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the Virtual Memory

Hi,

a while ago I wrote a tool similar to Linux's free for Darwin (basically at the time because I needed a quick way to log the RAM consumption of a WebObjects server), but left out reporting on swap because I didn't know how. Now I'm coming back to fill in reporting on swap, and still don't know how :-)

Does the value vm_statistics_t->pageouts report the number of pageouts since boot, or the number of pages which are currently paged out? If the latter, then I suppose the 'used swap space' is simply that quantity times the page size. What is the 'total swap space', if such a question makes sense with this VMM? Is it just the size of all of the in-use swapfiles? Is there yet any way to determine the files currently being used for swap? Oh, and is there a modern equivalent for mach_swapon and /etc/swaptab?

Maybe a better question would be: where is there a general reference to the VMM used in Darwin, beyond the source code (xnu/osfmk/vm/)? I've just found the Rashid/Tevanien/et al paper on the mach VMM, which I "look forward" to ploughing through along with the appropriate chapter in the OSF documentation. Is there anything Darwin-specific?

Cheers,

Graham.
--
Graham Lee
UNIX Systems Manager,
Oxford Physics Practical Course
http://iamleeg.blogspot.com/
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