From: Eduardo Habkost <ehabkost@redhat.com>
To: Luiz Capitulino <lcapitulino@redhat.com>
Cc: "Daniel P. Berrangé" <berrange@redhat.com>,
"Viktor Mihajlovski" <mihajlov@linux.vnet.ibm.com>,
"Radim Krčmář" <rkrcmar@redhat.com>,
kvm@vger.kernel.org, pbonzini@redhat.com,
"Peter Krempa" <pkrempa@redhat.com>,
"John Ferlan" <jferlan@redhat.com>,
libvir-list@redhat.com,
"Christian Borntraeger" <borntraeger@de.ibm.com>,
qemu-devel@nongnu.org, "Markus Armbruster" <armbru@redhat.com>,
"Eric Blake" <eblake@redhat.com>
Subject: Re: [RFC] kvm: x86: export vCPU halted state to sysfs
Date: Fri, 2 Feb 2018 12:50:14 -0200 [thread overview]
Message-ID: <20180202145014.GI26425@localhost.localdomain> (raw)
In-Reply-To: <20180202092159.48d9bd4c@redhat.com>
(CCing qemu-devel)
On Fri, Feb 02, 2018 at 09:21:59AM -0500, Luiz Capitulino wrote:
> On Fri, 2 Feb 2018 14:19:38 +0000
> Daniel P. Berrangé <berrange@redhat.com> wrote:
> > On Fri, Feb 02, 2018 at 12:15:54PM -0200, Eduardo Habkost wrote:
[...]
> > > It would be also interesting to update QEMU QMP documentation to
> > > clarify the arch-specific semantics of "halted".
> >
> > Any also especially clarify the awful performance implications of running
> > this particular query command. In general I would not expect query-xxx
> > monitor commands to interrupt all vcpus, so we should clearly warn about
> > this !
>
> Or deprecate it...
We could deprecate the expensive fields on query-cpus, and move
them to a more expensive query-cpu-state command. I believe most
users of query-cpus are only interested in qom_path, thread_id,
and topology info.
Markus, Eric: from the QAPI point of view, is it OK to remove
fields between QEMU versions, as long as we follow our
deprecation policy?
--
Eduardo
next prev parent reply other threads:[~2018-02-02 14:50 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-01 17:54 [RFC] kvm: x86: export vCPU halted state to sysfs Luiz Capitulino
2018-02-01 20:15 ` Radim Krčmář
2018-02-01 20:26 ` Eduardo Habkost
2018-02-02 13:53 ` Viktor Mihajlovski
2018-02-02 14:14 ` Luiz Capitulino
2018-02-02 14:15 ` Eduardo Habkost
2018-02-02 14:19 ` Daniel P. Berrangé
2018-02-02 14:21 ` Luiz Capitulino
2018-02-02 14:50 ` Eduardo Habkost [this message]
2018-02-02 14:55 ` [libvirt] " Luiz Capitulino
2018-02-02 15:07 ` Daniel P. Berrangé
2018-02-02 15:25 ` Eduardo Habkost
2018-02-02 16:23 ` [libvirt] " Eric Blake
2018-02-02 15:19 ` Eric Blake
2018-02-02 17:23 ` [Qemu-devel] " Dr. David Alan Gilbert
2018-02-02 17:38 ` Eduardo Habkost
2018-02-02 15:08 ` Viktor Mihajlovski
2018-02-02 15:22 ` [libvirt] " Luiz Capitulino
2018-02-02 15:51 ` Viktor Mihajlovski
2018-02-02 15:54 ` Daniel P. Berrangé
2018-02-02 16:01 ` Luiz Capitulino
2018-02-02 16:07 ` Luiz Capitulino
2018-02-02 16:19 ` Viktor Mihajlovski
2018-02-02 17:42 ` [libvirt] " Eduardo Habkost
2018-02-02 18:50 ` Luiz Capitulino
2018-02-02 20:09 ` Eduardo Habkost
2018-02-02 20:19 ` [libvirt] " Luiz Capitulino
2018-02-02 20:41 ` Eduardo Habkost
2018-02-02 21:49 ` Luiz Capitulino
2018-02-02 21:54 ` Luiz Capitulino
2018-02-05 13:43 ` Viktor Mihajlovski
2018-02-05 13:47 ` Daniel P. Berrangé
2018-02-05 15:37 ` Luiz Capitulino
2018-02-05 16:10 ` Viktor Mihajlovski
2018-02-05 16:36 ` Luiz Capitulino
2018-02-05 22:50 ` Eduardo Habkost
2018-02-06 2:04 ` Luiz Capitulino
2018-02-02 15:55 ` [libvirt] " Luiz Capitulino
2018-02-06 10:29 ` Viktor Mihajlovski
2018-02-06 14:05 ` Luiz Capitulino
2018-02-02 12:47 ` Daniel P. Berrangé
2018-02-02 13:46 ` Luiz Capitulino
2018-02-02 12:49 ` Daniel P. Berrangé
2018-02-02 13:49 ` Luiz Capitulino
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