Re: [RFC PATCH 1/1] kvm: Note an RCU quiescent state on guest exit

[Paolo Bonzini]

On 7/11/24 01:18, Leonardo Bras wrote:
> What are your thoughts on above results?
> Anything you would suggest changing?

Can you run the test with a conditional on "!tick_nohz_full_cpu(vcpu->cpu)"?

If your hunch is correct that nohz-full CPUs already avoid 
invoke_rcu_core() you might get the best of both worlds.

tick_nohz_full_cpu() is very fast when there is no nohz-full CPU, 
because then it shortcuts on context_tracking_enabled() (which is just a 
static key).

Paolo