include/sys/vmsystm.h

   1 /*
   2  *  This file is part of the SPL: Solaris Porting Layer.
   3  *
   4  *  Copyright (c) 2008 Lawrence Livermore National Security, LLC.
   5  *  Produced at Lawrence Livermore National Laboratory
   6  *  Written by:
   7  *          Brian Behlendorf <behlendorf1@llnl.gov>,
   8  *          Herb Wartens <wartens2@llnl.gov>,
   9  *          Jim Garlick <garlick@llnl.gov>
  10  *  UCRL-CODE-235197
  11  *
  12  *  This is free software; you can redistribute it and/or modify it
  13  *  under the terms of the GNU General Public License as published by
  14  *  the Free Software Foundation; either version 2 of the License, or
  15  *  (at your option) any later version.
  16  *
  17  *  This is distributed in the hope that it will be useful, but WITHOUT
  18  *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  19  *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  20  *  for more details.
  21  *
  22  *  You should have received a copy of the GNU General Public License along
  23  *  with this program; if not, write to the Free Software Foundation, Inc.,
  24  *  51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA.
  25  */
  26
  27 #ifndef _SPL_VMSYSTM_H
  28 #define _SPL_VMSYSTM_H
  29
  30 #include <linux/mmzone.h>
  31 #include <linux/mm.h>
  32 #include <linux/swap.h>
  33 #include <sys/types.h>
  34 #include <asm/uaccess.h>
  35
  36 /* These values are loosely coupled with the the VM page reclaim.
  37  * Linux uses its own heuristics to trigger page reclamation, and
  38  * because those interface are difficult to interface with.  These
  39  * values should only be considered as a rough guide to the system
  40  * memory state and not as direct evidence that page reclaimation
  41  * is or is not currently in progress.
  42  */
  43 #define membar_producer()               smp_wmb()
  44
  45 #define physmem                         num_physpages
  46 #define freemem                         nr_free_pages()
  47 #define availrmem                       spl_kmem_availrmem()
  48
  49 extern pgcnt_t minfree;                 /* Sum of zone->pages_min */
  50 extern pgcnt_t desfree;                 /* Sum of zone->pages_low */
  51 extern pgcnt_t lotsfree;                /* Sum of zone->pages_high */
  52 extern pgcnt_t needfree;                /* Always 0 unused in new Solaris */
  53 extern pgcnt_t swapfs_minfree;          /* Solaris default value */
  54 extern pgcnt_t swapfs_reserve;          /* Solaris default value */
  55
  56 extern vmem_t *heap_arena;              /* primary kernel heap arena */
  57 extern vmem_t *zio_alloc_arena;         /* arena for zio caches */
  58 extern vmem_t *zio_arena;               /* arena for allocating zio memory */
  59
  60 extern pgcnt_t spl_kmem_availrmem(void);
  61 extern size_t vmem_size(vmem_t *vmp, int typemask);
  62
  63 /*
  64  * The following symbols are available for use within the kernel
  65  * itself, and they used to be available in older kernels.  But it
  66  * looks like they have been removed perhaps due to lack of use.
  67  * For our purposes we need them to access the global memory state
  68  * of the system, which is even available to user space process
  69  * in /proc/meminfo.  It's odd to me that there is no kernel API
  70  * to get the same information, minimally the proc handler for
  71  * the above mentioned /proc/meminfo file would make use of it.
  72  */
  73
  74 /* Source linux/fs/proc/mmu.c */
  75 #ifndef HAVE_GET_VMALLOC_INFO
  76 #ifdef CONFIG_MMU
  77
  78 struct vmalloc_info {
  79         unsigned long used;
  80         unsigned long largest_chunk;
  81 };
  82
  83 typedef void (*get_vmalloc_info_t)(struct vmalloc_info *);
  84 extern get_vmalloc_info_t get_vmalloc_info_fn;
  85
  86 # define VMEM_ALLOC             0x01
  87 # define VMEM_FREE              0x02
  88 # define VMALLOC_TOTAL          (VMALLOC_END - VMALLOC_START)
  89 # define get_vmalloc_info(vmi)  get_vmalloc_info_fn(vmi)
  90 #else
  91 # error "CONFIG_MMU must be defined"
  92 #endif /* CONFIG_MMU */
  93 #endif /* HAVE_GET_VMALLOC_INFO */
  94
  95 /* Source linux/mm/mmzone.c */
  96 #ifndef HAVE_FIRST_ONLINE_PGDAT
  97 typedef struct pglist_data *(*first_online_pgdat_t)(void);
  98 extern first_online_pgdat_t first_online_pgdat_fn;
  99 #define first_online_pgdat()    first_online_pgdat_fn()
 100 #endif /* HAVE_FIRST_ONLINE_PGDAT */
 101
 102 /* Source linux/mm/mmzone.c */
 103 #ifndef HAVE_NEXT_ONLINE_PGDAT
 104 typedef struct pglist_data *(*next_online_pgdat_t)(struct pglist_data *);
 105 extern next_online_pgdat_t next_online_pgdat_fn;
 106 #define next_online_pgdat(pgd)  next_online_pgdat_fn(pgd)
 107 #endif /* HAVE_NEXT_ONLINE_PGDAT */
 108
 109 /* Source linux/mm/mmzone.c */
 110 #ifndef HAVE_NEXT_ZONE
 111 typedef struct zone *(*next_zone_t)(struct zone *);
 112 extern next_zone_t next_zone_fn;
 113 #define next_zone(zone)         next_zone_fn(zone)
 114 #endif /* HAVE_NEXT_ZONE */
 115
 116 /* Source linux/mm/vmstat.c */
 117 #ifndef HAVE_GET_ZONE_COUNTS
 118 typedef void (*get_zone_counts_t)(unsigned long *, unsigned long *,
 119                                   unsigned long *);
 120 extern get_zone_counts_t get_zone_counts_fn;
 121 #define get_zone_counts(a,i,f)  get_zone_counts_fn(a,i,f)
 122 #endif /* HAVE_GET_ZONE_COUNTS */
 123
 124
 125 #define xcopyin(from, to, size)         copy_from_user(to, from, size)
 126 #define xcopyout(from, to, size)        copy_to_user(to, from, size)
 127
 128 static __inline__ int
 129 copyin(const void *from, void *to, size_t len)
 130 {
 131         /* On error copyin routine returns -1 */
 132         if (xcopyin(from, to, len))
 133                 return -1;
 134
 135         return 0;
 136 }
 137
 138 static __inline__ int
 139 copyout(const void *from, void *to, size_t len)
 140 {
 141         /* On error copyout routine returns -1 */
 142         if (xcopyout(from, to, len))
 143                 return -1;
 144
 145         return 0;
 146 }
 147
 148 static __inline__ int
 149 copyinstr(const void *from, void *to, size_t len, size_t *done)
 150 {
 151         size_t rc;
 152
 153         if (len == 0)
 154                 return -ENAMETOOLONG;
 155
 156         /* XXX: Should return ENAMETOOLONG if 'strlen(from) > len' */
 157
 158         memset(to, 0, len);
 159         rc = copyin(from, to, len - 1);
 160         if (done != NULL)
 161                 *done = rc;
 162
 163         return 0;
 164 }
 165
 166 #endif /* SPL_VMSYSTM_H */