Re: [PATCH v1] rcu: Fix and improve RCU read lock checks when !CONFIG_DEBUG_LOCK_ALLOC

[Steven Rostedt]

On Fri, 14 Jul 2023 21:51:16 +0800
Gao Xiang <hsiangkao@xxxxxxxxxxxxxxxxx> wrote:

> >> we need to work on
> >> CONFIG_PREEMPT_COUNT=n (why not?), we could just always trigger a
> >> workqueue for this.
> >>  
> > 
> > So CONFIG_PREEMPT_COUNT=n users don't deserve good performance? ;-)  
> 
> I'm not sure if non-preemptible kernel users really care about
> such sensitive latencies, I don't know, my 2 cents.

CONFIG_PREEMPT_COUNT=n is for *performance* but not for *latency*. That is,
they care about the overall performance (batch processing) but not
interactive performance.

-- Steve