project-base/server-skynet-source-3rd-jemalloc
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Implement cache-oblivious support for huge size classes.

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This commit is contained in:
Jason Evans
2016-05-27 18:57:15 -07:00
parent 4731cd47f7
commit b46261d58b
12 changed files with 298 additions and 170 deletions
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35
include/jemalloc/internal/prng.h
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@@ -35,28 +35,45 @@
#ifdef JEMALLOC_H_INLINES
#ifndef JEMALLOC_ENABLE_INLINE
uint64_t prng_lg_range(uint64_t *state, unsigned lg_range);
uint64_t prng_range(uint64_t *state, uint64_t range);
uint64_t prng_state_next(uint64_t state);
uint64_t prng_lg_range(uint64_t *state, unsigned lg_range, bool atomic);
uint64_t prng_range(uint64_t *state, uint64_t range, bool atomic);
#endif
#if (defined(JEMALLOC_ENABLE_INLINE) || defined(JEMALLOC_PRNG_C_))
JEMALLOC_ALWAYS_INLINE uint64_t
prng_lg_range(uint64_t *state, unsigned lg_range)
prng_state_next(uint64_t state)
{
uint64_t ret;
return ((state * PRNG_A) + PRNG_C);
}
JEMALLOC_ALWAYS_INLINE uint64_t
prng_lg_range(uint64_t *state, unsigned lg_range, bool atomic)
{
uint64_t ret, state1;
assert(lg_range > 0);
assert(lg_range <= 64);
ret = (*state * PRNG_A) + PRNG_C;
*state = ret;
ret >>= (64 - lg_range);
if (atomic) {
uint64_t state0;
do {
state0 = atomic_read_uint64(state);
state1 = prng_state_next(state0);
} while (atomic_cas_uint64(state, state0, state1));
} else {
state1 = prng_state_next(*state);
*state = state1;
}
ret = state1 >> (64 - lg_range);
return (ret);
}
JEMALLOC_ALWAYS_INLINE uint64_t
prng_range(uint64_t *state, uint64_t range)
prng_range(uint64_t *state, uint64_t range, bool atomic)
{
uint64_t ret;
unsigned lg_range;
@@ -68,7 +85,7 @@ prng_range(uint64_t *state, uint64_t range)
/* Generate a result in [0..range) via repeated trial. */
do {
ret = prng_lg_range(state, lg_range);
ret = prng_lg_range(state, lg_range, atomic);
} while (ret >= range);
return (ret);