When Are Free Pages Zeroed?

[Patrick Simmons]

I'm looking into the Linux memory management subsystem and need to know 
when freed pages are zeroed.  Specifically, are they zeroed just before 
they are reallocated, immediately after they are freed, or sometime 
in-between?  Also, what files/functions would I need to modify to change 
this behavior?

Thanks for any help and kindest regards,
--Patrick

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