From: Roman Kagan <rkagan@virtuozzo.com>
To: "Li, Liang Z" <liang.z.li@intel.com>
Cc: "ehabkost@redhat.com" <ehabkost@redhat.com>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"qemu-devel@nongnu.org" <qemu-devel@nongnu.org>,
"mst@redhat.com" <mst@redhat.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"Dr. David Alan Gilbert" <dgilbert@redhat.com>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"amit.shah@redhat.com" <amit.shah@redhat.com>,
"pbonzini@redhat.com" <pbonzini@redhat.com>,
"akpm@linux-foundation.org" <akpm@linux-foundation.org>,
"virtualization@lists.linux-foundation.org"
<virtualization@lists.linux-foundation.org>,
"rth@twiddle.net" <rth@twiddle.net>
Subject: Re: [Qemu-devel] [RFC qemu 0/4] A PV solution for live migration optimization
Date: Fri, 4 Mar 2016 11:14:12 +0300 [thread overview]
Message-ID: <20160304081411.GD9100__24592.6719661385$1457079296$gmane$org@rkaganb.sw.ru> (raw)
In-Reply-To: <F2CBF3009FA73547804AE4C663CAB28E03770E33@SHSMSX101.ccr.corp.intel.com>
On Fri, Mar 04, 2016 at 01:52:53AM +0000, Li, Liang Z wrote:
> > I wonder if it would be possible to avoid the kernel changes by parsing
> > /proc/self/pagemap - if that can be used to detect unmapped/zero mapped
> > pages in the guest ram, would it achieve the same result?
>
> Only detect the unmapped/zero mapped pages is not enough. Consider the
> situation like case 2, it can't achieve the same result.
Your case 2 doesn't exist in the real world. If people could stop their
main memory consumer in the guest prior to migration they wouldn't need
live migration at all.
I tend to think you can safely assume there's no free memory in the
guest, so there's little point optimizing for it.
OTOH it makes perfect sense optimizing for the unmapped memory that's
made up, in particular, by the ballon, and consider inflating the
balloon right before migration unless you already maintain it at the
optimal size for other reasons (like e.g. a global resource manager
optimizing the VM density).
Roman.
next prev parent reply other threads:[~2016-03-04 8:14 UTC|newest]
Thread overview: 292+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-03 10:44 [RFC qemu 0/4] A PV solution for live migration optimization Liang Li
2016-03-03 10:44 ` [Qemu-devel] " Liang Li
2016-03-03 10:44 ` Liang Li
2016-03-03 10:44 ` [RFC qemu 1/4] pc: Add code to get the lowmem form PCMachineState Liang Li
2016-03-03 10:44 ` [Qemu-devel] " Liang Li
2016-03-03 10:44 ` Liang Li
2016-03-03 10:44 ` Liang Li
2016-03-03 10:44 ` [RFC qemu 2/4] virtio-balloon: Add a new feature to balloon device Liang Li
2016-03-03 10:44 ` Liang Li
2016-03-03 10:44 ` [Qemu-devel] " Liang Li
2016-03-03 10:44 ` Liang Li
2016-03-03 12:23 ` Cornelia Huck
2016-03-03 12:23 ` Cornelia Huck
2016-03-03 12:23 ` [Qemu-devel] " Cornelia Huck
2016-03-03 12:23 ` Cornelia Huck
2016-03-04 2:38 ` Li, Liang Z
2016-03-04 2:38 ` [Qemu-devel] " Li, Liang Z
2016-03-04 2:38 ` Li, Liang Z
2016-03-04 2:38 ` Li, Liang Z
2016-03-03 12:56 ` Michael S. Tsirkin
2016-03-03 12:56 ` Michael S. Tsirkin
2016-03-03 12:56 ` [Qemu-devel] " Michael S. Tsirkin
2016-03-03 12:56 ` Michael S. Tsirkin
2016-03-04 2:29 ` Li, Liang Z
2016-03-04 2:29 ` [Qemu-devel] " Li, Liang Z
2016-03-04 2:29 ` Li, Liang Z
2016-03-04 2:29 ` Li, Liang Z
2016-03-03 10:44 ` [RFC qemu 3/4] migration: not set migration bitmap in setup stage Liang Li
2016-03-03 10:44 ` [Qemu-devel] " Liang Li
2016-03-03 10:44 ` Liang Li
2016-03-03 10:44 ` Liang Li
2016-03-03 10:44 ` [RFC qemu 4/4] migration: filter out guest's free pages in ram bulk stage Liang Li
2016-03-03 10:44 ` [Qemu-devel] " Liang Li
2016-03-03 10:44 ` Liang Li
2016-03-03 12:16 ` Cornelia Huck
2016-03-03 12:16 ` [Qemu-devel] " Cornelia Huck
2016-03-03 12:16 ` Cornelia Huck
2016-03-03 12:16 ` Cornelia Huck
2016-03-04 2:32 ` Li, Liang Z
2016-03-04 2:32 ` Li, Liang Z
2016-03-04 2:32 ` [Qemu-devel] " Li, Liang Z
2016-03-04 2:32 ` Li, Liang Z
2016-03-04 2:32 ` Li, Liang Z
2016-03-03 12:45 ` [Qemu-devel] " Daniel P. Berrange
2016-03-03 12:45 ` Daniel P. Berrange
2016-03-03 12:45 ` Daniel P. Berrange
2016-03-03 12:45 ` Daniel P. Berrange
2016-03-04 2:43 ` Li, Liang Z
2016-03-04 2:43 ` Li, Liang Z
2016-03-04 2:43 ` Li, Liang Z
2016-03-04 2:43 ` Li, Liang Z
2016-03-03 10:44 ` Liang Li
2016-03-03 13:58 ` [Qemu-devel] [RFC qemu 0/4] A PV solution for live migration optimization Roman Kagan
2016-03-03 13:58 ` Roman Kagan
2016-03-03 13:58 ` Roman Kagan
2016-03-03 13:58 ` Roman Kagan
2016-03-04 1:35 ` Li, Liang Z
2016-03-04 1:35 ` Li, Liang Z
2016-03-04 1:35 ` Li, Liang Z
2016-03-04 1:35 ` Li, Liang Z
2016-03-03 17:46 ` Dr. David Alan Gilbert
2016-03-03 17:46 ` [Qemu-devel] " Dr. David Alan Gilbert
2016-03-03 17:46 ` Dr. David Alan Gilbert
2016-03-04 1:52 ` Li, Liang Z
2016-03-04 1:52 ` [Qemu-devel] " Li, Liang Z
2016-03-04 1:52 ` Li, Liang Z
2016-03-04 1:52 ` Li, Liang Z
2016-03-04 8:14 ` Roman Kagan [this message]
2016-03-04 8:14 ` [Qemu-devel] " Roman Kagan
2016-03-04 8:14 ` Roman Kagan
2016-03-04 8:14 ` Roman Kagan
2016-03-04 9:08 ` Li, Liang Z
2016-03-04 9:08 ` Li, Liang Z
2016-03-04 9:08 ` Li, Liang Z
2016-03-04 10:23 ` Roman Kagan
2016-03-04 10:23 ` Roman Kagan
2016-03-04 10:23 ` Roman Kagan
2016-03-04 14:26 ` Li, Liang Z
2016-03-04 14:26 ` Li, Liang Z
2016-03-04 14:26 ` Li, Liang Z
2016-03-04 14:26 ` Li, Liang Z
2016-03-04 14:45 ` Michael S. Tsirkin
2016-03-04 14:45 ` Michael S. Tsirkin
2016-03-04 14:45 ` Michael S. Tsirkin
2016-03-04 14:45 ` Michael S. Tsirkin
2016-03-04 15:49 ` Li, Liang Z
2016-03-04 15:49 ` Li, Liang Z
2016-03-04 15:49 ` Li, Liang Z
2016-03-04 15:49 ` Li, Liang Z
2016-03-05 19:55 ` Michael S. Tsirkin
2016-03-05 19:55 ` Michael S. Tsirkin
2016-03-05 19:55 ` Michael S. Tsirkin
2016-03-05 19:55 ` Michael S. Tsirkin
2016-03-05 19:55 ` Michael S. Tsirkin
2016-03-07 6:49 ` Li, Liang Z
2016-03-07 6:49 ` Li, Liang Z
2016-03-07 6:49 ` Li, Liang Z
2016-03-07 6:49 ` Li, Liang Z
2016-03-07 11:40 ` Michael S. Tsirkin
2016-03-07 11:40 ` Michael S. Tsirkin
2016-03-07 11:40 ` Michael S. Tsirkin
2016-03-07 11:40 ` Michael S. Tsirkin
2016-03-07 15:06 ` Li, Liang Z
2016-03-07 15:06 ` Li, Liang Z
2016-03-07 15:06 ` Li, Liang Z
2016-03-07 15:06 ` Li, Liang Z
2016-03-09 14:28 ` Roman Kagan
2016-03-09 14:28 ` Roman Kagan
2016-03-09 14:28 ` Roman Kagan
2016-03-09 14:28 ` Roman Kagan
2016-03-09 14:28 ` Roman Kagan
2016-03-09 15:27 ` Li, Liang Z
2016-03-09 15:27 ` Li, Liang Z
2016-03-09 15:27 ` Li, Liang Z
2016-03-09 15:27 ` Li, Liang Z
2016-03-09 15:30 ` Michael S. Tsirkin
2016-03-09 15:30 ` Michael S. Tsirkin
2016-03-09 15:30 ` Michael S. Tsirkin
2016-03-10 1:41 ` Li, Liang Z
2016-03-10 1:41 ` Li, Liang Z
2016-03-10 1:41 ` Li, Liang Z
2016-03-10 1:41 ` Li, Liang Z
2016-03-10 1:41 ` Li, Liang Z
2016-03-10 12:29 ` Michael S. Tsirkin
2016-03-10 12:29 ` Michael S. Tsirkin
2016-03-10 12:29 ` Michael S. Tsirkin
2016-03-10 12:29 ` Michael S. Tsirkin
2016-03-09 15:30 ` Michael S. Tsirkin
2016-03-09 15:41 ` Michael S. Tsirkin
2016-03-09 15:41 ` Michael S. Tsirkin
2016-03-09 15:41 ` Michael S. Tsirkin
2016-03-09 17:04 ` Roman Kagan
2016-03-09 17:04 ` Roman Kagan
2016-03-09 17:04 ` Roman Kagan
2016-03-09 17:04 ` Roman Kagan
2016-03-09 17:04 ` Roman Kagan
2016-03-09 17:39 ` Michael S. Tsirkin
2016-03-09 17:39 ` Michael S. Tsirkin
2016-03-09 17:39 ` Michael S. Tsirkin
2016-03-10 10:21 ` Roman Kagan
2016-03-10 10:21 ` Roman Kagan
2016-03-10 10:21 ` Roman Kagan
2016-03-10 10:21 ` Roman Kagan
2016-03-09 19:38 ` Rik van Riel
2016-03-09 19:38 ` Rik van Riel
2016-03-09 19:38 ` Rik van Riel
2016-03-09 19:38 ` Rik van Riel
2016-03-10 9:30 ` Roman Kagan
2016-03-10 9:30 ` Roman Kagan
2016-03-10 9:30 ` Roman Kagan
2016-03-10 9:30 ` Roman Kagan
2016-03-09 15:41 ` Michael S. Tsirkin
2016-03-07 6:49 ` Li, Liang Z
2016-03-04 16:24 ` Paolo Bonzini
2016-03-04 16:24 ` Paolo Bonzini
2016-03-04 16:24 ` Paolo Bonzini
2016-03-04 16:24 ` Paolo Bonzini
2016-03-04 16:24 ` Paolo Bonzini
2016-03-04 18:51 ` Dr. David Alan Gilbert
2016-03-04 18:51 ` Dr. David Alan Gilbert
2016-03-04 18:51 ` Dr. David Alan Gilbert
2016-03-04 18:51 ` Dr. David Alan Gilbert
2016-03-07 5:34 ` Li, Liang Z
2016-03-07 5:34 ` Li, Liang Z
2016-03-07 5:34 ` Li, Liang Z
2016-03-07 5:34 ` Li, Liang Z
2016-03-07 5:34 ` Li, Liang Z
2016-03-09 13:22 ` Roman Kagan
2016-03-09 13:22 ` Roman Kagan
2016-03-09 13:22 ` Roman Kagan
2016-03-09 14:19 ` Li, Liang Z
2016-03-09 14:19 ` Li, Liang Z
2016-03-09 14:19 ` Li, Liang Z
2016-03-09 14:19 ` Li, Liang Z
2016-03-09 14:19 ` Li, Liang Z
2016-03-09 13:22 ` Roman Kagan
2016-03-09 6:18 ` Li, Liang Z
2016-03-09 6:18 ` Li, Liang Z
2016-03-09 6:18 ` Li, Liang Z
2016-03-09 6:18 ` Li, Liang Z
2016-03-09 6:18 ` Li, Liang Z
2016-03-04 10:23 ` Roman Kagan
2016-03-04 9:08 ` Li, Liang Z
2016-03-04 7:55 ` Roman Kagan
2016-03-04 7:55 ` Roman Kagan
2016-03-04 7:55 ` Roman Kagan
2016-03-04 7:55 ` Roman Kagan
2016-03-04 8:23 ` Li, Liang Z
2016-03-04 8:23 ` Li, Liang Z
2016-03-04 8:23 ` Li, Liang Z
2016-03-04 8:23 ` Li, Liang Z
2016-03-04 8:35 ` Roman Kagan
2016-03-04 8:35 ` Roman Kagan
2016-03-04 8:35 ` Roman Kagan
2016-03-04 9:08 ` Dr. David Alan Gilbert
2016-03-04 9:08 ` Dr. David Alan Gilbert
2016-03-04 9:08 ` Dr. David Alan Gilbert
2016-03-04 9:08 ` Dr. David Alan Gilbert
2016-03-04 9:12 ` Li, Liang Z
2016-03-04 9:12 ` Li, Liang Z
2016-03-04 9:12 ` Li, Liang Z
2016-03-04 9:12 ` Li, Liang Z
2016-03-04 9:47 ` Michael S. Tsirkin
2016-03-04 9:47 ` Michael S. Tsirkin
2016-03-04 9:47 ` Michael S. Tsirkin
2016-03-04 9:47 ` Michael S. Tsirkin
2016-03-04 10:11 ` Li, Liang Z
2016-03-04 10:11 ` Li, Liang Z
2016-03-04 10:11 ` Li, Liang Z
2016-03-04 10:11 ` Li, Liang Z
2016-03-04 10:36 ` Michael S. Tsirkin
2016-03-04 10:36 ` Michael S. Tsirkin
2016-03-04 10:36 ` Michael S. Tsirkin
2016-03-04 10:36 ` Michael S. Tsirkin
2016-03-04 15:13 ` Li, Liang Z
2016-03-04 15:13 ` Li, Liang Z
2016-03-04 15:13 ` Li, Liang Z
2016-03-04 15:13 ` Li, Liang Z
2016-03-08 14:03 ` Michael S. Tsirkin
2016-03-08 14:03 ` Michael S. Tsirkin
2016-03-08 14:03 ` Michael S. Tsirkin
2016-03-08 14:03 ` Michael S. Tsirkin
2016-03-08 14:17 ` Li, Liang Z
2016-03-08 14:17 ` Li, Liang Z
2016-03-08 14:17 ` Li, Liang Z
2016-03-08 14:17 ` Li, Liang Z
2016-03-08 14:17 ` Li, Liang Z
2016-03-08 14:03 ` Michael S. Tsirkin
2016-03-04 9:35 ` Roman Kagan
2016-03-04 9:35 ` Roman Kagan
2016-03-04 9:35 ` Roman Kagan
2016-03-04 9:35 ` Roman Kagan
2016-03-04 8:35 ` Roman Kagan
2016-03-04 7:55 ` Roman Kagan
2016-03-03 17:46 ` Dr. David Alan Gilbert
2016-03-08 11:13 ` Amit Shah
2016-03-08 11:13 ` [Qemu-devel] " Amit Shah
2016-03-08 11:13 ` Amit Shah
2016-03-08 11:13 ` Amit Shah
2016-03-08 13:11 ` Li, Liang Z
2016-03-08 13:11 ` Li, Liang Z
2016-03-08 13:11 ` [Qemu-devel] " Li, Liang Z
2016-03-08 13:11 ` Li, Liang Z
2016-03-10 7:44 ` Li, Liang Z
2016-03-10 7:44 ` Li, Liang Z
2016-03-10 7:44 ` [Qemu-devel] " Li, Liang Z
2016-03-10 7:44 ` Li, Liang Z
2016-03-10 7:57 ` Amit Shah
2016-03-10 7:57 ` Amit Shah
2016-03-10 7:57 ` [Qemu-devel] " Amit Shah
2016-03-10 7:57 ` Amit Shah
2016-03-10 8:36 ` Li, Liang Z
2016-03-10 8:36 ` [Qemu-devel] " Li, Liang Z
2016-03-10 8:36 ` Li, Liang Z
2016-03-10 11:18 ` Dr. David Alan Gilbert
2016-03-10 11:18 ` Dr. David Alan Gilbert
2016-03-10 11:18 ` [Qemu-devel] " Dr. David Alan Gilbert
2016-03-10 11:18 ` Dr. David Alan Gilbert
2016-03-11 2:38 ` Li, Liang Z
2016-03-11 2:38 ` [Qemu-devel] " Li, Liang Z
2016-03-11 2:38 ` Li, Liang Z
2016-03-14 17:03 ` Dr. David Alan Gilbert
2016-03-14 17:03 ` Dr. David Alan Gilbert
2016-03-14 17:03 ` [Qemu-devel] " Dr. David Alan Gilbert
2016-03-14 17:03 ` Dr. David Alan Gilbert
2016-03-14 17:03 ` Dr. David Alan Gilbert
2016-03-15 3:31 ` Li, Liang Z
2016-03-15 3:31 ` [Qemu-devel] " Li, Liang Z
2016-03-15 3:31 ` Li, Liang Z
2016-03-15 3:31 ` Li, Liang Z
2016-03-15 3:31 ` Li, Liang Z
2016-03-15 10:29 ` Michael S. Tsirkin
2016-03-15 10:29 ` Michael S. Tsirkin
2016-03-15 10:29 ` [Qemu-devel] " Michael S. Tsirkin
2016-03-15 10:29 ` Michael S. Tsirkin
2016-03-15 11:11 ` Li, Liang Z
2016-03-15 11:11 ` [Qemu-devel] " Li, Liang Z
2016-03-15 11:11 ` Li, Liang Z
2016-03-15 11:11 ` Li, Liang Z
2016-03-15 19:55 ` Dr. David Alan Gilbert
2016-03-15 19:55 ` [Qemu-devel] " Dr. David Alan Gilbert
2016-03-15 19:55 ` Dr. David Alan Gilbert
2016-03-15 19:55 ` Dr. David Alan Gilbert
2016-03-16 1:20 ` Li, Liang Z
2016-03-16 1:20 ` [Qemu-devel] " Li, Liang Z
2016-03-16 1:20 ` Li, Liang Z
2016-03-16 1:20 ` Li, Liang Z
2016-03-11 2:38 ` Li, Liang Z
2016-03-10 8:36 ` Li, Liang Z
2016-03-04 9:32 [Qemu-devel] " Jitendra Kolhe
2016-03-04 9:36 ` Li, Liang Z
2016-03-08 11:14 ` Amit Shah
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