1 files changed, 4 insertions, 7 deletions
diff --git a/src/corelib/io/qlockfile_unix.cpp b/src/corelib/io/qlockfile_unix.cpp
index de21ee217a..dc8817706c 100644
--- a/src/corelib/io/qlockfile_unix.cpp
+++ b/src/corelib/io/qlockfile_unix.cpp
@@ -142,13 +142,10 @@ QLockFile::LockError QLockFilePrivate::tryLock_sys()
 {
     // Assemble data, to write in a single call to write
     // (otherwise we'd have to check every write call)
-    QByteArray fileData;
-    fileData += QByteArray::number(QCoreApplication::applicationPid());
-    fileData += '\n';
-    fileData += qAppName().toUtf8();
-    fileData += '\n';
-    fileData += localHostName().toUtf8();
-    fileData += '\n';
+    // Use operator% from the fast builder to avoid multiple memory allocations.
+    QByteArray fileData = QByteArray::number(QCoreApplication::applicationPid()) % '\n'
+                          % qAppName().toUtf8() % '\n'
+                          % localHostName().toUtf8() % '\n';
 
     const QByteArray lockFileName = QFile::encodeName(fileName);
     const int fd = qt_safe_open(lockFileName.constData(), O_WRONLY | O_CREAT | O_EXCL, 0644);