[PATCHv2 0 of 1] Rework locking for sched_adjust.

[Dario Faggioli <raistlin@linux.it>]

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Hi everyone,

Here it is v2 of the lock reworking around and within sched-adjust.

With respect to the first posting [1]:
 - I _did_not_ move the per-pluggable scheduler lock toward schedule.c,
   as agreed with George during review;
 - I fixed the bug in sedf spotted by Juergen the way he suggested;
 - I've finally been able to test it under all the three schedulers, 
   and it is doing its job, at least here;

Notice the series "collapsed" in one signle patch, as it was being hard
to find a breakdown of it that does not introduce regressions and/or
transient deadlock situations worse than the ones it's trying to cure...
I hope it's still readable and comfortable to review. :-)

Thanks to everyone who provided his feedback on the first version of
this.

Regards,
Dario

[1] http://xen.1045712.n5.nabble.com/RFC-RFT-PATCH-0-of-3-rework-locking-in-sched-adjust-td5016899.html

--
 xen/common/sched_credit.c  |   10 ++++++--
 xen/common/sched_credit2.c |   21 ++++++++++---------
 xen/common/sched_sedf.c    |  156 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-----------------------------------
 xen/common/schedule.c      |   34 +-------------------------------
 4 files changed, 140 insertions(+), 81 deletions(-)

-- 
<<This happens because I choose it to happen!>> (Raistlin Majere)
-------------------------------------------------------------------
Dario Faggioli, http://retis.sssup.it/people/faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)
PhD Candidate, ReTiS Lab, Scuola Superiore Sant'Anna, Pisa (Italy)



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