Merge branch 'master' of ssh://brick.kernel.dk/data/git/fio

[fio.git] / gettime.c

diff --git a/gettime.c b/gettime.c
index 352c1d3d7611be0277d3e038d737c1465f9ec820..4c998e5ff89f1dc72503f01f2552cdde78538437 100644 (file)
--- a/gettime.c
+++ b/gettime.c
@@ -441,9 +441,9 @@ uint64_t time_since_now(struct timeval *s)
 #define CLOCK_ENTRIES  100000
 
 struct clock_entry {
-       uint64_t seq;
+       uint32_t seq;
+       uint32_t cpu;
        uint64_t tsc;
-       uint64_t cpu;
 };
 
 struct clock_thread {
@@ -451,11 +451,11 @@ struct clock_thread {
        int cpu;
        pthread_mutex_t lock;
        pthread_mutex_t started;
-       uint64_t *seq;
+       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);
 }
@@ -465,6 +465,7 @@ static void *clock_thread_fn(void *data)
        struct clock_thread *t = data;
        struct clock_entry *c;
        os_cpu_mask_t cpu_mask;
+       uint32_t last_seq;
        int i;
 
        memset(&cpu_mask, 0, sizeof(cpu_mask));
@@ -478,13 +479,17 @@ static void *clock_thread_fn(void *data)
        pthread_mutex_lock(&t->lock);
        pthread_mutex_unlock(&t->started);
 
+       last_seq = 0;
        c = &t->entries[0];
        for (i = 0; i < CLOCK_ENTRIES; i++, c++) {
-               uint64_t seq, tsc;
+               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);
 
@@ -492,12 +497,14 @@ static void *clock_thread_fn(void *data)
                c->tsc = tsc;
        }
 
-       log_info("cs: cpu%3d: %lu clocks seen\n", t->cpu, t->entries[CLOCK_ENTRIES - 1].tsc - t->entries[0].tsc);
+       log_info("cs: cpu%3d: %llu clocks seen\n", t->cpu,
+               (unsigned long long) t->entries[i - 1].tsc - t->entries[0].tsc);
+
        /*
         * The most common platform clock breakage is returning zero
         * indefinitely. Check for that and return failure.
         */
-       if (!t->entries[CLOCK_ENTRIES - 1].tsc && !t->entries[0].tsc)
+       if (!t->entries[i - 1].tsc && !t->entries[0].tsc)
                return (void *) 1;
 
        return NULL;
@@ -521,7 +528,7 @@ int fio_monotonic_clocktest(void)
        struct clock_entry *entries;
        unsigned long tentries, failed;
        struct clock_entry *prev, *this;
-       uint64_t seq = 0;
+       uint32_t seq = 0;
        int i;
 
        log_info("cs: reliable_tsc: %s\n", tsc_reliable ? "yes" : "no");