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Many operating systems allow user programs to specify the protection level (inaccessible, read-only, read-write) of pages in their virtual memory address space, and to handle any protection violations that may occur. Such page-protection techniques have been exploited by several user-level algorithms for applications including generational garbage collection and persistent stores. Unfortunately, modern hardware has made efficient handling of page protection faults more difficult. Moreover,doi:10.1145/168619.168628 dblp:conf/sosp/HoskingM93 fatcat:mvsxcrierjcxrc2cswvxfbu4p4