From mboxrd@z Thu Jan 1 00:00:00 1970 From: Xiao Guangrong Subject: Re: [PATCH v2] KVM: trace the events of mmu_notifier Date: Mon, 10 Sep 2012 17:26:07 +0800 Message-ID: <504DB22F.4020609@linux.vnet.ibm.com> References: <50499123.70609@linux.vnet.ibm.com> <504DAE34.1060402@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Cc: Marcelo Tosatti , LKML , KVM To: Avi Kivity Return-path: In-Reply-To: <504DAE34.1060402@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: kvm.vger.kernel.org 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.