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《Linux® Debugging and Performance Tuning: Tips and Techniques》 chapter 5

/proc目录：

Process-Specific Subdirectories Each process subdirectory has the following entries: Entry Description auxv ELF auxiliary vector cmdline Command-line arguments cwd Link to the current working directory environ Shows all environment variables known to the process exe Link to the executable of this process fd Entries of all open files maps Memory maps for executables and libraries mem Memory for this process mounts Mounted file systems root Link to the process's root directory stat Process status in readable format statm Process memory information status Process status wchan Process predecode for a process's wait channel (wchan)

例如：

查看core文件的pattern，

/home/a/j/nomad2:cat /proc/sys/kernel/core_pattern core

查看系统最大线程数，

/home/a/j/nomad2:pwd /proc/sys/kernel /home/a/j/nomad2:cat threads-max 139264

/proc下的系统参数是可以更改的：
Some of the /proc file system parameters can be tuned. If tuning has been done on a running kernel, make sure that each file that was tuned has the new parameter set by adding it to the distribution /etc/sysctl.conf file.