From: Avi Kivity <avi@qumranet.com>
To: qemu-devel@nongnu.org
Cc: Glauber Costa <glommer@gmail.com>,
Chris Wright <chrisw@redhat.com>,
Uri Lublin <uri.lublin@qumranet.com>,
kvm@vger.kernel.org
Subject: Re: [Qemu-devel] [PATCH 3/10] Add bdrv_flush_all()
Date: Wed, 10 Sep 2008 18:39:47 +0300 [thread overview]
Message-ID: <48C7EA43.5010102@qumranet.com> (raw)
In-Reply-To: <48C7E579.5040702@us.ibm.com>
Anthony Liguori wrote:
>
> I'm actually liking bdrv_flush_all() less and less. If there are any
> outstanding IO requests, it will increase the down time associated
> with live migration. I think we definitely need to add a live save
> handler that waits until there are no outstanding IO requests to
> converge. I'm concerned though that it's not totally unreasonable to
> expect a guest to always have an IO request in flight.
I/O requests should complete in milliseconds; I don't see them as
increasing migration latency.
> That leads me to think that maybe we should be cancelling outstanding
> requests, and somehow saving their state?
Migration is enough of a special case that we should avoid special cases
within it as much as possible.
--
error compiling committee.c: too many arguments to function
WARNING: multiple messages have this Message-ID (diff)
From: Avi Kivity <avi@qumranet.com>
To: qemu-devel@nongnu.org
Cc: Chris Wright <chrisw@redhat.com>,
Glauber Costa <glommer@gmail.com>,
kvm@vger.kernel.org, Uri Lublin <uri.lublin@qumranet.com>
Subject: Re: [Qemu-devel] [PATCH 3/10] Add bdrv_flush_all()
Date: Wed, 10 Sep 2008 18:39:47 +0300 [thread overview]
Message-ID: <48C7EA43.5010102@qumranet.com> (raw)
In-Reply-To: <48C7E579.5040702@us.ibm.com>
Anthony Liguori wrote:
>
> I'm actually liking bdrv_flush_all() less and less. If there are any
> outstanding IO requests, it will increase the down time associated
> with live migration. I think we definitely need to add a live save
> handler that waits until there are no outstanding IO requests to
> converge. I'm concerned though that it's not totally unreasonable to
> expect a guest to always have an IO request in flight.
I/O requests should complete in milliseconds; I don't see them as
increasing migration latency.
> That leads me to think that maybe we should be cancelling outstanding
> requests, and somehow saving their state?
Migration is enough of a special case that we should avoid special cases
within it as much as possible.
--
error compiling committee.c: too many arguments to function
next prev parent reply other threads:[~2008-09-10 15:39 UTC|newest]
Thread overview: 95+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-09-09 19:49 [PATCH 0/10] Live migration for QEMU Anthony Liguori
2008-09-09 19:49 ` [Qemu-devel] " Anthony Liguori
2008-09-09 19:49 ` [PATCH 1/10] Refactor QEMUFile for live migration Anthony Liguori
2008-09-09 19:49 ` [Qemu-devel] " Anthony Liguori
2008-09-10 13:25 ` Chris Lalancette
2008-09-10 14:38 ` Glauber Costa
2008-09-10 14:38 ` [Qemu-devel] " Glauber Costa
2008-09-10 15:05 ` Avi Kivity
2008-09-10 15:05 ` Avi Kivity
2008-09-10 15:16 ` Anthony Liguori
2008-09-10 15:16 ` [Qemu-devel] " Anthony Liguori
2008-09-12 15:40 ` [Qemu-devel] " Blue Swirl
2008-09-09 19:49 ` [PATCH 2/10] Allow the monitor to be suspended during non-blocking op Anthony Liguori
2008-09-09 19:49 ` [Qemu-devel] " Anthony Liguori
2008-09-10 6:52 ` Avi Kivity
2008-09-10 10:05 ` Daniel P. Berrange
2008-09-10 10:05 ` Daniel P. Berrange
2008-09-10 11:11 ` Avi Kivity
2008-09-10 11:11 ` Avi Kivity
2008-09-10 11:14 ` Daniel P. Berrange
2008-09-10 11:14 ` Daniel P. Berrange
2008-09-10 15:36 ` Avi Kivity
2008-09-10 15:36 ` Avi Kivity
2008-09-10 15:40 ` Anthony Liguori
2008-09-10 15:40 ` Anthony Liguori
2008-09-10 15:58 ` Jamie Lokier
2008-09-10 15:58 ` Jamie Lokier
2008-09-11 10:16 ` Avi Kivity
2008-09-11 11:59 ` Jamie Lokier
2008-09-10 13:07 ` Anthony Liguori
2008-09-10 13:07 ` Anthony Liguori
2008-09-10 13:26 ` Chris Lalancette
2008-09-10 13:26 ` Chris Lalancette
2008-09-10 10:01 ` Daniel P. Berrange
2008-09-10 13:11 ` Anthony Liguori
2008-09-10 13:11 ` Anthony Liguori
2008-09-09 19:49 ` [PATCH 3/10] Add bdrv_flush_all() Anthony Liguori
2008-09-09 19:49 ` [Qemu-devel] " Anthony Liguori
2008-09-10 13:26 ` Chris Lalancette
2008-09-10 13:26 ` [Qemu-devel] " Chris Lalancette
2008-09-10 14:46 ` Glauber Costa
2008-09-10 15:19 ` Anthony Liguori
2008-09-10 15:19 ` Anthony Liguori
2008-09-10 15:32 ` Glauber Costa
2008-09-10 15:32 ` Glauber Costa
2008-09-10 15:39 ` Avi Kivity [this message]
2008-09-10 15:39 ` Avi Kivity
2008-09-10 16:37 ` Paul Brook
2008-09-10 16:37 ` Paul Brook
2008-09-12 15:43 ` Blue Swirl
2008-09-09 19:49 ` [PATCH 4/10] Add dirty tracking for live migration Anthony Liguori
2008-09-09 19:49 ` [Qemu-devel] " Anthony Liguori
2008-09-10 14:52 ` Glauber Costa
2008-09-10 14:56 ` Anthony Liguori
2008-09-10 14:56 ` Anthony Liguori
2008-09-10 15:01 ` Glauber Costa
2008-09-10 15:01 ` Glauber Costa
2008-09-09 19:49 ` [PATCH 5/10] Add network announce function Anthony Liguori
2008-09-09 19:49 ` [Qemu-devel] " Anthony Liguori
2008-09-10 13:27 ` Chris Lalancette
2008-09-10 13:54 ` Anthony Liguori
2008-09-10 13:54 ` Anthony Liguori
2008-09-10 14:00 ` Avi Kivity
2008-09-09 19:49 ` [PATCH 6/10] Introduce v3 of savevm protocol Anthony Liguori
2008-09-09 19:49 ` [Qemu-devel] " Anthony Liguori
2008-09-10 7:09 ` Avi Kivity
2008-09-09 19:49 ` [PATCH 7/10] Switch the memory savevm handler to be "live" Anthony Liguori
2008-09-09 19:49 ` [Qemu-devel] " Anthony Liguori
2008-09-09 22:25 ` Jamie Lokier
2008-09-09 22:49 ` Anthony Liguori
2008-09-09 22:49 ` Anthony Liguori
2008-09-10 7:17 ` Avi Kivity
2008-09-10 13:10 ` Anthony Liguori
2008-09-10 13:10 ` Anthony Liguori
2008-09-09 19:50 ` [PATCH 8/10] Introduce a buffered QEMUFile wrapper Anthony Liguori
2008-09-09 19:50 ` [Qemu-devel] " Anthony Liguori
2008-09-12 15:16 ` Blue Swirl
2008-09-09 19:50 ` [PATCH 9/10] Introduce the UI components for live migration Anthony Liguori
2008-09-09 19:50 ` [Qemu-devel] " Anthony Liguori
2008-09-09 19:50 ` [PATCH 10/10] TCP based " Anthony Liguori
2008-09-09 19:50 ` [Qemu-devel] " Anthony Liguori
2008-09-10 16:46 ` Blue Swirl
2008-09-10 16:51 ` Anthony Liguori
2008-09-10 16:51 ` Anthony Liguori
2008-09-11 12:13 ` [Qemu-devel] [PATCH 0/10] Live migration for QEMU Atsushi SAKAI
2008-09-11 13:06 ` Anthony Liguori
2008-09-11 13:30 ` Jamie Lokier
2008-09-11 14:12 ` Anthony Liguori
2008-09-11 14:12 ` Anthony Liguori
2008-09-11 15:32 ` Avi Kivity
2008-09-11 15:32 ` Avi Kivity
2008-09-11 16:22 ` Anthony Liguori
2008-09-11 16:22 ` Anthony Liguori
2008-09-11 16:32 ` Avi Kivity
2008-09-11 16:32 ` Avi Kivity
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=48C7EA43.5010102@qumranet.com \
--to=avi@qumranet.com \
--cc=chrisw@redhat.com \
--cc=glommer@gmail.com \
--cc=kvm@vger.kernel.org \
--cc=qemu-devel@nongnu.org \
--cc=uri.lublin@qumranet.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.