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Day 1 roundup: Pakistan offspinner Saeed Ajmal picked up two wickets in the last session to restrict Sri Lanka to 220 for 5 at stumps on the first day.
Kumar Sangakkara and Mahela Jayawardene scored 52 and 47 respectively to put respectable total on the board for the visitors.
Angelo Mathews and Perera shared a superb 112-run stand before Junaid struck to send the former back for 91.
Angelo Mathews and Prasanna Jayawardene were still at the crease when stumps were called on Thursday.