[PATCH 0 of 6] Xen: generalize and beautify scheduling related perfc and stats

[Dario Faggioli <dario.faggioli@citrix.com>]

Hello Everyone,

The main idea behind this series was to cleanup a bit the stats management
within the SEDF code in sched_sedf.c.  While looking into it, I thought the
best idea to achieve that was to generalize a little bit the stat and
perfcounter macros we have in credit, so that they could be used within the
other schedulers too.

That is then what these patches ended up doing.

It's definitely nothing urgent or particularly important now, but will help
if/when we decide to make a broader use of performance counters in the
scheduler code (and I really plan to do that for SEDF at some point! :-D).

Very few functional changes are introduced and no hunk is effective if the
hypervisor is not compiled with 'perfc=y'.

While at it, as I found out build is broken with 'perfc=y', the very first
patch in the series tries to fix that. Paul, as it seems it was you that
introduced those two counters, could you double check? (As it happens in
viridian.c and, for me, it could be like the first time or so I even hear the
word 'Viridian' ;-P.)

Thanks and Regards, Dario

-- 
<<This happens because I choose it to happen!>> (Raistlin Majere)
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Dario Faggioli, Ph.D, http://retis.sssup.it/people/faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)