Timur Tabi wrote,
>Any limit would have to be very high - definitely more than just half.
What if the
>application needs to pin 2GB? The customer is not going to buy 4+ GB of
RAM just
>because
>Linux doesn't like pinning more than half. In an x86-32 system, that would
required >PAE
>support and slow everything down.
>Off the top of my head, I'd say Linux would need to allow all but 512MB to
be pinned. >So
>you have 3GB of RAM, Linux should allow you to pin 2.5GB.
That is why we made it tunable, so that people could decide how to allow.
There is probably a better way to do it than some hard limit, but
that would take a little more understanding of the VM system than we had,
and that is why some of the core kernel folks maybe able to help us come up
with a better solution.
woody
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