The 2.4 kernel sometimes suffers with higher Numbers of PIDs requested by applications due to the low PID limit it allows.
由于允许的PID上限较低，2.4内核有时会出现应用程序请求的PID编号过高的情况。
When maxperm is a strict-limit, the kernel does not allow the number of non-computational pages to exceed maxperm, even if there is free memory available.
当maxperm是严格限制的时候，即使有可供使用的空闲内存，内核也不允许非计算性分页的数目超出maxperm的限制。
If the number of free pages in the system falls below this limit, the kernel will start swapping more aggressively to free memory and maintain system performance.
如果系统中可用页面的数目低于这一限制，则内核将以较积极的方式启动交换，以释放内存，从而维持系统性能。
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