perf: Report maximum values for counter overflow
authorBarret Rhoden <brho@cs.berkeley.edu>
Thu, 16 Jun 2016 19:34:45 +0000 (15:34 -0400)
committerBarret Rhoden <brho@cs.berkeley.edu>
Fri, 17 Jun 2016 16:17:55 +0000 (12:17 -0400)
The counters can overflow and wrap around.  Previously, if that happened,
we'd just report the wrapped value.  Now we'll report the maximum value.
Userspace (perf stat) can handle that if we'd like to.

Signed-off-by: Barret Rhoden <brho@cs.berkeley.edu>

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