From: Sean Christopherson <seanjc@google.com>
To: "Li,Rongqing(ACG CCN)" <lirongqing@baidu.com>
Cc: "pbonzini@redhat.com" <pbonzini@redhat.com>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: 答复: [????] Re: [PATCH] KVM: eventfd: Remove redundant synchronize_srcu_expedited from irqfd assignment
Date: Tue, 10 Mar 2026 07:12:02 -0700 [thread overview]
Message-ID: <abAmsiyA4y83ZkXy@google.com> (raw)
In-Reply-To: <b9a1319e93b6445f87ae87a6c419a07f@baidu.com>
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.
prev parent reply other threads:[~2026-03-10 14:12 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-09 9:21 [PATCH] KVM: eventfd: Remove redundant synchronize_srcu_expedited from irqfd assignment lirongqing
2026-03-09 15:36 ` Sean Christopherson
2026-03-10 1:37 ` 答复: [????] " Li,Rongqing(ACG CCN)
2026-03-10 14:12 ` Sean Christopherson [this message]
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