Messages in this thread | | | From | KOSAKI Motohiro <> | Date | Wed, 23 Jan 2013 16:45:12 -0500 | Subject | Re: [PATCH 5/6] mm: Fold page->_last_nid into page->flags where possible |
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> 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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