if beg < end {
			madvise(unsafe.Pointer(beg), end-beg, _MADV_HUGEPAGE)
		}
	}
}

func sysNoHugePageOS(v unsafe.Pointer, n uintptr) {
	if uintptr(v)&(physPageSize-1) != 0 {
		// The Linux implementation requires that the address
		// addr be page-aligned, and allows length to be zero.
		throw("unaligned sysNoHugePageOS")
	}
	madvise(v, n, _MADV_NOHUGEPAGE)
}

}

func sysUnusedOS(v unsafe.Pointer, n uintptr) {
	madvise(v, n, _MADV_DONTNEED)
}

func sysUsedOS(v unsafe.Pointer, n uintptr) {
}

func sysHugePageOS(v unsafe.Pointer, n uintptr) {
}

func sysNoHugePageOS(v unsafe.Pointer, n uintptr) {
}

func sysHugePageCollapseOS(v unsafe.Pointer, n uintptr) {
}

// Don't split the stack as this function may be invoked without a valid G,

	// accurate. If called on any memory region that hasn't been
	// MADV_FREE_REUSABLE'd, it's a no-op.
	madvise(v, n, _MADV_FREE_REUSE)
}

func sysHugePageOS(v unsafe.Pointer, n uintptr) {
}

func sysNoHugePageOS(v unsafe.Pointer, n uintptr) {
}

func sysHugePageCollapseOS(v unsafe.Pointer, n uintptr) {
}

// Don't split the stack as this function may be invoked without a valid G,

		madvise(v, n, _MADV_DONTNEED)
	} else {
		madvise(v, n, _MADV_FREE)
	}
}

func sysUsedOS(v unsafe.Pointer, n uintptr) {
}

func sysHugePageOS(v unsafe.Pointer, n uintptr) {
}

func sysNoHugePageOS(v unsafe.Pointer, n uintptr) {
}

func sysHugePageCollapseOS(v unsafe.Pointer, n uintptr) {
}

// Don't split the stack as this function may be invoked without a valid G,

	unlock(&memlock)
}

func sysUnusedOS(v unsafe.Pointer, n uintptr) {
}

func sysUsedOS(v unsafe.Pointer, n uintptr) {
}

func sysHugePageOS(v unsafe.Pointer, n uintptr) {
}

func sysNoHugePageOS(v unsafe.Pointer, n uintptr) {
}

func sysHugePageCollapseOS(v unsafe.Pointer, n uintptr) {
}

func sysMapOS(v unsafe.Pointer, n uintptr) {
}

func sysFaultOS(v unsafe.Pointer, n uintptr) {
}

				throw("runtime: failed to commit pages")
			}
		}
		v = add(v, small)
		k -= small
	}
}

func sysHugePageOS(v unsafe.Pointer, n uintptr) {
}

func sysNoHugePageOS(v unsafe.Pointer, n uintptr) {
}

func sysHugePageCollapseOS(v unsafe.Pointer, n uintptr) {
}

// Don't split the stack as this function may be invoked without a valid G,

// hint to the OS that it would be less efficient to back this memory region
// with pages of a larger size transparently.
func sysNoHugePage(v unsafe.Pointer, n uintptr) {
	sysNoHugePageOS(v, n)
}

// sysHugePageCollapse attempts to immediately back the provided memory region
// with huge pages. It is best-effort and may fail silently.
func sysHugePageCollapse(v unsafe.Pointer, n uintptr) {