* Dave Jones <davej@xxxxxxxxxx> wrote: > It's crossed my mind to turn it on occasionally in rawhide just to > shake out those hard to find bugs. The thing that's put me off has > been that well, we've got enough bugs already without needing to find > more right now. it's on by default in -rt and i havent had a bug triggered by it for quite a long time. We had many SMP races triggered by PREEMPT_RT. part of the reason of PREEMPT_BKL's reliability is because when i did it i also wrote debugging infrastructure to catch bugs that would only trigger on PREEMPT_BKL=y: the smp_processor_id() debugging code of CONFIG_DEBUG_PREEMPT. (and that infrastructure, like lockdep, catches bugs before they actually happen, by flagging buggy codepath the first time it ever executes) Ingo
