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Message-ID: <54AB9F5D.6070504@redhat.com>
Date: Tue, 06 Jan 2015 09:39:57 +0100
From: Paolo Bonzini <pbonzini@...hat.com>
To: Marcelo Tosatti <mtosatti@...hat.com>,
Andy Lutomirski <luto@...capital.net>
CC: Gleb Natapov <gleb@...nel.org>, kvm list <kvm@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"xen-devel@...ts.xenproject.org" <xen-devel@...ts.xenproject.org>
Subject: Re: [RFC 2/2] x86, vdso, pvclock: Simplify and speed up the vdso
pvclock reader
On 05/01/2015 20:17, Marcelo Tosatti wrote:
> But there is no guarantee that vCPU-N has updated its pvti when
> vCPU-M resumes guest instruction execution.
You're right.
> So the cost this patch removes is mainly from __getcpu (==RDTSCP?) ?
> Perhaps you can use Gleb's idea to stick vcpu id into version field ?
Or just replace __getcpu with rdtscp.
Paolo
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