Re: [PATCH RFC] sysrq,rcu: suppress RCU stall warnings while sysrq runs

Mike Galbraith
2014-04-25T05:35:58Z

On Thu, 2014-04-24 at 09:04 -0400, Rik van Riel wrote:

> diff --git a/kernel/rcu/update.c b/kernel/rcu/update.c
> index 4c0a9b0..2ac3289 100644
> --- a/kernel/rcu/update.c
> +++ b/kernel/rcu/update.c
> @@ -320,6 +320,17 @@ int rcu_jiffies_till_stall_check(void)
> return till_stall_check * HZ + RCU_STALL_DELAY_DELTA;
> }
>
> +void rcu_sysrq_start(void)
> +{
> + rcu_cpu_stall_suppress = 2;
> +}

Monster box folks seem to routinely kill that at boot, probably won't
want it coming back to life at the poke of a button.

-Mike