SPARSEMEM: pfn_to_nid implementation v2
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| # | Subject and files | Size | Replies | Applied |
|---|---|---|---|---|
| 1/2 | flatmem split out memory modelinclude/ | +6 | 0 replies | |
| 2/2 | sparse provide pfn_to_nidinclude/ | +5 | 0 replies |
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Cover letter [PATCH 0/2] SPARSEMEM: pfn_to_nid implementation v2
There are three places we define pfn_to_nid(). Two in linux/mmzone.h and one in asm/mmzone.h. These in essence represent the three memory models. The definition in linux/mmzone.h under !NEED_MULTIPLE_NODES is both the FLATMEM definition and the optimisation for single NUMA nodes; the one under SPARSEMEM is the NUMA sparsemem one; the one in asm/mmzone.h under DISCONTIGMEM is the discontigmem one. This is not in the least bit obvious, particularly the connection between the non-NUMA optimisations and the memory models.
Following in the email are two patches:
flatmem-split-out-memory-model: simplifies the selection of
pfn_to_nid() implementations. The selection is based primarily off the memory model selected. Optimisations for non-NUMA are applied where needed.
sparse-provide-pfn_to_nid: implement pfn_to_nid() for SPARSEMEM
Boot tested on for both SPARSEMEM and DISCONTIGMEM on all my test boxes. Also compile tested for FLATMEM and SPARSEMEM without NUMA. Against 2.6.15-rc2.
Next I'll review the configuration options to see if we can simplify them any.
-apw
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