Re: [RFC 4/4]x86: avoid tlbstate lock if no enough cpus

[Shaohua Li]

On Wed, 2010-11-03 at 15:12 +0800, Eric Dumazet wrote:
> Le mercredi 03 novembre 2010 Ã 15:06 +0800, Shaohua Li a Ãcrit :
> > just don't want to include the non-present cpus here. I wonder why we
> > haven't a variable to record online cpu number.
> 
> What prevents a 256 cpus machine, to have 8 online cpus that all use the
> same TLB vector ?
> 
> (Max 32 vectors, so 8 cpus share each vector, settled at boot time)
> 
> Forget about 'online', and think 'possible' ;)
Hmm, the spread vectors to node already merged, how could the 8 cpus
share a vector?

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