[patch 0/2] Fix interactivity buglet with autogroup and shares distribution re-write

[Paul Turner]

This should address the interactivity issues reported by Mike Galbraith:
https://lkml.org/lkml/2010/11/28/47

The root cause turns out to be a mis-ordering of weight updates and accounting
outstanding execution time.

This is fixed by making update_curr() 'atomic' once more with respect to
accounting, this allows us to then make sure any outstanding time is charged in
the re-weight path (prior to the actual update).

Thank-you to everyone for their patience while we tracked this down,

- Paul


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