bradh352 commented on PR #11932:
URL: https://github.com/apache/cloudstack/pull/11932#issuecomment-3607149640
Well, honestly the first test was enough to convince me it is working well:
Fresh VM (wihtin VM):
```
root@test1:~# free
total used free shared buff/cache
available
Mem: 16369284 617328 15567232 11004 474740
15751956
Swap: 0 0 0
```
In Hypervisor:
```
root@node1:~# ps -o pid,rss,vsz,command -p 1417359
PID RSS VSZ COMMAND
1417359 1408680 19634724 /usr/bin/qemu-system-x86_64 -name
guest=i-2-304-VM,...
```
In VM, allocate a tmpfs mount and a large file:
```
root@test1:~# mount -t tmpfs tmpfs /mnt
root@test1:~# dd if=/dev/zero of=/mnt/bigfile bs=1M count=10000
dd: error writing '/mnt/bigfile': No space left on device
7993+0 records in
7992+0 records out
8381071360 bytes (8.4 GB, 7.8 GiB) copied, 3.95783 s, 2.1 GB/s
root@test1:~# free
total used free shared buff/cache
available
Mem: 16369284 8805920 7369168 8195644 8678156
7563364
Swap: 0 0 0
```
In Hypervisor:
```
root@node1:~# ps -o pid,rss,vsz,command -p 1417359
PID RSS VSZ COMMAND
1417359 9782676 19615192 /usr/bin/qemu-system-x86_64 -name
guest=i-2-304-VM,...
```
Cleanup:
```
root@test1:~# rm -f /mnt/bigfile && umount /mnt
root@test1:~# free
total used free shared buff/cache
available
Mem: 16369284 599236 15467600 11004 594464
15770048
Swap: 0 0 0
```
In Hypervisor:
```
root@node1:~# ps -o pid,rss,vsz,command -p 1417359
PID RSS VSZ COMMAND
1417359 1523988 19610052 /usr/bin/qemu-system-x86_64 -name
guest=i-2-304-VM,...
```
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