Re: -mmX 4G patches feedback [numbers: how much performance impact]

[Andrea Arcangeli]

On Thu, Apr 08, 2004 at 04:42:37PM -0700, Martin J. Bligh wrote:
> but still not perfect. Hmm. I'll go think about it ;-)

nothing is perfect anyways ;), if you've an implementation it'd be very
interesting to see a result in the kernel compile with -j with mem=800m,
that should be close to a real life worst case. Then we'll see if the
setup after execve is slowed down measurably, it's hard to tell, but we
know there's a chance since you measure significant slowdown from
pte-highmem on very highmem machines with short lived tasks. btw, note that
if the task isn't short lived, good apps should flood with mmap either (at
least on 64bit ;)
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