[PATCH 0/5] Optimize perf ring-buffer

[Peter Zijlstra]

This patch-set optimizes the perf ring-buffer by removing IRQ disable and 
all LOCK ops from the fast paths.

There's also an RFC patch that adds perf_output_addr() which will allow
you to write directly to the buffer, however I'm not sure how to go
about using it for the trace events since we need to multiplex event --
there is no single copy of the actual event.

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