Revert "Fix some mmap generating by KuraiNeko"

This reverts commit 31a7a0915375ad0916c14859db8e62eab5fa491c.
Revert "Revert "Fix some mmap generating by KuraiNeko""

This reverts commit 97060755b6824b3fd4ae5a4618c796b1c6f7900c.
Revert "Revert "Revert "Fix some mmap generating by KuraiNeko"""

This reverts commit 875ade36af703463d2f4f236149bf7c14f0ee0e3.