rcuja: below equal/above equal

[userspace-rcu.git] / rcuja / rcuja-internal.h

diff --git a/rcuja/rcuja-internal.h b/rcuja/rcuja-internal.h
index 96e9dabf6225d58ebb91e445c574c8a21ecc3551..2d3f131e7764c64f2e57448c72ee385043869e1b 100644 (file)
--- a/rcuja/rcuja-internal.h
+++ b/rcuja/rcuja-internal.h
@@ -43,6 +43,9 @@
 #define JA_LOG2_BITS_PER_BYTE  3U
 #define JA_BITS_PER_BYTE       (1U << JA_LOG2_BITS_PER_BYTE)
 
+#define JA_POOL_1D_MASK        ((JA_BITS_PER_BYTE - 1) << JA_TYPE_BITS)
+#define JA_POOL_2D_MASK        (JA_POOL_1D_MASK << JA_LOG2_BITS_PER_BYTE)
+
 #define JA_MAX_DEPTH   9       /* Maximum depth, including leafs */
 
 /*
@@ -91,6 +94,10 @@ struct cds_ja {
         */
        struct cds_lfht *ht;
        unsigned long nr_fallback;      /* Number of fallback nodes used */
+
+       /* For debugging */
+       unsigned long node_fallback_count_distribution[JA_ENTRY_PER_NODE];
+       unsigned long nr_nodes_allocated, nr_nodes_freed;
 };
 
 static inline
@@ -102,28 +109,72 @@ struct cds_ja_inode_flag *ja_node_flag(struct cds_ja_inode *node,
 }
 
 static inline
-struct cds_ja_inode *ja_node_ptr(struct cds_ja_inode_flag *node)
+struct cds_ja_inode_flag *ja_node_flag_pool_1d(struct cds_ja_inode *node,
+               unsigned long type, unsigned long bitsel)
+{
+       assert(type < (1UL << JA_TYPE_BITS));
+       assert(bitsel < JA_BITS_PER_BYTE);
+       return (struct cds_ja_inode_flag *) (((unsigned long) node) | (bitsel << JA_TYPE_BITS) | type);
+}
+
+static inline
+struct cds_ja_inode_flag *ja_node_flag_pool_2d(struct cds_ja_inode *node,
+               unsigned long type, unsigned int bitsel[2])
+{
+       assert(type < (1UL << JA_TYPE_BITS));
+       assert(bitsel[0] < JA_BITS_PER_BYTE);
+       assert(bitsel[1] < JA_BITS_PER_BYTE);
+       return (struct cds_ja_inode_flag *) (((unsigned long) node) | (bitsel[0] << (JA_TYPE_BITS + JA_LOG2_BITS_PER_BYTE)) | (bitsel[1] << JA_TYPE_BITS) | type);
+}
+
+static inline
+unsigned long ja_node_pool_1d_bitsel(struct cds_ja_inode_flag *node)
+{
+       return ((unsigned long) node & JA_POOL_1D_MASK) >> JA_TYPE_BITS;
+}
+
+static inline
+void ja_node_pool_2d_bitsel(struct cds_ja_inode_flag *node, unsigned long *bits)
 {
-       return (struct cds_ja_inode *) (((unsigned long) node) & JA_PTR_MASK);
+       bits[0] = ((unsigned long) node & JA_POOL_2D_MASK) >> (JA_TYPE_BITS + JA_LOG2_BITS_PER_BYTE);
+       bits[1] = ((unsigned long) node & JA_POOL_1D_MASK) >> JA_TYPE_BITS;
 }
 
+/* Hardcoded pool indexes for fast path */
+#define RCU_JA_POOL_IDX_5      5
+#define RCU_JA_POOL_IDX_6      6
 static inline
-unsigned long ja_node_type(struct cds_ja_inode_flag *node)
+struct cds_ja_inode *ja_node_ptr(struct cds_ja_inode_flag *node)
 {
-       unsigned long type;
+       unsigned long v, type_idx;
+
+       if (!node)
+               return NULL;    /* RCU_JA_NULL */
+       v = (unsigned long) node;
+       type_idx = v & JA_TYPE_MASK;
 
-       if (ja_node_ptr(node) == NULL) {
-               return NODE_INDEX_NULL;
+       switch (type_idx) {
+       case RCU_JA_POOL_IDX_5:
+               v &= ~(JA_POOL_1D_MASK | JA_TYPE_MASK);
+               break;
+       case RCU_JA_POOL_IDX_6:
+               v &= ~(JA_POOL_2D_MASK | JA_POOL_1D_MASK | JA_TYPE_MASK);
+               break;
+       default:
+               /* RCU_JA_LINEAR or RCU_JA_PIGEON */
+               v &= JA_PTR_MASK;
+               break;
        }
-       type = (unsigned int) ((unsigned long) node & JA_TYPE_MASK);
-       assert(type < (1UL << JA_TYPE_BITS));
-       return type;
+       return (struct cds_ja_inode *) v;
 }
 
+__attribute__((visibility("protected")))
+unsigned long ja_node_type(struct cds_ja_inode_flag *node);
+
 __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));
+               void (*free_node_cb)(struct cds_ja_node *node));
 
 __attribute__((visibility("protected")))
 struct cds_ja_shadow_node *rcuja_shadow_lookup_lock(struct cds_lfht *ht,
@@ -136,7 +187,7 @@ __attribute__((visibility("protected")))
 struct cds_ja_shadow_node *rcuja_shadow_set(struct cds_lfht *ht,
                struct cds_ja_inode_flag *new_node_flag,
                struct cds_ja_shadow_node *inherit_from,
-               struct cds_ja *ja);
+               struct cds_ja *ja, int level);
 
 /* rcuja_shadow_clear flags */
 enum {
@@ -153,7 +204,7 @@ int rcuja_shadow_clear(struct cds_lfht *ht,
 __attribute__((visibility("protected")))
 void rcuja_shadow_prune(struct cds_lfht *ht,
                unsigned int flags,
-               void (*free_node_cb)(struct rcu_head *head));
+               void (*free_node_cb)(struct cds_ja_node *node));
 
 __attribute__((visibility("protected")))
 struct cds_lfht *rcuja_create_ht(const struct rcu_flavor_struct *flavor);
@@ -161,6 +212,25 @@ struct cds_lfht *rcuja_create_ht(const struct rcu_flavor_struct *flavor);
 __attribute__((visibility("protected")))
 int rcuja_delete_ht(struct cds_lfht *ht);
 
+__attribute__((visibility("protected")))
+void free_cds_ja_node(struct cds_ja *ja, struct cds_ja_inode *node);
+
+/*
+ * Iterate through duplicates returned by cds_ja_lookup*()
+ * Receives a struct cds_ja_node * as parameter, which is used as start
+ * of duplicate list and loop cursor.
+ */
+#define cds_ja_for_each_duplicate(pos)                                 \
+       for (; (pos) != NULL; (pos) = (pos)->next)
+
+/*
+ * Iterate through duplicates returned by cds_ja_lookup*()
+ * Safe against removal of entries during traversal.
+ */
+#define cds_ja_for_each_duplicate_safe(_pos, _next)                    \
+       for (; (_pos) != NULL ? ((_next) = (_pos)->next, 1) : 0;        \
+               (_pos) = (_next))
+
 //#define DEBUG
 
 #ifdef __linux__