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Man Pages
VM_PAGE_AFLAG(9) FreeBSD Kernel Developer's Manual VM_PAGE_AFLAG(9)

vm_page_aflag_clear, vm_page_aflag_set, vm_page_reference
change page atomic flags

#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);

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 recently accessed. For instance, pmap(9) sets this bit to reflect the accessed attribute of the page mapping typically 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.

This manual page was written by Chad David <davidc@acns.ab.ca>.
August 31, 2011 FreeBSD 12.0-RELEASE

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