Re: [PATCH 0/6] power: wire-up filesystem freeze/thaw with suspend/resume

[Luis Chamberlain <mcgrof@kernel.org>]

And in case its useful, to test this on a VM you'll need on libvirt:

</os>                                                                                                                                                                                                                                      
<pm>                                                                                                                                                                                                                                     
<suspend-to-mem enabled='yes'/>                                                                                                                                                                                                          
<suspend-to-disk enabled='yes'/>                                                                                                                                                                                                         
</pm>   

The litmus test which used to stall without ever returning was:

while true; do                                                                                                                                                                                                                               
dd if=/dev/zero of=/path/to/xfs/foo bs=1M count=1024 &> /dev/null
done 

To suspend you can use one of these two:

echo mem > /sys/power/state
systemctl suspend

Verify you can resume from suspend:
virsh qemu-monitor-command guest_foo 'query-current-machine'
{"return":{"wakeup-suspend-support":true},"id":"libvirt-415"}

To resume the guest:

virsh dompmwakeup guest_foo

  Luis