5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */



  25 
  26 #include <sys/types.h>
  27 #include <sys/param.h>
  28 #include <sys/systm.h>
  29 #include <sys/errno.h>
  30 #include <sys/kmem.h>
  31 #include <sys/vnode.h>
  32 #include <sys/vfs_opreg.h>
  33 #include <sys/swap.h>
  34 #include <sys/sysmacros.h>
  35 #include <sys/buf.h>
  36 #include <sys/callb.h>
  37 #include <sys/debug.h>
  38 #include <vm/seg.h>
  39 #include <sys/fs/swapnode.h>
  40 #include <fs/fs_subr.h>
  41 #include <sys/cmn_err.h>
  42 #include <sys/mem_config.h>
  43 #include <sys/atomic.h>
  44 
  45 extern const fs_operation_def_t swap_vnodeops_template[];
  46 
  47 /*
  48  * swapfs_minfree is the amount of physical memory (actually remaining
  49  * availrmem) that we want to keep free for the rest of the system.  This
  50  * means that swapfs can only grow to availrmem - swapfs_minfree.  This
  51  * can be set as just constant value or a certain percentage of installed
  52  * physical memory. It is set in swapinit().
  53  *
  54  * Users who want to change the amount of memory that can be used as swap
  55  * space should do so by setting swapfs_desfree at boot time,
  56  * not swapfs_minfree.
  57  */
  58 
  59 pgcnt_t swapfs_desfree = 0;
  60 pgcnt_t swapfs_minfree = 0;
  61 pgcnt_t swapfs_reserve = 0;
  62 
  63 #ifdef SWAPFS_DEBUG
  64 int swapfs_debug;
  65 #endif /* SWAPFS_DEBUG */
  66 
  67 
  68 static int swapfs_vpcount;
  69 static kmutex_t swapfs_lock;
  70 static struct async_reqs *sw_ar, *sw_pendlist, *sw_freelist;
  71 
  72 static struct vnode **swap_vnodes;      /* ptr's to swap vnodes */
  73 
  74 static void swap_init_mem_config(void);
  75 
  76 static pgcnt_t initial_swapfs_desfree;
  77 static pgcnt_t initial_swapfs_minfree;
  78 static pgcnt_t initial_swapfs_reserve;
  79 
  80 static int swap_sync(struct vfs *vfsp, short flag, struct cred *cr);
  81 

   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25 /*
  26  * Copyright 2013 Nexenta Systems, Inc.  All rights reserved.
  27  */
  28 
  29 #include <sys/types.h>
  30 #include <sys/param.h>
  31 #include <sys/systm.h>
  32 #include <sys/errno.h>
  33 #include <sys/kmem.h>
  34 #include <sys/vnode.h>
  35 #include <sys/vfs_opreg.h>
  36 #include <sys/swap.h>
  37 #include <sys/sysmacros.h>
  38 #include <sys/buf.h>
  39 #include <sys/callb.h>
  40 #include <sys/debug.h>
  41 #include <vm/seg.h>
  42 #include <sys/fs/swapnode.h>
  43 #include <fs/fs_subr.h>
  44 #include <sys/cmn_err.h>
  45 #include <sys/mem_config.h>
  46 #include <sys/atomic.h>
  47 
  48 extern const fs_operation_def_t swap_vnodeops_template[];
  49 
  50 /*
  51  * swapfs_minfree is the amount of physical memory (actually remaining
  52  * availrmem) that we want to keep free for the rest of the system.  This
  53  * means that swapfs can only grow to availrmem - swapfs_minfree.  This
  54  * can be set as just constant value or a certain percentage of installed
  55  * physical memory. It is set in swapinit().
  56  *
  57  * Users who want to change the amount of memory that can be used as swap
  58  * space should do so by setting swapfs_desfree at boot time,
  59  * not swapfs_minfree.
  60  */
  61 
  62 pgcnt_t swapfs_desfree = 0;
  63 volatile pgcnt_t swapfs_minfree = 0;
  64 volatile pgcnt_t swapfs_reserve = 0;
  65 
  66 #ifdef SWAPFS_DEBUG
  67 int swapfs_debug;
  68 #endif /* SWAPFS_DEBUG */
  69 
  70 
  71 static int swapfs_vpcount;
  72 static kmutex_t swapfs_lock;
  73 static struct async_reqs *sw_ar, *sw_pendlist, *sw_freelist;
  74 
  75 static struct vnode **swap_vnodes;      /* ptr's to swap vnodes */
  76 
  77 static void swap_init_mem_config(void);
  78 
  79 static pgcnt_t initial_swapfs_desfree;
  80 static pgcnt_t initial_swapfs_minfree;
  81 static pgcnt_t initial_swapfs_reserve;
  82 
  83 static int swap_sync(struct vfs *vfsp, short flag, struct cred *cr);
  84