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From: Stephan Uphoff <ups@tree.com>
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Date: Thu, 09 Sep 2004 12:46:55 -0400
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Subject: Re: kern/71509: sched_pin ignored by sched_4bsd
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sched_pin() is used by the i386 pmap to optimize TLB invalidation in SMP
systems by limiting it to a single processor.
Ignoring the thread pin count can cause a thread to migrate to another
CPU where obsolete cached TLB entries may point to the wrong physical
page. This could for example cause pmap_copy_page to copy to/from the
wrong page.