From: Avi Kivity <avi@redhat.com>
To: Anthony Liguori <anthony@codemonkey.ws>
Cc: Libvirt <libvir-list@redhat.com>,
Jiri Denemark <jdenemar@redhat.com>,
Chris Lalancette <clalance@redhat.com>,
qemu-devel@nongnu.org, Luiz Capitulino <lcapitulino@redhat.com>
Subject: Re: [Qemu-devel] Re: [libvirt] Libvirt debug API
Date: Fri, 23 Apr 2010 15:48:27 +0300 [thread overview]
Message-ID: <4BD1971B.7060907@redhat.com> (raw)
In-Reply-To: <4BD09A3B.3090001@codemonkey.ws>
On 04/22/2010 09:49 PM, Anthony Liguori wrote:
>> real API. Say, adding a device libvirt doesn't know about or stopping
>> the VM
>> while libvirt thinks it's still running or anything like that.
> Another problem is issuing Monitor commands that could confuse
> libvirt's
>
> We need to make libvirt and qemu smarter.
>
> We already face this problem today with multiple libvirt users. This
> is why sophisticated management mechanisms (like LDAP) have mechanisms
> to do transactions or at least a series of atomic operations.
And people said qmp/json was overengineered...
But seriously, transactions won't help anything. qemu maintains state,
and when you have two updaters touching a shared variable not excepting
each other to, things break, no matter how much locking there is. The
only way that separate monitors could work is if they touch completely
separate state, which is difficult to ensure if you upgrade your libvirt.
--
Do not meddle in the internals of kernels, for they are subtle and quick to panic.
next prev parent reply other threads:[~2010-04-23 12:48 UTC|newest]
Thread overview: 66+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-09 13:41 [Qemu-devel] Libvirt debug API Chris Lalancette
2010-04-09 14:27 ` [Qemu-devel] Re: [libvirt] " Daniel P. Berrange
2010-04-09 18:16 ` Chris Lalancette
2010-04-12 12:41 ` Daniel P. Berrange
2010-04-12 13:56 ` Chris Lalancette
2010-04-12 14:18 ` Daniel P. Berrange
2010-04-09 21:06 ` Jamie Lokier
2010-04-09 21:30 ` [libvirt] [Qemu-devel] " Eric Blake
2010-04-10 12:05 ` Paolo Bonzini
2010-04-11 20:28 ` [Qemu-devel] Re: [libvirt] " Richard W.M. Jones
2010-04-11 22:17 ` Jamie Lokier
[not found] ` <20100412085621.GN26162@redhat.com>
2010-04-12 12:23 ` [libvirt] [Qemu-devel] " Jamie Lokier
2010-04-12 13:05 ` Daniel P. Berrange
2010-04-22 18:47 ` Anthony Liguori
2010-04-23 6:36 ` Jes Sorensen
2010-04-23 10:30 ` Daniel P. Berrange
2010-04-12 12:53 ` [Qemu-devel] Re: [libvirt] " Daniel P. Berrange
2010-04-12 15:20 ` Luiz Capitulino
2010-04-22 18:49 ` Anthony Liguori
2010-04-23 12:48 ` Avi Kivity [this message]
2010-04-23 13:48 ` Anthony Liguori
2010-04-23 14:24 ` Avi Kivity
2010-04-23 14:36 ` [libvirt] [Qemu-devel] " Daniel P. Berrange
2010-04-26 12:54 ` Jamie Lokier
2010-04-26 14:25 ` Chris Lalancette
2010-04-26 14:34 ` Avi Kivity
2010-04-26 14:54 ` Daniel P. Berrange
2010-04-26 15:08 ` Anthony Liguori
2010-04-26 15:20 ` Daniel P. Berrange
2010-04-26 15:55 ` Anthony Liguori
2010-04-23 18:29 ` [Qemu-devel] Re: [libvirt] " Anthony Liguori
2010-04-24 9:46 ` Avi Kivity
2010-04-25 3:39 ` Anthony Liguori
2010-04-25 11:51 ` Avi Kivity
2010-04-26 1:53 ` Anthony Liguori
2010-04-26 5:56 ` Avi Kivity
2010-04-26 9:56 ` [libvirt] [Qemu-devel] " Matthias Bolte
2010-04-26 13:14 ` [Qemu-devel] Re: [libvirt] " Anthony Liguori
2010-04-26 13:41 ` Avi Kivity
2010-04-26 13:46 ` Anthony Liguori
2010-04-26 13:53 ` Avi Kivity
2010-04-26 13:58 ` Daniel P. Berrange
2010-04-26 14:26 ` Anthony Liguori
2010-04-26 14:32 ` Daniel P. Berrange
2010-04-26 9:59 ` Daniel P. Berrange
2010-04-26 13:13 ` Anthony Liguori
2010-04-26 13:31 ` Daniel P. Berrange
2010-04-26 13:43 ` Anthony Liguori
2010-04-26 14:01 ` Avi Kivity
2010-04-26 14:19 ` Anthony Liguori
2010-04-26 14:25 ` Avi Kivity
2010-04-26 14:28 ` Anthony Liguori
2010-04-26 14:38 ` Avi Kivity
2010-04-26 14:48 ` Anthony Liguori
2010-04-26 14:51 ` Avi Kivity
2010-04-23 14:34 ` Daniel P. Berrange
2010-04-23 15:43 ` Markus Armbruster
2010-04-22 18:45 ` Anthony Liguori
2010-04-22 19:10 ` Anthony Liguori
2010-04-23 10:28 ` Daniel P. Berrange
2010-04-23 13:40 ` Anthony Liguori
2010-04-23 14:21 ` Daniel P. Berrange
2010-04-23 18:33 ` Anthony Liguori
2010-04-25 14:50 ` Avi Kivity
2010-04-26 13:14 ` Anthony Liguori
2010-04-09 20:07 ` Eric Blake
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