Backport #55029 to 23.8: ProfileEvents added ContextLockWaitMicroseconds

src/Common/ProfileEvents.cpp

@@ -211,6 +211,7 @@
     \
     M(RegexpCreated, "Compiled regular expressions. Identical regular expressions compiled just once and cached forever.") \
     M(ContextLock, "Number of times the lock of Context was acquired or tried to acquire. This is global lock.") \
+    M(ContextLockWaitMicroseconds, "Context lock wait time in microseconds") \
     \
     M(StorageBufferFlush, "Number of times a buffer in a 'Buffer' table was flushed.") \
     M(StorageBufferErrorOnFlush, "Number of times a buffer in the 'Buffer' table has not been able to flush due to error writing in the destination table.") \

src/Interpreters/Context.cpp

@@ -111,6 +111,7 @@ namespace fs = std::filesystem;
 namespace ProfileEvents
 {
     extern const Event ContextLock;
+    extern const Event ContextLockWaitMicroseconds;
 }
 
 namespace CurrentMetrics
@@ -721,7 +722,10 @@ std::unique_lock<std::recursive_mutex> Context::getLock() const
 {
     ProfileEvents::increment(ProfileEvents::ContextLock);
     CurrentMetrics::Increment increment{CurrentMetrics::ContextLockWait};
-    return std::unique_lock(shared->mutex);
+    Stopwatch watch;
+    auto lock = std::unique_lock(shared->mutex);
+    ProfileEvents::increment(ProfileEvents::ContextLockWaitMicroseconds, watch.elapsedMicroseconds());
+    return lock;
 }
 
 ProcessList & Context::getProcessList() { return shared->process_list; }