From: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
To: Avi Kivity <avi@redhat.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>,
LKML <linux-kernel@vger.kernel.org>, KVM <kvm@vger.kernel.org>
Subject: Re: [PATCH 2/3] KVM: improve trace events of vmexit/mmio/ioport
Date: Tue, 17 Jan 2012 10:28:11 +0800 [thread overview]
Message-ID: <4F14DCBB.3060207@linux.vnet.ibm.com> (raw)
In-Reply-To: <4F13EFFB.90706@redhat.com>
On 01/16/2012 05:38 PM, Avi Kivity wrote:
> On 01/16/2012 11:32 AM, Xiao Guangrong wrote:
>> - trace vcpu_id for these events
>
> We can infer the vcpu id from the kvm_entry tracepoints, no?
>
Thanks for your review, Avi!
Hmm. i think it is hard to do since the vcpu thread can be scheduled
anytime, one example is as follow:
CPU 0
kvm_entry vcpu 0
......
kvm_entry vcpu 1
......
event1 occurs
......
event2 occurs
It is hard to know the event belong to which kvm_entry?
>> - add kvm_mmio_done to trace the time when mmio/ioport emulation is completed
>
> ditto?
>
I think is ok to get the event end time by using kvm_entry.
>
> Relying on the existing tracepoints will make the tool work on older
> kernels.
>
We can drop all new events, but unfortunately, the information of the origin
tracepoints is not enough, at least vcpu_id need be traced in theses events
to match its events. Yes?
next prev parent reply other threads:[~2012-01-17 2:28 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-16 9:30 [RFC][PATCH] KVM: perf: a smart tool to analyse kvm events Xiao Guangrong
2012-01-16 9:31 ` [PATCH 1/3] KVM: trace mmio read event properly Xiao Guangrong
2012-01-16 10:18 ` Avi Kivity
2012-01-17 2:36 ` Xiao Guangrong
2012-01-16 9:32 ` [PATCH 2/3] KVM: improve trace events of vmexit/mmio/ioport Xiao Guangrong
2012-01-16 9:38 ` Avi Kivity
2012-01-17 2:28 ` Xiao Guangrong [this message]
2012-01-17 11:55 ` Marcelo Tosatti
2012-01-17 17:31 ` David Ahern
2012-01-18 2:32 ` Xiao Guangrong
2012-01-18 5:34 ` David Ahern
2012-01-24 12:44 ` Avi Kivity
2012-01-16 9:32 ` [PATCH 3/3] KVM: perf: kvm events analysis tool Xiao Guangrong
2012-01-16 10:04 ` Avi Kivity
2012-01-17 2:30 ` Xiao Guangrong
2012-01-24 12:49 ` Avi Kivity
2012-01-16 10:08 ` Stefan Hajnoczi
2012-01-17 2:37 ` Xiao Guangrong
2012-01-17 11:59 ` Marcelo Tosatti
2012-01-24 12:51 ` Avi Kivity
2012-01-16 10:11 ` [RFC][PATCH] KVM: perf: a smart tool to analyse kvm events Avi Kivity
2012-01-17 2:30 ` Xiao Guangrong
2012-01-16 22:53 ` David Ahern
2012-01-17 2:41 ` Xiao Guangrong
2012-01-17 4:49 ` David Ahern
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