lkml.org 
[lkml]   [2019]   [Dec]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: vfio_pin_map_dma cause synchronize_sched wait too long
From
Date
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

\
 
 \ /
  Last update: 2019-12-02 10:32    [W:0.049 / U:8.072 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site