@@ -1613,6 +1613,17 @@ static int radix_tree_cpu_dead(unsigned int cpu)
return 0;
}
+extern void xa_object_migrate(void *tree_node, int numa_node);
+
+static void radix_tree_migrate(struct kmem_cache *s, void **objects, int nr,
+ int node, void *private)
+{
+ int i;
+
+ for (i = 0; i < nr; i++)
+ xa_object_migrate(objects[i], node);
+}
+
void __init radix_tree_init(void)
{
int ret;
@@ -1627,4 +1638,6 @@ void __init radix_tree_init(void)
ret = cpuhp_setup_state_nocalls(CPUHP_RADIX_DEAD, "lib/radix:dead",
NULL, radix_tree_cpu_dead);
WARN_ON(ret < 0);
+ kmem_cache_setup_mobility(radix_tree_node_cachep, NULL,
+ radix_tree_migrate);
}
@@ -1971,6 +1971,55 @@ void xa_destroy(struct xarray *xa)
}
EXPORT_SYMBOL(xa_destroy);
+void xa_object_migrate(struct xa_node *node, int numa_node)
+{
+ struct xarray *xa = READ_ONCE(node->array);
+ void __rcu **slot;
+ struct xa_node *new_node;
+ int i;
+
+ /* Freed or not yet in tree then skip */
+ if (!xa || xa == XA_RCU_FREE)
+ return;
+
+ new_node = kmem_cache_alloc_node(radix_tree_node_cachep,
+ GFP_KERNEL, numa_node);
+ if (!new_node)
+ return;
+
+ xa_lock_irq(xa);
+
+ /* Check again..... */
+ if (xa != node->array) {
+ node = new_node;
+ goto unlock;
+ }
+
+ memcpy(new_node, node, sizeof(struct xa_node));
+
+ if (list_empty(&node->private_list))
+ INIT_LIST_HEAD(&new_node->private_list);
+ else
+ list_replace(&node->private_list, &new_node->private_list);
+
+ for (i = 0; i < XA_CHUNK_SIZE; i++) {
+ void *x = xa_entry_locked(xa, new_node, i);
+
+ if (xa_is_node(x))
+ rcu_assign_pointer(xa_to_node(x)->parent, new_node);
+ }
+ if (!new_node->parent)
+ slot = &xa->xa_head;
+ else
+ slot = &xa_parent_locked(xa, new_node)->slots[new_node->offset];
+ rcu_assign_pointer(*slot, xa_mk_node(new_node));
+
+unlock:
+ xa_unlock_irq(xa);
+ xa_node_free(node);
+ rcu_barrier();
+}
+
#ifdef XA_DEBUG
void xa_dump_node(const struct xa_node *node)
{
Implement functions to migrate objects. This is based on initial code by Matthew Wilcox and was modified to work with slab object migration. This patch can not be merged until all radix tree & IDR users are converted to the XArray because xa_nodes and radix tree nodes share the same slab cache (thanks Matthew). Co-developed-by: Christoph Lameter <cl@linux.com> Signed-off-by: Tobin C. Harding <tobin@kernel.org> --- lib/radix-tree.c | 13 +++++++++++++ lib/xarray.c | 49 ++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 62 insertions(+)