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Date: Wed, 23 Mar 2005 11:19:38 +1100
From: Nick Piggin <nickpiggin@yahoo.com.au>
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To: "David S. Miller" <davem@davemloft.net>
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Subject: Re: [PATCH 1/5] freepgt: free_pgtables use vma list
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David S. Miller wrote:
> On Wed, 23 Mar 2005 10:32:10 +1100
> Nick Piggin <nickpiggin@yahoo.com.au> wrote:
> 
> 
>>I think David's on the right track - I think there's something a
>>bit wrong at the top. In my reply to Andrew in this thread I
>>posted a patch which may at least get things working...
> 
> 
> We have to do the "if (ceiling)" check in every spot where
> we mask it in some way, and if it falls to zero from non-zero
> due to the masking, we skip.
> 
> That gives me a mostly working kernel.
> 

I see. Tricky.

> Bad news is that while lat_proc's fork and exec tests improve
> dramatically, shell performance is way down on sparc64.
> I'll post before and after numbers in a bit.  Note, this is
> just with Hugh's base patch plus bug fixes.
> 

That's interesting. The only "extra" stuff Hugh's should be
doing is the vma traversal.

The single walk patch seems to fit in quite well with Hugh's
updated patchset. I haven't quite worked out how to best do
hugepages, but it is easily possible. But I won't dust that
off again until Hugh's is nicely tested and working.