Unit Instance

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        "Under Linux there is no such linked list.  To remove all the hardware page table mappings for a `vm_page` linux must index into every VM object that _might_ have mapped the page.  For example, if you have 50 processes all mapping the same shared library and want to get rid of page X in that library, you need to index into the page table for each of those 50 processes even if only 10 of them have actually mapped the page.  So Linux is trading off the simplicity of its design against performance.  Many VM algorithms which are O(1) or (small N) under FreeBSD wind up being O(N), O(N^2), or worse under Linux.  Since the pte's representing a particular page in an object tend to be at the same offset in all the page tables they are mapped in, reducing the number of accesses into the page tables at the same pte offset will often avoid blowing away the L1 cache line for that offset, which can lead to better performance."
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    "timestamp": "2023-05-21T18:04:59.266306Z"
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