freebsd man page for vm_page_dontneed

VM_PAGE_DONTNEED(9)					   BSD Kernel Developer's Manual				       VM_PAGE_DONTNEED(9)

NAME
     vm_page_dontneed -- indicate that a page is not needed anymore

SYNOPSIS
     #include <sys/param.h>
     #include <vm/vm.h>
     #include <vm/vm_page.h>

     void
     vm_page_dontneed(vm_page_t m);

DESCRIPTION
     The vm_page_dontneed() function advises the VM system that the given page is no longer required.  If the page is already in the inactive
     queue or in the cache queue, this function does nothing; otherwise the page is deactivated.

     Note that vm_page_dontneed() does not necessarily deactivate a page, but instead implements an algorithm that attempts to prevent small
     objects from having their pages reused too quickly, and large objects from flushing smaller ones from the queues as their pages are released.

SEE ALSO
     vm_page_deactivate(9)

AUTHORS
     This manual page was written by Chad David <davidc@acns.ab.ca>.

BSD
								   July 30, 2001							       BSD