From: "Michael S. Tsirkin" <mst@redhat.com>
To: "Li, Liang Z" <liang.z.li@intel.com>
Cc: "Dr. David Alan Gilbert" <dgilbert@redhat.com>,
Wei Yang <richard.weiyang@huawei.com>,
"qemu-devel@nongnu.org" <qemu-devel@nongnu.org>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"linux-kernel@vger.kenel.org" <linux-kernel@vger.kenel.org>,
"pbonzini@redhat.com" <pbonzini@redhat.com>,
"rth@twiddle.net" <rth@twiddle.net>,
"ehabkost@redhat.com" <ehabkost@redhat.com>,
"amit.shah@redhat.com" <amit.shah@redhat.com>,
"quintela@redhat.com" <quintela@redhat.com>,
"mohan_parthasarathy@hpe.com" <mohan_parthasarathy@hpe.com>,
"jitendra.kolhe@hpe.com" <jitendra.kolhe@hpe.com>,
"simhan@hpe.com" <simhan@hpe.com>,
"rkagan@virtuozzo.com" <rkagan@virtuozzo.com>,
"riel@redhat.com" <riel@redhat.com>
Subject: Re: [RFC Design Doc]Speed up live migration by skipping free pages
Date: Mon, 18 Apr 2016 14:29:25 +0300 [thread overview]
Message-ID: <20160418142704-mutt-send-email-mst@redhat.com> (raw)
In-Reply-To: <F2CBF3009FA73547804AE4C663CAB28E04181432@shsmsx102.ccr.corp.intel.com>
On Mon, Apr 18, 2016 at 11:08:31AM +0000, Li, Liang Z wrote:
> Hi Dave,
>
> I am now working on how to benefit post-copy by skipping the free pages,
> and I remember you have said we should let the destination know the info
> of free pages so as to avoid request the free pages from the source.
>
> We have two solutions:
>
> a. send the migration dirty page bitmap to destination before post
> copy start, so the destination can decide whether to request the pages or
> place zero pages by checking the migration dirty page bitmap. The advantage
> is that we can avoid sending the free pages. the disadvantage is that we have
> to send extra data to destination.
>
> b. Check the page request on the source side, if it's not a dirty page, send a zero
> page header to the destination.
>
> What's your opinion about them?
>
> Liang
>
Both are ad-hoc solutions imho.
c. put the bitmap in a ramblock, check it on destination before
requesting pages.
This way it's migrated on-demand.
--
MST
WARNING: multiple messages have this Message-ID (diff)
From: "Michael S. Tsirkin" <mst@redhat.com>
To: "Li, Liang Z" <liang.z.li@intel.com>
Cc: "Dr. David Alan Gilbert" <dgilbert@redhat.com>,
Wei Yang <richard.weiyang@huawei.com>,
"qemu-devel@nongnu.org" <qemu-devel@nongnu.org>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"linux-kernel@vger.kenel.org" <linux-kernel@vger.kenel.org>,
"pbonzini@redhat.com" <pbonzini@redhat.com>,
"rth@twiddle.net" <rth@twiddle.net>,
"ehabkost@redhat.com" <ehabkost@redhat.com>,
"amit.shah@redhat.com" <amit.shah@redhat.com>,
"quintela@redhat.com" <quintela@redhat.com>,
"mohan_parthasarathy@hpe.com" <mohan_parthasarathy@hpe.com>,
"jitendra.kolhe@hpe.com" <jitendra.kolhe@hpe.com>,
"simhan@hpe.com" <simhan@hpe.com>,
"rkagan@virtuozzo.com" <rkagan@virtuozzo.com>,
"riel@redhat.com" <riel@redhat.com>
Subject: Re: [Qemu-devel] [RFC Design Doc]Speed up live migration by skipping free pages
Date: Mon, 18 Apr 2016 14:29:25 +0300 [thread overview]
Message-ID: <20160418142704-mutt-send-email-mst@redhat.com> (raw)
In-Reply-To: <F2CBF3009FA73547804AE4C663CAB28E04181432@shsmsx102.ccr.corp.intel.com>
On Mon, Apr 18, 2016 at 11:08:31AM +0000, Li, Liang Z wrote:
> Hi Dave,
>
> I am now working on how to benefit post-copy by skipping the free pages,
> and I remember you have said we should let the destination know the info
> of free pages so as to avoid request the free pages from the source.
>
> We have two solutions:
>
> a. send the migration dirty page bitmap to destination before post
> copy start, so the destination can decide whether to request the pages or
> place zero pages by checking the migration dirty page bitmap. The advantage
> is that we can avoid sending the free pages. the disadvantage is that we have
> to send extra data to destination.
>
> b. Check the page request on the source side, if it's not a dirty page, send a zero
> page header to the destination.
>
> What's your opinion about them?
>
> Liang
>
Both are ad-hoc solutions imho.
c. put the bitmap in a ramblock, check it on destination before
requesting pages.
This way it's migrated on-demand.
--
MST
next prev parent reply other threads:[~2016-04-18 11:29 UTC|newest]
Thread overview: 112+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-22 7:43 [RFC Design Doc]Speed up live migration by skipping free pages Liang Li
2016-03-22 7:43 ` [Qemu-devel] " Liang Li
2016-03-22 10:11 ` Michael S. Tsirkin
2016-03-22 10:11 ` [Qemu-devel] " Michael S. Tsirkin
2016-03-23 6:05 ` Li, Liang Z
2016-03-23 6:05 ` [Qemu-devel] " Li, Liang Z
2016-03-23 14:08 ` Michael S. Tsirkin
2016-03-23 14:08 ` [Qemu-devel] " Michael S. Tsirkin
2016-03-24 1:19 ` Li, Liang Z
2016-03-24 1:19 ` [Qemu-devel] " Li, Liang Z
2016-03-24 9:48 ` Michael S. Tsirkin
2016-03-24 9:48 ` [Qemu-devel] " Michael S. Tsirkin
2016-03-24 10:16 ` Li, Liang Z
2016-03-24 10:16 ` [Qemu-devel] " Li, Liang Z
2016-03-24 10:29 ` Michael S. Tsirkin
2016-03-24 10:29 ` [Qemu-devel] " Michael S. Tsirkin
2016-03-24 14:33 ` Li, Liang Z
2016-03-24 14:33 ` [Qemu-devel] " Li, Liang Z
2016-03-24 14:44 ` Michael S. Tsirkin
2016-03-24 14:44 ` [Qemu-devel] " Michael S. Tsirkin
2016-03-24 15:16 ` Li, Liang Z
2016-03-24 15:16 ` [Qemu-devel] " Li, Liang Z
2016-03-24 15:18 ` Paolo Bonzini
2016-03-24 15:18 ` [Qemu-devel] " Paolo Bonzini
2016-03-24 15:25 ` Li, Liang Z
2016-03-24 15:25 ` [Qemu-devel] " Li, Liang Z
2016-03-24 15:27 ` Michael S. Tsirkin
2016-03-24 15:27 ` [Qemu-devel] " Michael S. Tsirkin
2016-03-24 15:39 ` Li, Liang Z
2016-03-24 15:39 ` [Qemu-devel] " Li, Liang Z
2016-03-24 15:47 ` Paolo Bonzini
2016-03-24 15:47 ` [Qemu-devel] " Paolo Bonzini
2016-03-24 15:59 ` Li, Liang Z
2016-03-24 15:59 ` [Qemu-devel] " Li, Liang Z
2016-03-22 19:05 ` Dr. David Alan Gilbert
2016-03-22 19:05 ` [Qemu-devel] " Dr. David Alan Gilbert
2016-03-23 6:48 ` Li, Liang Z
2016-03-23 6:48 ` [Qemu-devel] " Li, Liang Z
2016-03-24 1:24 ` Wei Yang
2016-03-24 1:24 ` [Qemu-devel] " Wei Yang
2016-03-24 9:00 ` Dr. David Alan Gilbert
2016-03-24 9:00 ` [Qemu-devel] " Dr. David Alan Gilbert
2016-03-24 10:09 ` Li, Liang Z
2016-03-24 10:09 ` [Qemu-devel] " Li, Liang Z
2016-03-24 10:23 ` Dr. David Alan Gilbert
2016-03-24 10:23 ` [Qemu-devel] " Dr. David Alan Gilbert
2016-03-24 14:50 ` Li, Liang Z
2016-03-24 14:50 ` [Qemu-devel] " Li, Liang Z
2016-03-24 15:11 ` Michael S. Tsirkin
2016-03-24 15:11 ` [Qemu-devel] " Michael S. Tsirkin
2016-03-24 15:53 ` Li, Liang Z
2016-03-24 15:53 ` [Qemu-devel] " Li, Liang Z
2016-03-24 15:56 ` Michael S. Tsirkin
2016-03-24 15:56 ` [Qemu-devel] " Michael S. Tsirkin
2016-03-24 16:05 ` Li, Liang Z
2016-03-24 16:05 ` [Qemu-devel] " Li, Liang Z
2016-03-24 16:25 ` Michael S. Tsirkin
2016-03-24 16:25 ` [Qemu-devel] " Michael S. Tsirkin
2016-03-24 17:49 ` Dr. David Alan Gilbert
2016-03-24 17:49 ` [Qemu-devel] " Dr. David Alan Gilbert
2016-03-24 22:16 ` Michael S. Tsirkin
2016-03-24 22:16 ` [Qemu-devel] " Michael S. Tsirkin
2016-03-25 1:59 ` Li, Liang Z
2016-03-25 1:59 ` [Qemu-devel] " Li, Liang Z
2016-03-25 1:32 ` Li, Liang Z
2016-03-25 1:32 ` [Qemu-devel] " Li, Liang Z
2016-04-18 11:08 ` Li, Liang Z
2016-04-18 11:08 ` [Qemu-devel] " Li, Liang Z
2016-04-18 11:29 ` Michael S. Tsirkin [this message]
2016-04-18 11:29 ` Michael S. Tsirkin
2016-04-18 14:36 ` Li, Liang Z
2016-04-18 14:36 ` [Qemu-devel] " Li, Liang Z
2016-04-18 15:38 ` Michael S. Tsirkin
2016-04-18 15:38 ` [Qemu-devel] " Michael S. Tsirkin
2016-04-19 2:20 ` Li, Liang Z
2016-04-19 2:20 ` [Qemu-devel] " Li, Liang Z
2016-04-19 19:12 ` Dr. David Alan Gilbert
2016-04-19 19:12 ` [Qemu-devel] " Dr. David Alan Gilbert
2016-04-25 10:56 ` Michael S. Tsirkin
2016-04-25 10:56 ` [Qemu-devel] " Michael S. Tsirkin
2016-04-19 19:05 ` Dr. David Alan Gilbert
2016-04-19 19:05 ` [Qemu-devel] " Dr. David Alan Gilbert
2016-04-20 3:22 ` Li, Liang Z
2016-04-20 3:22 ` [Qemu-devel] " Li, Liang Z
2016-04-20 8:10 ` Dr. David Alan Gilbert
2016-04-20 8:10 ` [Qemu-devel] " Dr. David Alan Gilbert
2016-03-25 1:32 ` Li, Liang Z
2016-03-25 1:32 ` [Qemu-devel] " Li, Liang Z
2016-04-01 10:54 ` Amit Shah
2016-04-01 10:54 ` [Qemu-devel] " Amit Shah
2016-04-05 1:49 ` Li, Liang Z
2016-04-05 1:49 ` [Qemu-devel] " Li, Liang Z
2016-03-23 1:37 ` Wei Yang
2016-03-23 1:37 ` [Qemu-devel] " Wei Yang
2016-03-23 7:18 ` Li, Liang Z
2016-03-23 7:18 ` [Qemu-devel] " Li, Liang Z
2016-03-23 9:46 ` Wei Yang
2016-03-23 9:46 ` [Qemu-devel] " Wei Yang
2016-03-23 14:35 ` Li, Liang Z
2016-03-23 14:35 ` [Qemu-devel] " Li, Liang Z
2016-03-24 0:52 ` Wei Yang
2016-03-24 0:52 ` [Qemu-devel] " Wei Yang
2016-03-24 1:32 ` Li, Liang Z
2016-03-24 1:32 ` [Qemu-devel] " Li, Liang Z
2016-03-24 1:56 ` Wei Yang
2016-03-24 1:56 ` [Qemu-devel] " Wei Yang
2016-03-23 16:53 ` Eric Blake
2016-03-23 16:53 ` Eric Blake
2016-03-23 21:41 ` Wei Yang
2016-03-23 21:41 ` Wei Yang
2016-03-24 1:23 ` Li, Liang Z
2016-03-24 1:23 ` Li, Liang Z
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