Logarithmic asymptotics are proved for the tail of the supremum of
a stochastic process, under the assumption that the process satisfies
a restricted large deviation principle on regularly varying scales.
The formula for the rate of decay of the tail of the supremum, in
terms of the underlying rate function, agrees with that stated by
Duffield and O'Connell [Math. Proc. Cambridge Philos. Soc. (1995)
118 363-374]. The rate function of
the process is not assumed to be convex. A number of queueing
examples are presented which include applications to Gaussian
processes and Weibull sojourn sources.