From mboxrd@z Thu Jan  1 00:00:00 1970
From: Avi Kivity <avi@redhat.com>
Subject: Re: [PATCH v2 2/3] KVM: x86: add tracepoints to trace mmio begin
 and complete
Date: Thu, 02 Feb 2012 19:36:32 +0200
Message-ID: <4F2AC9A0.7090904@redhat.com>
References: <4F2AC707.7020801@gmail.com> <4F2AC790.1090805@gmail.com>
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Cc: Marcelo Tosatti <mtosatti@redhat.com>, Ingo Molnar <mingo@elte.hu>,
	Arnaldo Carvalho de Melo <acme@infradead.org>,
	Stefan Hajnoczi <stefanha@gmail.com>,
	LKML <linux-kernel@vger.kernel.org>, KVM <kvm@vger.kernel.org>
To: Xiao Guangrong <xiaoguangrong.eric@gmail.com>
Return-path: <linux-kernel-owner@vger.kernel.org>
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On 02/02/2012 07:27 PM, Xiao Guangrong wrote:
> From: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
>
> 'perf kvm-events' will use kvm_exit and kvm_mmio(read...) to calculate
> mmio read emulated time for the old kernel, in order to trace mmio read
> event more exactly, we add kvm_mmio_begin to trace the time when mmio read
> begins
>
> Also, add kvm_mmio_done to trace the time when mmio/pio is completed

Previously, we discussed using the kvm_entry to do this.  This reduces
the number of tracepoints, and is backwards compatible.  What was the
conclusion?

-- 
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