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).
Thanks,
Mathieu
--
Mathieu Desnoyers
EfficiOS Inc.
https://www.efficios.com
