On Thu, Aug 27, 2020 at 06:30:01PM -0400, Joel Fernandes wrote: > On Thu, Aug 27, 2020 at 09:47:48AM +0200, pet...@infradead.org wrote:
> > All trace_*_rcuidle() and RCU_NONIDLE() usage is a bug IMO. > > > > Ideally RCU-trace goes away too. > > I was thinking that unless the rcu_idle_enter/exit calls coincide with points > in the kernel where instrumentation is not allowed, there is always a chance > somebody wants to use tracepoints after rcu_idle_enter or before exit. In > this case, trace_*_rcuidle() is unavoidable unless you can move the > rcu_idle_enter/exit calls deeper as you are doing. > > Maybe objtool can help with that? The eventual goal is to mark idle code noinstr too. There's more work before we can do that.
