Re: [PATCH part5 0/7] Arrange hotpluggable memory as ZONE_MOVABLE.

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On 08/13/2013 12:46 AM, Tejun Heo wrote:
......

* Adding an option to tell the kernel to try to stay away from
   hotpluggable nodes is fine.  I have no problem with that at all.

* The patchsets upto this point have been somehow trying to reorder
   operations shomehow such that *no* memory allocation happens before
   memblock is populated with hotplug information.

* However, we already *know* that the memory the kernel image is
   occupying won't be removeable.  It's highly likely that the amount
   of memory allocation before NUMA / hotplug information is fully
   populated is pretty small.  Also, it's highly likely that small
   amount of memory right after the kernel image is contained in the
   same NUMA node, so if we allocate memory close to the kernel image,
   it's likely that we don't contaminate hotpluggable node.  We're
   talking about few megs at most right after the kernel image.  I
   can't see how that would make any noticeable difference.

* Once hotplug information is available, allocation can happen as
   usual and the kernel can report the nodes which are actually
   hotpluggable - marked as hotpluggable by the firmware&&  didn't get
   contaminated during early alloc&&  didn't get overflow allocations
   afterwards.  Note that we need such mechanism no matter what as the
   kernel image can be loaded into hotpluggable nodes and reporting
   that to userland is the only thing the kernel can do for cases like
   that short of denying memory unplug on such nodes.


Hi tj, hpa, luck, yinghai,

So if all of you agree on the idea above from tj, I think
we can do it in this way. Will update the patches to allocate
memory near kernel image before SRAT is parsed.

Thanks.
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