From: Hao Li Date: Fri, 3 Apr 2026 07:37:36 +0000 (+0800) Subject: slub: use N_NORMAL_MEMORY in can_free_to_pcs to handle remote frees X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=7f9bb84fdb5ee7621fcd6519cd14d3dc9aa75c5c;p=thirdparty%2Flinux.git slub: use N_NORMAL_MEMORY in can_free_to_pcs to handle remote frees Memory hotplug now keeps N_NORMAL_MEMORY up to date correctly, so make can_free_to_pcs() use it. As a result, when freeing objects on memoryless nodes, or on nodes that have memory but only in ZONE_MOVABLE, the objects can be freed to the sheaf instead of going through the slow path. Signed-off-by: Hao Li Acked-by: Harry Yoo (Oracle) Acked-by: David Rientjes Link: https://patch.msgid.link/20260403073958.8722-1-hao.li@linux.dev Signed-off-by: Vlastimil Babka (SUSE) --- diff --git a/mm/slub.c b/mm/slub.c index 492ef5927e58..f896cdb41383 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -6022,14 +6022,15 @@ static __always_inline bool can_free_to_pcs(struct slab *slab) goto check_pfmemalloc; /* - * Freed object isn't from this cpu's node, but that node is memoryless. + * Freed object isn't from this cpu's node, but that node is memoryless + * or only has ZONE_MOVABLE memory, which slab cannot allocate from. * Proceed as it's better to cache remote objects than falling back to * the slowpath for everything. The allocation side can never obtain * a local object anyway, if none exist. We don't have numa_mem_id() to * point to the closest node as we would on a proper memoryless node * setup. */ - if (unlikely(!node_state(numa_node, N_MEMORY))) + if (unlikely(!node_state(numa_node, N_NORMAL_MEMORY))) goto check_pfmemalloc; #endif