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Levin had a chapter in his book Mac OS X and iOS internals: To the Apple's Core. related to The Default Freezer which can be used in Virtual Memory Management. It is stated that it is implemented in osfmk/vm/default_freezer.c

At the time of writing this was still incomplete. Does anyone know if this is implemented in newer versions of iOS? I did not find a lot of documentation for this.

blaffie
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It is, in iOS 8, in conjunction with memorystatus/jetsam. It'll be covered in more detail in the 2nd Edition of his book, too.

Technologeeks
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