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If CPU stays in the same idle state for the full duration of xenpm sample then average residency may not be reported correctly since usage counter will not be incremented. In addition, in order to calculate averages correctly residence time and usage counter should be read and written atomically. Signed-off-by: Boris Ostrovsky <boris.ostrovsky@amd.com> Committed-by: Keir Fraser <keir@xen.org>