> hum, is this about having 'large pebs' or there's this window > if there's also only single pebs record allowed? which should > be case for dwarf unwind
With large PEBS today there is never any stack unwind because stack unwinding can be only done from a PMI. The window happens even with single PEBS. It's related to the CPU being pipelined, so complex events may not happen fully atomically. -Andi
