linux-kernel - Re: [PATCH v3 4/5] KVM: LAPIC: Delay trace advance expire delta

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Message-ID: <20190520145621.GA28482@linux.intel.com>
Date:   Mon, 20 May 2019 07:56:22 -0700
From:   Sean Christopherson <sean.j.christopherson@...el.com>
To:     Wanpeng Li <kernellwp@...il.com>
Cc:     LKML <linux-kernel@...r.kernel.org>, kvm <kvm@...r.kernel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Liran Alon <liran.alon@...cle.com>
Subject: Re: [PATCH v3 4/5] KVM: LAPIC: Delay trace advance expire delta

On Mon, May 20, 2019 at 02:38:44PM +0800, Wanpeng Li wrote:
> On Sat, 18 May 2019 at 03:44, Sean Christopherson
> <sean.j.christopherson@...el.com> wrote:
> > This needs to be guarded with lapic_in_kernel(vcpu).  But, since this is
> > all in the same flow, a better approach would be to return the delta from
> > wait_lapic_expire().  That saves 8 bytes in struct kvm_timer and avoids
> > additional checks for tracing the delta.
> 
> As you know, the function wait_lapic_expire() will be moved to vmx.c
> and svm.c, so this is not suitable any more.

Doh, I was too excited about my cleverness and completely forgot why you
were moving the tracepoint in the first place.