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SubjectRe: Per-Processor Data Paget

> clone()ing costs go up immediately, from the current 10 usecs cost to
> create a process to 50-100 usecs, plus MM handling gets more complicated.
> Plus in PAE mode this would be even more complicated (because two levels
> need to be private to the thread). [...]

plus a full TLB flush has to be done if we context-switch between threads
that share the same address-space...

-- mingo

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