SERVER-35159 Track transactions latency and add to serverStatus output

2 files changed, 11 insertions, 1 deletions

diff --git a/src/mongo/db/stats/top.cpp b/src/mongo/db/stats/top.cpp
index 155f122fef5..5f6b5c2e7a0 100644
--- a/src/mongo/db/stats/top.cpp
+++ b/src/mongo/db/stats/top.cpp
@@ -220,6 +220,11 @@ void Top::appendGlobalLatencyStats(bool includeHistograms, BSONObjBuilder* build
     _globalHistogramStats.append(includeHistograms, builder);
 }
 
+void Top::incrementGlobalTransactionLatencyStats(uint64_t latency) {
+    stdx::lock_guard<SimpleMutex> guard(_lock);
+    _globalHistogramStats.increment(latency, Command::ReadWriteType::kTransaction);
+}
+
 void Top::_incrementHistogram(OperationContext* opCtx,
                               long long latency,
                               OperationLatencyHistogram* histogram,
diff --git a/src/mongo/db/stats/top.h b/src/mongo/db/stats/top.h
index 6dc2cf7f8a3..edcc72778b7 100644
--- a/src/mongo/db/stats/top.h
+++ b/src/mongo/db/stats/top.h
@@ -112,13 +112,18 @@ public:
     void appendLatencyStats(StringData ns, bool includeHistograms, BSONObjBuilder* builder);
 
     /**
-     * Increments the global histogram.
+     * Increments the global histogram only if the operation came from a user.
      */
     void incrementGlobalLatencyStats(OperationContext* opCtx,
                                      uint64_t latency,
                                      Command::ReadWriteType readWriteType);
 
     /**
+     * Increments the global transactions histogram.
+     */
+    void incrementGlobalTransactionLatencyStats(uint64_t latency);
+
+    /**
      * Appends the global latency statistics.
      */
     void appendGlobalLatencyStats(bool includeHistograms, BSONObjBuilder* builder);