| vm_page_dontneed.9 (87182) | vm_page_dontneed.9 (87857) |
|---|---|
| 1.\" 2.\" Copyright (C) 2001 Chad David <davidc@acns.ab.ca>. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice(s), this list of conditions and the following disclaimer as --- 10 unchanged lines hidden (view full) --- 19.\" DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 20.\" (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 21.\" SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 22.\" CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH 25.\" DAMAGE. 26.\" | 1.\" 2.\" Copyright (C) 2001 Chad David <davidc@acns.ab.ca>. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice(s), this list of conditions and the following disclaimer as --- 10 unchanged lines hidden (view full) --- 19.\" DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 20.\" (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 21.\" SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 22.\" CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH 25.\" DAMAGE. 26.\" |
| 27.\" $FreeBSD: head/share/man/man9/vm_page_dontneed.9 87182 2001-12-02 02:13:35Z alfred $ | 27.\" $FreeBSD: head/share/man/man9/vm_page_dontneed.9 87857 2001-12-14 09:11:13Z ru $ |
| 28.\" 29.Dd July 30, 2001 30.Dt VM_PAGE_DONTNEED 9 31.Os 32.Sh NAME 33.Nm vm_page_dontneed 34.Nd "indicate that a page is not needed anymore" 35.Sh SYNOPSIS 36.In sys/param.h 37.In vm/vm.h 38.In vm/vm_page.h 39.Ft void 40.Fn vm_page_dontneed "vm_page_t m" 41.Sh DESCRIPTION 42The 43.Fn vm_page_dontneed 44function advises the VM system that the given page is no longer 45required. | 28.\" 29.Dd July 30, 2001 30.Dt VM_PAGE_DONTNEED 9 31.Os 32.Sh NAME 33.Nm vm_page_dontneed 34.Nd "indicate that a page is not needed anymore" 35.Sh SYNOPSIS 36.In sys/param.h 37.In vm/vm.h 38.In vm/vm_page.h 39.Ft void 40.Fn vm_page_dontneed "vm_page_t m" 41.Sh DESCRIPTION 42The 43.Fn vm_page_dontneed 44function advises the VM system that the given page is no longer 45required. |
| 46If the page is already in the inactive queue or the cache queue this | 46If the page is already in the inactive queue or in the cache queue, this |
| 47function does nothing; otherwise the page is deactivated. 48.Pp 49Note that 50.Fn vm_page_dontneed 51does not necessarily deactivate a page, but instead implements an 52algorithm that attempts to prevent small objects from having their 53pages reused too quickly, and large objects from flushing smaller 54ones from the queues as their pages are released. 55.Sh SEE ALSO 56.Xr vm_page_deactivate 9 57.Sh AUTHORS 58This manual page was written by 59.An Chad David Aq davidc@acns.ab.ca . | 47function does nothing; otherwise the page is deactivated. 48.Pp 49Note that 50.Fn vm_page_dontneed 51does not necessarily deactivate a page, but instead implements an 52algorithm that attempts to prevent small objects from having their 53pages reused too quickly, and large objects from flushing smaller 54ones from the queues as their pages are released. 55.Sh SEE ALSO 56.Xr vm_page_deactivate 9 57.Sh AUTHORS 58This manual page was written by 59.An Chad David Aq davidc@acns.ab.ca . |