From 38e05a18e716da5020d8f01f37e8bd8cf8f769b1 Mon Sep 17 00:00:00 2001
From: Eric Milkie <milkie@mongodb.com>
Date: Mon, 23 Dec 2019 22:59:34 +0000
Subject: SERVER-44964 calculate index build memory usage per key based on
 BSONObj buffer capacity instead of object size

---
 src/mongo/bson/bsonobj.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'src/mongo/bson/bsonobj.h')

diff --git a/src/mongo/bson/bsonobj.h b/src/mongo/bson/bsonobj.h
index 5f50271e4c7..f5d5670223e 100644
--- a/src/mongo/bson/bsonobj.h
+++ b/src/mongo/bson/bsonobj.h
@@ -574,8 +574,8 @@ public:
         return BSONObj(static_cast<const char*>(ptr));
     }
     int memUsageForSorter() const {
-        // TODO consider ownedness?
-        return sizeof(BSONObj) + objsize();
+        const auto ownedSize = isOwned() ? _ownedBuffer.capacity() : 0;
+        return sizeof(BSONObj) + ownedSize;
     }
 
 private:
-- 
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