If it cannot find it there, a page fault occurs, and this signals the kernel to bring more pages into RAM from disk.
如果无法在RAM中找到这个页面，则出现一次缺页，这指示内核从磁盘中装载更多的页面到RAM中。
2
To resolve the page fault, the AIX kernel loads the referenced page to a location in real memory.
为了解决缺页，AIX内核会将所引用的分页加载到实际内存中的某个位置。
3
Kernel space is flagged in the page tables as exclusive to privileged code (ring 2 or lower), hence a page fault is triggered if user-mode programs try to touch it.