Messages in this thread | | | Date | Tue, 21 Nov 2023 11:11:57 -0500 | Subject | Re: [PATCH v4 1/5] tracing: Introduce faultable tracepoints | From | Mathieu Desnoyers <> |
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On 2023-11-21 11:07, Steven Rostedt wrote: > On Tue, 21 Nov 2023 11:00:13 -0500 > Mathieu Desnoyers <mathieu.desnoyers@efficios.com> 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).
Thanks,
Mathieu
-- Mathieu Desnoyers EfficiOS Inc. https://www.efficios.com
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