svmon
The svmon command captures a snapshot of virtual memory. The displayed information does not constitute a true snapshot of memory, because the svmon command runs at the user level with interrupts enabled. The segment is a set of pages and is the basic object used to report the memory consumption, so the statistics reported by svmon are expressed in terms of pages. A page is a block of virtual memory, while a frame is a block of real memory. Frames always have a size of 4 KB, whereas pages may have different sizes. The base page size is 4 KB. All pages inside a segment have the same size.
The memory consumption is reported using the inuse, free, pin, virtual, and paging space counters:
| inuse counter | Used frames. |
| free counter | Free frames from all memory pools. |
| pin counter | Pinned frames (that is, frames that cannot be swapped). |
| virtual counter | Pages allocated in the system virtual space. |
| paging space counter | Pages reserved or used on paging spaces. |
