| /* |
| * Clock functions |
| */ |
| |
| #include <math.h> |
| |
| #include "fio.h" |
| #include "os/os.h" |
| |
| #if defined(ARCH_HAVE_CPU_CLOCK) |
| #ifndef ARCH_CPU_CLOCK_CYCLES_PER_USEC |
| static unsigned long long cycles_per_msec; |
| static unsigned long long cycles_start; |
| static unsigned long long clock_mult; |
| static unsigned long long max_cycles_mask; |
| static unsigned long long nsecs_for_max_cycles; |
| static unsigned int clock_shift; |
| static unsigned int max_cycles_shift; |
| #define MAX_CLOCK_SEC 60*60 |
| #endif |
| #ifdef ARCH_CPU_CLOCK_WRAPS |
| static unsigned int cycles_wrap; |
| #endif |
| #endif |
| bool tsc_reliable = false; |
| |
| struct tv_valid { |
| 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; |
| static 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 flist_head hash[HASH_SIZE]; |
| static int gtod_inited; |
| |
| struct gtod_log { |
| 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 flist_head *entry; |
| |
| flist_for_each(entry, &hash[h]) { |
| struct gtod_log *log = flist_entry(entry, struct gtod_log, |
| list); |
| |
| if (log->caller == caller) |
| return log; |
| } |
| |
| return NULL; |
| } |
| |
| static void inc_caller(void *caller) |
| { |
| struct gtod_log *log = find_hash(caller); |
| |
| if (!log) { |
| unsigned long h; |
| |
| log = malloc(sizeof(*log)); |
| INIT_FLIST_HEAD(&log->list); |
| log->caller = caller; |
| log->calls = 0; |
| |
| h = hash_ptr(caller, HASH_BITS); |
| flist_add_tail(&log->list, &hash[h]); |
| } |
| |
| log->calls++; |
| } |
| |
| static void gtod_log_caller(void *caller) |
| { |
| if (gtod_inited) |
| inc_caller(caller); |
| } |
| |
| static void fio_exit fio_dump_gtod(void) |
| { |
| unsigned long total_calls = 0; |
| int i; |
| |
| for (i = 0; i < HASH_SIZE; i++) { |
| struct flist_head *entry; |
| struct gtod_log *log; |
| |
| flist_for_each(entry, &hash[i]) { |
| log = flist_entry(entry, struct gtod_log, list); |
| |
| printf("function %p, calls %lu\n", log->caller, |
| log->calls); |
| total_calls += log->calls; |
| } |
| } |
| |
| printf("Total %lu gettimeofday\n", total_calls); |
| } |
| |
| static void fio_init gtod_init(void) |
| { |
| int i; |
| |
| for (i = 0; i < HASH_SIZE; i++) |
| INIT_FLIST_HEAD(&hash[i]); |
| |
| gtod_inited = 1; |
| } |
| |
| #endif /* FIO_DEBUG_TIME */ |
| |
| #ifdef CONFIG_CLOCK_GETTIME |
| static int fill_clock_gettime(struct timespec *ts) |
| { |
| #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 |
| } |
| #endif |
| |
| static void __fio_gettime(struct timespec *tp) |
| { |
| switch (fio_clock_source) { |
| #ifdef CONFIG_GETTIMEOFDAY |
| case CS_GTOD: { |
| struct timeval tv; |
| gettimeofday(&tv, NULL); |
| |
| tp->tv_sec = tv.tv_sec; |
| tp->tv_nsec = tv.tv_usec * 1000; |
| break; |
| } |
| #endif |
| #ifdef CONFIG_CLOCK_GETTIME |
| case CS_CGETTIME: { |
| if (fill_clock_gettime(tp) < 0) { |
| log_err("fio: clock_gettime fails\n"); |
| assert(0); |
| } |
| break; |
| } |
| #endif |
| #ifdef ARCH_HAVE_CPU_CLOCK |
| case CS_CPUCLOCK: { |
| uint64_t nsecs, t, multiples; |
| struct tv_valid *tv; |
| |
| #ifdef CONFIG_TLS_THREAD |
| tv = &static_tv_valid; |
| #else |
| tv = pthread_getspecific(tv_tls_key); |
| #endif |
| |
| t = get_cpu_clock(); |
| #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; |
| } |
| #endif |
| #ifdef ARCH_CPU_CLOCK_CYCLES_PER_USEC |
| nsecs = t / ARCH_CPU_CLOCK_CYCLES_PER_USEC * 1000; |
| #else |
| t -= cycles_start; |
| multiples = t >> max_cycles_shift; |
| nsecs = multiples * nsecs_for_max_cycles; |
| nsecs += ((t & max_cycles_mask) * clock_mult) >> clock_shift; |
| #endif |
| tp->tv_sec = nsecs / 1000000000ULL; |
| tp->tv_nsec = nsecs % 1000000000ULL; |
| break; |
| } |
| #endif |
| default: |
| log_err("fio: invalid clock source %d\n", fio_clock_source); |
| break; |
| } |
| } |
| |
| #ifdef FIO_DEBUG_TIME |
| void fio_gettime(struct timespec *tp, void *caller) |
| #else |
| void fio_gettime(struct timespec *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); |
| } |
| |
| #if defined(ARCH_HAVE_CPU_CLOCK) && !defined(ARCH_CPU_CLOCK_CYCLES_PER_USEC) |
| static unsigned long get_cycles_per_msec(void) |
| { |
| struct timespec s, e; |
| uint64_t c_s, c_e; |
| enum fio_cs old_cs = fio_clock_source; |
| uint64_t elapsed; |
| |
| #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 { |
| __fio_gettime(&e); |
| |
| elapsed = utime_since(&s, &e); |
| if (elapsed >= 1280) { |
| c_e = get_cpu_clock(); |
| break; |
| } |
| } while (1); |
| |
| fio_clock_source = old_cs; |
| return (c_e - c_s) * 1000 / elapsed; |
| } |
| |
| #define NR_TIME_ITERS 50 |
| |
| static int calibrate_cpu_clock(void) |
| { |
| double delta, mean, S; |
| uint64_t minc, maxc, avg, cycles[NR_TIME_ITERS]; |
| int i, samples, sft = 0; |
| unsigned long long tmp, max_ticks, max_mult; |
| |
| cycles[0] = get_cycles_per_msec(); |
| S = delta = mean = 0.0; |
| for (i = 0; i < NR_TIME_ITERS; i++) { |
| cycles[i] = get_cycles_per_msec(); |
| delta = cycles[i] - mean; |
| if (delta) { |
| mean += delta / (i + 1.0); |
| S += delta * (cycles[i] - mean); |
| } |
| } |
| |
| /* |
| * 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)); |
| |
| 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++; |
| avg += this; |
| } |
| |
| S /= (double) NR_TIME_ITERS; |
| |
| for (i = 0; i < NR_TIME_ITERS; i++) |
| dprint(FD_TIME, "cycles[%d]=%llu\n", i, (unsigned long long) cycles[i]); |
| |
| avg /= samples; |
| cycles_per_msec = avg; |
| 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); |
| |
| max_ticks = MAX_CLOCK_SEC * cycles_per_msec * 1000ULL; |
| max_mult = ULLONG_MAX / max_ticks; |
| dprint(FD_TIME, "\n\nmax_ticks=%llu, __builtin_clzll=%d, " |
| "max_mult=%llu\n", max_ticks, |
| __builtin_clzll(max_ticks), max_mult); |
| |
| /* |
| * Find the largest shift count that will produce |
| * a multiplier that does not exceed max_mult |
| */ |
| tmp = max_mult * cycles_per_msec / 1000000; |
| while (tmp > 1) { |
| tmp >>= 1; |
| sft++; |
| dprint(FD_TIME, "tmp=%llu, sft=%u\n", tmp, sft); |
| } |
| |
| clock_shift = sft; |
| clock_mult = (1ULL << sft) * 1000000 / cycles_per_msec; |
| dprint(FD_TIME, "clock_shift=%u, clock_mult=%llu\n", clock_shift, |
| clock_mult); |
| |
| /* |
| * Find the greatest power of 2 clock ticks that is less than the |
| * ticks in MAX_CLOCK_SEC_2STAGE |
| */ |
| max_cycles_shift = max_cycles_mask = 0; |
| tmp = MAX_CLOCK_SEC * 1000ULL * cycles_per_msec; |
| dprint(FD_TIME, "tmp=%llu, max_cycles_shift=%u\n", tmp, |
| max_cycles_shift); |
| while (tmp > 1) { |
| tmp >>= 1; |
| max_cycles_shift++; |
| dprint(FD_TIME, "tmp=%llu, max_cycles_shift=%u\n", tmp, max_cycles_shift); |
| } |
| /* |
| * if use use (1ULL << max_cycles_shift) * 1000 / cycles_per_msec |
| * here we will have a discontinuity every |
| * (1ULL << max_cycles_shift) cycles |
| */ |
| nsecs_for_max_cycles = ((1ULL << max_cycles_shift) * clock_mult) |
| >> clock_shift; |
| |
| /* Use a bitmask to calculate ticks % (1ULL << max_cycles_shift) */ |
| for (tmp = 0; tmp < max_cycles_shift; tmp++) |
| max_cycles_mask |= 1ULL << tmp; |
| |
| dprint(FD_TIME, "max_cycles_shift=%u, 2^max_cycles_shift=%llu, " |
| "nsecs_for_max_cycles=%llu, " |
| "max_cycles_mask=%016llx\n", |
| max_cycles_shift, (1ULL << max_cycles_shift), |
| nsecs_for_max_cycles, max_cycles_mask); |
| |
| cycles_start = get_cpu_clock(); |
| dprint(FD_TIME, "cycles_start=%llu\n", cycles_start); |
| return 0; |
| } |
| #else |
| 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(void) |
| { |
| struct tv_valid *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(void) |
| { |
| } |
| #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; |
| |
| if (calibrate_cpu_clock()) |
| tsc_reliable = false; |
| |
| /* |
| * 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_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"); |
| dprint(FD_TIME, "gettime: clocksource=%d\n", (int) fio_clock_source); |
| } |
| |
| uint64_t ntime_since(const struct timespec *s, const struct timespec *e) |
| { |
| int64_t sec, nsec; |
| |
| sec = e->tv_sec - s->tv_sec; |
| nsec = e->tv_nsec - s->tv_nsec; |
| if (sec > 0 && nsec < 0) { |
| sec--; |
| nsec += 1000000000LL; |
| } |
| |
| /* |
| * time warp bug on some kernels? |
| */ |
| if (sec < 0 || (sec == 0 && nsec < 0)) |
| return 0; |
| |
| return nsec + (sec * 1000000000LL); |
| } |
| |
| uint64_t ntime_since_now(const struct timespec *s) |
| { |
| struct timespec now; |
| |
| fio_gettime(&now, NULL); |
| return ntime_since(s, &now); |
| } |
| |
| uint64_t utime_since(const struct timespec *s, const struct timespec *e) |
| { |
| int64_t sec, usec; |
| |
| sec = e->tv_sec - s->tv_sec; |
| usec = (e->tv_nsec - s->tv_nsec) / 1000; |
| if (sec > 0 && usec < 0) { |
| sec--; |
| usec += 1000000; |
| } |
| |
| /* |
| * time warp bug on some kernels? |
| */ |
| if (sec < 0 || (sec == 0 && usec < 0)) |
| return 0; |
| |
| return usec + (sec * 1000000); |
| } |
| |
| uint64_t utime_since_now(const struct timespec *s) |
| { |
| struct timespec t; |
| #ifdef FIO_DEBUG_TIME |
| void *p = __builtin_return_address(0); |
| |
| fio_gettime(&t, p); |
| #else |
| fio_gettime(&t, NULL); |
| #endif |
| |
| return utime_since(s, &t); |
| } |
| |
| uint64_t mtime_since_tv(const struct timeval *s, const struct timeval *e) |
| { |
| int64_t sec, usec; |
| |
| 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 *= 1000; |
| usec /= 1000; |
| return sec + usec; |
| } |
| |
| uint64_t mtime_since_now(const struct timespec *s) |
| { |
| struct timespec t; |
| #ifdef FIO_DEBUG_TIME |
| void *p = __builtin_return_address(0); |
| |
| fio_gettime(&t, p); |
| #else |
| fio_gettime(&t, NULL); |
| #endif |
| |
| return mtime_since(s, &t); |
| } |
| |
| uint64_t mtime_since(const struct timespec *s, const struct timespec *e) |
| { |
| int64_t sec, usec; |
| |
| sec = e->tv_sec - s->tv_sec; |
| usec = (e->tv_nsec - s->tv_nsec) / 1000; |
| if (sec > 0 && usec < 0) { |
| sec--; |
| usec += 1000000; |
| } |
| |
| if (sec < 0 || (sec == 0 && usec < 0)) |
| return 0; |
| |
| sec *= 1000; |
| usec /= 1000; |
| return sec + usec; |
| } |
| |
| uint64_t time_since_now(const struct timespec *s) |
| { |
| return mtime_since_now(s) / 1000; |
| } |
| |
| #if defined(FIO_HAVE_CPU_AFFINITY) && defined(ARCH_HAVE_CPU_CLOCK) && \ |
| defined(CONFIG_SYNC_SYNC) && defined(CONFIG_CMP_SWAP) |
| |
| #define CLOCK_ENTRIES_DEBUG 100000 |
| #define CLOCK_ENTRIES_TEST 1000 |
| |
| struct clock_entry { |
| uint32_t seq; |
| uint32_t cpu; |
| uint64_t tsc; |
| }; |
| |
| struct clock_thread { |
| pthread_t thread; |
| int cpu; |
| int debug; |
| struct fio_sem lock; |
| unsigned long nr_entries; |
| uint32_t *seq; |
| struct clock_entry *entries; |
| }; |
| |
| static inline uint32_t atomic32_compare_and_swap(uint32_t *ptr, uint32_t old, |
| uint32_t new) |
| { |
| return __sync_val_compare_and_swap(ptr, old, new); |
| } |
| |
| static void *clock_thread_fn(void *data) |
| { |
| struct clock_thread *t = data; |
| struct clock_entry *c; |
| os_cpu_mask_t cpu_mask; |
| unsigned long long first; |
| int i; |
| |
| 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) { |
| int __err = errno; |
| |
| log_err("clock setaffinity failed: %s\n", strerror(__err)); |
| goto err; |
| } |
| |
| fio_sem_down(&t->lock); |
| |
| first = get_cpu_clock(); |
| c = &t->entries[0]; |
| for (i = 0; i < t->nr_entries; i++, c++) { |
| uint32_t seq; |
| uint64_t tsc; |
| |
| c->cpu = t->cpu; |
| do { |
| seq = *t->seq; |
| if (seq == UINT_MAX) |
| break; |
| __sync_synchronize(); |
| tsc = get_cpu_clock(); |
| } while (seq != atomic32_compare_and_swap(t->seq, seq, seq + 1)); |
| |
| if (seq == UINT_MAX) |
| break; |
| |
| c->seq = seq; |
| c->tsc = 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 (i > 1 && !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) |
| { |
| 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(int debug) |
| { |
| struct clock_thread *cthreads; |
| unsigned int nr_cpus = cpus_online(); |
| struct clock_entry *entries; |
| 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; |
| |
| calibrate_cpu_clock(); |
| |
| 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)); |
| |
| if (debug) |
| log_info("cs: Testing %u CPUs\n", nr_cpus); |
| |
| for (i = 0; i < nr_cpus; i++) { |
| struct clock_thread *t = &cthreads[i]; |
| |
| t->cpu = i; |
| t->debug = debug; |
| t->seq = &seq; |
| t->nr_entries = nr_entries; |
| t->entries = &entries[i * nr_entries]; |
| __fio_sem_init(&t->lock, FIO_SEM_LOCKED); |
| 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 = &cthreads[i]; |
| |
| fio_sem_up(&t->lock); |
| } |
| |
| for (i = 0; i < nr_cpus; i++) { |
| struct clock_thread *t = &cthreads[i]; |
| void *ret; |
| |
| pthread_join(t->thread, &ret); |
| if (ret) |
| failed++; |
| __fio_sem_remove(&t->lock); |
| } |
| free(cthreads); |
| |
| if (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++) { |
| this = &entries[i]; |
| |
| if (!i) { |
| prev = this; |
| continue; |
| } |
| |
| if (prev->tsc > this->tsc) { |
| uint64_t diff = prev->tsc - this->tsc; |
| |
| 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 (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(int debug) |
| { |
| if (debug) |
| log_info("cs: current platform does not support CPU clocks\n"); |
| return 1; |
| } |
| |
| #endif |