*/
#include <unistd.h>
+#include <math.h>
#include <sys/time.h>
+#include <time.h>
#include "fio.h"
+#include "smalloc.h"
#include "hash.h"
+#include "os/os.h"
-static int clock_gettime_works = 0;
+#ifdef ARCH_HAVE_CPU_CLOCK
+static unsigned long cycles_per_usec;
+static unsigned long last_cycles;
+int tsc_reliable = 0;
+#endif
+static __thread struct timeval last_tv;
+static __thread int last_tv_valid;
+
+enum fio_cs fio_clock_source = FIO_PREFERRED_CLOCK_SOURCE;
+int fio_clock_source_set = 0;
+enum fio_cs fio_clock_source_inited = CS_INVAL;
#ifdef FIO_DEBUG_TIME
#define HASH_BITS 8
#define HASH_SIZE (1 << HASH_BITS)
-static struct list_head hash[HASH_SIZE];
+static struct flist_head hash[HASH_SIZE];
static int gtod_inited;
struct gtod_log {
- struct list_head list;
+ struct flist_head list;
void *caller;
unsigned long calls;
};
static struct gtod_log *find_hash(void *caller)
{
unsigned long h = hash_ptr(caller, HASH_BITS);
- struct list_head *entry;
+ struct flist_head *entry;
- list_for_each(entry, &hash[h]) {
- struct gtod_log *log = list_entry(entry, struct gtod_log, list);
+ flist_for_each(entry, &hash[h]) {
+ struct gtod_log *log = flist_entry(entry, struct gtod_log,
+ list);
if (log->caller == caller)
return log;
unsigned long h;
log = malloc(sizeof(*log));
- INIT_LIST_HEAD(&log->list);
+ INIT_FLIST_HEAD(&log->list);
log->caller = caller;
log->calls = 0;
h = hash_ptr(caller, HASH_BITS);
- list_add_tail(&log->list, &hash[h]);
+ flist_add_tail(&log->list, &hash[h]);
}
return log;
int i;
for (i = 0; i < HASH_SIZE; i++) {
- struct list_head *entry;
+ struct flist_head *entry;
struct gtod_log *log;
- list_for_each(entry, &hash[i]) {
- log = list_entry(entry, struct gtod_log, list);
+ flist_for_each(entry, &hash[i]) {
+ log = flist_entry(entry, struct gtod_log, list);
- printf("function %p, calls %lu\n", log->caller, log->calls);
+ printf("function %p, calls %lu\n", log->caller,
+ log->calls);
total_calls += log->calls;
}
}
int i;
for (i = 0; i < HASH_SIZE; i++)
- INIT_LIST_HEAD(&hash[i]);
+ INIT_FLIST_HEAD(&hash[i]);
gtod_inited = 1;
}
gtod_log_caller(caller);
#endif
- if (!clock_gettime_works) {
-gtod:
+ if (fio_tv) {
+ memcpy(tp, fio_tv, sizeof(*tp));
+ return;
+ }
+
+ switch (fio_clock_source) {
+ case CS_GTOD:
gettimeofday(tp, NULL);
- } else {
+ break;
+ case CS_CGETTIME: {
struct timespec ts;
+#ifdef FIO_HAVE_CLOCK_MONOTONIC
if (clock_gettime(CLOCK_MONOTONIC, &ts) < 0) {
- clock_gettime_works = 0;
- goto gtod;
+#else
+ if (clock_gettime(CLOCK_REALTIME, &ts) < 0) {
+#endif
+ log_err("fio: clock_gettime fails\n");
+ assert(0);
}
tp->tv_sec = ts.tv_sec;
tp->tv_usec = ts.tv_nsec / 1000;
+ break;
+ }
+#ifdef ARCH_HAVE_CPU_CLOCK
+ case CS_CPUCLOCK: {
+ unsigned long long usecs, t;
+
+ t = get_cpu_clock();
+ if (t < last_cycles) {
+ dprint(FD_TIME, "CPU clock going back in time\n");
+ t = last_cycles;
+ }
+
+ usecs = t / cycles_per_usec;
+ tp->tv_sec = usecs / 1000000;
+ tp->tv_usec = usecs % 1000000;
+ last_cycles = t;
+ break;
+ }
+#endif
+ default:
+ log_err("fio: invalid clock source %d\n", fio_clock_source);
+ break;
+ }
+
+ /*
+ * If Linux is using the tsc clock on non-synced processors,
+ * sometimes time can appear to drift backwards. Fix that up.
+ */
+ if (last_tv_valid) {
+ if (tp->tv_sec < last_tv.tv_sec)
+ tp->tv_sec = last_tv.tv_sec;
+ else if (last_tv.tv_sec == tp->tv_sec &&
+ tp->tv_usec < last_tv.tv_usec)
+ tp->tv_usec = last_tv.tv_usec;
+ }
+ last_tv_valid = 1;
+ memcpy(&last_tv, tp, sizeof(*tp));
+}
+
+#ifdef ARCH_HAVE_CPU_CLOCK
+static unsigned long get_cycles_per_usec(void)
+{
+ struct timeval s, e;
+ unsigned long long c_s, c_e;
+
+ gettimeofday(&s, NULL);
+ c_s = get_cpu_clock();
+ do {
+ unsigned long long elapsed;
+
+ gettimeofday(&e, NULL);
+ elapsed = utime_since(&s, &e);
+ if (elapsed >= 1280) {
+ c_e = get_cpu_clock();
+ break;
+ }
+ } while (1);
+
+ return (c_e - c_s + 127) >> 7;
+}
+
+#define NR_TIME_ITERS 50
+
+static void calibrate_cpu_clock(void)
+{
+ double delta, mean, S;
+ unsigned long avg, cycles[NR_TIME_ITERS];
+ int i, samples;
+
+ cycles[0] = get_cycles_per_usec();
+ S = delta = mean = 0.0;
+ for (i = 0; i < NR_TIME_ITERS; i++) {
+ cycles[i] = get_cycles_per_usec();
+ delta = cycles[i] - mean;
+ if (delta) {
+ mean += delta / (i + 1.0);
+ S += delta * (cycles[i] - mean);
+ }
+ }
+
+ S = sqrt(S / (NR_TIME_ITERS - 1.0));
+
+ samples = avg = 0;
+ for (i = 0; i < NR_TIME_ITERS; i++) {
+ double this = cycles[i];
+
+ if ((fmax(this, mean) - fmin(this, mean)) > S)
+ continue;
+ samples++;
+ avg += this;
+ }
+
+ S /= (double) NR_TIME_ITERS;
+ mean /= 10.0;
+
+ for (i = 0; i < NR_TIME_ITERS; i++)
+ dprint(FD_TIME, "cycles[%d]=%lu\n", i, cycles[i] / 10);
+
+ avg /= samples;
+ avg = (avg + 9) / 10;
+ dprint(FD_TIME, "avg: %lu\n", avg);
+ dprint(FD_TIME, "mean=%f, S=%f\n", mean, S);
+
+ cycles_per_usec = avg;
+}
+#else
+static void calibrate_cpu_clock(void)
+{
+}
+#endif
+
+void fio_clock_init(void)
+{
+ if (fio_clock_source == fio_clock_source_inited)
+ return;
+
+ last_tv_valid = 0;
+ fio_clock_source_inited = fio_clock_source;
+ calibrate_cpu_clock();
+
+ /*
+ * If the arch sets tsc_reliable != 0, then it must be good enough
+ * to use as THE clock source. For x86 CPUs, this means the TSC
+ * runs at a constant rate and is synced across CPU cores.
+ */
+ if (tsc_reliable) {
+ if (!fio_clock_source_set)
+ fio_clock_source = CS_CPUCLOCK;
+ } else if (fio_clock_source == CS_CPUCLOCK)
+ log_info("fio: clocksource=cpu may not be reliable\n");
+}
+
+unsigned long long utime_since(struct timeval *s, struct timeval *e)
+{
+ long sec, usec;
+ unsigned long long ret;
+
+ sec = e->tv_sec - s->tv_sec;
+ usec = e->tv_usec - s->tv_usec;
+ if (sec > 0 && usec < 0) {
+ sec--;
+ usec += 1000000;
}
+
+ /*
+ * time warp bug on some kernels?
+ */
+ if (sec < 0 || (sec == 0 && usec < 0))
+ return 0;
+
+ ret = sec * 1000000ULL + usec;
+
+ return ret;
+}
+
+unsigned long long utime_since_now(struct timeval *s)
+{
+ struct timeval t;
+
+ fio_gettime(&t, NULL);
+ return utime_since(s, &t);
}
+
+unsigned long mtime_since(struct timeval *s, struct timeval *e)
+{
+ long sec, usec, ret;
+
+ sec = e->tv_sec - s->tv_sec;
+ usec = e->tv_usec - s->tv_usec;
+ if (sec > 0 && usec < 0) {
+ sec--;
+ usec += 1000000;
+ }
+
+ if (sec < 0 || (sec == 0 && usec < 0))
+ return 0;
+
+ sec *= 1000UL;
+ usec /= 1000UL;
+ ret = sec + usec;
+
+ return ret;
+}
+
+unsigned long mtime_since_now(struct timeval *s)
+{
+ struct timeval t;
+ void *p = __builtin_return_address(0);
+
+ fio_gettime(&t, p);
+ return mtime_since(s, &t);
+}
+
+unsigned long time_since_now(struct timeval *s)
+{
+ return mtime_since_now(s) / 1000;
+}
+
+#if defined(FIO_HAVE_CPU_AFFINITY) && defined(ARCH_HAVE_CPU_CLOCK)
+
+#define CLOCK_ENTRIES 100000
+
+struct clock_entry {
+ unsigned long seq;
+ unsigned long tsc;
+ unsigned long cpu;
+};
+
+struct clock_thread {
+ pthread_t thread;
+ int cpu;
+ pthread_mutex_t lock;
+ pthread_mutex_t started;
+ uint64_t *seq;
+ struct clock_entry *entries;
+};
+
+static inline uint64_t atomic64_inc_return(uint64_t *seq)
+{
+ return 1 + __sync_fetch_and_add(seq, 1);
+}
+
+static void *clock_thread_fn(void *data)
+{
+ struct clock_thread *t = data;
+ struct clock_entry *c;
+ os_cpu_mask_t cpu_mask;
+ int i;
+
+ memset(&cpu_mask, 0, sizeof(cpu_mask));
+ fio_cpu_set(&cpu_mask, t->cpu);
+
+ if (fio_setaffinity(gettid(), cpu_mask) == -1) {
+ log_err("clock setaffinity failed\n");
+ return (void *) 1;
+ }
+
+ pthread_mutex_lock(&t->lock);
+ pthread_mutex_unlock(&t->started);
+
+ c = &t->entries[0];
+ for (i = 0; i < CLOCK_ENTRIES; i++, c++) {
+ uint64_t seq, tsc;
+
+ c->cpu = t->cpu;
+ do {
+ seq = atomic64_inc_return(t->seq);
+ tsc = get_cpu_clock();
+ } while (seq != *t->seq);
+
+ c->seq = seq;
+ c->tsc = tsc;
+ }
+
+ log_info("cs: cpu%3d: %lu clocks seen\n", t->cpu, t->entries[CLOCK_ENTRIES - 1].tsc - t->entries[0].tsc);
+ return NULL;
+}
+
+static int clock_cmp(const void *p1, const void *p2)
+{
+ const struct clock_entry *c1 = p1;
+ const struct clock_entry *c2 = p2;
+
+ if (c1->seq == c2->seq)
+ log_err("cs: bug in atomic sequence!\n");
+
+ return c1->seq - c2->seq;
+}
+
+int fio_monotonic_clocktest(void)
+{
+ struct clock_thread *threads;
+ unsigned int nr_cpus = cpus_online();
+ struct clock_entry *entries;
+ unsigned long tentries, failed;
+ uint64_t seq = 0;
+ int i;
+
+ fio_debug |= 1U << FD_TIME;
+ calibrate_cpu_clock();
+ fio_debug &= ~(1U << FD_TIME);
+
+ threads = malloc(nr_cpus * sizeof(struct clock_thread));
+ tentries = CLOCK_ENTRIES * nr_cpus;
+ entries = malloc(tentries * sizeof(struct clock_entry));
+
+ log_info("cs: Testing %u CPUs\n", nr_cpus);
+
+ for (i = 0; i < nr_cpus; i++) {
+ struct clock_thread *t = &threads[i];
+
+ t->cpu = i;
+ t->seq = &seq;
+ t->entries = &entries[i * CLOCK_ENTRIES];
+ pthread_mutex_init(&t->lock, NULL);
+ pthread_mutex_init(&t->started, NULL);
+ pthread_mutex_lock(&t->lock);
+ pthread_create(&t->thread, NULL, clock_thread_fn, t);
+ }
+
+ for (i = 0; i < nr_cpus; i++) {
+ struct clock_thread *t = &threads[i];
+
+ pthread_mutex_lock(&t->started);
+ }
+
+ for (i = 0; i < nr_cpus; i++) {
+ struct clock_thread *t = &threads[i];
+
+ pthread_mutex_unlock(&t->lock);
+ }
+
+ for (failed = i = 0; i < nr_cpus; i++) {
+ struct clock_thread *t = &threads[i];
+ void *ret;
+
+ pthread_join(t->thread, &ret);
+ if (ret)
+ failed++;
+ }
+ free(threads);
+
+ if (failed) {
+ log_err("Clocksource test: %u threads failed\n", failed);
+ goto err;
+ }
+
+ qsort(entries, tentries, sizeof(struct clock_entry), clock_cmp);
+
+ for (failed = i = 0; i < tentries; i++) {
+ struct clock_entry *prev, *this = &entries[i];
+
+ if (!i) {
+ prev = this;
+ continue;
+ }
+
+ if (prev->tsc > this->tsc) {
+ uint64_t diff = prev->tsc - this->tsc;
+
+ log_info("cs: CPU clock mismatch (diff=%lu):\n", diff);
+ log_info("\t CPU%3lu: TSC=%lu, SEQ=%lu\n", prev->cpu, prev->tsc, prev->seq);
+ log_info("\t CPU%3lu: TSC=%lu, SEQ=%lu\n", this->cpu, this->tsc, this->seq);
+ failed++;
+ }
+
+ prev = this;
+ }
+
+ if (failed)
+ log_info("cs: Failed: %lu\n", failed);
+ else
+ log_info("cs: Pass!\n");
+
+err:
+ free(entries);
+ return !!failed;
+}
+
+#else /* defined(FIO_HAVE_CPU_AFFINITY) && defined(ARCH_HAVE_CPU_CLOCK) */
+
+int fio_monotonic_clocktest(void)
+{
+ log_info("cs: current platform does not support CPU clocks\n");
+ return 0;
+}
+
+#endif
projects / fio.git / blobdiff