Messages in this thread | | | Date | Sat, 10 Aug 2002 16:55:45 -0300 (BRT) | From | Rik van Riel <> | Subject | Re: large page patch (fwd) (fwd) |
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On 10 Aug 2002, Eric W. Biederman wrote: > Andrew Morton <akpm@zip.com.au> writes: > > > > The other worry is the ZONE_NORMAL space consumption of pte_chains. > > We've halved that, but it will still make high sharing levels > > unfeasible on the big ia32 machines.
> There is a second method to address this. Pages can be swapped out > of the page tables and still remain in the page cache, the virtual > scan does this all of the time. This should allow for arbitrary > amounts of sharing. There is some overhead, in faulting the pages > back in but it is much better than cases that do not work. A simple > implementation would have a maximum pte_chain length.
Indeed. We need this same thing for page tables too, otherwise a high sharing situation can easily "require" more page table memory than the total amount of physical memory in the system ;)
regards,
Rik -- Bravely reimplemented by the knights who say "NIH".
http://www.surriel.com/ http://distro.conectiva.com/
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