Fixes for node alignment and flatmem assumptions
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b4 am 20060519134241.29021.84756.sendpatchset@skynetVersions newest first
- v1 Latest2 patches 4 repliesIn review
Patches in v1 No applies recorded yet
| # | Subject and files | Size | Replies | Applied |
|---|---|---|---|---|
| 1/2 | Align the node_mem_map endpoints to a MAX_ORDER boundaryinclude/ mm/ | +12 | 4 replies | |
| 2/2 | FLATMEM relax requirement for memory to start at pfn 0mm/ | +13 | 0 replies |
Reviews trailers per patch
All 2 patches have a Reviewed-by or Acked-by.
| Patch | Mel Gorman |
|---|---|
| 1/2 | A-b |
| 2/2 | A-b |
Trailers given in replies are filled; those carried in the patches from earlier versions are outlined with dashes.
Cover letter [PATCH 0/2] Fixes for node alignment and flatmem assumptions
After almost 3 days of banging the head on the keyboard, it was discovered why arch-independent zone-sizing failed on IA64 for the configuration posted on http://www.zip.com.au/~akpm/linux/patches/stuff/config-ia64 .
The two patches in this set address the following;
1. The buddy allocator requires that the node_mem_map be aligned on a MAX_ORDER boundary. Patch 1 from Bob Picco's patch aligns the node_map_map correctly.
2. This is the one that was giving me keyboard face. The FLATMEM memory model assumes that
mem_map[0] == NODE_DATA(0)->node_mem_map == PFN 0
This is not the case on IA64 with arch-independent zone sizing because NODE_DATA(0)->node_mem_map starts where the first valid page frame is. On my test machine, that is PFN 1025 but it probably varies. Patch 2 from Andy Whitcroft relaxes the assumption that NODE_DATA(0)->node_mem_map == PFN 0 .
These patches apply to 2.6.17-rc4-mm1 and are independent of architecture-independent zone sizing. Patch 1 in particular fixes a real problem that is just difficult to trigger. However, once applied, have-ia64-use-add_active_range-and-free_area_init_nodes.patch will work again.
2.6.17-rc4-mm1 with this patchset have been boot-tested by me and verified that /proc/zoneinfo is ok on x86, ppc64, x86_64 and ia64 in a variety of configurations. Bob Picco also says that both patches passed a test with mem=750M and 4Gb on a rx2600 (ia64) with large memory holes. They have also been successfully tested with have-ia64-use-add_active_range-and-free_area_init_nodes.patch added back in.
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-- Mel Gorman Part-time Phd Student Linux Technology Center University of Limerick IBM Dublin Software Lab -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to [email protected]. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"[email protected]"> [email protected] </a>