From owner-freebsd-hackers@FreeBSD.ORG  Wed Jul 29 00:34:01 2009
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Date: Tue, 28 Jul 2009 17:33:59 -0700
From: Yuri <yuri@rawbw.com>
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Subject: How to profile the disk io performed through mmaps?
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I have a file mmapped to memory area and partially modified this way.

Is there a way to know what are the actual disk writes/reads done on the 
file in this scenario?
Would kqueue events on file's vnode be triggered for mmapped writes?

Yuri