  An overview of the most recent measurements of inclusive top quark pair
production cross section is presented. The results are obtained using data
collected with the CMS experiment in proton-proton collisions at centre-of-mass
energies of 5.02, 7, 8 and 13 TeV. The data are compared with the predictions
from perturbative QCD calculations at full NNLO+NNLL accuracy.
