Re: [Xen-devel] [PATCH V3] X86/vMCE: handle broken page with regard to migration

[Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>]

George Dunlap writes ("Re: [Xen-devel] [PATCH V3] X86/vMCE: handle broken page 
with regard to migration"):
> But on the whole, is that really that much *faster* to do it that way?  
> Either way you're still adding a single hypercall to the whole thing, 
> and one iteration of a loop for each page; but in Jinsong's patch, the 
> loop is done all at once, so presumably the compiler / processor will be 
> able to do make better use of loop unrolling / registers / the pipeline 
> / branch prediction / caches &c.
> 
> The only way to avoid the loop would be to add an extra "have any pages 
> been marked broken / dirty" bit somewhere, which is probably more 
> trouble than it's worth.

OK, that makes sense.

Ian.

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