fixes #6100 #6232 track memory usage in each txn's range buffer, resetting on...

fixes #6100 #6232 track memory usage in each txn's range buffer, resetting on txn commit and in the escalation callback. large write transactions that get redundant locks in the locktree will now be under control.


git-svn-id: file:///svn/toku/tokudb@54278 c7de825b-a66e-492c-adef-691d508d4ae1

locktree/locktree.cc

@@ -671,6 +671,10 @@ void locktree::set_descriptor(DESCRIPTOR desc) {
     m_cmp->set_descriptor(desc);
 }
 
+locktree::manager::memory_tracker *locktree::get_mem_tracker(void) const {
+    return m_mem_tracker;
+}
+
 int locktree::compare(const locktree *lt) {
     if (m_dict_id.dictid < lt->m_dict_id.dictid) {
         return -1;

locktree/locktree.h

@@ -251,6 +251,8 @@ public:
     };
     ENSURE_POD(manager);
 
+    manager::memory_tracker *get_mem_tracker(void) const;
+
 private:
     manager::memory_tracker *m_mem_tracker;
 

src/ydb_row_lock.cc

@@ -59,7 +59,11 @@ static void db_txn_note_row_lock(DB *db, DB_TXN *txn, const DBT *left_key, const
     }
 
     // add a new lock range to this txn's row lock buffer
+    size_t old_num_bytes = ranges.buffer->get_num_bytes();
     ranges.buffer->append(left_key, right_key);
+    size_t new_num_bytes = ranges.buffer->get_num_bytes();
+    invariant(new_num_bytes > old_num_bytes);
+    lt->get_mem_tracker()->note_mem_used(new_num_bytes - old_num_bytes);
 
     toku_mutex_unlock(&db_txn_struct_i(txn)->txn_mutex);
 }
@@ -112,6 +116,7 @@ void toku_db_txn_escalate_callback(TXNID txnid, const toku::locktree *lt, const
             //
             // We could theoretically steal the memory from the caller instead of copying
             // it, but it's simpler to have a callback API that doesn't transfer memory ownership.
+            lt->get_mem_tracker()->note_mem_released(ranges.buffer->get_num_bytes());
             ranges.buffer->destroy();
             ranges.buffer->create();
             toku::range_buffer::iterator iter;
@@ -121,6 +126,7 @@ void toku_db_txn_escalate_callback(TXNID txnid, const toku::locktree *lt, const
                 ranges.buffer->append(rec.get_left_key(), rec.get_right_key());
                 iter.next();
             }
+            lt->get_mem_tracker()->note_mem_used(ranges.buffer->get_num_bytes());
         } else {
             // In rare cases, we may not find the associated locktree, because we are
             // racing with the transaction trying to add this locktree to the lt map
@@ -209,6 +215,7 @@ void toku_db_release_lt_key_ranges(DB_TXN *txn, txn_lt_key_ranges *ranges) {
     // release all of the locks this txn has ever successfully
     // acquired and stored in the range buffer for this locktree
     lt->release_locks(txnid, ranges->buffer);
+    lt->get_mem_tracker()->note_mem_released(ranges->buffer->get_num_bytes());
     ranges->buffer->destroy();
     toku_free(ranges->buffer);