[RFC][PATCH 0/3] variuos perf fixes

[Peter Zijlstra]

Hi,

Vince reported some fail here:

  lkml.kernel.org/r/alpine.DEB.2.20.1509021227380.32729@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

These patches are the result of me trying to fix it.

Compile tested only, I'll try them after a sleep..

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