On 08/31/2018 08:48 AM, Yu-cheng Yu wrote: > To trigger a race in ptep_set_wrprotect(), we need to fork from one of > three pthread siblings. > > Or do we measure only how much this affects fork? > If there is no racing, the effect should be minimal. We don't need a race. I think the cmpxchg will be slower, even without a race, than the code that was there before. The cmpxchg is a simple, straightforward solution, but we're putting it in place of a plain memory write, which is suboptimal. But, before I nitpick the performance, I wanted to see if we could even detect a delta.
