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To: Bruce Evans <bde@zeta.org.au>
cc: CVS-commiters@freefall.freebsd.org, cvs-sys@freefall.freebsd.org
Subject: Re: cvs commit: src/sys/vm vm_glue.c vm_map.c vm_page.c vm_pageout.c 
In-reply-to: Your message of "Mon, 23 Oct 95 16:53:05 +1000."
             <199510230653.QAA16504@godzilla.zeta.org.au> 
From: David Greenman <davidg@Root.COM>
Reply-To: davidg@Root.COM
Date: Mon, 23 Oct 1995 00:05:28 -0700
Sender: owner-commit@FreeBSD.org
Precedence: bulk

>>  Modified:    sys/vm    vm_glue.c vm_map.c vm_page.c vm_pageout.c
>>  Log:
>>  Get rid of machine-dependent NBPG and replace with PAGE_SIZE.
>
>What is the relationship between NBPG, PAGE_SIZE and CLBYTES?  I
>Surely there should only be one "machine-independent" "page" size.

   NBPG _should_ refer to the hardware page size. PAGE_SIZE should refer to
the "software" page size - the size that the independant portion of the VM
system uses. CLBYTES is a historical thing that should probably go away.
   NBPG should probably only be used in the machine-dependant portion of the
sources on architectures where NBPG != PAGE_SIZE...in the case of the i386, I
personally would prefer that PAGE_SIZE be used everywhere - especially when
it's not clear what is 'managed' by the higher VM system layer.

-DG