Re: [Qemu-devel] [PATCH v2 kernel 0/7] Extend virtio-balloon for fast (de)inflating & fast live migration

[Li, Liang Z]

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Liang

> -----Original Message-----
> From: Li, Liang Z
> Sent: Wednesday, June 29, 2016 6:32 PM
> To: address@hidden
> Cc: address@hidden; address@hidden;
> address@hidden; address@hidden; address@hidden
> open.org; address@hidden; address@hidden; Li, Liang Z
> Subject: [PATCH v2 kernel 0/7] Extend virtio-balloon for fast (de)inflating &
> fast live migration
> 
> This patch set contains two parts of changes to the virtio-balloon.
> 
> One is the change for speeding up the inflating & deflating process, the main
> idea of this optimization is to use bitmap to send the page information to
> host instead of the PFNs, to reduce the overhead of virtio data transmission,
> address translation and madvise(). This can help to improve the performance
> by about 85%.
> 
> Another change is for speeding up live migration. By skipping process guest's
> free pages in the first round of data copy, to reduce needless data 
> processing,
> this can help to save quite a lot of CPU cycles and network bandwidth. We
> put guest's free page information in bitmap and send it to host with the virt
> queue of virtio-balloon. For an idle 8GB guest, this can help to shorten the
> total live migration time from 2Sec to about 500ms in the 10Gbps network
> environment.
> 
> 
> Changes from v1 to v2:
>     * Abandon the patch for dropping page cache.
>     * Put some structures to uapi head file.
>     * Use a new way to determine the page bitmap size.
>     * Use a unified way to send the free page information with the bitmap
>     * Address the issues referred in MST's comments
> 
> Liang Li (7):
>   virtio-balloon: rework deflate to add page to a list
>   virtio-balloon: define new feature bit and page bitmap head
>   mm: add a function to get the max pfn
>   virtio-balloon: speed up inflate/deflate process
>   virtio-balloon: define feature bit and head for misc virt queue
>   mm: add the related functions to get free page info
>   virtio-balloon: tell host vm's free page info
> 
>  drivers/virtio/virtio_balloon.c     | 306
> +++++++++++++++++++++++++++++++-----
>  include/uapi/linux/virtio_balloon.h |  41 +++++
>  mm/page_alloc.c                     |  52 ++++++
>  3 files changed, 359 insertions(+), 40 deletions(-)
> 
> --
> 1.8.3.1