AuroraMiddleware/mimalloc
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tracking anonymous page lifetime on macOS.

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this platform allows to tag them per application up to 255.
This commit is contained in:
David Carlier 2019-07-27 22:34:47 +01:00
parent f646cc925d
commit 82ab9b4bd6
1 changed files with 9 additions and 2 deletions
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11
src/os.c
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@ -248,6 +248,7 @@ static void* mi_unix_mmap(size_t size, size_t try_alignment, int protect_flags)
#define MAP_ANONYMOUS MAP_ANON
#endif
int flags = MAP_PRIVATE | MAP_ANONYMOUS;
int gfd = -1;
#if defined(MAP_ALIGNED) // BSD
if (try_alignment > 0) {
size_t n = _mi_bsr(try_alignment);
@ -259,6 +260,12 @@ static void* mi_unix_mmap(size_t size, size_t try_alignment, int protect_flags)
#if defined(PROT_MAX)
protect_flags |= PROT_MAX(PROT_READ | PROT_WRITE); // BSD
#endif
#if defined(VM_MAKE_TAG)
// tracking anonymous page with a specific ID
// all up to 98 are taken officially but LLVM
// sanitizers had taken 99
gfd = VM_MAKE_TAG(100);
#endif
if (large_os_page_size > 0 && use_large_os_page(size, try_alignment)) {
int lflags = flags;
int fd = -1;
@ -272,7 +279,7 @@ static void* mi_unix_mmap(size_t size, size_t try_alignment, int protect_flags)
lflags |= MAP_HUGE_2MB;
#endif
#ifdef VM_FLAGS_SUPERPAGE_SIZE_2MB
fd = VM_FLAGS_SUPERPAGE_SIZE_2MB;
fd = VM_FLAGS_SUPERPAGE_SIZE_2MB | gfd;
#endif
if (lflags != flags) {
// try large page allocation
@ -283,7 +290,7 @@ static void* mi_unix_mmap(size_t size, size_t try_alignment, int protect_flags)
}
}
if (p == NULL) {
p = mmap(NULL, size, protect_flags, flags, -1, 0);
p = mmap(NULL, size, protect_flags, flags, gfd, 0);
if (p == MAP_FAILED) p = NULL;
}
return p;