1 files changed, 52 insertions, 0 deletions
diff --git a/src/rocksdb/utilities/memory/memory_util.cc b/src/rocksdb/utilities/memory/memory_util.cc
new file mode 100644
index 000000000..13c81aec4
--- /dev/null
+++ b/src/rocksdb/utilities/memory/memory_util.cc
@@ -0,0 +1,52 @@
+// Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
+//  This source code is licensed under both the GPLv2 (found in the
+//  COPYING file in the root directory) and Apache 2.0 License
+//  (found in the LICENSE.Apache file in the root directory).
+
+#ifndef ROCKSDB_LITE
+
+#include "rocksdb/utilities/memory_util.h"
+
+#include "db/db_impl/db_impl.h"
+
+namespace ROCKSDB_NAMESPACE {
+
+Status MemoryUtil::GetApproximateMemoryUsageByType(
+    const std::vector<DB*>& dbs,
+    const std::unordered_set<const Cache*> cache_set,
+    std::map<MemoryUtil::UsageType, uint64_t>* usage_by_type) {
+  usage_by_type->clear();
+
+  // MemTable
+  for (auto* db : dbs) {
+    uint64_t usage = 0;
+    if (db->GetAggregatedIntProperty(DB::Properties::kSizeAllMemTables,
+                                     &usage)) {
+      (*usage_by_type)[MemoryUtil::kMemTableTotal] += usage;
+    }
+    if (db->GetAggregatedIntProperty(DB::Properties::kCurSizeAllMemTables,
+                                     &usage)) {
+      (*usage_by_type)[MemoryUtil::kMemTableUnFlushed] += usage;
+    }
+  }
+
+  // Table Readers
+  for (auto* db : dbs) {
+    uint64_t usage = 0;
+    if (db->GetAggregatedIntProperty(DB::Properties::kEstimateTableReadersMem,
+                                     &usage)) {
+      (*usage_by_type)[MemoryUtil::kTableReadersTotal] += usage;
+    }
+  }
+
+  // Cache
+  for (const auto* cache : cache_set) {
+    if (cache != nullptr) {
+      (*usage_by_type)[MemoryUtil::kCacheTotal] += cache->GetUsage();
+    }
+  }
+
+  return Status::OK();
+}
+}  // namespace ROCKSDB_NAMESPACE
+#endif  // !ROCKSDB_LITE