On Mon, 2024-12-09 at 05:07 -0600, Ranjan Maitra via users wrote:
> Thank you!
>
> So, in the past, for an ext4 system, which is what I have, I used to do the following:
>
>
> sudo vi /etc/default/grub
>
> add --> resume=UUID="****" <-- to the line GRUB_CMDLINE_LINUX= (anywhere, i do it before the rhgb)
>
> where the uuid is obtained using blkid.
>
> then
>
> sudo bash -x grub2-mkconfig
>
> # # for efi-based systems: #
>
> sudo bash -x grub2-mkconfig -o /boot/efi/EFI/fedora/grub.cfg
>
> and then reboot.
>
> So, we basically ignore the zram0?
Keep the zram. It makes a real difference to performance. However you
can add some systemd units to disable it when hibernating, e.g.:
$ cat /etc/systemd/system/hibernate-preparation.service
[Unit]
Description=Enable swap file and disable zram before hibernate
Before=systemd-hibernate.service
[Service]
SyslogIdentifier=%N
User=root
Type=oneshot
ExecStartPre=/bin/bash -c ' \
swapon -a; \
swapoff /dev/zram0; \
exit 0; \
'
ExecStart=/bin/true
The 'swapon -a' line is because I would normally only have zram
enabled, but you can remove this if you're going to keep the swap
partition (or file) active all the time.
$ cat /etc/systemd/system/hibernate-resume.service
[Unit]
Description=Enable zram swap after resuming from hibernation
After=hibernate.target
[Service]
SyslogIdentifier=%N
User=root
Type=oneshot
ExecStart=/bin/bash -c ' \
if ! swapon --show=NAME --noheadings | grep -q /dev/zram0; then \
swapon /dev/zram0; \
fi; \
exit 0; \
'
[Install]
WantedBy=hibernate.target
You put those in the appropriate places and call 'systemctl enable ...'
for each of them, then reboot.
Disclaimer: I set this up in F40 and used it for a while but had some
issues with getting it to work reliably with BTRFS so now I'm just
doing suspend rather than hibernate (I have a desktop). However it
should be OK with ext4.
poc
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