Re: [PATCH v4 1/5] tracing: Introduce faultable tracepoints

[Peter Zijlstra]

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?