The /proc File System

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本文深入探讨了Linux内核中/proc文件系统的作用与使用方法，不仅作为进程信息的存放地，还扩展为内核各部分报告信息的通用平台。通过创建特定的结构并注册到内核，开发者可以利用/proc文件系统实现数据的高效存储与访问。

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来源：http://www.faqs.org/docs/kernel/x716.html

In Linux there is an additional mechanism for the kernel and kernel modules to send information to processes --- the/proc file system. Originally designed to allow easy access to information aboutprocesses (hence the name), it is now used by every bit of the kernel which has something interesting to report, such as/proc/modules which has the list of modules and /proc/meminfo which has memory usagestatistics.

The method to use the proc file system is very similar to the one used with device drivers --- you create a structurewith all the information needed for the /proc file, including pointers to any handlerfunctions (in our case there is only one, the one called when somebody attempts to read from the /proc file). Then, init_module registers the structure with the kernel andcleanup_module unregisters it.

/proc 文件系统本来是被用来存放进程信息的，后来发展成为内核中只要需要report的的部分都放在了这个文件系统中。