On June 19, 2025 4:48:13 AM EDT, Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote: >On Thu, Jun 19, 2025 at 10:44:27AM +0200, Peter Zijlstra wrote: > >> Luckily, x86 dropped support for !CMPXCHG8B right along with !TSC. So on >> x86 we good with timestamps, even on 32bit. > >Well, not entirely true, local_clock() is not guaranteed monotonic. So >you might be in for quite a bit of hurt if you rely on that. > As long as it is monotonic per task. If it is not, then pretty much all tracers that use it are broken. -- Steve
