[PATCH] Performance Stats: Kernel patch

[Pavel Machek]

Hi!

> Patch makes available to the user the following
> task and process performance statistics:
> 	* Involuntary Context Switches (task_struct->nivcsw)
> 	* Voluntary Context Switches (task_struct->nvcsw)
> 	* Number of system calls (added new counter
> 	  thread_info->sysall_count)
> 	           
> Statistics information is available from:
>         1. taskstats interface (Documentation/accounting/)
> 	2. /proc/PID/status (task only).
> 
> This data is useful for detecting hyperactivity
> patterns between processes.

I was told nvcsw is standard name, but given how other fields are
named ("syscall_counter") I think we should use some more reasonable
name (like "voluntary_ctxt_switches" or something).
								Pavel

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