On Thu, Jul 17, 2025 at 8:55 AM Steven Rostedt <rostedt@xxxxxxxxxxx> wrote: > > On Thu, 17 Jul 2025 11:40:28 -0400 > Steven Rostedt <rostedt@xxxxxxxxxxx> wrote: > > > Yes, it is a tracepoint infra problem that we are trying to solve. The > > reason we are trying to solve it is because BPF programs can extend the > > time a tracepoint takes. If anything else extended the time, this would > > need to be solved as well. But currently it's only BPF programs that > > cause the issue. > > BTW, if we can't solve this issue and something else came along and > attached to tracepoints that caused unbounded latency, I would also > argue that whatever came along would need to be prevented from being > configured with PREEMPT_RT. My comment wasn't a strike against BPF > programs; It was a strike against something adding unbounded latency > into a critical section that has preemption disabled. Stop blaming the users. Tracepoints disable preemption for now good reason and you keep shifting the blame. Fix tracepoint infra.
