From mboxrd@z Thu Jan 1 00:00:00 1970 From: Joerg Roedel Subject: Re: [RFC] Unify KVM kernel-space and user-space code into a single project Date: Wed, 24 Mar 2010 17:23:43 +0100 Message-ID: <20100324162343.GK14800@8bytes.org> References: <20100323182153.GA14800@8bytes.org> <4BA99BCB.5080501@redhat.com> <20100324115900.GB14800@8bytes.org> <4BAA00B1.20407@redhat.com> <20100324125043.GC14800@8bytes.org> <4BAA0DFE.1080700@redhat.com> <20100324134642.GD14800@8bytes.org> <4BAA1A53.20207@redhat.com> <20100324150137.GE14800@8bytes.org> <1269446622.5109.388.camel@twins> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Avi Kivity , Anthony Liguori , Ingo Molnar , Pekka Enberg , "Zhang, Yanmin" , Sheng Yang , linux-kernel@vger.kernel.org, kvm@vger.kernel.org, Marcelo Tosatti , Jes Sorensen , Gleb Natapov , ziteng.huang@intel.com, Arnaldo Carvalho de Melo , Fr?d?ric Weisbecker , Gregory Haskins To: Peter Zijlstra Return-path: Content-Disposition: inline In-Reply-To: <1269446622.5109.388.camel@twins> Sender: linux-kernel-owner@vger.kernel.org List-Id: kvm.vger.kernel.org On Wed, Mar 24, 2010 at 05:03:42PM +0100, Peter Zijlstra wrote: > On Wed, 2010-03-24 at 16:01 +0100, Joerg Roedel wrote: > > > What I meant was: perf-kernel puts the guest-name into every sample and > > perf-userspace accesses /sys/kvm/guest_name/fs/ later to resolve the > > symbols. I leave the question of how the guest-fs is exposed to the host > > out of this discussion. We should discuss this seperatly. > > I'd much prefer a pid like suggested later, keeps the samples smaller. > > But that said, we need guest kernel events like mmap and context > switches too, otherwise we simply can't make sense of guest userspace > addresses, we need to know the guest address space layout. With the filesystem approach all we need is the pid of the guest process. Then we can access proc//maps of the guest and read out the address space layout, no? Joerg