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initial support of 2MB pages on Mac

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This commit is contained in:
David Carlier 2019-07-05 20:05:04 +01:00
parent 5ff037f8f8
commit a192d6893e
1 changed files with 8 additions and 1 deletions
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9
src/os.c
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@ -19,6 +19,9 @@ terms of the MIT license. A copy of the license can be found in the file
#else
#include <sys/mman.h> // mmap
#include <unistd.h> // sysconf
#if defined(__APPLE__)
#include <mach/vm_statistics.h>
#endif
#endif
/* -----------------------------------------------------------
@ -219,6 +222,7 @@ static void* mi_unix_mmap(size_t size, size_t try_alignment, int protect_flags)
#endif
if (large_os_page_size > 0 && use_large_os_page(size, try_alignment)) {
int lflags = flags;
int fd = -1;
#ifdef MAP_ALIGNED_SUPER
lflags |= MAP_ALIGNED_SUPER;
#endif
@ -228,11 +232,14 @@ static void* mi_unix_mmap(size_t size, size_t try_alignment, int protect_flags)
#ifdef MAP_HUGE_2MB
lflags |= MAP_HUGE_2MB;
#endif
#ifdef VM_FLAGS_SUPERPAGE_SIZE_2MB
fd = VM_FLAGS_SUPERPAGE_SIZE_2MB;
#endif
if (lflags != flags) {
// try large page allocation
// TODO: if always failing due to permissions or no huge pages, try to avoid repeatedly trying?
// Should we check this in _mi_os_init? (as on Windows)
p = mmap(NULL, size, protect_flags, lflags, -1, 0);
p = mmap(NULL, size, protect_flags, lflags, fd, 0);
if (p == MAP_FAILED) p = NULL; // fall back to regular mmap if large is exhausted or no permission
}
}