Re: Query regarding synchronize_sched_expedited and resched_cpu

[Steven Rostedt]

On Sun, 17 Sep 2017 11:37:06 +0530
Neeraj Upadhyay <neeraju@xxxxxxxxxxxxxx> wrote:

> Hi Paul, how about replacing raw_spin_trylock_irqsave with
> raw_spin_lock_irqsave in resched_cpu()? Are there any paths
> in RCU code, which depend on trylock check/spinlock recursion?

It looks to me that resched_cpu() was added for nohz full sched
balancing, but is not longer used by that. The only user is currently
RCU. Perhaps we should change that from a trylock to a lock.

-- Steve