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What are the exact conditions under which Linux changes the memory process (s) from RAM to a page file?

My server has 8Gig of RAM and 8Gigs configured for the page file. I have memory intensive applications. These applications have peak loads during which we find an increase in swap usage. About 1 GIG swap is used.

I have another server with 4Gigs RAM and 8 Gig swap and similar intensive memory applications running on it. But here the use of swap is very minor. About 100 MB.

I was wondering what the exact conditions are or the rough formula on the basis of which Linux will swap the process memory in RAM to the page file. I know that it is based on a swapiness coefficient. What else is it based on? Paging file size? Any pointers to the documentation / source code of the Linux kernel explaining this will be great.

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I saw how many people published subjective explanations of what this does. Here, I hope, a more complete answer.

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:
http://www.linuxvox.com/2009/10/what-is-the-linux-kernel-parameter-vm-swappiness/
http://www.pythian.com/news/1913/

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