On Fri, 23 May 2014, Marcelo Tosatti wrote: > Zone specific allocations, such as GFP_DMA32, should not be restricted > to cpusets allowed node list: the zones which such allocations demand > might be contained in particular nodes outside the cpuset node list. > > The alternative would be to not perform such allocations from > applications which are cpuset restricted, which is unrealistic. > > Fixes KVM's alloc_page(gfp_mask=GFP_DMA32) with cpuset as explained.
Memory policies are only applied to a specific zone so this is not unprecedented. However, if a user wants to limit allocation to a specific node and there is no DMA memory there then may be that is a operator error? After all the application will be using memory from a node that the operator explicitly wanted not to be used. There is also the hardwall flag. I think its ok to allocate outside of the cpuset if that flag is not set. However, if it is set then any attempt to alloc outside of the cpuset should fail. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/