[PATCH] Add rusage reporting to procstat

[Konstantin Belousov]

On Mon, Jan 14, 2013 at 04:39:17PM -0500, John Baldwin wrote:
> This patch adds a new -r flag to dump the resource usage information (what you 
> would get from getrusage() or wait()) for a given process.  Sample output:
> 
> % procstat -r $$
>   PID COMM             TYPE                              VALUE        
>  1428 tcsh             user time                     00:00:00.050182  
>  1428 tcsh             system time                   00:00:00.040145  
>  1428 tcsh             maximum RSS                              3328 B
>  1428 tcsh             integral shared memory                   2844 B
>  1428 tcsh             integral unshared data                   6372 B
>  1428 tcsh             integral unshared stack                  1152 B
>  1428 tcsh             page reclaims                            1306  
>  1428 tcsh             page faults                                12  
>  1428 tcsh             swaps                                       0  
>  1428 tcsh             block reads                                50  
>  1428 tcsh             block writes                                0  
>  1428 tcsh             messages sent                             172  
>  1428 tcsh             messages received                           0  
>  1428 tcsh             signals received                           33  
>  1428 tcsh             voluntary context switches               1167  
>  1428 tcsh             involuntary context switches                1  
> 
> http://www.FreeBSD.org/~jhb/patches/procstat_rusage.patch
> 
> Any thoughts, etc.?

It looks fine, but use of the human-oriented resource values, together
with spaces in names, makes the parsing of the output unfeasible.

The patch only reports the process-cumulative rusage, and not the per-thread
rusage, it seems.
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