On Wed, Jun 27, 2012 at 2:15 PM, Peter Zijlstra <a.p.zijlstra@xxxxxxxxx> wrote:
> This originated from s390 which does something similar and would allow
> s390 to use the generic TLB flushing code.
>
> The idea is to flush the mm wide cache and tlb a priory and not bother
> with multiple flushes if the batching isn't large enough.
>
> This can be safely done since there cannot be any concurrency on this
> mm, its either after the process died (exit) or in the middle of
> execve where the thread switched to the new mm.
I think we actually *used* to do the final TLB flush from within the
context of the process that died. That doesn't seem to ever be the
case any more, but it does worry me a bit. Maybe a
VM_BUG_ON(current->active_mm == mm);
or something for the fullmm case?
Linus
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