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Subject[PATCH 0/9] perf_counter patches
This set fixes 2 problems I found while going over the perf_counter code.
- the delayed wakeups were incomplete (and broken on x86)
- update_userpage() wasn't used properly

It also adds tracking of the mmap() data so that we can profile userspace.

I also folded in Paulus' pending patches (I had to fix up a few conflict,
please double check).

Finally, the writable control page patch... still not convinced we need that.
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