tree 3774a7b43cb513761924209f5d51b1a497fcd3d2
parent 7bf352384fda3f678a283928c6c5b2cd9da877e4
author Robert Richter <robert.richter@amd.com> 1333390750 +0200
committer Ingo Molnar <mingo@kernel.org> 1336569793 +0200

perf/x86-ibs: Fix frequency profiling

Fixing profiling at a fixed frequency, in this case the freq value and
sample period was setup incorrectly. Since sampling periods are
adjusted we also allow periods that have lower 4 bits set.

Another fix is the setup of the hw counter: If we modify
hwc->sample_period, we also need to update hwc->last_period and
hwc->period_left.

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/1333390758-10893-5-git-send-email-robert.richter@amd.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>