Re: [PATCH part1 v6 4/6] x86/mem-hotplug: Support initialize page tables in bottom-up

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Hello,

On Thu, 2013-10-10 at 12:46 -0400, Tejun Heo wrote:
> On Thu, Oct 10, 2013 at 10:24:09AM -0600, Toshi Kani wrote:
> > > We're going round and round.  You're saying that using SRAT isn't
> > > worse than what came before while failing to illustrate how committing
> > > to invasive changes would eventually lead to something better.  "it
> > > isn't worse" isn't much of an argument.
> > 
> > We did avoid moving up the ACPI table init function per your suggestion.
> > I guess I do not understand why you still concerned about using SRAT...
> 
> As you wrote above, SRAT is not enough to support device granularity.
> We need to parse the device hierarchy too before setting up page
> tables and one of the previous arguments was "it's only SRAT".  It
> doesn't instill confidence when there doesn't seem to be much long
> term planning going on especially as the general quality of the
> patches isn't particularly high.  I find it difficult to believe that
> this effort as it currently stands is likely to reach full solution
> and as such it feels much safer to opt for a simpler, less dangerous
> approach for immedate use, for which either approach doesn't make much
> of difference.

Can you elaborate why we need to parse the device hierarchy before
setting up page tables?

Thanks,
-Toshi


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