From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:34150) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UIzup-0006TQ-KV for qemu-devel@nongnu.org; Fri, 22 Mar 2013 07:13:46 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1UIzuo-0005xG-1y for qemu-devel@nongnu.org; Fri, 22 Mar 2013 07:13:43 -0400 Received: from mail-ve0-f175.google.com ([209.85.128.175]:38311) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UIzun-0005xA-Uc for qemu-devel@nongnu.org; Fri, 22 Mar 2013 07:13:41 -0400 Received: by mail-ve0-f175.google.com with SMTP id pb11so228612veb.6 for ; Fri, 22 Mar 2013 04:13:41 -0700 (PDT) Sender: Paolo Bonzini Message-ID: <514C3CE1.3000100@redhat.com> Date: Fri, 22 Mar 2013 12:13:37 +0100 From: Paolo Bonzini MIME-Version: 1.0 References: <514C1560.1020406@jp.fujitsu.com> In-Reply-To: <514C1560.1020406@jp.fujitsu.com> Content-Type: text/plain; charset=ISO-2022-JP Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] [PATCH 0/5] Add some tracepoints for clarification of the cause of troubles List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Kazuya Saito Cc: qemu-devel@nongnu.org Il 22/03/2013 09:25, Kazuya Saito ha scritto: > This series adds tracepoints for helping us clarify the cause of > troubles. Virtualization on Linux is composed of some components such > as qemu, kvm, libvirt, and so on. So it is very important to clarify > firstly and swiftly the cause of troubles is on what component of > them. Although qemu has useful information of this because it stands > among kvm, libvirt and guest, it doesn't output the information by > trace or log system. > These patches add tracepoints which lead to reduce the time of the > clarification. We'd like to add the tracepoints as the first set > because, based on our experience, we've found out they must be useful > for an investigation in the future. Without those tracepoints, > we had a really hard time investigating a problem since the problem's > reproducibility was quite low and there was no clue in the dump of > qemu. > > Kazuya Saito (5): > vl: add runstate_set tracepoint > kvm-all: add kvm_ioctl, kvm_vm_ioctl, kvm_vcpu_ioctl tracepoints > kvm-all: add kvm_run_exit tracepoint > qdev: add qdev_{create,free} tracepoints > qdev-monitor: add device_add tracepoint I'm not sure 4-5 are that useful, but the first 3 patches are definitely good stuff. Paolo