Re: [Xen-devel] xen/arm: Alternative start of day cache coherency

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Thu, 2014-01-23 at 14:56 +0000, Stefano Stabellini wrote:
> On Thu, 23 Jan 2014, Ian Campbell wrote:
> > On Thu, 2014-01-23 at 13:55 +0000, Stefano Stabellini wrote:
> > > At least if it was combined with the RAM scrub we would save the 2048
> > > map/unmap.
> > 
> > The scrub has to map it in exactly the same way.
> 
> Right, since we are already doing it once, why do it twice? :)

Because you need a load of other infrastructure (to track clean vs dirty
guest pages) too for it to be of any benefit.

Ian.


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