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We maybe need to use "unified cgroup hierarchy" as explained at Unified and Legacy Control Group Hierarchies.

To enable this feature, add systemd.unified_cgroup_hierarchy=1 to GRUB_CMDLINE_LINUX_DEFAULT in /etc/default/grub, run update-grub, and reboot Linux.

systemd.unified_cgroup_hierarchy is explained insystemd unified cgroup hierarchy.

Then added the following lines at [Service] section of your systemd unit file, and run systemctl daemon-reload:

Delegate=memory
MemoryHigh=8G (if you choose 8 gigabytes as the limit)

Explanation of "MemoryHigh" is given at  systemd.resource-control.

We maybe need to use "unified cgroup hierarchy" as explained at Unified and Legacy Control Group Hierarchies.

To enable this feature, add systemd.unified_cgroup_hierarchy=1 to GRUB_CMDLINE_LINUX_DEFAULT in /etc/default/grub, run update-grub, and reboot Linux.

systemd.unified_cgroup_hierarchy is explained in  systemd unified cgroup hierarchy.

Then added the following lines at [Service] section of your systemd unit file, and run systemctl daemon-reload:

# if you choose 8 gigabytes as the limit
Delegate=memory
MemoryHigh=8G

Explanation of "MemoryHigh" is given at  systemd.resource-control.

We maybe need to use "unified cgroup hierarchy" as explained at Unified and Legacy Control Group Hierarchies.

To enable this feature, add systemd.unified_cgroup_hierarchy=1 to GRUB_CMDLINE_LINUX_DEFAULT in /etc/default/grub, run update-grub, and reboot Linux.

systemd.unified_cgroup_hierarchy is explained here.

Then added the following lines at [Service] section of your systemd unit file, and run systemctl daemon-reload:

Delegate=memory
MemoryHigh=8G (if you choose 8 gigabytes as the limit)

Explanation of "MemoryHigh" is given at here.

We maybe need to use "unified cgroup hierarchy" as explained at Unified and Legacy Control Group Hierarchies.

To enable this feature, add systemd.unified_cgroup_hierarchy=1 to GRUB_CMDLINE_LINUX_DEFAULT in /etc/default/grub, run update-grub, and reboot Linux.

systemd.unified_cgroup_hierarchy is explained insystemd unified cgroup hierarchy.

Then added the following lines at [Service] section of your systemd unit file, and run systemctl daemon-reload:

Delegate=memory
MemoryHigh=8G (if you choose 8 gigabytes as the limit)

Explanation of "MemoryHigh" is given at systemd.resource-control.

We maybe need to use "unified cgroup hierarchy" as explained at https://www.freedesktop.org/software/systemd/man/systemd.resource-control.html#Unified%20and%20Legacy%20Control%20Group%20Hierarchies

To enable this feature, add "systemd.unified_cgroup_hierarchy=1" to GRUB_CMDLINE_LINUX_DEFAULT in /etc/default/grub, run "update-grub", and reboot Linux. "systemd.unified_cgroup_hierarchy" is explained at https://www.freedesktop.org/software/systemd/man/systemd.html#systemd.unified_cgroup_hierarchy

Then added the following lines at "[Service]" section of your systemd unit file, and run "systemctl daemon-reload":

Delegate=memory
MemoryHigh=8G (if you choose 8 gigabytes as the limit)

Explanation of "MemoryHigh" is given at https://www.freedesktop.org/software/systemd/man/systemd.resource-control.html#MemoryHigh=bytes

We maybe need to use "unified cgroup hierarchy" as explained at Unified and Legacy Control Group Hierarchies.

To enable this feature, add systemd.unified_cgroup_hierarchy=1 to GRUB_CMDLINE_LINUX_DEFAULT in /etc/default/grub, run update-grub, and reboot Linux.

systemd.unified_cgroup_hierarchy is explained here.

Then added the following lines at [Service] section of your systemd unit file, and run systemctl daemon-reload:

Delegate=memory
MemoryHigh=8G (if you choose 8 gigabytes as the limit)

Explanation of "MemoryHigh" is given at here.