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Re: vfio_pin_map_dma cause synchronize_sched wait too long
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From: |
Paolo Bonzini |
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Subject: |
Re: vfio_pin_map_dma cause synchronize_sched wait too long |
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Date: |
Mon, 2 Dec 2019 10:31:11 +0100 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.1.1 |
On 02/12/19 10:10, Longpeng (Mike) wrote:
>
> Suppose there're two VMs: VM1 is bind to node-0 and calling
> vfio_pin_map_dma(),
> VM2 is a migrate incoming VM which bind to node-1. We found the vm_start( QEMU
> function) of VM2 will take too long occasionally, the reason is as follow.
Which part of vfio_pin_map_dma is running? There is already a
cond_resched in vfio_iommu_map. Perhaps you could add one to
vfio_pin_pages_remote and/or use vfio_pgsize_bitmap to cap the number of
pages that it returns.
Paolo