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?
- -chris zubrzycki
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