proc之sysrq-trigger

一直想花点时间细研究下proc下的各个文件,结果确一直没做,只是零星的在做其他事情是了解到/proc下某个文件的功能,每每了解到都感叹/proc的精妙。sysrq-trgger也一样,这是在研究kdump时的一个副产品。



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    /proc/sysrq-trigger该文件能做些什么事情呢?&nbsp;<br />

立即重新启动计算机 (Reboots the kernel without first unmounting file systems or syncing disks attached to the system)

echo “b” > /proc/sysrq-trigger 

立即关闭计算机(shuts off the system)

echo “o” > /proc/sysrq-trigger

导出内存分配的信息 (可以用/var/log/message 查看)(Outputs memory statistics to the console) 

echo “m” > /proc/sysrq-trigger 

导出当前CPU寄存器信息和标志位的信息(Outputs all flags and registers to the console)

echo “p” > /proc/sysrq-trigger 

导出线程状态信息 (Outputs a list of processes to the console)

echo “t” > /proc/sysrq-trigger

故意让系统崩溃 ( Crashes the system without first unmounting file systems or syncing disks attached to the system)

echo “c” > /proc/sysrq-trigger

立即重新挂载所有的文件系统 (Attempts to sync disks attached to the system)

echo “s” > /proc/sysrq-trigger 

立即重新挂载所有的文件系统为只读 (Attempts to unmount and remount all file systems as read-only)

echo “u” > /proc/sysrq-trigger

 
#启动kgdb调试 
echo g > /proc/sysrq-trigger

呵呵,此外还有两个,类似于强制注销的功能
e — Kills all processes except init using SIGTERM
i — Kills all processes except init using SIGKILL