-Display, in the lower window, swap space in use on each swap
-device configured. Two sets of bar graphs are shown. The
-upper graph displays swap space allocated to pure text segments
-(code), the lower graph displays space allocated to stack and
-data segments. Allocated space is sorted by its size into buckets
-of size dmmin, dmmin*2, dmmin*4, up to dmmax (to reflect allocation
-policies imposed by the system). The disk segment size, in sectors,
-is displayed along the left hand side of the text,
-and data and stack graphs.
-Space allocated to the user structure and page
-tables is not currently accounted for.
+Show information about swap space usage on all the
+swap areas compiled into the kernel.
+The first column is the device name of the partition.
+The next column is the total space available in the partition.
+The
+.Ar Used
+column indicates the total blocks used so far;
+the graph shows the percentage of space in use on each partition.
+If there are more than one swap partition in use,
+a total line is also shown.
+Areas known to the kernel, but not in use are shown as not available.