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Subject: Re: [PATCH v7 0/5] virtio-balloon: free page hint reporting support

On 04/24/2018 02:13 PM, 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.

- Test Environment
     Host: Intel(R) Xeon(R) CPU E5-2699 v4 @ 2.20GHz
     Guest: 8G RAM, 4 vCPU
     Migration setup: migrate_set_speed 100G, migrate_set_downtime 2 second

- Test Results
     - Idle Guest Live Migration Time (results are averaged over 10 runs):
         - Optimization v.s. Legacy = 271ms vs 1769ms --> ~86% reduction
     - Guest with Linux Compilation Workload (make bzImage -j4):
         - Live Migration Time (average)
           Optimization v.s. Legacy = 1265ms v.s. 2634ms --> ~51% reduction
         - Linux Compilation Time
           Optimization v.s. Legacy = 4min56s v.s. 5min3s
           --> no obvious difference

- Source Code
     - QEMU:  https://github.com/wei-w-wang/qemu-free-page-lm.git
     - Linux: https://github.com/wei-w-wang/linux-free-page-lm.git

           - add virtio_notify() at the end to notify the driver that
             the optimization is done, which indicates that the entries
             have all been put back to the vq and ready to detach them.

Hi Dave,

Thanks for reviewing this patch series. Do you have more comments on them? If no, would it be possible to get your reviewed-by? The current kernel part is done already. Hope we could finish the QEMU part soon, and have people start to use this feature. Thanks.


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