Date: Fri, 19 Mar 2010 17:48:54 +0530 From: "C. Jayachandran" <c.jayachandran@gmail.com> To: Neel Natu <neelnatu@gmail.com> Cc: freebsd-mips@freebsd.org Subject: Re: PATCH: enable use of memory beyond kseg0 Message-ID: <98a59be81003190518h32b118d3t79927954c92f933a@mail.gmail.com> In-Reply-To: <dffe84831003151835n496ca074ke72f29a0d2891d76@mail.gmail.com> References: <dffe84831003151835n496ca074ke72f29a0d2891d76@mail.gmail.com>
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On Tue, Mar 16, 2010 at 7:05 AM, Neel Natu <neelnatu@gmail.com> wrote: > This patch enables use of physical memory that is beyond the direct > mapped kseg0 region. > > The basic idea is to use KVA from the kseg2 region for mapping page > table pages that lie beyond the direct mapped region. > > The TLB miss handler can now recursively fault into the TLB invalid > handler if it dereferences a kseg2 page table page address that is not > in the TLB. The TLB invalid handler had to be extensively modified but > in the end came out much cleaner. > > I have tested this on a uni and multi-processor Sibyte with 1GB of > memory. It would be useful if this patch had some independent testing > as well. > > Please review. > > http://people.freebsd.org/~neel/mips_beyond_kseg.diff This fixes the crash I was seeing during 'make -j16 buildworld' on XLR. The buildworld completed after running about 6 hours over NFS mounted src and obj dir, so the patch looks good. I haven't done any performance comparisons yet. JC.
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