这意味着它在每次启动时被清空，其大小将被限制在系统的RAM（内存）大小的50％。 要知道这是为什么，以及想要的行为和如何对其进行修改，请参考：API File Systems。 I FUCKING LOVE LENNART POETTERING! Now this interpretation of how a userspace should look like is implemented and was introduced with big criticism and change in the book has been removed in GCC 10. Like the init system for Unix-like systems that