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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.