jira_url/secure/admin/jira/ViewMemoryInfo.jspa

The percentages for PermGen Memory Graph and Non-Heap Memory Graph (includes PermGen) are not correctly displayed on the Memory Information page. The information on the System Information page happens to be calculated correctly though.

Memory information page:

Java VM Memory Statistics
Memory Graph
22 % Free (Used: 768 MB Total: 990 MB) (Force garbage collection)

PermGen Memory Graph
64 % Free (Used: 125 MB Total: 256 MB)

Non-Heap Memory Graph (includes PermGen)
59 % Free (Used: 91 MB Total: 304 MB)

System Information page:

Java VM Memory Statistics
Total Memory 986 MB
Free Memory 153 MB
Used Memory 833 MB
Total PermGen Memory 256 MB
Free PermGen Memory 164 MB
Used PermGen Memory 125 MB
Memory Graph
16 % Free (Total: 986 MB) (Force garbage collection)

PermGen Memory Graph
64 % Free (Total: 256 MB)

Non-Heap Memory Graph (includes PermGen)
59 % Free (Total: 304 MB)