Enable point table insert search tracking.

Author: evoskuil

include/bitcoin/database/impl/primitives/hashmap.ipp

@@ -377,6 +377,9 @@ inline bool CLASS::put(bool& duplicate, const memory_ptr& ptr,
     if (!write(previous_head, ptr, link, key, element))
         return false;
 
+    if (!previous_head.is_terminal())
+        counter_.fetch_add(one, std::memory_order_relaxed);
+
     duplicate = !first(ptr, previous_head, key).is_terminal();
     return true;
 }
@@ -552,7 +555,11 @@ bool CLASS::write(Link& previous, const memory_ptr& ptr, const Link& link,
         return false;
 
     // If filter collision set previous stack head for conflict resolution.
-    previous = collision ? next : Link::terminal;
+    if (collision)
+        previous = next;
+    else
+        previous = Link::terminal;
+
     return true;
 }
 

include/bitcoin/database/primitives/hashmap.hpp

@@ -19,6 +19,7 @@
 #ifndef LIBBITCOIN_DATABASE_PRIMITIVES_HASHMAP_HPP
 #define LIBBITCOIN_DATABASE_PRIMITIVES_HASHMAP_HPP
 
+#include <atomic>
 #include <bitcoin/system.hpp>
 #include <bitcoin/database/define.hpp>
 #include <bitcoin/database/memory/memory.hpp>
@@ -78,6 +79,12 @@ class hashmap
     /// Increase count as neccesary to specified.
     bool expand(const Link& count) NOEXCEPT;
 
+    /// Count of puts resulting in table body search to detect duplication.
+    size_t search_count() const NOEXCEPT
+    {
+        return counter_.load(std::memory_order_relaxed);
+    }
+
     /// Errors.
     /// -----------------------------------------------------------------------
 
@@ -226,6 +233,7 @@ class hashmap
 
     // Thread safe.
     body body_;
+    std::atomic<size_t> counter_{};
 };
 
 template <typename Element>