Hugh Dickins wrote:
Yes, it's a good observation from Robin.
It'll have been spoiling the exit speedup we expected from your
2.6.14 copy_page_range "Don't copy [faultable] ptes" fork speedup.
Yep. Not to mention it is probably responsible for some of the
4 level page table performance slowdowns on x86-64.
I prefer your patch too. But I'm not very interested in temporary
speedups relative to 2.6.14. Attacking this is a job I'd put off
until after the page fault scalability changes, which make it much
easier to do a proper job.
Yeah definitely.
I wonder if we should go with Robin's fix (+/- my variation)
as a temporary measure for 2.6.15?
--
SUSE Labs, Novell Inc.
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