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From: "Michael S. Tsirkin" <mst@redhat.com>
To: Wei Wang <wei.w.wang@intel.com>
Cc: virtio-dev@lists.oasis-open.org, linux-kernel@vger.kernel.org,
	virtualization@lists.linux-foundation.org, kvm@vger.kernel.org,
	linux-mm@kvack.org, mhocko@kernel.org, akpm@linux-foundation.org,
	dgilbert@redhat.com, torvalds@linux-foundation.org,
	pbonzini@redhat.com, liliang.opensource@gmail.com,
	yang.zhang.wz@gmail.com, quan.xu0@gmail.com, nilal@redhat.com,
	riel@redhat.com, peterx@redhat.com, quintela@redhat.com
Subject: Re: [PATCH v37 0/3] Virtio-balloon: support free page reporting
Date: Wed, 24 Oct 2018 20:58:52 -0400	[thread overview]
Message-ID: <20181024205759-mutt-send-email-mst@kernel.org> (raw)
In-Reply-To: <1535333539-32420-1-git-send-email-wei.w.wang@intel.com>

On Mon, Aug 27, 2018 at 09:32:16AM +0800, Wei Wang wrote:
> The new feature, VIRTIO_BALLOON_F_FREE_PAGE_HINT, implemented by this
> series enables the virtio-balloon driver to report hints of guest free
> pages to host. It can be used to accelerate virtual machine (VM) live
> migration. Here is an introduction of this usage:
> 
> Live migration needs to transfer the VM's memory from the source machine
> to the destination round by round. For the 1st round, all the VM's memory
> is transferred. From the 2nd round, only the pieces of memory that were
> written by the guest (after the 1st round) are transferred. One method
> that is popularly used by the hypervisor to track which part of memory is
> written is to have the hypervisor write-protect all the guest memory.
> 
> This feature enables the optimization by skipping the transfer of guest
> free pages during VM live migration. It is not concerned that the memory
> pages are used after they are given to the hypervisor as a hint of the
> free pages, because they will be tracked by the hypervisor and transferred
> in the subsequent round if they are used and written.

OK so it will be in linux-next.  Now can I trouble you for a virtio spec
patch with the description please?


> * Tests
> 1 Test Environment
>     Host: Intel(R) Xeon(R) CPU E5-2699 v4 @ 2.20GHz
>     Migration setup: migrate_set_speed 100G, migrate_set_downtime 400ms
> 
> 2 Test Results (results are averaged over several repeated runs)
>     2.1 Guest setup: 8G RAM, 4 vCPU
>         2.1.1 Idle guest live migration time
>             Optimization v.s. Legacy = 620ms vs 2970ms
>             --> ~79% reduction
>         2.1.2 Guest live migration with Linux compilation workload
>           (i.e. make bzImage -j4) running
>           1) Live Migration Time:
>              Optimization v.s. Legacy = 2273ms v.s. 4502ms
>              --> ~50% reduction
>           2) Linux Compilation Time:
>              Optimization v.s. Legacy = 8min42s v.s. 8min43s
>              --> no obvious difference
> 
>     2.2 Guest setup: 128G RAM, 4 vCPU
>         2.2.1 Idle guest live migration time
>             Optimization v.s. Legacy = 5294ms vs 41651ms
>             --> ~87% reduction
>         2.2.2 Guest live migration with Linux compilation workload
>           1) Live Migration Time:
>             Optimization v.s. Legacy = 8816ms v.s. 54201ms
>             --> 84% reduction
>           2) Linux Compilation Time:
>              Optimization v.s. Legacy = 8min30s v.s. 8min36s
>              --> no obvious difference
> 
> ChangeLog:
> v36->v37:
>     - free the reported pages to mm when receives a DONE cmd from host.
>       Please see patch 1's commit log for reasons. Please see patch 1's
>       commit for detailed explanations.
> 
> For ChangeLogs from v22 to v36, please reference
> https://lkml.org/lkml/2018/7/20/199
> 
> For ChangeLogs before v21, please reference
> https://lwn.net/Articles/743660/
> 
> Wei Wang (3):
>   virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE_HINT
>   mm/page_poison: expose page_poisoning_enabled to kernel modules
>   virtio-balloon: VIRTIO_BALLOON_F_PAGE_POISON
> 
>  drivers/virtio/virtio_balloon.c     | 374 ++++++++++++++++++++++++++++++++----
>  include/uapi/linux/virtio_balloon.h |   8 +
>  mm/page_poison.c                    |   6 +
>  3 files changed, 355 insertions(+), 33 deletions(-)
> 
> -- 
> 2.7.4

  parent reply	other threads:[~2018-10-25  0:59 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-08-27  1:32 Wei Wang
2018-08-27  1:32 ` [PATCH v37 1/3] virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE_HINT Wei Wang
2018-12-27 12:03   ` Christian Borntraeger
2018-12-28  3:12     ` Wei Wang
2018-12-28  8:03       ` Christian Borntraeger
2018-08-27  1:32 ` [PATCH v37 2/3] mm/page_poison: expose page_poisoning_enabled to kernel modules Wei Wang
2018-08-27  1:32 ` [PATCH v37 3/3] virtio-balloon: VIRTIO_BALLOON_F_PAGE_POISON Wei Wang
2018-10-25  0:58 ` Michael S. Tsirkin [this message]
2018-10-25 10:18   ` [PATCH v37 0/3] Virtio-balloon: support free page reporting Wei Wang
2018-12-27 11:31 ` Christian Borntraeger
2018-12-27 11:59   ` Christian Borntraeger
2018-12-27 12:17     ` Christian Borntraeger
2018-12-28  6:41       ` Wei Wang

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