2 #include <sys/splat-ctl.h>
   3
   4 #define KZT_SUBSYSTEM_TIME              0x0800
   5 #define KZT_TIME_NAME                   "time"
   6 #define KZT_TIME_DESC                   "Kernel Time Tests"
   7
   8 #define KZT_TIME_TEST1_ID               0x0801
   9 #define KZT_TIME_TEST1_NAME             "time1"
  10 #define KZT_TIME_TEST1_DESC             "HZ Test"
  11
  12 #define KZT_TIME_TEST2_ID               0x0802
  13 #define KZT_TIME_TEST2_NAME             "time2"
  14 #define KZT_TIME_TEST2_DESC             "Monotonic Test"
  15
  16 static int
  17 kzt_time_test1(struct file *file, void *arg)
  18 {
  19         int myhz = hz;
  20         kzt_vprint(file, KZT_TIME_TEST1_NAME, "hz is %d\n", myhz);
  21         return 0;
  22 }
  23
  24 static int
  25 kzt_time_test2(struct file *file, void *arg)
  26 {
  27         hrtime_t tm1, tm2;
  28         int i;
  29
  30         tm1 = gethrtime();
  31         kzt_vprint(file, KZT_TIME_TEST2_NAME, "time is %lld\n", tm1);
  32
  33         for(i = 0; i < 100; i++) {
  34                 tm2 = gethrtime();
  35                 kzt_vprint(file, KZT_TIME_TEST2_NAME, "time is %lld\n", tm2);
  36
  37                 if(tm1 > tm2) {
  38                         kzt_print(file, "%s: gethrtime() is not giving monotonically increasing values\n", KZT_TIME_TEST2_NAME);
  39                         return 1;
  40                 }
  41                 tm1 = tm2;
  42
  43                 set_current_state(TASK_INTERRUPTIBLE);
  44                 schedule_timeout(10);
  45         }
  46
  47         return 0;
  48 }
  49
  50 kzt_subsystem_t *
  51 kzt_time_init(void)
  52 {
  53         kzt_subsystem_t *sub;
  54
  55         sub = kmalloc(sizeof(*sub), GFP_KERNEL);
  56         if (sub == NULL)
  57                 return NULL;
  58
  59         memset(sub, 0, sizeof(*sub));
  60         strncpy(sub->desc.name, KZT_TIME_NAME, KZT_NAME_SIZE);
  61         strncpy(sub->desc.desc, KZT_TIME_DESC, KZT_DESC_SIZE);
  62         INIT_LIST_HEAD(&sub->subsystem_list);
  63         INIT_LIST_HEAD(&sub->test_list);
  64         spin_lock_init(&sub->test_lock);
  65         sub->desc.id = KZT_SUBSYSTEM_TIME;
  66
  67         KZT_TEST_INIT(sub, KZT_TIME_TEST1_NAME, KZT_TIME_TEST1_DESC,
  68                       KZT_TIME_TEST1_ID, kzt_time_test1);
  69         KZT_TEST_INIT(sub, KZT_TIME_TEST2_NAME, KZT_TIME_TEST2_DESC,
  70                       KZT_TIME_TEST2_ID, kzt_time_test2);
  71
  72         return sub;
  73 }
  74
  75 void
  76 kzt_time_fini(kzt_subsystem_t *sub)
  77 {
  78         ASSERT(sub);
  79
  80         KZT_TEST_FINI(sub, KZT_TIME_TEST2_ID);
  81         KZT_TEST_FINI(sub, KZT_TIME_TEST1_ID);
  82
  83         kfree(sub);
  84 }
  85
  86 int
  87 kzt_time_id(void)
  88 {
  89         return KZT_SUBSYSTEM_TIME;
  90 }