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radix-tree: Store a pointer to the root in each node

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Instead of having this mysterious private_data in each radix_tree_node,
store a pointer to the root, which can be useful for debugging.  This also
relieves the mm code from the duty of updating it.

Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>
This commit is contained in:
Matthew Wilcox 2017-01-16 17:10:21 -05:00
parent 1293d5c5f5
commit d58275bc96
3 changed files with 11 additions and 11 deletions
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2
include/linux/radix-tree.h
View File

@ -96,7 +96,7 @@ struct radix_tree_node {
unsigned char count; /* Total entry count */
unsigned char exceptional; /* Exceptional entry count */
struct radix_tree_node *parent; /* Used when ascending tree */
void *private_data; /* For tree user */
struct radix_tree_root *root; /* The tree we belong to */
union {
struct list_head private_list; /* For tree user */
struct rcu_head rcu_head; /* Used when freeing node */

14
lib/radix-tree.c
View File

@ -374,6 +374,7 @@ static void ida_dump(struct ida *ida)
*/
static struct radix_tree_node *
radix_tree_node_alloc(gfp_t gfp_mask, struct radix_tree_node *parent,
struct radix_tree_root *root,
unsigned int shift, unsigned int offset,
unsigned int count, unsigned int exceptional)
{
@ -419,11 +420,12 @@ radix_tree_node_alloc(gfp_t gfp_mask, struct radix_tree_node *parent,
out:
BUG_ON(radix_tree_is_internal_node(ret));
if (ret) {
ret->parent = parent;
ret->shift = shift;
ret->offset = offset;
ret->count = count;
ret->exceptional = exceptional;
ret->parent = parent;
ret->root = root;
}
return ret;
}
@ -631,7 +633,7 @@ static int radix_tree_extend(struct radix_tree_root *root, gfp_t gfp,
do {
struct radix_tree_node *node = radix_tree_node_alloc(gfp, NULL,
shift, 0, 1, 0);
root, shift, 0, 1, 0);
if (!node)
return -ENOMEM;
@ -828,7 +830,7 @@ int __radix_tree_create(struct radix_tree_root *root, unsigned long index,
shift -= RADIX_TREE_MAP_SHIFT;
if (child == NULL) {
/* Have to add a child node. */
child = radix_tree_node_alloc(gfp, node, shift,
child = radix_tree_node_alloc(gfp, node, root, shift,
offset, 0, 0);
if (!child)
return -ENOMEM;
@ -1330,7 +1332,7 @@ int radix_tree_split(struct radix_tree_root *root, unsigned long index,
for (;;) {
if (node->shift > order) {
child = radix_tree_node_alloc(gfp, node,
child = radix_tree_node_alloc(gfp, node, root,
node->shift - RADIX_TREE_MAP_SHIFT,
offset, 0, 0);
if (!child)
@ -2152,8 +2154,8 @@ void **idr_get_free(struct radix_tree_root *root,
shift -= RADIX_TREE_MAP_SHIFT;
if (child == NULL) {
/* Have to add a child node. */
child = radix_tree_node_alloc(gfp, node, shift, offset,
0, 0);
child = radix_tree_node_alloc(gfp, node, root, shift,
offset, 0, 0);
if (!child)
return ERR_PTR(-ENOMEM);
all_tag_set(child, IDR_FREE);

6
mm/workingset.c
View File

@ -354,10 +354,8 @@ void workingset_update_node(struct radix_tree_node *node, void *private)
* as node->private_list is protected by &mapping->tree_lock.
*/
if (node->count && node->count == node->exceptional) {
if (list_empty(&node->private_list)) {
node->private_data = mapping;
if (list_empty(&node->private_list))
list_lru_add(&shadow_nodes, &node->private_list);
}
} else {
if (!list_empty(&node->private_list))
list_lru_del(&shadow_nodes, &node->private_list);
@ -435,7 +433,7 @@ static enum lru_status shadow_lru_isolate(struct list_head *item,
*/
node = container_of(item, struct radix_tree_node, private_list);
mapping = node->private_data;
mapping = container_of(node->root, struct address_space, page_tree);
/* Coming from the list, invert the lock order */
if (!spin_trylock(&mapping->tree_lock)) {