The Pankian Metaphor 3094

page-in,

But that's all you're going to swap out. I'm not aware of one, but there might have been one circumstance when all of memory had to be swapped out. JMF and TW used this to do the system sleep function.

I think you're confusing VM addressing size with physical memory size. You don't have to have a swap space the size of VM addressing, just the physical.

I don't understand why. All you can do is confuse yourself if you may have two copies of the same page on disk. Jeez...that would open up a whole Pandora's box of bugs, race conditions, and a CATCH-22 or two.

Well, you don't throw the in core copy away just in case it's never overwritten. But that is an exception to the rule, and usually are very rare exception to the rule. If you had to swap out the contents of the memory, it meant that you needed the space for another job.

But this has to be a rare IF. Very rare. The only reason one would call the swapper is to free up memory for a current need.

People don't swap for the hell of it, unless they're testing the code.

BAH