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detect large page size on freebsd. #531

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detect large page size on freebsd. #531

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20 changes: 19 additions & 1 deletion src/os.c
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Original file line number Diff line number Diff line change
Expand Up @@ -261,14 +261,32 @@ static void os_detect_overcommit(void) {
#endif
}

static void os_detect_large_page_size() {
#if defined(__FreeBSD__)
size_t ptr[4] = {0};
size_t len = sizeof(ptr) / sizeof(ptr[0]);
getpagesizes(ptr, len);

// large page size starts from the second offset at least
for (size_t i = 1; i < len; i++) {
if (!(ptr[i] % MI_MiB)) {
large_os_page_size = ptr[i];
break;
}
}
#else
large_os_page_size = 2*MI_MiB;
#endif
}

void _mi_os_init() {
// get the page size
long result = sysconf(_SC_PAGESIZE);
if (result > 0) {
os_page_size = (size_t)result;
os_alloc_granularity = os_page_size;
}
large_os_page_size = 2*MI_MiB; // TODO: can we query the OS for this?
os_detect_large_page_size();
os_detect_overcommit();
}
#endif
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