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Merge pull request #141 from devnexen/mac_os_anon_pg_option

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macOS: anonymous page ID make it as env var.
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Daan 2019-08-27 16:39:26 -07:00 committed by GitHub
commit a7d0d19b07
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3 changed files with 6 additions and 2 deletions
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1
include/mimalloc.h
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@ -232,6 +232,7 @@ typedef enum mi_option_e {
mi_option_page_reset,
mi_option_cache_reset,
mi_option_reset_decommits,
mi_option_os_tag,
_mi_option_last
} mi_option_t;

3
src/options.c
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@ -68,7 +68,8 @@ static mi_option_desc_t options[_mi_option_last] =
{ 0, UNINIT, MI_OPTION(segment_cache) }, // cache N segments per thread
{ 0, UNINIT, MI_OPTION(page_reset) },
{ 0, UNINIT, MI_OPTION(cache_reset) },
{ 0, UNINIT, MI_OPTION(reset_decommits) } // note: cannot enable this if secure is on
{ 0, UNINIT, MI_OPTION(reset_decommits) }, // note: cannot enable this if secure is on
{ 100, UNINIT, MI_OPTION(os_tag) } // only apple specific for now but might serve more or less related purpose
};
static void mi_option_init(mi_option_desc_t* desc);

4
src/os.c
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@ -288,7 +288,9 @@ static void* mi_unix_mmap(size_t size, size_t try_alignment, int protect_flags)
#endif
#if defined(VM_MAKE_TAG)
// macOS: tracking anonymous page with a specific ID. (All up to 98 are taken officially but LLVM sanitizers had taken 99)
fd = VM_MAKE_TAG(100);
int os_tag = (int)mi_option_get(mi_option_os_tag);
if (os_tag < 100 || os_tag > 255) os_tag = 100;
fd = VM_MAKE_TAG(os_tag);
#endif
if (use_large_os_page(size, try_alignment)) {
static volatile _Atomic(uintptr_t) large_page_try_ok; // = 0;