emit dataChanged(
            index(0,0)
        ,   index(rowCount() - 1,0)
    );

The optional roles argument can be used to specify which data roles have actually been modified. An empty vector in the roles argument means that all roles should be considered modified. 

#include <QGuiApplication>
#include <QQmlApplicationEngine>

#include <QAbstractListModel>
#include <QDebug>
#include <QHash>
#include <QQmlContext>

#include <deque>

class MyModel : public QAbstractListModel {
  Q_OBJECT;

 private:
  std::deque<int> array;
  size_t capacity = 10;

 public:
  Q_INVOKABLE void add(int v) {
    if (array.size() == capacity) {
      array.pop_back();
      array.push_front(v);
      emit dataChanged(index(0), index(array.size() - 1));
    } else {
      array.push_front(v);
      beginInsertRows(QModelIndex(), 0, 0);
      endInsertRows();
    }
  }
  // QAbstractItemModel interface
 public:
  virtual int rowCount(const QModelIndex& parent) const override {
    if (parent.isValid())
      return 0;
    return array.size();
  }
  virtual QVariant data(const QModelIndex& index, int role) const override {
    if (index.isValid()) {
      switch (role) {
        case Qt::UserRole: {
          return array[index.row()];
        }
      }
    }
    return QVariant();
  }
  virtual QHash<int, QByteArray> roleNames() const override {
    static QHash<int, QByteArray> roles = {{Qt::UserRole, QByteArray{"name"}}};
    return roles;
  }
};

int main(int argc, char* argv[]) {
  QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);

  QGuiApplication app(argc, argv);

  QQmlApplicationEngine engine;
  MyModel model;
  engine.rootContext()->setContextProperty("globalModel", &model);
  const QUrl url(QStringLiteral("qrc:/main.qml"));
  QObject::connect(
      &engine, &QQmlApplicationEngine::objectCreated, &app,
      [url](QObject* obj, const QUrl& objUrl) {
        if (!obj && url == objUrl)
          QCoreApplication::exit(-1);
      },
      Qt::QueuedConnection);
  engine.load(url);

  return app.exec();
}

#include "main.moc"

import QtQuick 2.12
import QtQuick.Window 2.12

Window {
    visible: true
    width: 640
    height: 480
    title: qsTr("Hello World")

    property int counter: 0

    ListView {
        model: globalModel
        delegate: Text {
            text: name
        }
        anchors.fill: parent
    }

    Timer {
        repeat: true
        running: true
        interval: 1000
        onTriggered: {
            globalModel.add(++counter)
        }
    }
}