Re: [Xen-ia64-devel] [PATCH] add the definition of __cacheline_aligned and its variants (was Re: [PATCH] allow vcpu to move between pcpus)

[Tristan Gingold <Tristan.Gingold@xxxxxxxx>]

Le Lundi 03 Juillet 2006 15:00, Isaku Yamahata a écrit :
> On Mon, Jul 03, 2006 at 02:45:08PM +0200, Tristan Gingold wrote:
> > Why not adding the 'int last_cpu' field in the struct arch_vcpu ?
> > If two vcpus are running on the same cpu, the VHPT is always up to date.
>
> Since there is no gurantee that both two vcpu map
> (rid, virtual address) to a same pseudo physical address,
> VHPT and mTLB must be flushed everytime vcpu is switched.
> If they aren't flushed, it is highly likey that the per cpu variable
> area will be broken.
You are correct about percpu area.

Tristan.


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