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[linuxjm/jm.git] / manual / LDP_man-pages / release / man2 / swapon.2

.\" Hey Emacs! This file is -*- nroff -*- source.
.\"
.\" Copyright (c) 1992 Drew Eckhardt (drew@cs.colorado.edu), March 28, 1992
.\"
.\" Permission is granted to make and distribute verbatim copies of this
.\" manual provided the copyright notice and this permission notice are
.\" preserved on all copies.
.\"
.\" Permission is granted to copy and distribute modified versions of this
.\" manual under the conditions for verbatim copying, provided that the
.\" entire resulting derived work is distributed under the terms of a
.\" permission notice identical to this one.
.\"
.\" Since the Linux kernel and libraries are constantly changing, this
.\" manual page may be incorrect or out-of-date.  The author(s) assume no
.\" responsibility for errors or omissions, or for damages resulting from
.\" the use of the information contained herein.  The author(s) may not
.\" have taken the same level of care in the production of this manual,
.\" which is licensed free of charge, as they might when working
.\" professionally.
.\"
.\" Formatted or processed versions of this manual, if unaccompanied by
.\" the source, must acknowledge the copyright and authors of this work.
.\"
.\" Modified by Michael Haardt <michael@moria.de>
.\" Modified 1993-07-24 by Rik Faith <faith@cs.unc.edu>
.\" Modified 1995-07-22 by Michael Chastain <mec@duracef.shout.net>
.\" Modified 1995-07-23 by aeb
.\" Modified 1996-10-22 by Eric S. Raymond <esr@thyrsus.com>
.\" Modified 1998-09-08 by aeb
.\" Modified 2004-06-17 by Michael Kerrisk <mtk.manpages@gmail.com>
.\" Modified 2004-10-10 by aeb
.\" 2004-12-14 mtk, Anand Kumria: added new errors
.\" 2007-06-22 Ivana Varekova <varekova@redhat.com>, mtk
.\"     Update text describing limit on number of swap files.
.\"
.\" Japanese Version Copyright (c) 1997 HANATAKA Shinya
.\"         all rights reserved.
.\" Translated Mon Mar  3 23:54:56 JST 1997
.\"         by HANATAKA Shinya <hanataka@abyss.rim.or.jp>
.\" Modified Tue Dec  1 00:08:07 JST 1998
.\"         by HANATAKA Shinya <hanataka@abyss.rim.or.jp>
.\" Updated & Modified Fri Feb 11 07:40:12 JST 2005
.\"         by Yuichi SATO <ysato444@yahoo.co.jp>
.\" Updated 2007-09-04, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>, LDP v2.64
.\"
.\"WORD:        swap                    ¥¹¥ï¥Ã¥×
.\"WORD:        block device            ¥Ö¥í¥Ã¥¯¡¦¥Ç¥Ð¥¤¥¹
.\"WORD:        super-user              ¥¹¡¼¥Ñ¡¼¡¦¥æ¡¼¥¶¡¼
.\"WORD:        round robin             ¥é¥¦¥ó¥É¡¦¥í¥Ó¥ó
.\"WORD:        partition               ¥Ñ¡¼¥Æ¥£¥·¥ç¥ó
.\"WORD:        page                    ¥Ú¡¼¥¸
.\"WORD:        kernel                  ¥«¡¼¥Í¥ë
.\"
.TH SWAPON 2 2007-06-22 "Linux" "Linux Programmer's Manual"
.SH ̾Á°
swapon, swapoff \- ¥Õ¥¡¥¤¥ë/¥Ç¥Ð¥¤¥¹¤Ø¤Î¥¹¥ï¥Ã¥×¤ò³«»Ï/Ää»ß¤¹¤ë
.SH ½ñ¼°
.B #include <unistd.h>
.br
.B #include <asm/page.h>     /* PAGE_SIZE ¤ò¸«¤Ä¤±¤ë¤¿¤á */
.br
.B #include <sys/swap.h>
.sp
.BI "int swapon(const char *" path ", int " swapflags );
.br
.BI "int swapoff(const char *" path );
.SH ÀâÌÀ
.BR swapon ()
¤Ï
.I path
¤Ç»ØÄꤵ¤ì¤¿¥Õ¥¡¥¤¥ë¤ä¥Ö¥í¥Ã¥¯¡¦¥Ç¥Ð¥¤¥¹¤Ë¥¹¥ï¥Ã¥×Îΰè¤òÀßÄꤹ¤ë¡£
.BR swapoff ()
¤Ï
.I path
¤Ç»ØÄꤵ¤ì¤¿¥Õ¥¡¥¤¥ë¤ä¥Ö¥í¥Ã¥¯¡¦¥Ç¥Ð¥¤¥¹¤Ø¤Î¥¹¥ï¥Ã¥×¤òÄä»ß¤¹¤ë¡£
.PP
.BR swapon ()
¤Ï
.I swapflags
°ú¤­¿ô¤ò¼è¤ë¡£
.I swapflags
¤Ë
.B SWAP_FLAG_PREFER
¥Ó¥Ã¥È¤¬ÀßÄꤵ¤ì¤¿¾ì¹ç¤Ï¡¢¿·¤·¤¤¥¹¥ï¥Ã¥×Îΰè¤Ï¥Ç¥Õ¥©¥ë¥È¤è¤ê¤â¹â¤¤
Í¥ÀèÅÙ¤ò»ý¤Ä¡£
Í¥ÀèÅÙ¤Ï
.I swapflags
¤Ë°Ê²¼¤Î¤è¤¦¤Ë¥³¡¼¥É²½¤µ¤ì¤Æ¤¤¤ë¡£
.br
.sp
.I "    (prio << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK"
.br
.PP
¤³¤ì¤é¤Î´Ø¿ô¤ÏÆø¢¥×¥í¥»¥¹
.RB ( CAP_SYS_ADMIN
¥±¡¼¥Ñ¥Ó¥ê¥Æ¥£ (capability) ¤ò»ý¤Ä¥×¥í¥»¥¹) ¤Î¤ß¤¬»ÈÍѤǤ­¤ë¡£
.SS Í¥ÀèÅÙ
¤½¤ì¤¾¤ì¤Î¥¹¥ï¥Ã¥×Îΰè¤Ï¹â (high) ¤ÈÄã (low) ¤Î¤É¤Á¤é¤«¤ÎÍ¥ÀèÅÙ¤ò»ý¤Ä¡£
¥Ç¥Õ¥©¥ë¥È¤ÎÍ¥ÀèÅÙ¤ÏÄã¤Ç¤¢¤ë¡£
Ä㤤ͥÀèÅÙ¤ÎÎΰè¤Ë¤ª¤¤¤Æ¡¢¿·¤·¤¤Îΰè¤Ï¸Å¤¤Îΰè¤è¤ê¤µ¤é¤ËÄ㤤
Í¥ÀèÅÙ¤ò»ý¤Ä¡£
.PP
.I swapflags
¤¬ÀßÄꤵ¤ì¤¿¤â¤Î¤ÏÁ´¤Æ¹â¤¤Í¥ÀèÅ٤Ȥʤꡢ¥Ç¥Õ¥©¥ë¥È¤è¤ê¤â¹â¤¤Í¥ÀèÅÙ¤ò»ý¤Ä¡£
»ÈÍѼԤϤ½¤ì¤é¤ËÉé¤Ç¤Ê¤¤Ãͤ¬»ØÄê¤Ç¤­¤ë¡£
Â礭¤Ê¿ô»ú¤Ï¹â¤¤Í¥ÀèÅÙ¤ò°ÕÌ£¤¹¤ë¡£
.PP
¹â¤¤Í¥ÀèÅÙ¤ÎÎΰ褫¤é½ç¤Ë¥¹¥ï¥Ã¥×¡¦¥Ú¡¼¥¸¤È¤·¤Æ»ÈÍѤµ¤ì¤ë¡£
¤è¤êÄ㤤ͥÀèÅÙ¤ÎÎΰè¤ò»ÈÍѤ¹¤ëÁ°¤Ë¤è¤ê¹â¤¤Í¥ÀèÅÙ¤Î
Îΰè¤ò»È¤¤Àڤ롣¤â¤·Æó¤Ä°Ê¾å¤ÎÎΰ褬Ʊ¤¸Í¥ÀèÅÙ¤ò»ý¤Á¡¢
»È¤¨¤ëÃæ¤Ç°ìÈֹ⤤ͥÀèÅ٤Ǥ¢¤ì¤Ð¡¢¤½¤ì¤é¤Î¥Ú¡¼¥¸¤Ï´Ö¤Ç
¥é¥¦¥ó¥É¡¦¥í¥Ó¥óÊý¼°¤ÇÇÛʬ¤µ¤ì¤ë¡£
.PP
Linux 1.3.6 ¤Ë¤ª¤¤¤Æ¡¢¥«¡¼¥Í¥ë¤ÏÄ̾ï¤Ï¤³¤ì¤é¤Îµ¬Â§¤Ë½¾¤Ã¤Æ¤¤¤ë¡£
¤·¤«¤·Îã³°¤â¸ºß¤·¤Æ¤¤¤ë¡£
.SH ÊÖ¤êÃÍ
À®¸ù¤·¤¿¾ì¹ç¤Ï 0 ¤¬ÊÖ¤µ¤ì¤ë¡£¥¨¥é¡¼¤Î¾ì¹ç¤Ï \-1 ¤¬ÊÖ¤µ¤ì¡¢
.I errno
¤¬Å¬ÀÚ¤ËÀßÄꤵ¤ì¤ë¡£
.SH ¥¨¥é¡¼
.TP
.B EBUSY
.RB ( swapon ()
¤Ë¤ª¤¤¤Æ) »ØÄꤵ¤ì¤¿
.I path
¤¬´û¤Ë¥¹¥ï¥Ã¥×Îΰè¤È¤·¤Æ»ÈÍѤµ¤ì¤Æ¤¤¤ë¡£
.TP
.B EINVAL
¥Õ¥¡¥¤¥ë
.I path
¤Ï¸ºß¤¹¤ë¤¬¡¢Ä̾ï¤Î¥Õ¥¡¥¤¥ë¤â¥Ö¥í¥Ã¥¯¡¦¥Ç¥Ð¥¤¥¹¤â»²¾È¤·¤Æ¤¤¤Ê¤¤¡£
¤Þ¤¿¤Ï
.BR swapon ()
¤Ë¤ª¤¤¤Æ¡¢»ØÄꤵ¤ì¤¿ path ¤Î¥Õ¥¡¥¤¥ë¤¬Í­¸ú¤Ê¥¹¥ï¥Ã¥×¤Î½ð̾ (signature) ¤ò
´Þ¤ó¤Ç¤¤¤Ê¤¤¤«¡¢tmpfs ¤Î¤è¤¦¤Ê¥¤¥ó¥á¥â¥ê (in-memory) ¤Î¥Õ¥¡¥¤¥ë¥·¥¹¥Æ¥à
¾å¤Ë¤¢¤ë¡£
¤Þ¤¿¤Ï
.BR swapoff ()
¤Ë¤ª¤¤¤Æ¡¢
.I path
¤¬¸½ºß¤Î¤È¤³¤í¥¹¥ï¥Ã¥×Îΰè¤Ç¤Ê¤¤¡£
.TP
.B ENFILE
¥ª¡¼¥×¥ó¤µ¤ì¤¿¥Õ¥¡¥¤¥ë¤ÎÁí¿ô¤¬¥·¥¹¥Æ¥à¤ÎÀ©¸Â¤Ë㤷¤¿¡£
.TP
.B ENOENT
¥Õ¥¡¥¤¥ë
.I path
¤¬Â¸ºß¤·¤Ê¤¤¡£
.TP
.B ENOMEM
¥¹¥ï¥Ã¥×¤ò³«»Ï¤¹¤ë¤Î¤Ë½½Ê¬¤Ê¥á¥â¥ê¡¼¤¬¥·¥¹¥Æ¥à¤Ë¤Ê¤¤¡£
.TP
.B EPERM
»ÈÍѼԤ¬
.B CAP_SYS_ADMIN
¥±¡¼¥Ñ¥Ó¥ê¥Æ¥£¤ò»ý¤Ã¤Æ¤¤¤Ê¤¤¡£
¤â¤·¤¯¤Ï¡¢ºÇÂç¿ô¤Î¥¹¥ï¥Ã¥×¥Õ¥¡¥¤¥ë¤¬¤¹¤Ç¤Ë»ÈÍѤµ¤ì¤Æ¤¤¤ë
(²¼µ­¤Î¡ÖÃí°Õ¡×¤ÎÀá¤ò»²¾È)¡£
.SH ½àµò
¤³¤ì¤é¤Î´Ø¿ô¤Ï Linux ÆÃÍ­¤Ç¤¢¤ê¡¢°Ü¿¢¤ò°Õ¿Þ¤·¤¿¥×¥í¥°¥é¥à¤Ç¤Ï
»ÈÍѤ·¤Æ¤Ï¤¤¤±¤Ê¤¤¡£
ÆóÈÖÌܤÎ
.I swapflags
°ú¤­¿ô¤Ï Linux 1.3.2 ¤«¤éƳÆþ¤µ¤ì¤¿¡£
.SH Ãí°Õ
¥Ñ¡¼¥Æ¥£¥·¥ç¥ó¤ä¥Ñ¥¹¤Ï
.BR mkswap (8)
¤Ë¤è¤Ã¤Æ½àÈ÷¤µ¤ì¤Æ¤¤¤Ê¤±¤ì¤Ð¤Ê¤é¤Ê¤¤¡£

»ÈÍѤǤ­¤ë¥¹¥ï¥Ã¥×¥Õ¥¡¥¤¥ë¤Î¿ô¤Ë¤Ï¾å¸Â¤¬¤¢¤ê¡¢¤½¤Î¾å¸Â¤Ï
¥«¡¼¥Í¥ëÄê¿ô
.B MAX_SWAPFILES
¤ÇÄêµÁ¤µ¤ì¤ë¡£
.B MAX_SWAPFILES
¤ÎÃͤϡ¢¥«¡¼¥Í¥ë 2.4.10 ¤è¤êÁ°¤Ç¤Ï 8¡¢
¥«¡¼¥Í¥ë 2.4.10 °Ê¹ß¤Ç¤Ï 32 ¤Ç¤¢¤ë¡£
¥«¡¼¥Í¥ë 2.6.18 °Ê¹ß¤Ç¤Ï¡¢¥«¡¼¥Í¥ë¤¬
.B CONFIG_MIGRATION
¥ª¥×¥·¥ç¥ó¤òÍ­¸ú¤Ë¤·¤ÆºîÀ®¤µ¤ì¤¿¾ì¹ç¡¢
¤³¤Î¾å¸Â¤¬ 2 ¾¯¤Ê¤¤ÃÍ (¤Ä¤Þ¤ê 30) ¤È¤Ê¤ë
(¤³¤Î¥«¡¼¥Í¥ë¤Ç¤Ï¡¢
.BR mbind (2)
¤È
.BR migrate_pages (2)
¤Î¥Ú¡¼¥¸¡¦¥Þ¥¤¥°¥ì¡¼¥·¥ç¥óµ¡Ç½ÍѤ˥¹¥ï¥Ã¥×¡¦¥Æ¡¼¥Ö¥ë¤Î¥¨¥ó¥È¥ê¡¼¤¬
Æó¤ÄͽÌ󤵤ì¤ë)¡£
.SH ´ØÏ¢¹àÌÜ
.BR mkswap (8),
.BR swapoff (8),
.BR swapon (8)