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]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=abAmsiyA4y83ZkXy@google.com \
--to=seanjc@google.com \
--cc=kvm@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=lirongqing@baidu.com \
--cc=pbonzini@redhat.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox