*/
+#include <string.h>
#include "rand.h"
+#include "pattern.h"
#include "../hash.h"
-struct frand_state __fio_rand_state;
+int arch_random;
-static inline int __seed(unsigned int x, unsigned int m)
+static inline uint64_t __seed(uint64_t x, uint64_t m)
{
return (x < m) ? x + m : x;
}
-void init_rand(struct frand_state *state)
+static void __init_rand32(struct taus88_state *state, unsigned int seed)
{
-#define LCG(x) ((x) * 69069) /* super-duper LCG */
-
- state->s1 = __seed(LCG((2^31) + (2^17) + (2^7)), 1);
- state->s2 = __seed(LCG(state->s1), 7);
- state->s3 = __seed(LCG(state->s2), 15);
-
- __rand(state);
- __rand(state);
- __rand(state);
- __rand(state);
- __rand(state);
- __rand(state);
+ int cranks = 6;
+
+#define LCG(x, seed) ((x) * 69069 ^ (seed))
+
+ state->s1 = __seed(LCG((2^31) + (2^17) + (2^7), seed), 1);
+ state->s2 = __seed(LCG(state->s1, seed), 7);
+ state->s3 = __seed(LCG(state->s2, seed), 15);
+
+ while (cranks--)
+ __rand32(state);
+}
+
+void __init_rand64(struct taus258_state *state, uint64_t seed)
+{
+ int cranks = 6;
+
+#define LCG64(x, seed) ((x) * 6906969069ULL ^ (seed))
+
+ state->s1 = __seed(LCG64((2^31) + (2^17) + (2^7), seed), 1);
+ state->s2 = __seed(LCG64(state->s1, seed), 7);
+ state->s3 = __seed(LCG64(state->s2, seed), 15);
+ state->s4 = __seed(LCG64(state->s3, seed), 33);
+ state->s5 = __seed(LCG64(state->s4, seed), 49);
+
+ while (cranks--)
+ __rand64(state);
+}
+
+void init_rand(struct frand_state *state, bool use64)
+{
+ state->use64 = use64;
+
+ if (!use64)
+ __init_rand32(&state->state32, 1);
+ else
+ __init_rand64(&state->state64, 1);
+}
+
+void init_rand_seed(struct frand_state *state, uint64_t seed, bool use64)
+{
+ state->use64 = use64;
+
+ if (!use64)
+ __init_rand32(&state->state32, (unsigned int) seed);
+ else
+ __init_rand64(&state->state64, seed);
+}
+
+void __fill_random_buf_small(void *buf, unsigned int len, uint64_t seed)
+{
+ uint64_t *b = buf;
+ uint64_t *e = b + len / sizeof(*b);
+ unsigned int rest = len % sizeof(*b);
+
+ for (; b != e; ++b) {
+ *b = seed;
+ seed = __hash_u64(seed);
+ }
+
+ if (fio_unlikely(rest))
+ __builtin_memcpy(e, &seed, rest);
+}
+
+void __fill_random_buf(void *buf, unsigned int len, uint64_t seed)
+{
+ static uint64_t prime[] = {1, 2, 3, 5, 7, 11, 13, 17,
+ 19, 23, 29, 31, 37, 41, 43, 47};
+ uint64_t *b, *e, s[CONFIG_SEED_BUCKETS];
+ unsigned int rest;
+ int p;
+
+ /*
+ * Calculate the max index which is multiples of the seed buckets.
+ */
+ rest = (len / sizeof(*b) / CONFIG_SEED_BUCKETS) * CONFIG_SEED_BUCKETS;
+
+ b = buf;
+ e = b + rest;
+
+ rest = len - (rest * sizeof(*b));
+
+ for (p = 0; p < CONFIG_SEED_BUCKETS; p++)
+ s[p] = seed * prime[p];
+
+ for (; b != e; b += CONFIG_SEED_BUCKETS) {
+ for (p = 0; p < CONFIG_SEED_BUCKETS; ++p) {
+ b[p] = s[p];
+ s[p] = __hash_u64(s[p]);
+ }
+ }
+
+ __fill_random_buf_small(b, rest, s[0]);
}
-void fill_random_buf(void *buf, unsigned int len)
+uint64_t fill_random_buf(struct frand_state *fs, void *buf,
+ unsigned int len)
{
- unsigned long r = __rand(&__fio_rand_state);
- long *ptr = buf;
+ uint64_t r = __get_next_seed(fs);
+
+ __fill_random_buf(buf, len, r);
+ return r;
+}
- if (sizeof(int) != sizeof(*ptr))
- r *= (unsigned long) __rand(&__fio_rand_state);
+void __fill_random_buf_percentage(uint64_t seed, void *buf,
+ unsigned int percentage,
+ unsigned int segment, unsigned int len,
+ char *pattern, unsigned int pbytes)
+{
+ unsigned int this_len;
+
+ if (percentage == 100) {
+ if (pbytes)
+ (void)cpy_pattern(pattern, pbytes, buf, len);
+ else
+ memset(buf, 0, len);
+ return;
+ }
- while ((void *) ptr - buf < len) {
- *ptr = r;
- ptr++;
- r *= GOLDEN_RATIO_PRIME;
- r >>= 3;
+ if (segment > len)
+ segment = len;
+
+ while (len) {
+ /*
+ * Fill random chunk
+ */
+ this_len = ((unsigned long long)segment * (100 - percentage)) / 100;
+ if (this_len > len)
+ this_len = len;
+
+ __fill_random_buf(buf, this_len, seed);
+
+ len -= this_len;
+ if (!len)
+ break;
+ buf += this_len;
+ this_len = segment - this_len;
+
+ if (this_len > len)
+ this_len = len;
+ else if (len - this_len <= sizeof(long))
+ this_len = len;
+
+ if (pbytes)
+ (void)cpy_pattern(pattern, pbytes, buf, this_len);
+ else
+ memset(buf, 0, this_len);
+
+ len -= this_len;
+ buf += this_len;
}
}
+
+uint64_t fill_random_buf_percentage(struct frand_state *fs, void *buf,
+ unsigned int percentage,
+ unsigned int segment, unsigned int len,
+ char *pattern, unsigned int pbytes)
+{
+ uint64_t r = __get_next_seed(fs);
+
+ __fill_random_buf_percentage(r, buf, percentage, segment, len,
+ pattern, pbytes);
+ return r;
+}
projects / fio.git / blobdiff