Elliptic flow p.d.f. $P(v_2)$ rescaled by the mean $v_2$ ($\langle v_2 \rangle$) of inclusive charged particles for Pb--Pb collisions at $\sqrt{{\textit s}_\text{NN}} = 5.02$ TeV, in different centrality classes. Several hydrodynamic calculations and previous measurements from ATLAS at lower energies are shown for comparison.