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Message-ID: <4e27adf7df5de525b9a4af9afbb3ca88ec3d09a4.camel@suse.com>
Subject: Re: [PATCH] Move VMEnter and VMExit tracepoints closer to the
 actual event
From:   Dario Faggioli <dfaggioli@suse.com>
To:     Paolo Bonzini <pbonzini@redhat.com>,
        Sean Christopherson <seanjc@google.com>,
        Stefano De Venuto <stefano.devenuto99@gmail.com>
Cc:     linux-kernel@vger.kernel.org, vkuznets@redhat.com,
        wanpengli@tencent.com, jmattson@google.com, x86@kernel.org,
        hpa@zytor.com, kvm@vger.kernel.org, rostedt@goodmis.org,
        y.karadz@gmail.com
Date:   Fri, 21 May 2021 09:58:17 +0200
In-Reply-To: <ab44e5b1-4448-d6c8-6cda-5e41866f69f1@redhat.com>
References: <20210519182303.2790-1-stefano.devenuto99@gmail.com>
         <YKaBEn6oUXaVAb0K@google.com>
         <ab44e5b1-4448-d6c8-6cda-5e41866f69f1@redhat.com>
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Hi!

On Thu, 2021-05-20 at 18:18 +0200, Paolo Bonzini wrote:
> On 20/05/21 17:32, Sean Christopherson wrote:
> > On VMX, I think the tracepoint can be moved below the VMWRITEs
> > without much
> > contention (though doing so is likely a nop), but moving it below
> > kvm_load_guest_xsave_state() requires a bit more discussion.
>=20
> Indeed; as a rule of thumb, the tracepoint on SVM could match the=20
> clgi/stgi region, and on VMX it could be placed in a similar
> location.
>=20
Ok. So, if this is uncontroversial enough, we're more than happy to go
for it... For now. :-)

Let us try it, and see how things end up looking.

Thanks and Regards
--=20
Dario Faggioli, Ph.D
http://about.me/dario.faggioli
Virtualization Software Engineer
SUSE Labs, SUSE https://www.suse.com/
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