Date: Mon, 26 Jul 2010 08:24:44 -0600 (MDT) From: "M. Warner Losh" <imp@bsdimp.com> To: alc@cs.rice.edu Cc: mips@FreeBSD.org Subject: Re: svn commit: r210460 - head/sys/mips/include Message-ID: <20100726.082444.792475653697373753.imp@bsdimp.com> In-Reply-To: <4C4D3AC1.8080201@cs.rice.edu> References: <AANLkTik%2BBV6u6fNVX8Ntb-G1yF=vEDh6VqB7Xcb5VtD-@mail.gmail.com> <20100725.052629.160100930644600654.imp@bsdimp.com> <4C4D3AC1.8080201@cs.rice.edu>
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In message: <4C4D3AC1.8080201@cs.rice.edu> Alan Cox <alc@cs.rice.edu> writes: : M. Warner Losh wrote: : > In message: : > <AANLkTik+BV6u6fNVX8Ntb-G1yF=vEDh6VqB7Xcb5VtD-@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: : > : >> Get N64 building by defining VM_FREELIST_DIRECT to be : > : >> VM_FREELIST_DEFAULT. I believe this is correct, since KX is set : > in : > : >> n64, 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? : > : : As long as n64 has a single free list, there is no point in changing : pmap_alloc_pte_page() to use vm_page_alloc(). There may, however, be : some point to using VM_WAIT in pmap_grow_pte_page_cache(), because : vm_contig_grow_cache() is far more aggressive about paging out dirty : pages than VM_WAIT is, and VM_WAIT would suffice. : : For what it's worth, fixing pmap_change_wiring() and : pmap_page_wired_mappings() is almost certainly more important. what's broken with them now? Warner
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