From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:43239) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1baNTa-0000fo-32 for qemu-devel@nongnu.org; Thu, 18 Aug 2016 09:35:21 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1baNTW-0000M0-Ds for qemu-devel@nongnu.org; Thu, 18 Aug 2016 09:35:18 -0400 Received: from mx1.redhat.com ([209.132.183.28]:40702) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1baNTW-0000Lw-7N for qemu-devel@nongnu.org; Thu, 18 Aug 2016 09:35:14 -0400 Date: Thu, 18 Aug 2016 14:35:09 +0100 From: "Daniel P. Berrange" Message-ID: <20160818133509.GF13050@redhat.com> Reply-To: "Daniel P. Berrange" References: <20160818131121.GE13050@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: Subject: Re: [Qemu-devel] errno 13, fopen qemu trace file. List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Nir Levy Cc: "qemu-devel@nongnu.org" , Stefan Hajnoczi On Thu, Aug 18, 2016 at 01:31:19PM +0000, Nir Levy wrote: > Daniel, Thanks for your response. > > But I have succeeded using simpletrace when building libvirt from source file into some/other/dir/install I can only assume you built libvirt so that qemu runs as root, instead of an unprivileged user account, and/or have not enabled selinux for libvirt. > > I am using Fedora22 which does not support lttng. > at the mather of fact I have installed lttng before and build the kernel modules (2.6.0) still no trace generated. > Michael Jeanson is working for supplying modules (2.8.0) for the next fedora (25) > fedora 23 and 24 do support systemtap but not over 22 on my kernel 4.2.8 (which we stick to in Asocs due to known performance degradation in later releases) systemtap is supported in all Fedora releases - if there's any problems do file bugs against it, as its expected to work as it is the supported tracing mechanism for Fedora with qemu and libvirt. Regards, Daniel -- |: http://berrange.com -o- http://www.flickr.com/photos/dberrange/ :| |: http://libvirt.org -o- http://virt-manager.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: http://entangle-photo.org -o- http://live.gnome.org/gtk-vnc :|