#include <inttypes.h>
#include <urcu/rculfhash.h>
+/*
+ * Number of least significant pointer bits reserved to represent the
+ * child type.
+ */
+#define JA_TYPE_BITS 3
+#define JA_TYPE_MAX_NR (1UL << JA_TYPE_BITS)
+#define JA_TYPE_MASK (JA_TYPE_MAX_NR - 1)
+#define JA_PTR_MASK (~JA_TYPE_MASK)
+
+#define JA_ENTRY_PER_NODE 256UL
+#define JA_LOG2_BITS_PER_BYTE 3U
+#define JA_BITS_PER_BYTE (1U << JA_LOG2_BITS_PER_BYTE)
+
+#define JA_MAX_DEPTH 9 /* Maximum depth, including leafs */
+
+/*
+ * Entry for NULL node is at index 8 of the table. It is never encoded
+ * in flags.
+ */
+#define NODE_INDEX_NULL 8
+
+/*
+ * Number of removals needed on a fallback node before we try to shrink
+ * it.
+ */
+#define JA_FALLBACK_REMOVAL_COUNT 8
+
/* Never declared. Opaque type used to store flagged node pointers. */
struct cds_ja_inode_flag;
+struct cds_ja_inode;
/*
* Shadow node contains mutex and call_rcu head associated with a node.
*/
struct cds_ja_shadow_node {
struct cds_lfht_node ht_node; /* hash table node */
- struct cds_ja_inode *node; /* reverse mapping and hash table key */
+ struct cds_ja_inode_flag *node_flag; /* reverse mapping and hash table key */
/*
* mutual exclusion on all nodes belonging to the same tree
* position (e.g. both nodes before and after recompaction
pthread_mutex_t *lock;
unsigned int nr_child; /* number of children in node */
struct rcu_head head; /* for deferred node and shadow node reclaim */
- int is_root; /* is it a root node ? */
int fallback_removal_count; /* removals left keeping fallback */
+ int level; /* level in the tree */
+ struct cds_ja *ja; /* toplevel judy array */
};
struct cds_ja {
unsigned long nr_fallback; /* Number of fallback nodes used */
};
+static inline
+struct cds_ja_inode_flag *ja_node_flag(struct cds_ja_inode *node,
+ unsigned long type)
+{
+ assert(type < (1UL << JA_TYPE_BITS));
+ return (struct cds_ja_inode_flag *) (((unsigned long) node) | type);
+}
+
+static inline
+struct cds_ja_inode *ja_node_ptr(struct cds_ja_inode_flag *node)
+{
+ return (struct cds_ja_inode *) (((unsigned long) node) & JA_PTR_MASK);
+}
+
+static inline
+unsigned long ja_node_type(struct cds_ja_inode_flag *node)
+{
+ unsigned long type;
+
+ if (ja_node_ptr(node) == NULL) {
+ return NODE_INDEX_NULL;
+ }
+ type = (unsigned int) ((unsigned long) node & JA_TYPE_MASK);
+ assert(type < (1UL << JA_TYPE_BITS));
+ return type;
+}
+
+__attribute__((visibility("protected")))
+void rcuja_free_all_children(struct cds_ja_shadow_node *shadow_node,
+ struct cds_ja_inode_flag *node_flag,
+ void (*free_node_cb)(struct rcu_head *head));
+
__attribute__((visibility("protected")))
struct cds_ja_shadow_node *rcuja_shadow_lookup_lock(struct cds_lfht *ht,
- struct cds_ja_inode *node);
+ struct cds_ja_inode_flag *node_flag);
__attribute__((visibility("protected")))
void rcuja_shadow_unlock(struct cds_ja_shadow_node *shadow_node);
__attribute__((visibility("protected")))
struct cds_ja_shadow_node *rcuja_shadow_set(struct cds_lfht *ht,
- struct cds_ja_inode *new_node,
- struct cds_ja_shadow_node *inherit_from);
+ struct cds_ja_inode_flag *new_node_flag,
+ struct cds_ja_shadow_node *inherit_from,
+ struct cds_ja *ja);
/* rcuja_shadow_clear flags */
enum {
__attribute__((visibility("protected")))
int rcuja_shadow_clear(struct cds_lfht *ht,
- struct cds_ja_inode *node,
+ struct cds_ja_inode_flag *node_flag,
struct cds_ja_shadow_node *shadow_node,
unsigned int flags);
__attribute__((visibility("protected")))
void rcuja_shadow_prune(struct cds_lfht *ht,
- unsigned int flags);
+ unsigned int flags,
+ void (*free_node_cb)(struct rcu_head *head));
__attribute__((visibility("protected")))
struct cds_lfht *rcuja_create_ht(const struct rcu_flavor_struct *flavor);
struct cds_ja_shadow_node *shadow =
caa_container_of(node, struct cds_ja_shadow_node, ht_node);
- return (key == shadow->node);
+ return (key == shadow->node_flag);
}
__attribute__((visibility("protected")))
struct cds_ja_shadow_node *rcuja_shadow_lookup_lock(struct cds_lfht *ht,
- struct cds_ja_inode *node)
+ struct cds_ja_inode_flag *node_flag)
{
struct cds_lfht_iter iter;
struct cds_lfht_node *lookup_node;
flavor = cds_lfht_rcu_flavor(ht);
flavor->read_lock();
- cds_lfht_lookup(ht, hash_pointer(node, hash_seed),
- match_pointer, node, &iter);
+ cds_lfht_lookup(ht, hash_pointer(node_flag, hash_seed),
+ match_pointer, node_flag, &iter);
lookup_node = cds_lfht_iter_get_node(&iter);
if (!lookup_node) {
__attribute__((visibility("protected")))
struct cds_ja_shadow_node *rcuja_shadow_set(struct cds_lfht *ht,
- struct cds_ja_inode *new_node,
- struct cds_ja_shadow_node *inherit_from)
+ struct cds_ja_inode_flag *new_node_flag,
+ struct cds_ja_shadow_node *inherit_from,
+ struct cds_ja *ja)
{
struct cds_ja_shadow_node *shadow_node;
struct cds_lfht_node *ret_node;
if (!shadow_node)
return NULL;
- shadow_node->node = new_node;
+ shadow_node->node_flag = new_node_flag;
+ shadow_node->ja = ja;
/*
* Lock can be inherited from previous node at this position.
*/
flavor = cds_lfht_rcu_flavor(ht);
flavor->read_lock();
ret_node = cds_lfht_add_unique(ht,
- hash_pointer(new_node, hash_seed),
+ hash_pointer(new_node_flag, hash_seed),
match_pointer,
- new_node,
+ new_node_flag,
&shadow_node->ht_node);
flavor->read_unlock();
{
struct cds_ja_shadow_node *shadow_node =
caa_container_of(head, struct cds_ja_shadow_node, head);
- free(shadow_node->node);
+ free(ja_node_ptr(shadow_node->node_flag));
free(shadow_node);
}
{
struct cds_ja_shadow_node *shadow_node =
caa_container_of(head, struct cds_ja_shadow_node, head);
- assert(!shadow_node->is_root);
- free(shadow_node->node);
+ assert(shadow_node->level);
+ free(ja_node_ptr(shadow_node->node_flag));
free(shadow_node->lock);
free(shadow_node);
}
__attribute__((visibility("protected")))
int rcuja_shadow_clear(struct cds_lfht *ht,
- struct cds_ja_inode *node,
+ struct cds_ja_inode_flag *node_flag,
struct cds_ja_shadow_node *shadow_node,
unsigned int flags)
{
flavor = cds_lfht_rcu_flavor(ht);
flavor->read_lock();
- cds_lfht_lookup(ht, hash_pointer(node, hash_seed),
- match_pointer, node, &iter);
+ cds_lfht_lookup(ht, hash_pointer(node_flag, hash_seed),
+ match_pointer, node_flag, &iter);
lookup_node = cds_lfht_iter_get_node(&iter);
if (!lookup_node) {
ret = -ENOENT;
ret = cds_lfht_del(ht, lookup_node);
if (!ret) {
if ((flags & RCUJA_SHADOW_CLEAR_FREE_NODE)
- && !shadow_node->is_root) {
+ && shadow_node->level) {
if (flags & RCUJA_SHADOW_CLEAR_FREE_LOCK) {
flavor->update_call_rcu(&shadow_node->head,
free_shadow_node_and_node_and_lock);
*/
__attribute__((visibility("protected")))
void rcuja_shadow_prune(struct cds_lfht *ht,
- unsigned int flags)
+ unsigned int flags,
+ void (*free_node_cb)(struct rcu_head *head))
{
const struct rcu_flavor_struct *flavor;
struct cds_ja_shadow_node *shadow_node;
ret = cds_lfht_del(ht, &shadow_node->ht_node);
if (!ret) {
if ((flags & RCUJA_SHADOW_CLEAR_FREE_NODE)
- && !shadow_node->is_root) {
+ && shadow_node->level) {
+ if (shadow_node->level == shadow_node->ja->tree_depth - 1) {
+ rcuja_free_all_children(shadow_node,
+ shadow_node->node_flag,
+ free_node_cb);
+ }
if (flags & RCUJA_SHADOW_CLEAR_FREE_LOCK) {
flavor->update_call_rcu(&shadow_node->head,
free_shadow_node_and_node_and_lock);
uint16_t pool_size_order; /* pool size */
};
-/*
- * Number of least significant pointer bits reserved to represent the
- * child type.
- */
-#define JA_TYPE_BITS 3
-#define JA_TYPE_MAX_NR (1UL << JA_TYPE_BITS)
-#define JA_TYPE_MASK (JA_TYPE_MAX_NR - 1)
-#define JA_PTR_MASK (~JA_TYPE_MASK)
-
-#define JA_ENTRY_PER_NODE 256UL
-#define JA_LOG2_BITS_PER_BYTE 3U
-#define JA_BITS_PER_BYTE (1U << JA_LOG2_BITS_PER_BYTE)
-
-#define JA_MAX_DEPTH 9 /* Maximum depth, including leafs */
-
-/*
- * Entry for NULL node is at index 8 of the table. It is never encoded
- * in flags.
- */
-#define NODE_INDEX_NULL 8
-
-/*
- * Number of removals needed on a fallback node before we try to shrink
- * it.
- */
-#define JA_FALLBACK_REMOVAL_COUNT 8
-
/*
* Iteration on the array to find the right node size for the number of
* children stops when it reaches .max_child == 256 (this is the largest
JA_RECOMPACT_DEL,
};
-static
-struct cds_ja_inode_flag *ja_node_flag(struct cds_ja_inode *node,
- unsigned long type)
-{
- assert(type < (1UL << JA_TYPE_BITS));
- return (struct cds_ja_inode_flag *) (((unsigned long) node) | type);
-}
-
-static
-struct cds_ja_inode *ja_node_ptr(struct cds_ja_inode_flag *node)
-{
- return (struct cds_ja_inode *) (((unsigned long) node) & JA_PTR_MASK);
-}
-
-static
-unsigned long ja_node_type(struct cds_ja_inode_flag *node)
-{
- unsigned long type;
-
- if (ja_node_ptr(node) == NULL) {
- return NODE_INDEX_NULL;
- }
- type = (unsigned int) ((unsigned long) node & JA_TYPE_MASK);
- assert(type < (1UL << JA_TYPE_BITS));
- return type;
-}
-
struct cds_ja_inode *alloc_cds_ja_node(const struct cds_ja_type *ja_type)
{
return calloc(1U << ja_type->order, sizeof(char));
const struct cds_ja_type *old_type,
struct cds_ja_inode *old_node,
struct cds_ja_shadow_node *shadow_node,
- struct cds_ja_inode_flag **old_node_flag, uint8_t n,
+ struct cds_ja_inode_flag **old_node_flag_ptr, uint8_t n,
struct cds_ja_inode_flag *child_node_flag,
struct cds_ja_inode_flag **nullify_node_flag_ptr)
{
struct cds_ja_inode *new_node;
struct cds_ja_shadow_node *new_shadow_node = NULL;
const struct cds_ja_type *new_type;
- struct cds_ja_inode_flag *new_node_flag;
+ struct cds_ja_inode_flag *new_node_flag, *old_node_flag;
int ret;
int fallback = 0;
+ old_node_flag = *old_node_flag_ptr;
+
switch (mode) {
case JA_RECOMPACT:
new_type_index = old_type_index;
return -ENOMEM;
new_node_flag = ja_node_flag(new_node, new_type_index);
dbg_printf("Recompact inherit lock from %p\n", shadow_node);
- new_shadow_node = rcuja_shadow_set(ja->ht, new_node, shadow_node);
+ new_shadow_node = rcuja_shadow_set(ja->ht, new_node_flag, shadow_node, ja);
if (!new_shadow_node) {
free(new_node);
return -ENOMEM;
n, child_node_flag);
assert(!ret);
}
- /* Return pointer to new recompacted node through old_node_flag */
- *old_node_flag = new_node_flag;
+ /* Return pointer to new recompacted node through old_node_flag_ptr */
+ *old_node_flag_ptr = new_node_flag;
if (old_node) {
int flags;
*/
if (new_type_index == NODE_INDEX_NULL)
flags = RCUJA_SHADOW_CLEAR_FREE_LOCK;
- ret = rcuja_shadow_clear(ja->ht, old_node, shadow_node,
+ ret = rcuja_shadow_clear(ja->ht, old_node_flag, shadow_node,
flags);
assert(!ret);
}
fallback_toosmall:
/* fallback if next pool is too small */
assert(new_shadow_node);
- ret = rcuja_shadow_clear(ja->ht, new_node, new_shadow_node,
+ ret = rcuja_shadow_clear(ja->ht, new_node_flag, new_shadow_node,
RCUJA_SHADOW_CLEAR_FREE_NODE);
assert(!ret);
level, node, node_flag);
assert(node);
- shadow_node = rcuja_shadow_lookup_lock(ja->ht, node);
+ shadow_node = rcuja_shadow_lookup_lock(ja->ht, node_flag);
if (!shadow_node) {
ret = -EAGAIN;
goto end;
}
if (parent_node) {
parent_shadow_node = rcuja_shadow_lookup_lock(ja->ht,
- parent_node);
+ parent_node_flag);
if (!parent_shadow_node) {
ret = -EAGAIN;
goto unlock_shadow;
if (i)
flags |= RCUJA_SHADOW_CLEAR_FREE_NODE;
tmpret = rcuja_shadow_clear(ja->ht,
- ja_node_ptr(created_nodes[i]),
+ created_nodes[i],
NULL,
flags);
assert(!tmpret);
{
struct cds_ja_shadow_node *shadow_node;
- shadow_node = rcuja_shadow_lookup_lock(ja->ht,
- ja_node_ptr(parent_node_flag));
+ shadow_node = rcuja_shadow_lookup_lock(ja->ht, parent_node_flag);
if (!shadow_node)
return -EAGAIN;
cds_hlist_add_head_rcu(&node->list, head);
struct cds_ja_shadow_node *shadow_node;
shadow_node = rcuja_shadow_lookup_lock(ja->ht,
- ja_node_ptr(snapshot[i]));
+ snapshot[i]);
if (!shadow_node) {
ret = -EAGAIN;
goto end;
if (shadow_node->nr_child > 1 || i == 1) {
/* Lock parent and break */
shadow_node = rcuja_shadow_lookup_lock(ja->ht,
- ja_node_ptr(snapshot[i - 1]));
+ snapshot[i - 1]);
if (!shadow_node) {
ret = -EAGAIN;
goto end;
* to recompact parent.
*/
shadow_node = rcuja_shadow_lookup_lock(ja->ht,
- ja_node_ptr(snapshot[i - 2]));
+ snapshot[i - 2]);
if (!shadow_node) {
ret = -EAGAIN;
goto end;
for (i = 0; i < nr_clear; i++) {
ret = rcuja_shadow_clear(ja->ht,
- shadow_nodes[i]->node,
+ shadow_nodes[i]->node_flag,
shadow_nodes[i],
RCUJA_SHADOW_CLEAR_FREE_NODE
| RCUJA_SHADOW_CLEAR_FREE_LOCK);
struct cds_ja_shadow_node *shadow_node;
int ret = 0;
- shadow_node = rcuja_shadow_lookup_lock(ja->ht,
- ja_node_ptr(parent_node_flag));
+ shadow_node = rcuja_shadow_lookup_lock(ja->ht, parent_node_flag);
if (!shadow_node)
return -EAGAIN;
/*
* Note: we should not free this node until judy array destroy.
*/
root_shadow_node = rcuja_shadow_set(ja->ht,
- ja_node_ptr((struct cds_ja_inode_flag *) &ja->root),
- NULL);
+ (struct cds_ja_inode_flag *) &ja->root,
+ NULL, ja);
if (!root_shadow_node) {
ret = -ENOMEM;
goto ht_node_error;
}
- root_shadow_node->is_root = 1;
+ root_shadow_node->level = 0;
return ja;
return NULL;
}
+/*
+ * Called from RCU read-side CS.
+ */
+__attribute__((visibility("protected")))
+void rcuja_free_all_children(struct cds_ja_shadow_node *shadow_node,
+ struct cds_ja_inode_flag *node_flag,
+ void (*free_node_cb)(struct rcu_head *head))
+{
+ const struct rcu_flavor_struct *flavor;
+ unsigned int type_index;
+ struct cds_ja_inode *node;
+ const struct cds_ja_type *type;
+
+ flavor = cds_lfht_rcu_flavor(shadow_node->ja->ht);
+ node = ja_node_ptr(node_flag);
+ assert(node != NULL);
+ type_index = ja_node_type(node_flag);
+ type = &ja_types[type_index];
+
+ switch (type->type_class) {
+ case RCU_JA_LINEAR:
+ {
+ uint8_t nr_child =
+ ja_linear_node_get_nr_child(type, node);
+ unsigned int i;
+
+ for (i = 0; i < nr_child; i++) {
+ struct cds_ja_inode_flag *iter;
+ struct cds_hlist_head head;
+ struct cds_ja_node *entry;
+ struct cds_hlist_node *pos;
+ uint8_t v;
+
+ ja_linear_node_get_ith_pos(type, node, i, &v, &iter);
+ if (!iter)
+ continue;
+ head.next = (struct cds_hlist_node *) iter;
+ cds_hlist_for_each_entry_rcu(entry, pos, &head, list) {
+ flavor->update_call_rcu(&entry->head, free_node_cb);
+ }
+ }
+ break;
+ }
+ case RCU_JA_POOL:
+ {
+ unsigned int pool_nr;
+
+ for (pool_nr = 0; pool_nr < (1U << type->nr_pool_order); pool_nr++) {
+ struct cds_ja_inode *pool =
+ ja_pool_node_get_ith_pool(type, node, pool_nr);
+ uint8_t nr_child =
+ ja_linear_node_get_nr_child(type, pool);
+ unsigned int j;
+
+ for (j = 0; j < nr_child; j++) {
+ struct cds_ja_inode_flag *iter;
+ struct cds_hlist_head head;
+ struct cds_ja_node *entry;
+ struct cds_hlist_node *pos;
+ uint8_t v;
+
+ ja_linear_node_get_ith_pos(type, node, j, &v, &iter);
+ if (!iter)
+ continue;
+ head.next = (struct cds_hlist_node *) iter;
+ cds_hlist_for_each_entry_rcu(entry, pos, &head, list) {
+ flavor->update_call_rcu(&entry->head, free_node_cb);
+ }
+ }
+ }
+ break;
+ }
+ case RCU_JA_NULL:
+ break;
+ case RCU_JA_PIGEON:
+ {
+ uint8_t nr_child;
+ unsigned int i;
+
+ nr_child = shadow_node->nr_child;
+ for (i = 0; i < nr_child; i++) {
+ struct cds_ja_inode_flag *iter;
+ struct cds_hlist_head head;
+ struct cds_ja_node *entry;
+ struct cds_hlist_node *pos;
+
+ iter = ja_pigeon_node_get_ith_pos(type, node, i);
+ if (!iter)
+ continue;
+ head.next = (struct cds_hlist_node *) iter;
+ cds_hlist_for_each_entry_rcu(entry, pos, &head, list) {
+ flavor->update_call_rcu(&entry->head, free_node_cb);
+ }
+ }
+ break;
+ }
+ default:
+ assert(0);
+ }
+}
+
/*
* There should be no more concurrent add to the judy array while it is
* being destroyed (ensured by the caller).
*/
-int cds_ja_destroy(struct cds_ja *ja)
+int cds_ja_destroy(struct cds_ja *ja,
+ void (*free_node_cb)(struct rcu_head *head))
{
int ret;
rcuja_shadow_prune(ja->ht,
- RCUJA_SHADOW_CLEAR_FREE_NODE | RCUJA_SHADOW_CLEAR_FREE_LOCK);
+ RCUJA_SHADOW_CLEAR_FREE_NODE | RCUJA_SHADOW_CLEAR_FREE_LOCK,
+ free_node_cb);
ret = rcuja_delete_ht(ja->ht);
if (ret)
return ret;
}
}
-#if 0
void free_node_cb(struct rcu_head *head)
{
struct ja_test_node *node =
- caa_container_of(head, struct ja_test_node, head);
+ caa_container_of(head, struct ja_test_node, node.head);
free(node);
}
+#if 0
static
void test_delete_all_nodes(struct cds_lfht *ht)
{
rcu_read_unlock();
}
printf("OK\n");
+ printf("Test #4: remove keys (8-bit).\n");
+ for (key = 0; key < 200; key++) {
+ struct cds_hlist_head head;
+ struct ja_test_node *node;
+
+ rcu_read_lock();
+ head = cds_ja_lookup(test_ja, key);
+ node = cds_hlist_first_entry_rcu(&head, struct ja_test_node, node.list);
+ if (!node) {
+ fprintf(stderr, "Error lookup node %" PRIu64 "\n", key);
+ assert(0);
+ }
+ ret = cds_ja_del(test_ja, key, &node->node);
+ if (ret) {
+ fprintf(stderr, "Error (%d) removing node %" PRIu64 "\n", ret, key);
+ assert(0);
+ }
+ call_rcu(&node->node.head, free_node_cb);
+ rcu_read_unlock();
+ }
+ printf("OK\n");
- ret = cds_ja_destroy(test_ja);
+ ret = cds_ja_destroy(test_ja, free_node_cb);
if (ret) {
fprintf(stderr, "Error destroying judy array\n");
return -1;
}
printf("OK\n");
- ret = cds_ja_destroy(test_ja);
+ ret = cds_ja_destroy(test_ja, free_node_cb);
if (ret) {
fprintf(stderr, "Error destroying judy array\n");
return -1;
printf("OK\n");
}
- ret = cds_ja_destroy(test_ja);
+ ret = cds_ja_destroy(test_ja, free_node_cb);
if (ret) {
fprintf(stderr, "Error destroying judy array\n");
return -1;
struct ja_test_node {
struct cds_ja_node node;
uint64_t key; /* for testing */
- /* cache-cold for iteration */
- struct rcu_head head;
};
static inline struct ja_test_node *
#define cds_hlist_entry(ptr, type, member) \
((type *) ((char *) (ptr) - (unsigned long) (&((type *) 0)->member)))
+/* Get first entry from a list. Assumes the hlist is not empty. */
+#define cds_hlist_first_entry(ptr, type, member) \
+ cds_list_entry((ptr)->next, type, member)
+
static inline int cds_hlist_empty(struct cds_hlist_head *head)
{
return !head->next;
projects / userspace-rcu.git / commitdiff
