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Subject[PATCH 0/2]: Get perf counters working on D-cache aliasing cpus.

With Jen's Axboe's basic sparc counter patch in my tree I started
playing with it on sparc64. Turns out it won't work on anything

The issue is D-cache aliasing between the kernel side mapping
and the user side mapping of the perf event ring buffer.

The following two patches attempt to address this issue and
are working properly on my test machine.

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