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Date:      Wed, 11 Dec 1996 15:15:21 -0800
From:      Mike Haertel <haertel@ichips.intel.com>
To:        freebsd-smp@freebsd.org
Subject:   some questions concerning TLB shootdowns in FreeBSD
Message-ID:  <9612112315.AA58904@pdxcs078.intel.com>
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I'm curious how/when people are doing TLB shootdowns.
Obviously when reducing permission or unmapping pages.
How about for manipulations of the dirty/accessed bits?
(Does FreeBSD use these?)

And how is the shootdown implemented?  One simple
method:

	interprocessor interrupt to everyone concerned
	everyone meets at barrier
	manipulate page tables
	everyone flushes appropriate TLB entries and resumes

Or is it done in some less conservative fashion?

Thanks,

	Mike
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