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 94iRBfN7 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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