[RFC] sched: Consider higher or lower sched_class tasks on migration

[Byungchul Park]

Hello folks,

I found there's some problem on rt migration code while I was working
on a latency sensitive system.

I thought we need to consider not only tasks' priorty within the
sched_cass but also priorities between sched_classes on migration
at least for rt(or deadline) tasks.

Even though I worked against very low version of stable-tree (v4.4),
I will work on the newest mainline tree and re-submit it as a normal
patch (not RFC) if you agree with the approach.

BTW, am I misshing something on this?

Thanks,
Byungchul

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