mirror_zfs/modules/splat/splat-time.c

#include "splat-internal.h"

#define SPLAT_SUBSYSTEM_TIME		0x0800
#define SPLAT_TIME_NAME			"time"
#define SPLAT_TIME_DESC			"Kernel Time Tests"

#define SPLAT_TIME_TEST1_ID		0x0801
#define SPLAT_TIME_TEST1_NAME		"time1"
#define SPLAT_TIME_TEST1_DESC		"HZ Test"

#define SPLAT_TIME_TEST2_ID		0x0802
#define SPLAT_TIME_TEST2_NAME		"time2"
#define SPLAT_TIME_TEST2_DESC		"Monotonic Test"

static int
splat_time_test1(struct file *file, void *arg)
{
	int myhz = hz;
	splat_vprint(file, SPLAT_TIME_TEST1_NAME, "hz is %d\n", myhz);
        return 0;
}

static int
splat_time_test2(struct file *file, void *arg)
{
        hrtime_t tm1, tm2;
	int i;

        tm1 = gethrtime();
        splat_vprint(file, SPLAT_TIME_TEST2_NAME, "time is %lld\n", tm1);

        for(i = 0; i < 100; i++) {
                tm2 = gethrtime();
                splat_vprint(file, SPLAT_TIME_TEST2_NAME, "time is %lld\n", tm2);

                if(tm1 > tm2) {
                        splat_print(file, "%s: gethrtime() is not giving "
				    "monotonically increasing values\n",
				    SPLAT_TIME_TEST2_NAME);
                        return 1;
                }
                tm1 = tm2;

                set_current_state(TASK_INTERRUPTIBLE);
                schedule_timeout(10);
        }

        return 0;
}

splat_subsystem_t *
splat_time_init(void)
{
        splat_subsystem_t *sub;

        sub = kmalloc(sizeof(*sub), GFP_KERNEL);
        if (sub == NULL)
                return NULL;

        memset(sub, 0, sizeof(*sub));
        strncpy(sub->desc.name, SPLAT_TIME_NAME, SPLAT_NAME_SIZE);
	strncpy(sub->desc.desc, SPLAT_TIME_DESC, SPLAT_DESC_SIZE);
        INIT_LIST_HEAD(&sub->subsystem_list);
	INIT_LIST_HEAD(&sub->test_list);
        spin_lock_init(&sub->test_lock);
        sub->desc.id = SPLAT_SUBSYSTEM_TIME;

        SPLAT_TEST_INIT(sub, SPLAT_TIME_TEST1_NAME, SPLAT_TIME_TEST1_DESC,
	              SPLAT_TIME_TEST1_ID, splat_time_test1);
        SPLAT_TEST_INIT(sub, SPLAT_TIME_TEST2_NAME, SPLAT_TIME_TEST2_DESC,
	              SPLAT_TIME_TEST2_ID, splat_time_test2);

        return sub;
}

void
splat_time_fini(splat_subsystem_t *sub)
{
        ASSERT(sub);

        SPLAT_TEST_FINI(sub, SPLAT_TIME_TEST2_ID);
        SPLAT_TEST_FINI(sub, SPLAT_TIME_TEST1_ID);

        kfree(sub);
}

int
splat_time_id(void)
{
        return SPLAT_SUBSYSTEM_TIME;
}