:The code works fine in all of my tests, except that calling :swapoff() when the system is under heavy paging load and has :multiple swap devices sometimes leads to a few pages being missed :by the scan. I think the problem is that some process allocates :some swap and starts paging out just before the device is marked :as off-limits. Am I missing a simple solution to this problem? :(For now, I kludge around the issue by rescanning if there are :still blocks remaining.)

Hmm. Yes, I think the issue here is that you may be missing pages in objects which are undergoing I/O. You may need to wait for other paging on the object (the pip count) to go to zero. I will review that code more carefully in a little bit and give you a definitive answer.

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