tracing a page's whereabouts.

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Hello:

I'm trying to trace a page's behavior, from the first
fresh read to any possible re-reads from swap area.

I found page identity a problem. <pid, virtual add>
may not identify a page due to sharing. And I find
<inode, offset> would always become <swapper_inode,
entry> during swapping.

Are there any place to find the correspondance of
these two different identities of a page.
Or is there a identification of a page from the frist
read untill the last free?

thanks.

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