Re: 答复: [????] Re: [PATCH] KVM: eventfd: Remove redundant synchronize_srcu_expedited from irqfd assignment

[Sean Christopherson]

On Tue, Mar 10, 2026, Li,Rongqing(ACG CCN) wrote:
> > > Removing this call reduces latency during resampling irqfd setup.
> > 
> > May I ask why you're micro-optimizing VMst with an in-kernel I/O APIC?
> 
> Few devices use it anymore; I just think the kernel ABI shouldn't require
> synchronize_srcu_expedited.

That's a *very* broad stance to take.  For all intents and purposes, eliminating
SRCU synchronization in KVM means eliminating SRCU usage entirely.  That's not
completely infeasible, but I don't see it happening anytime soon given how much
KVM relies on the properties of SRCU to avoid unnecessary serialization.