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

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Message-ID: <Z_Va-ilQPuysfdhS@bombadil.infradead.org>
Date: Tue, 8 Apr 2025 10:20:58 -0700
From: Luis Chamberlain <mcgrof@...nel.org>
To: James Bottomley <James.Bottomley@...senpartnership.com>
Cc: Christian Brauner <brauner@...nel.org>, linux-fsdevel@...r.kernel.org,
	jack@...e.cz, rafael@...nel.org, Ard Biesheuvel <ardb@...nel.org>,
	linux-efi@...r.kernel.org, linux-kernel@...r.kernel.org,
	hch@...radead.org, david@...morbit.com, djwong@...nel.org,
	pavel@...nel.org, peterz@...radead.org, mingo@...hat.com,
	will@...nel.org, boqun.feng@...il.com
Subject: Re: [PATCH 0/6] power: wire-up filesystem freeze/thaw with
 suspend/resume

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