From owner-freebsd-mips@FreeBSD.ORG  Sun Jul 25 11:30:51 2010
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To: c.jayachandran@gmail.com
From: "M. Warner Losh" <imp@bsdimp.com>
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Cc: mips@freebsd.org, alc@cs.rice.edu
Subject: Re: svn commit: r210460 - head/sys/mips/include
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In message: <AANLkTik+BV6u6fNVX8Ntb-G1yF=3DvEDh6VqB7Xcb5VtD-@mail.gmail=
.com>
            "Jayachandran C." <c.jayachandran@gmail.com> writes:
: On Sun, Jul 25, 2010 at 10:18 AM, Alan Cox <alc@cs.rice.edu> wrote:
: > Warner Losh wrote:
: >>
: >> Author: imp
: >> Date: Sun Jul 25 04:19:05 2010
: >> New Revision: 210460
: >> URL: http://svn.freebsd.org/changeset/base/210460
: >>
: >> Log:
: >> =A0Get N64 building by defining VM_FREELIST_DIRECT to be
: >> =A0VM_FREELIST_DEFAULT. =A0I believe this is correct, since KX is =
set in
: >> =A0n64, and thus all RAM can be direct mapped.
: =

: Thanks, this is something I missed in my MIPS page table changes.
: =

: >
: > Yes, it is.
: =

: In MIPS 64bit, whole physical memory is direct mapped thru a XKPHYS
: region. We can use vm_page_alloc() for pmap_alloc_pte_page() and
: VM_WAIT for pmap_grow_pte_page_cache(), is this something we should
: consider?

Likely.  Any idea what kind of performance difference this would buy
us?

Warner