Re: [PATCH 5/6] mm: Fold page->_last_nid into page->flags where possible

[KOSAKI Motohiro]

> Good question.
>
> There are 19 free bits in my configuration but it's related to
> CONFIG_NODES_SHIFT which is 9 for me (512 nodes) and very heavily affected
> by options such as CONFIG_SPARSEMEM_VMEMMAP. Memory hot-remove does not work
> with CONFIG_SPARSEMEM_VMEMMAP and enterprise distribution configs may be
> taking the performance hit to enable memory hot-remove. If I disable this
> option to enable memory hot-remove then there are 0 free bits in page->flags.

FWIW, when using current mmotm, memory hot memory remove does work w/
CONFIG_SPARSEMEM_VMEMMAP. Recently Fujitsu changed.
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