On 07/18/2007 07:19 PM, Phillip Susi wrote:
Why do the two pages have to be physically contiguous? The stack just
needs to be two contiguous pages in virtual memory, but they can map to
any two pages anywhere in physical memory.
As far as I'm aware that's just a consequence of the way linux does memory
management. If we ignore highmem, virtual memory is simply +/- PAGE_OFFSET
away from physical so allocating virtually contiguous pages that are _not_
physically contiguous requires mapping them somewhere (the vmalloc area)
which is limited. Given that large number of threads _are_ the problem you
wouldn't solve things -- you'd again be out of space, although now for a
different reason.
Rene.
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