Messages in this thread | | | Date | Tue, 21 Nov 2023 16:52:56 +0100 | From | Peter Zijlstra <> | Subject | Re: [PATCH v4 1/5] tracing: Introduce faultable tracepoints |
| |
On Tue, Nov 21, 2023 at 03:46:43PM +0100, Peter Zijlstra wrote:
> Why is this such a hard question?
Anyway, recapping from IRC:
preemptible, SRCU: counter-array based, GP advances by increasing array index and waiting for previous index to drop to 0.
notably, a GP can pass while a task is preempted but not within a critical section.
SRCU has smp_mb() in the critical sections to improve GP.
tasks: waits for every task to pass schedule()
ensures that any pieces of text rendered unreachable before, is actually unused after.
tasks-rude: like tasks, but different? build to handle tracing while rcu-idle, even though that was already deemed bad?
tasks-tracing-rcu: extention of tasks to have critical-sections ? Should this simply be tasks?
Can someone complete, please?
| |