From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:37461) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bsDGC-0006J2-Fr for qemu-devel@nongnu.org; Thu, 06 Oct 2016 14:19:13 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1bsDGB-0007GJ-Et for qemu-devel@nongnu.org; Thu, 06 Oct 2016 14:19:12 -0400 References: <1475272849-19990-1-git-send-email-jsnow@redhat.com> <1475272849-19990-3-git-send-email-jsnow@redhat.com> <20161005134312.GA1657@noname.str.redhat.com> <0e9d9739-b32b-8cff-3e34-ccc8e971b4c3@redhat.com> <20161006074427.GA5188@noname.redhat.com> <106ae611-da25-b700-d7c7-b8c3d5434c91@redhat.com> From: John Snow Message-ID: Date: Thu, 6 Oct 2016 14:19:02 -0400 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] [PATCH v2 02/11] blockjob: centralize QMP event emissions List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Eric Blake , Kevin Wolf Cc: vsementsov@virtuozzo.com, famz@redhat.com, qemu-block@nongnu.org, jcody@redhat.com, qemu-devel@nongnu.org, stefanha@redhat.com, Wen Congyang On 10/06/2016 02:16 PM, Eric Blake wrote: > On 10/06/2016 11:57 AM, John Snow wrote: >> Mirrors "internal bitmaps," too. >> >> I can rig it such that if a job has no ID, it will cease to show up via >> query and no longer emit events. >> >> Downside: Whether or not a device is busy or can accept another job >> becomes opaque to the management layer. > > A bit, but isn't the point of this exercise to ultimately reach the > point where we can support multiple simultaneous jobs, so long as > op-blockers prove the jobs don't collide? > Yes, exactly. It's only a temporary drawback. If libvirt can cope for now, I am happy.