Re: [PATCH] rcuwait: do not enter RCU protection unless a wakeup is needed

[Peter Zijlstra]

On Wed, Oct 20, 2021 at 08:08:41PM +0800, Wanpeng Li wrote:
> On Wed, 20 Oct 2021 at 20:04, Paolo Bonzini <pbonzini@xxxxxxxxxx> wrote:
> >
> > On 20/10/21 14:01, Wanpeng Li wrote:
> > > Yes, in the attachment.
> > >
> > >      Wanpeng
> >
> > This one does not have CONFIG_PREEMPT=y, let alone CONFIG_PREEMPT_RCU.
> > It's completely impossible that this patch has an effect without those
> > options.
> 
> Sorry, should be this one in the attachment.

Uhhmmm.. you have lockdep enabled. You know you shouldn't be doing
performance measurements with lockdep on, right?