[Bug 137246] [kqueue] kevents not generated for file writes through mmaped areas

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=137246

--- Comment #3 from Konstantin Belousov <kib at FreeBSD.org> ---
The write event should fire when syncer flushes dirty pages to the backing
file.  This occurs periodically once in 30-60 secs.  The only exception is
tmpfs.

Of course we cannot ignite the NOTE_WRITE when userspace dirties the page,
because it would cause extremely high overhead.

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