#include "hash.h"
#include "os/os.h"
-#ifdef ARCH_HAVE_CPU_CLOCK
+#if defined(ARCH_HAVE_CPU_CLOCK)
+#ifndef ARCH_CPU_CLOCK_CYCLES_PER_USEC
static unsigned long cycles_per_usec;
-int tsc_reliable = 0;
+static unsigned long inv_cycles_per_usec;
+static uint64_t max_cycles_for_mult;
+#endif
+#ifdef ARCH_CPU_CLOCK_WRAPS
+static unsigned long long cycles_start, cycles_wrap;
+#endif
#endif
+int tsc_reliable = 0;
struct tv_valid {
- struct timeval last_tv;
+ uint64_t last_cycles;
int last_tv_valid;
- unsigned long last_cycles;
+ int warned;
};
+#ifdef ARCH_HAVE_CPU_CLOCK
+#ifdef CONFIG_TLS_THREAD
+static __thread struct tv_valid static_tv_valid;
+#else
static pthread_key_t tv_tls_key;
+#endif
+#endif
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;
+static enum fio_cs fio_clock_source_inited = CS_INVAL;
#ifdef FIO_DEBUG_TIME
return NULL;
}
-static struct gtod_log *find_log(void *caller)
+static void inc_caller(void *caller)
{
struct gtod_log *log = find_hash(caller);
flist_add_tail(&log->list, &hash[h]);
}
- return log;
+ log->calls++;
}
static void gtod_log_caller(void *caller)
{
- if (gtod_inited) {
- struct gtod_log *log = find_log(caller);
-
- log->calls++;
- }
+ if (gtod_inited)
+ inc_caller(caller);
}
static void fio_exit fio_dump_gtod(void)
#endif /* FIO_DEBUG_TIME */
+#ifdef CONFIG_CLOCK_GETTIME
static int fill_clock_gettime(struct timespec *ts)
{
-#ifdef FIO_HAVE_CLOCK_MONOTONIC
+#if defined(CONFIG_CLOCK_MONOTONIC_RAW)
+ return clock_gettime(CLOCK_MONOTONIC_RAW, ts);
+#elif defined(CONFIG_CLOCK_MONOTONIC)
return clock_gettime(CLOCK_MONOTONIC, ts);
#else
return clock_gettime(CLOCK_REALTIME, ts);
#endif
}
-
-#ifdef FIO_DEBUG_TIME
-void fio_gettime(struct timeval *tp, void *caller)
-#else
-void fio_gettime(struct timeval *tp, void fio_unused *caller)
-#endif
-{
- struct tv_valid *tv;
-
-#ifdef FIO_DEBUG_TIME
- if (!caller)
- caller = __builtin_return_address(0);
-
- gtod_log_caller(caller);
#endif
- if (fio_tv) {
- memcpy(tp, fio_tv, sizeof(*tp));
- return;
- }
-
- tv = pthread_getspecific(tv_tls_key);
+static void __fio_gettime(struct timeval *tp)
+{
switch (fio_clock_source) {
+#ifdef CONFIG_GETTIMEOFDAY
case CS_GTOD:
gettimeofday(tp, NULL);
break;
+#endif
+#ifdef CONFIG_CLOCK_GETTIME
case CS_CGETTIME: {
struct timespec ts;
tp->tv_usec = ts.tv_nsec / 1000;
break;
}
+#endif
#ifdef ARCH_HAVE_CPU_CLOCK
case CS_CPUCLOCK: {
- unsigned long long usecs, t;
+ uint64_t usecs, t;
+ struct tv_valid *tv;
+
+#ifdef CONFIG_TLS_THREAD
+ tv = &static_tv_valid;
+#else
+ tv = pthread_getspecific(tv_tls_key);
+#endif
t = get_cpu_clock();
- if (tv && t < tv->last_cycles) {
- dprint(FD_TIME, "CPU clock going back in time\n");
- t = tv->last_cycles;
- } else if (tv)
- tv->last_cycles = t;
+#ifdef ARCH_CPU_CLOCK_WRAPS
+ if (t < cycles_start && !cycles_wrap)
+ cycles_wrap = 1;
+ else if (cycles_wrap && t >= cycles_start && !tv->warned) {
+ log_err("fio: double CPU clock wrap\n");
+ tv->warned = 1;
+ }
- usecs = t / cycles_per_usec;
+ t -= cycles_start;
+#endif
+ tv->last_cycles = t;
+ tv->last_tv_valid = 1;
+#ifdef ARCH_CPU_CLOCK_CYCLES_PER_USEC
+ usecs = t / ARCH_CPU_CLOCK_CYCLES_PER_USEC;
+#else
+ if (t < max_cycles_for_mult)
+ usecs = (t * inv_cycles_per_usec) / 16777216UL;
+ else
+ usecs = t / cycles_per_usec;
+#endif
tp->tv_sec = usecs / 1000000;
tp->tv_usec = usecs % 1000000;
break;
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 (tv) {
- if (tv->last_tv_valid) {
- if (tp->tv_sec < tv->last_tv.tv_sec)
- tp->tv_sec = tv->last_tv.tv_sec;
- else if (tv->last_tv.tv_sec == tp->tv_sec &&
- tp->tv_usec < tv->last_tv.tv_usec)
- tp->tv_usec = tv->last_tv.tv_usec;
- }
- tv->last_tv_valid = 1;
- memcpy(&tv->last_tv, tp, sizeof(*tp));
- }
+#ifdef FIO_DEBUG_TIME
+void fio_gettime(struct timeval *tp, void *caller)
+#else
+void fio_gettime(struct timeval *tp, void fio_unused *caller)
+#endif
+{
+#ifdef FIO_DEBUG_TIME
+ if (!caller)
+ caller = __builtin_return_address(0);
+
+ gtod_log_caller(caller);
+#endif
+ if (fio_unlikely(fio_gettime_offload(tp)))
+ return;
+
+ __fio_gettime(tp);
}
-#ifdef ARCH_HAVE_CPU_CLOCK
+#if defined(ARCH_HAVE_CPU_CLOCK) && !defined(ARCH_CPU_CLOCK_CYCLES_PER_USEC)
static unsigned long get_cycles_per_usec(void)
{
- struct timespec ts;
struct timeval s, e;
- unsigned long long c_s, c_e;
+ uint64_t c_s, c_e;
+ enum fio_cs old_cs = fio_clock_source;
+ uint64_t elapsed;
- fill_clock_gettime(&ts);
- s.tv_sec = ts.tv_sec;
- s.tv_usec = ts.tv_nsec / 1000;
+#ifdef CONFIG_CLOCK_GETTIME
+ fio_clock_source = CS_CGETTIME;
+#else
+ fio_clock_source = CS_GTOD;
+#endif
+ __fio_gettime(&s);
c_s = get_cpu_clock();
do {
- unsigned long long elapsed;
-
- fill_clock_gettime(&ts);
- e.tv_sec = ts.tv_sec;
- e.tv_usec = ts.tv_nsec / 1000;
+ __fio_gettime(&e);
elapsed = utime_since(&s, &e);
if (elapsed >= 1280) {
}
} while (1);
- return (c_e - c_s + 127) >> 7;
+ fio_clock_source = old_cs;
+ return (c_e - c_s) / elapsed;
}
#define NR_TIME_ITERS 50
-static void calibrate_cpu_clock(void)
+static int calibrate_cpu_clock(void)
{
double delta, mean, S;
- unsigned long avg, cycles[NR_TIME_ITERS];
+ uint64_t minc, maxc, avg, cycles[NR_TIME_ITERS];
int i, samples;
cycles[0] = get_cycles_per_usec();
}
}
+ /*
+ * The most common platform clock breakage is returning zero
+ * indefinitely. Check for that and return failure.
+ */
+ if (!cycles[0] && !cycles[NR_TIME_ITERS - 1])
+ return 1;
+
S = sqrt(S / (NR_TIME_ITERS - 1.0));
- samples = avg = 0;
+ minc = -1ULL;
+ maxc = samples = avg = 0;
for (i = 0; i < NR_TIME_ITERS; i++) {
double this = cycles[i];
+ minc = min(cycles[i], minc);
+ maxc = max(cycles[i], maxc);
+
if ((fmax(this, mean) - fmin(this, mean)) > S)
continue;
samples++;
}
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);
+ dprint(FD_TIME, "cycles[%d]=%llu\n", i, (unsigned long long) cycles[i]);
avg /= samples;
- avg = (avg + 9) / 10;
- dprint(FD_TIME, "avg: %lu\n", avg);
- dprint(FD_TIME, "mean=%f, S=%f\n", mean, S);
+ dprint(FD_TIME, "avg: %llu\n", (unsigned long long) avg);
+ dprint(FD_TIME, "min=%llu, max=%llu, mean=%f, S=%f\n",
+ (unsigned long long) minc,
+ (unsigned long long) maxc, mean, S);
cycles_per_usec = avg;
+ inv_cycles_per_usec = 16777216UL / cycles_per_usec;
+ max_cycles_for_mult = ~0ULL / inv_cycles_per_usec;
+ dprint(FD_TIME, "inv_cycles_per_usec=%lu\n", inv_cycles_per_usec);
+#ifdef ARCH_CPU_CLOCK_WRAPS
+ cycles_start = get_cpu_clock();
+ dprint(FD_TIME, "cycles_start=%llu\n", cycles_start);
+#endif
+ return 0;
}
#else
-static void calibrate_cpu_clock(void)
+static int calibrate_cpu_clock(void)
{
-}
+#ifdef ARCH_CPU_CLOCK_CYCLES_PER_USEC
+ return 0;
+#else
+ return 1;
#endif
+}
+#endif // ARCH_HAVE_CPU_CLOCK
+#ifndef CONFIG_TLS_THREAD
void fio_local_clock_init(int is_thread)
{
struct tv_valid *t;
- t = calloc(sizeof(*t), 1);
- if (pthread_setspecific(tv_tls_key, t))
+ t = calloc(1, sizeof(*t));
+ if (pthread_setspecific(tv_tls_key, t)) {
log_err("fio: can't set TLS key\n");
+ assert(0);
+ }
}
static void kill_tv_tls_key(void *data)
{
free(data);
}
+#else
+void fio_local_clock_init(int is_thread)
+{
+}
+#endif
void fio_clock_init(void)
{
if (fio_clock_source == fio_clock_source_inited)
return;
+#ifndef CONFIG_TLS_THREAD
if (pthread_key_create(&tv_tls_key, kill_tv_tls_key))
log_err("fio: can't create TLS key\n");
+#endif
fio_clock_source_inited = fio_clock_source;
- calibrate_cpu_clock();
+
+ if (calibrate_cpu_clock())
+ tsc_reliable = 0;
/*
* If the arch sets tsc_reliable != 0, then it must be good enough
* runs at a constant rate and is synced across CPU cores.
*/
if (tsc_reliable) {
- if (!fio_clock_source_set)
+ if (!fio_clock_source_set && !fio_monotonic_clocktest(0))
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)
+uint64_t utime_since(const struct timeval *s, const struct timeval *e)
{
- long sec, usec;
- unsigned long long ret;
+ int64_t sec, usec;
sec = e->tv_sec - s->tv_sec;
usec = e->tv_usec - s->tv_usec;
if (sec < 0 || (sec == 0 && usec < 0))
return 0;
- ret = sec * 1000000ULL + usec;
-
- return ret;
+ return usec + (sec * 1000000);
}
-unsigned long long utime_since_now(struct timeval *s)
+uint64_t utime_since_now(const struct timeval *s)
{
struct timeval t;
return utime_since(s, &t);
}
-unsigned long mtime_since(struct timeval *s, struct timeval *e)
+uint64_t mtime_since(const struct timeval *s, const struct timeval *e)
{
- long sec, usec, ret;
+ long sec, usec;
sec = e->tv_sec - s->tv_sec;
usec = e->tv_usec - s->tv_usec;
if (sec < 0 || (sec == 0 && usec < 0))
return 0;
- sec *= 1000UL;
- usec /= 1000UL;
- ret = sec + usec;
-
- return ret;
+ sec *= 1000;
+ usec /= 1000;
+ return sec + usec;
}
-unsigned long mtime_since_now(struct timeval *s)
+uint64_t mtime_since_now(const struct timeval *s)
{
struct timeval t;
void *p = __builtin_return_address(0);
return mtime_since(s, &t);
}
-unsigned long time_since_now(struct timeval *s)
+uint64_t time_since_now(const struct timeval *s)
{
return mtime_since_now(s) / 1000;
}
-#if defined(FIO_HAVE_CPU_AFFINITY) && defined(ARCH_HAVE_CPU_CLOCK)
+#if defined(FIO_HAVE_CPU_AFFINITY) && defined(ARCH_HAVE_CPU_CLOCK) && \
+ defined(CONFIG_SFAA)
-#define CLOCK_ENTRIES 100000
+#define CLOCK_ENTRIES_DEBUG 100000
+#define CLOCK_ENTRIES_TEST 10000
struct clock_entry {
- unsigned long seq;
- unsigned long tsc;
- unsigned long cpu;
+ uint32_t seq;
+ uint32_t cpu;
+ uint64_t tsc;
};
struct clock_thread {
pthread_t thread;
int cpu;
+ int debug;
pthread_mutex_t lock;
pthread_mutex_t started;
- uint64_t *seq;
+ unsigned long nr_entries;
+ uint32_t *seq;
struct clock_entry *entries;
};
-static inline uint64_t atomic64_inc_return(uint64_t *seq)
+static inline uint32_t atomic32_inc_return(uint32_t *seq)
{
return 1 + __sync_fetch_and_add(seq, 1);
}
struct clock_thread *t = data;
struct clock_entry *c;
os_cpu_mask_t cpu_mask;
+ uint32_t last_seq;
+ unsigned long long first;
int i;
- memset(&cpu_mask, 0, sizeof(cpu_mask));
+ if (fio_cpuset_init(&cpu_mask)) {
+ int __err = errno;
+
+ log_err("clock cpuset init failed: %s\n", strerror(__err));
+ goto err_out;
+ }
+
fio_cpu_set(&cpu_mask, t->cpu);
if (fio_setaffinity(gettid(), cpu_mask) == -1) {
- log_err("clock setaffinity failed\n");
- return (void *) 1;
+ int __err = errno;
+
+ log_err("clock setaffinity failed: %s\n", strerror(__err));
+ goto err;
}
pthread_mutex_lock(&t->lock);
pthread_mutex_unlock(&t->started);
+ first = get_cpu_clock();
+ last_seq = 0;
c = &t->entries[0];
- for (i = 0; i < CLOCK_ENTRIES; i++, c++) {
- uint64_t seq, tsc;
+ for (i = 0; i < t->nr_entries; i++, c++) {
+ uint32_t seq;
+ uint64_t tsc;
c->cpu = t->cpu;
do {
- seq = atomic64_inc_return(t->seq);
+ seq = atomic32_inc_return(t->seq);
+ if (seq < last_seq)
+ break;
tsc = get_cpu_clock();
} while (seq != *t->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);
+ if (t->debug) {
+ unsigned long long clocks;
+
+ clocks = t->entries[i - 1].tsc - t->entries[0].tsc;
+ log_info("cs: cpu%3d: %llu clocks seen, first %llu\n", t->cpu,
+ clocks, first);
+ }
+
+ /*
+ * The most common platform clock breakage is returning zero
+ * indefinitely. Check for that and return failure.
+ */
+ if (!t->entries[i - 1].tsc && !t->entries[0].tsc)
+ goto err;
+
+ fio_cpuset_exit(&cpu_mask);
return NULL;
+err:
+ fio_cpuset_exit(&cpu_mask);
+err_out:
+ return (void *) 1;
}
static int clock_cmp(const void *p1, const void *p2)
return c1->seq - c2->seq;
}
-int fio_monotonic_clocktest(void)
+int fio_monotonic_clocktest(int debug)
{
- struct clock_thread *threads;
+ struct clock_thread *cthreads;
unsigned int nr_cpus = cpus_online();
struct clock_entry *entries;
- unsigned long tentries, failed;
- uint64_t seq = 0;
- int i;
+ unsigned long nr_entries, tentries, failed = 0;
+ struct clock_entry *prev, *this;
+ uint32_t seq = 0;
+ unsigned int i;
+
+ if (debug) {
+ log_info("cs: reliable_tsc: %s\n", tsc_reliable ? "yes" : "no");
+
+#ifdef FIO_INC_DEBUG
+ fio_debug |= 1U << FD_TIME;
+#endif
+ nr_entries = CLOCK_ENTRIES_DEBUG;
+ } else
+ nr_entries = CLOCK_ENTRIES_TEST;
- 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;
+ if (debug) {
+#ifdef FIO_INC_DEBUG
+ fio_debug &= ~(1U << FD_TIME);
+#endif
+ }
+
+ cthreads = malloc(nr_cpus * sizeof(struct clock_thread));
+ tentries = nr_entries * nr_cpus;
entries = malloc(tentries * sizeof(struct clock_entry));
- log_info("cs: Testing %u CPUs\n", nr_cpus);
+ if (debug)
+ log_info("cs: Testing %u CPUs\n", nr_cpus);
for (i = 0; i < nr_cpus; i++) {
- struct clock_thread *t = &threads[i];
+ struct clock_thread *t = &cthreads[i];
t->cpu = i;
+ t->debug = debug;
t->seq = &seq;
- t->entries = &entries[i * CLOCK_ENTRIES];
+ t->nr_entries = nr_entries;
+ t->entries = &entries[i * nr_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);
+ if (pthread_create(&t->thread, NULL, clock_thread_fn, t)) {
+ failed++;
+ nr_cpus = i;
+ break;
+ }
}
for (i = 0; i < nr_cpus; i++) {
- struct clock_thread *t = &threads[i];
+ struct clock_thread *t = &cthreads[i];
pthread_mutex_lock(&t->started);
}
for (i = 0; i < nr_cpus; i++) {
- struct clock_thread *t = &threads[i];
+ struct clock_thread *t = &cthreads[i];
pthread_mutex_unlock(&t->lock);
}
- for (failed = i = 0; i < nr_cpus; i++) {
- struct clock_thread *t = &threads[i];
+ for (i = 0; i < nr_cpus; i++) {
+ struct clock_thread *t = &cthreads[i];
void *ret;
pthread_join(t->thread, &ret);
if (ret)
failed++;
}
- free(threads);
+ free(cthreads);
if (failed) {
- log_err("Clocksource test: %u threads failed\n", failed);
+ if (debug)
+ log_err("Clocksource test: %lu threads failed\n", failed);
goto err;
}
qsort(entries, tentries, sizeof(struct clock_entry), clock_cmp);
+ /* silence silly gcc */
+ prev = NULL;
for (failed = i = 0; i < tentries; i++) {
- struct clock_entry *prev, *this = &entries[i];
+ this = &entries[i];
if (!i) {
prev = this;
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);
+ if (!debug) {
+ failed++;
+ break;
+ }
+
+ log_info("cs: CPU clock mismatch (diff=%llu):\n",
+ (unsigned long long) diff);
+ log_info("\t CPU%3u: TSC=%llu, SEQ=%u\n", prev->cpu, (unsigned long long) prev->tsc, prev->seq);
+ log_info("\t CPU%3u: TSC=%llu, SEQ=%u\n", this->cpu, (unsigned long long) this->tsc, this->seq);
failed++;
}
prev = this;
}
- if (failed)
- log_info("cs: Failed: %lu\n", failed);
- else
- log_info("cs: Pass!\n");
-
+ if (debug) {
+ 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)
+int fio_monotonic_clocktest(int debug)
{
- log_info("cs: current platform does not support CPU clocks\n");
- return 0;
+ if (debug)
+ log_info("cs: current platform does not support CPU clocks\n");
+ return 1;
}
#endif