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cleanup madv_resuable

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unknown 2020-12-10 11:51:58 -08:00
parent cbc14a9287
commit f37a3db37c
2 changed files with 13 additions and 14 deletions
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23
src/os.c
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@ -721,9 +721,9 @@ static bool mi_os_commitx(void* addr, size_t size, bool commit, bool conservativ
// for commit, just change the protection
err = mprotect(start, csize, (PROT_READ | PROT_WRITE));
if (err != 0) { err = errno; }
#if defined(MADV_FREE_REUSE)
while ((err = madvise(start, csize, MADV_FREE_REUSE)) != 0 && errno == EAGAIN) {}
#endif
#if defined(MADV_FREE_REUSE)
while ((err = madvise(start, csize, MADV_FREE_REUSE)) != 0 && errno == EAGAIN) { errno = 0; }
#endif
}
#else
err = mprotect(start, csize, (commit ? (PROT_READ | PROT_WRITE) : PROT_NONE));
@ -786,17 +786,16 @@ static bool mi_os_resetx(void* addr, size_t size, bool reset, mi_stats_t* stats)
#else
#if defined(MADV_FREE)
#if defined(MADV_FREE_REUSABLE)
static _Atomic(uintptr_t) advice = ATOMIC_VAR_INIT(MADV_FREE_REUSABLE);
#define KK_MADV_FREE_INITIAL MADV_FREE_REUSABLE
#else
#define KK_MADV_FREE_INITIAL MADV_FREE
#endif
static _Atomic(uintptr_t) advice = ATOMIC_VAR_INIT(KK_MADV_FREE_INITIAL);
int oadvice = (int)mi_atomic_load_relaxed(&advice);
int err;
while ((err = madvise(start, csize, oadvice)) != 0 && errno == EAGAIN) {}
if (err != 0 && errno == EINVAL && advice == MADV_FREE_REUSABLE) {
#else
static _Atomic(uintptr_t) advice = ATOMIC_VAR_INIT(MADV_FREE);
int err = madvise(start, csize, (int)mi_atomic_load_relaxed(&advice));
if (err != 0 && errno == EINVAL && advice == MADV_FREE) {
#endif
// if MADV_FREE is not supported, fall back to MADV_DONTNEED from now on
while ((err = madvise(start, csize, oadvice)) != 0 && errno == EAGAIN) { errno = 0; };
if (err != 0 && errno == EINVAL && oadvice == KK_MADV_FREE_INITIAL) {
// if MADV_FREE/MADV_FREE_REUSABLE is not supported, fall back to MADV_DONTNEED from now on
mi_atomic_store_release(&advice, (uintptr_t)MADV_DONTNEED);
err = madvise(start, csize, MADV_DONTNEED);
}