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improve handling of huge pages in the cache

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This commit is contained in:
daan 2019-06-23 23:15:42 -07:00
parent 43568fa422
commit cd7aa0ce83
5 changed files with 86 additions and 39 deletions
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28
src/os.c
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@ -66,9 +66,9 @@ size_t _mi_os_page_size() {
}
static void mi_munmap(void* addr, size_t size)
static bool mi_munmap(void* addr, size_t size)
{
if (addr == NULL || size == 0) return;
if (addr == NULL || size == 0) return true;
bool err = false;
#if defined(_WIN32)
err = (VirtualFree(addr, 0, MEM_RELEASE) == 0);
@ -78,6 +78,10 @@ static void mi_munmap(void* addr, size_t size)
if (err) {
#pragma warning(suppress:4996)
_mi_warning_message("munmap failed: %s, addr 0x%8li, size %lu\n", strerror(errno), (size_t)addr, size);
return false;
}
else {
return true;
}
}
@ -193,6 +197,26 @@ bool _mi_os_unprotect(void* addr, size_t size) {
return mi_os_protectx(addr, size, false);
}
bool _mi_os_shrink(void* p, size_t oldsize, size_t newsize) {
// page align conservatively within the range
mi_assert_internal(oldsize > newsize && p != NULL);
if (oldsize < newsize || p==NULL) return false;
if (oldsize == newsize) return true;
// oldsize and newsize should be page aligned or we cannot shrink precisely
void* addr = (uint8_t*)p + newsize;
size_t size = 0;
void* start = mi_os_page_align_region(addr, oldsize - newsize, &size);
if (size==0 || start != addr) return false;
#ifdef _WIN32
// we cannot shrink on windows
return false;
#else
return mi_munmap( start, size );
#endif
}
/* -----------------------------------------------------------
OS allocation using mmap/munmap
----------------------------------------------------------- */