On 4/4/24 9:12 PM, Christoph Lameter (Ampere) wrote: > On Tue, 2 Apr 2024, Ming Yang wrote: > >> The key point of above allocation flow is: the slab should be alloced >> from the partial of other node first, instead of the buddy system of >> other node directly. > > > If you use GFP_THISNODE then you will trigger a reclaim pass on the remote > node. That could generate a performance regression. Note the alternative approach I merged doesn't have this issue because it uses GFP_NOWAIT for that __GFP_THISNODE attempt. https://lore.kernel.org/all/20240330082335.29710-1-chenjun102@xxxxxxxxxx/ > We already support this kind of behavior via the node_reclaim / > zone_reclaiom setting in procfs. Please use that. > > The remote buildup of the partial pages can be addressed by changing the > remote_node_defrag_ratio in the slabs. This will make slub scan remote > nodes for partial slabs before going into the page allocator. > >
