interface for calculating running time of process

shri8 · 06-18-2014, 12:14 AM

I want to create a simple procfs interface to calculate the total running time of process.ie on cd /proc/pid/my_running i should get the running time of the given proces.How to do this?

jpollard · 06-18-2014, 05:19 AM

Already there.

Use the "ps" command to get the statistics you want.

shri8 · 06-18-2014, 05:39 AM

ps displays all the statistics of the process but i want to get only the total running time of particular process.

syg00 · 06-18-2014, 05:48 AM

Perhaps you should read the manpage for ps to learn how to control the output - much easier than writing a kernel module.

rtmistler · 06-18-2014, 07:15 AM

Have a look at this thread, part of what the OP was doing was to calculate the CPU time for a process http://www.linuxquestions.org/questi...ss-4175505732/.

shri8 · 06-19-2014, 03:53 AM

as i am a beginner i want the steps or code to be followed for creating a simple procfs interface for calculating running time of a process.

jpollard · 06-19-2014, 04:16 AM

I think that is the wrong place to begin.

One reason is that procfs is deep in the kernel, with lots of interfaces scattered over the kernel. An error there could just crash a system, without giving sufficient information for debugging.

If you are a C programmer already, it would be better to start with the kernel newbies list and performing the slightly simpler "cleanup" functions first (http://kernelnewbies.org/). It will get you familiar with the kernel developers, style, and processes for better experience.