Containers specific case: if total memory taken from cgroups is lower
than system memory taken from psutil, calculate memory usage based on
information from cgroups. The formula idea is taken from
https://github.com/moby/moby/issues/40727#issuecomment-604155288Closes#1780
Tests performed:
- In a non-container environment, filled the memory 90%
```
stress-ng --vm-bytes $(awk '/MemAvailable/{printf "%d\n", $2 * 0.9;}' \
< /proc/meminfo)k --vm-keep -m 1
```
and ensured that correct notification is shown.
- In a container, if no memory limitations are set, notifications are
based on host memory usage
- In a container, if memory limits are set
```
systemctl set-property systemd-nspawn@fbx-testing.service MemoryMax=200M
```
ensured that the notification is shown and is calculated based on
cgroups.
Signed-off-by: Veiko Aasa <veiko17@disroot.org>
[sunil: Fix i18n for notification message]
[sunil: Drop unnecessary type conversion]
Signed-off-by: Sunil Mohan Adapa <sunil@medhas.org>
Reviewed-by: Sunil Mohan Adapa <sunil@medhas.org>
d93f2f634d