Reporting Swap Space Usage

Question

I own a piece of software that reports three Solaris swap space statistics:
Available
Used
Total
It uses the swapctl API to gather the data. One user reports that this is insufficient because Solaris uses a combination of disk space (reported by swapctl) and RAM. I've spent some time researching this and think I've found that the RAM swap space statistics are available in the kstat vminfo block. Questions:
1. Is there a Solaris API that will give me total swap space statistics (disk + RAM)?
2. If not, am I correct that the kstat vminfo fields report just the RAM swap space statistics and that I just therefore be able to add the values from swapctl and kstat to get the total statistics I require?
3. The vminfo block has the following swap-related properties:
     swap_resv;     /* reserved swap in pages     */
     swap_alloc; /* allocated swap in pages     */
     swap_avail; /* unreserved swap in pages */
     swap_free;     /* unallocated swap in pages */
From what I read, I think that "reserved" + "allocated" would map to what we call "used." What is the distinction between "unreserved" and "unallocated"? If I add all four of these values together, do I get the total amount of swap space allocated in RAM?
4. I see that these vminfo values are raw counts and that to determine the real number, you have to sample the data over an interval, subtract the values and divide by the interval to get an average. Is there any other API that gives you the values at that point in time?

Answer 1

For your questioin # 1, try using the `top` command. You can cownload this
package from www.sunfreeware.com. It has bot the Binary file and source file.