Discipline priest pvp

Hi, i've played for a while on this server and i love it! I mainly play rogue but i can manage myself with warrior and paladin as well. I have only one question: what counters discipline priest ? This is by far the worst matchup i've come across, and i can say i quite hate it. They're too resilient and their mana barely goes down. I'm looking for some tips or some classes that hard counter this blasted spec

udk as usual

Offensive dispels (Mage, Shaman, other priests etc) and strong constant pressure (as mentioned, unholy dk is a good example) perform well against them.

Arms warrior with mortal strike and rouge with deadly poison stack + wound should be the go.