Re: [PATCH v2] tracing: relax trace_event_eval_update() execution with cond_resched()

[Atish Kumar Patra]

On Fri, Sep 29, 2023 at 12:17 PM Clément Léger <cleger@xxxxxxxxxxxx> wrote:
>
> When kernel is compiled without preemption, the eval_map_work_func()
> (which calls trace_event_eval_update()) will not be preempted up to its
> complete execution. This can actually cause a problem since if another
> CPU call stop_machine(), the call will have to wait for the
> eval_map_work_func() function to finish executing in the workqueue
> before being able to be scheduled. This problem was observe on a SMP
> system at boot time, when the CPU calling the initcalls executed
> clocksource_done_booting() which in the end calls stop_machine(). We
> observed a 1 second delay because one CPU was executing
> eval_map_work_func() and was not preempted by the stop_machine() task.
>
> Adding a call to cond_resched() in trace_event_eval_update() allows
> other tasks to be executed and thus continue working asynchronously
> like before without blocking any pending task at boot time.
>
> Signed-off-by: Clément Léger <cleger@xxxxxxxxxxxx>
> ---
>
> Changes in v2:
>  - Use cond_resched() instead of schedule()
>
>  kernel/trace/trace_events.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
> index 91951d038ba4..f49d6ddb6342 100644
> --- a/kernel/trace/trace_events.c
> +++ b/kernel/trace/trace_events.c
> @@ -2770,6 +2770,7 @@ void trace_event_eval_update(struct trace_eval_map **map, int len)
>                                 update_event_fields(call, map[i]);
>                         }
>                 }
> +               cond_resched();
>         }
>         up_write(&trace_event_sem);
>  }

(First email got rejected as gmail decided to switch back the format
to html :(). Sorry for the noise.
Thanks for the fix. The boot time improvement is evident in both
spike/Qemu. FWIW
Tested-by: Atish Patra <atishp@xxxxxxxxxxxx>
Reviewed-by: Atish Patra <atishp@xxxxxxxxxxxx>

> --
> 2.40.1
>