Le Wed, Jul 24, 2024 at 04:43:13PM +0200, Valentin Schneider a écrit : > -/* Turn on heavyweight RCU tasks trace readers on idle/user entry. */ > -static __always_inline void rcu_dynticks_task_trace_enter(void) > +/* Turn on heavyweight RCU tasks trace readers on kernel exit. */ > +static __always_inline void rcu_task_trace_exit(void)
Before I proceed on this last one, a few questions for Paul and others: 1) Why is rcu_dynticks_task_exit() not called while entering in NMI? Does that mean that NMIs aren't RCU-Task read side critical sections? 2) Looking further into CONFIG_TASKS_TRACE_RCU_READ_MB=y, it seems to allow for uses of rcu_read_[un]lock_trace() while RCU is not watching (EQS). Is it really a good idea to support that? Are we aware of any such potential usecase? Thanks!
