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On Wed, Mar 11, 2026 at 09:25:57AM +0100, Vlastimil Babka (SUSE) wrote: > On memoryless nodes we can now allocate from cpu sheaves and refill them > normally. But when a node is memoryless on a system without actual > CONFIG_HAVE_MEMORYLESS_NODES support, freeing always uses the slowpath > because all objects appear as remote. We could instead benefit from the > freeing fastpath, because the allocations can't obtain local objects > anyway if the node is memoryless. > > Thus adapt the locality check when freeing, and move them to an inline > function can_free_to_pcs() for a single shared implementation. > > On configurations with CONFIG_HAVE_MEMORYLESS_NODES=y continue using > numa_mem_id() so the percpu sheaves and barn on a memoryless node will > contain mostly objects from the closest memory node (returned by > numa_mem_id()). No change is thus intended for such configuration. > > On systems with CONFIG_HAVE_MEMORYLESS_NODES=n use numa_node_id() (the > cpu's node) since numa_mem_id() just aliases it anyway. But if we are > freeing on a memoryless node, allow the freeing to use percpu sheaves > for objects from any node, since they are all remote anyway. > > This way we avoid the slowpath and get more performant freeing. > The potential downside is that allocations will obtain objects with a larger > average distance. If we kept bypassing the sheaves on freeing, a refill > of sheaves from slabs would tend to get closer objects thanks to the > ordering of the zonelist. When I think about ways to avoid this, the right solution is to implement HAVE_MEMORYLESS_NODES :) > Architectures that allow de-facto memoryless > nodes without proper CONFIG_HAVE_MEMORYLESS_NODES support should perhaps > consider adding such support. Exactly! > Signed-off-by: Vlastimil Babka (SUSE) > --- Looks good to me, Reviewed-by: Harry Yoo -- Cheers, Harry / Hyeonggon