"should be". Sigh. Be nice to see an "is" one day ;)
> Per-node kswapd, being able to free mem pressure on one node
> easily (without cross-node bouncing), breakup of the lru list into
> smaller chunks, etc. These actually fix some of the biggest problems
> that we have right now and are hard to solve in other ways.
>
> The large rmap overheads we still have to kill seem to me to be the
> memory usage and the fork overhead. There's also a certain amount of
> overhead to managing any more data structures, of course. I think we
> know how to kill most of it. I don't think adding highpte_chain is
> the correct thing to do ... seems like adding insult to injury. I'd
> rather see us drive a silver stake through the problem's heart and
> kill it properly ...
Well that would be nice. And by extension, pte-highmem gets a stake
as well.
Do you think that large pages alone would be enough to allow us
to leave pte_chains (and page tables?) in ZONE_NORMAL, or would
shared pagetables also be needed?
Was it purely Oracle which drove pte-highmem, or do you think
that page table and pte_chain consumption could be a problem
on applications which can't/won't use large pages?
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