linux-kernel - Re: [PATCH v2] KVM: trace the events of mmu

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Message-ID: <5055A2E2.9080003@redhat.com>
Date:	Sun, 16 Sep 2012 12:58:58 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
CC:	Marcelo Tosatti <mtosatti@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>, KVM <kvm@...r.kernel.org>
Subject: Re: [PATCH v2] KVM: trace the events of mmu_notifier

On 09/14/2012 08:59 AM, Xiao Guangrong wrote:
> On 09/10/2012 05:26 PM, Xiao Guangrong wrote:
>> On 09/10/2012 05:09 PM, Avi Kivity wrote:
>>> On 09/07/2012 09:16 AM, Xiao Guangrong wrote:
>>>> mmu_notifier is the interface to broadcast the mm events to KVM, the
>>>> tracepoints introduced in this patch can trace all these events, it is
>>>> very helpful for us to notice and fix the bug caused by mm
>>>
>>> There is nothing kvm specific here.  Perhaps this can be made generic
>>> (with a mm parameter so we can filter by process).
>> 
>> Hmm, i would like to put these tracepoints in the mmu-lock then we can clearly
>> know the sequence between mm and kvm mmu. It is useful for us to detect the
>> issue/race between them.
>> 
> 
> Ping...?

Sorry.  Yes you are right, knowing the exact sequence is valuable.  Yet
it will be hard to associate these events with the mmu since we don't
have gpas there.


-- 
error compiling committee.c: too many arguments to function
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