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Keep track of the hardware counter more aggressively while interrupts

Description

Keep track of the hardware counter more aggressively while interrupts
are enabled. This should help to reduce cases where the hardware
counter reference jumps by large amounts.

MFC after: 3 days

Details

Provenance
Robert Noland <rnoland@FreeBSD.org>Authored on Jun 25 2009, 3:47 PM
Parents
rGa429bdf087d2: Fix one use of atomic for refcount missed in last commit.
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