Messages in this thread | | | Date | Wed, 25 Jul 2012 10:31:51 -0500 (CDT) | From | Christoph Lameter <> | Subject | Re: [RFC PATCH v2] SLUB: enhance slub to handle memory nodes without normal memory |
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On Wed, 25 Jul 2012, Jiang Liu wrote:
> > There is already a N_NORMAL_MEMORY node map that contains a list of node > > that have *normal* memory usable by slab allocators etc. I think the > > cleanest solution would be to clear the corresponding node bits for your > > special movable only zones. Then you wont be needing to modify other > > subsystems anymore. > > > Hi Chris, > Thanks for your comments! I have thought about the solution mentioned, > but seems it doesn't work. We have node masks for both N_NORMAL_MEMORY and > N_HIGH_MEMORY to distinguish between normal and highmem on platforms such as x86. > But we still don't have such a mechanism to distinguish between "normal" and "movable" > memory. So for memory nodes with only movable zones, we still set N_NORMAL_MEMORY for > them. One possible solution is to add a node mask for "N_NORMAL_OR_MOVABLE_MEMORY", > but haven't tried that yet. Will have a try for that.
Hmmm... Maybe add another N_LRU_MEMORY bitmask and replace those N_NORMAL_MEMORY uses with N_LRU_MEMORY as needed? Use N_NORMAL_MEMORY for subsystems that need to do regular (non LRU) allocations that are not movable? _
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