/prod/<pid>/stat additions

[Martins Innus <minnus@xxxxxxxxxxx>]

Hi,
    I filled in missing fields from stat for the linux_proc_pmda:

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github.com/ubccr/pcp/tree/martins-working

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commit ed47714c15b254903e47d3b0dc45d04f030d7a78
Author: Martins Innus <minnus@xxxxxxxxxxx>
Date:   Mon Sep 22 13:08:27 2014 -0400

    Fill out remaining fields in /proc/<pid>/stat

    The following fields were added from stat:

    rt_priority
    policy
    delayacct_blkio_ticks
    guest_time
    cguest_time

 src/pmdas/linux_proc/help       |    5 ++++
 src/pmdas/linux_proc/pmda.c     |   46 
+++++++++++++++++++++++++++++++++++++++
 src/pmdas/linux_proc/proc_pid.h |    7 +++++-
 src/pmdas/linux_proc/root_proc  |    5 ++++
 4 files changed, 62 insertions(+), 1 deletions(-)

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For most of the existing metrics from the stat file, there is 1-1 
correspondence between the item id and its position in the buffer that 
is read from proc.  But 3 existing metrics( ttyname, wchan_symbol, 
psargs) use ids that do not correspond to items in the buffer.  So for 
the metrics i added, I just started after these and coded in the 
appropriate offset in the fetch.  I assume messing with existing ids 
would break lots of existing archives, etc?
Also, I only needed delayacct_blkio_ticks for my purposes, but did the 
others just for completeness.  Slightly off topic, but am I 
understanding correctly that delayacct_blkio_ticks would be a measure of 
per process IO wait?
Thanks

Martins