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#include "libcflat.h"
#include "smp.h"
#include "atomic.h"
#include "processor.h"
#include "kvmclock.h"
#define DEFAULT_TEST_LOOPS 100000000L
#define DEFAULT_THRESHOLD 5L
long loops = DEFAULT_TEST_LOOPS;
long sec = 0;
long threshold = DEFAULT_THRESHOLD;
struct test_info {
struct spinlock lock;
u64 warps; /* warp count */
u64 stalls; /* stall count */
long long worst; /* worst warp */
volatile cycle_t last; /* last cycle seen by test */
int check; /* check cycle ? */
};
struct test_info ti[4];
static void wallclock_test(void *data)
{
int *p_err = data;
long ksec, offset;
struct timespec ts;
kvm_get_wallclock(&ts);
ksec = ts.tv_sec;
offset = ksec - sec;
printf("Raw nanoseconds value from kvmclock: %" PRIu64 " (cpu %d)\n", kvm_clock_read(), smp_id());
printf("Seconds get from kvmclock: %ld (cpu %d, offset: %ld)\n", ksec, smp_id(), offset);
if (offset > threshold || offset < -threshold) {
printf("offset too large!\n");
(*p_err)++;
}
}
static void kvm_clock_test(void *data)
{
struct test_info *hv_test_info = (struct test_info *)data;
long i, check = hv_test_info->check;
for (i = 0; i < loops; i++){
cycle_t t0, t1;
long long delta;
if (check == 0) {
kvm_clock_read();
continue;
}
spin_lock(&hv_test_info->lock);
t1 = kvm_clock_read();
t0 = hv_test_info->last;
hv_test_info->last = kvm_clock_read();
spin_unlock(&hv_test_info->lock);
delta = t1 - t0;
if (delta < 0) {
spin_lock(&hv_test_info->lock);
++hv_test_info->warps;
if (delta < hv_test_info->worst){
hv_test_info->worst = delta;
printf("Worst warp %lld\n", hv_test_info->worst);
}
spin_unlock(&hv_test_info->lock);
}
if (delta == 0)
++hv_test_info->stalls;
if (!((unsigned long)i & 31))
asm volatile("rep; nop");
}
}
static int cycle_test(int check, struct test_info *ti)
{
unsigned long long begin, end;
begin = rdtsc();
ti->check = check;
on_cpus(kvm_clock_test, ti);
end = rdtsc();
printf("Total vcpus: %d\n", cpu_count());
printf("Test loops: %ld\n", loops);
if (check == 1) {
printf("Total warps: %" PRId64 "\n", ti->warps);
printf("Total stalls: %" PRId64 "\n", ti->stalls);
printf("Worst warp: %lld\n", ti->worst);
} else
printf("TSC cycles: %lld\n", end - begin);
return ti->warps ? 1 : 0;
}
int main(int ac, char **av)
{
int nerr = 0;
int ncpus;
int i;
if (ac > 1)
loops = atol(av[1]);
if (ac > 2)
sec = atol(av[2]);
if (ac > 3)
threshold = atol(av[3]);
smp_init();
ncpus = cpu_count();
if (ncpus > MAX_CPU)
report_abort("number cpus exceeds %d", MAX_CPU);
on_cpus(kvm_clock_init, NULL);
if (ac > 2) {
printf("Wallclock test, threshold %ld\n", threshold);
printf("Seconds get from host: %ld\n", sec);
for (i = 0; i < ncpus; ++i)
on_cpu(i, wallclock_test, &nerr);
}
printf("Check the stability of raw cycle ...\n");
pvclock_set_flags(PVCLOCK_TSC_STABLE_BIT
| PVCLOCK_RAW_CYCLE_BIT);
if (cycle_test(1, &ti[0]))
printf("Raw cycle is not stable\n");
else
printf("Raw cycle is stable\n");
pvclock_set_flags(PVCLOCK_TSC_STABLE_BIT);
printf("Monotonic cycle test:\n");
nerr += cycle_test(1, &ti[1]);
printf("Measure the performance of raw cycle ...\n");
pvclock_set_flags(PVCLOCK_TSC_STABLE_BIT
| PVCLOCK_RAW_CYCLE_BIT);
cycle_test(0, &ti[2]);
printf("Measure the performance of adjusted cycle ...\n");
pvclock_set_flags(PVCLOCK_TSC_STABLE_BIT);
cycle_test(0, &ti[3]);
on_cpus(kvm_clock_clear, NULL);
return nerr > 0 ? 1 : 0;
}
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