On Tue, Nov 21, 2023 at 11:11:57AM -0500, Mathieu Desnoyers wrote: > On 2023-11-21 11:07, Steven Rostedt wrote: > > On Tue, 21 Nov 2023 11:00:13 -0500 > > Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx> wrote: > > > > > > tasks-tracing-rcu: > > > > extention of tasks to have critical-sections ? Should this simply be > > > > tasks? > > > > > > tasks-trace-rcu is meant to allow tasks to block/take a page fault > > > within the read-side. It is specialized for tracing and has a single > > > domain. It does not need the smp_mb on the read-side, which makes it > > > lower-overhead than SRCU. > > > > IOW, task-trace-rcu allows the call to schedule in its critical section, > > whereas task-rcu does not? > > Correct. > > And unlike preemptible rcu, tasks-trace-rcu allows calls to schedule which > do not provide priority inheritance guarantees (such as I/O triggered by > page faults). But please keep it to things allowed in vanilla RCU read-side critical sections and I/O triggered by page faults. If you need something else, that is a discussion between all the current users of RCU Tasks Trace. Thanx, Paul
