[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Qemu-devel] [PATCH v2 0/3] virtio-balloon: free page hint reporting

From: Wei Wang
Subject: Re: [Qemu-devel] [PATCH v2 0/3] virtio-balloon: free page hint reporting support
Date: Thu, 08 Feb 2018 13:38:27 +0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0

On 02/07/2018 08:02 AM, Michael S. Tsirkin wrote:
On Tue, Feb 06, 2018 at 07:08:16PM +0800, Wei Wang wrote:
This is the deivce part implementation to add a new feature,
VIRTIO_BALLOON_F_FREE_PAGE_HINT to the virtio-balloon device. The device
receives the guest free page hints from the driver and clears the
corresponding bits in the dirty bitmap, so that those free pages are
not transferred by the migration thread to the destination.

Please see the driver patch link for test results:

     1) virtio-balloon
         - use subsections to save free_page_report_cmd_id;
         - poll the free page vq after sending a cmd id to the driver;
         - change the free page vq size to VIRTQUEUE_MAX_SIZE;
         - virtio_balloon_poll_free_page_hints: handle the corner case
           that the free page block reported from the driver may cross
           the RAMBlock boundary.
     2) migration/ram.c
         - use balloon_free_page_poll to start the optimization

Wei Wang (3):
   migration: use the free page reporting feature from balloon
   virtio-balloon: add a timer to limit the free page report waiting time
This feature needs in-tree documentation about possible ways to use it,
tradeoffs involved etc.

OK. I plan to add the documentation in later versions after we mostly finalize the QEMU part design.


reply via email to

[Prev in Thread] Current Thread [Next in Thread]