tree 02845a28bbbddb255d3e2c09b281d7f1f1213563
parent 98112d2e957e0d348f06d8a40f2f720204a70b55
author Robert Richter <robert.richter@amd.com> 1333390754 +0200
committer Ingo Molnar <mingo@kernel.org> 1336569795 +0200

perf/x86-ibs: Trigger overflow if remaining period is too small

There are cases where the remaining period is smaller than the minimal
possible value. In this case the counter is restarted with the minimal
period. This is of no use as the interrupt handler will trigger
immediately again and most likely hits itself. This biases the
results.

So, if the remaining period is within the min range, we better do not
restart the counter and instead trigger the overflow.

Signed-off-by: Robert Richter <robert.richter@amd.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1333390758-10893-9-git-send-email-robert.richter@amd.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>