This is re-post. The original posting was on Dec 15th but it was missing cc to LKML. I got some responses on that thread so didn't suspect LKML was missing. If you're getting it the second time. My apologies. Stuff pointed out in the original thread are... * Is the quick variant of backtrace gathering really necessary? - Still need to get performance numbers. * TRACE_EVENT_CONDITION() can be used