On Tue, Sep 27, 2016 at 07:12:31AM +1000, Benjamin Herrenschmidt wrote:
In any case, if the memory hasn't been hotplug, this shouldn't be necessary as we shouldn't be considering it for allocation.
Right. To be clear, the background info I put in the commit log refers to x86, where the SRAT can describe movable nodes which exist at boot. They're trying to avoid allocations from those nodes before they've been identified.
On power, movable nodes can only exist via hotplug, so that scenario can't happen. We can immediately go back to top-down allocation. That is the missing call being added in the patch.
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