6. Replacement Scope

This can be categorized as global or local. A local replacement policy chooses only among the resident pages of the process that generates the page fault in selecting a page to replace. A global replacemt policy considers all unlocked pages in main memory for replacement regardless of the process owning a particular page.
    A fixed resident set impl9ies local replacement policy to hold the size of a resident set fixed. A page that is removed form main memory must be replaced by another page form the same process. A variable allocation policy can clearly employ global replacement policy wherin replacement of a page from one process in main memory with that of another causes allocation of one process to grow by a page and that of the other to shrink by a page.

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