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VM_PAGE_AFLAG(9) BSD Kernel Developer's Manual VM_PAGE_AFLAG(9) NAME vm_page_aflag_clear, vm_page_aflag_set, vm_page_reference -- change page atomic flags SYNOPSIS #include <sys/param.h> #include <vm/vm.h> #include <vm/vm_page.h> void vm_page_aflag_clear(vm_page_t m, uint8_t bits); void vm_page_aflag_set(vm_page_t m, uint8_t bits); void vm_page_reference(vm_page_t m); DESCRIPTION The vm_page_aflag_clear() atomically clears the specified bits on the page's aflags. The vm_page_aflag_set() atomically sets the specified bits on the page's aflags. The vm_page_reference(m) call is the same as vm_page_aflag_set(m, PGA_REFERENCED); and is the recommended way to mark the page as referenced from third- party kernel modules. These functions neither block nor require any locks to be held around the calls for correctness. The functions arguments are: m The page whose aflags are updated. bits The bits that are set or cleared on the page's flags. The following aflags can be set or cleared: PGA_REFERENCED The bit may be set to indicate that the page has been re- cently accessed. For instance, pmap(9) sets this bit to reflect the accessed attribute of the page mapping typi- cally updated by processor's memory management unit on the page access. PGA_WRITEABLE A writeable mapping for the page may exist. Both PGA_REFERENCED and PGA_WRITEABLE bits are only valid for the managed pages. AUTHORS This manual page was written by Chad David <davidc@acns.ab.ca>. BSD August 31, 2011 BSD
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