Many more words on volatile ranges
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The volatile ranges feature provides applications that cache large amounts of data that they can (relatively easily) re-create—for example, browsers caching web content—with a mechanism to assist the kernel in making decisions about which pages can be discarded from memory when the system is under memory pressure. An application that wants to assist the kernel in this way does so by informing the kernel that a range of pages in its address space can be discarded at any time, if the kernel needs to reclaim memory.
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