include/sys/vmsystm.h

   1 /*****************************************************************************\
   2  *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
   3  *  Copyright (C) 2007 The Regents of the University of California.
   4  *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
   5  *  Written by Brian Behlendorf <behlendorf1@llnl.gov>.
   6  *  UCRL-CODE-235197
   7  *
   8  *  This file is part of the SPL, Solaris Porting Layer.
   9  *  For details, see <http://zfsonlinux.org/>.
  10  *
  11  *  The SPL is free software; you can redistribute it and/or modify it
  12  *  under the terms of the GNU General Public License as published by the
  13  *  Free Software Foundation; either version 2 of the License, or (at your
  14  *  option) any later version.
  15  *
  16  *  The SPL is distributed in the hope that it will be useful, but WITHOUT
  17  *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  18  *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  19  *  for more details.
  20  *
  21  *  You should have received a copy of the GNU General Public License along
  22  *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
  23 \*****************************************************************************/
  24
  25 #ifndef _SPL_VMSYSTM_H
  26 #define _SPL_VMSYSTM_H
  27
  28 #include <linux/mmzone.h>
  29 #include <linux/mm.h>
  30 #include <linux/swap.h>
  31 #include <linux/highmem.h>
  32 #include <sys/types.h>
  33 #include <asm/uaccess.h>
  34
  35 /* These values are loosely coupled with the VM page reclaim.
  36  * Linux uses its own heuristics to trigger page reclamation, and
  37  * because those interface are difficult to interface with.  These
  38  * values should only be considered as a rough guide to the system
  39  * memory state and not as direct evidence that page reclamation.
  40  * is or is not currently in progress.
  41  */
  42 #define membar_producer()               smp_wmb()
  43
  44 #define physmem                         totalram_pages
  45 #define freemem                         nr_free_pages()
  46 #define availrmem                       spl_kmem_availrmem()
  47
  48 extern pgcnt_t minfree;                 /* Sum of zone->pages_min */
  49 extern pgcnt_t desfree;                 /* Sum of zone->pages_low */
  50 extern pgcnt_t lotsfree;                /* Sum of zone->pages_high */
  51 extern pgcnt_t needfree;                /* Always 0 unused in new Solaris */
  52 extern pgcnt_t swapfs_minfree;          /* Solaris default value */
  53 extern pgcnt_t swapfs_reserve;          /* Solaris default value */
  54
  55 extern vmem_t *heap_arena;              /* primary kernel heap arena */
  56 extern vmem_t *zio_alloc_arena;         /* arena for zio caches */
  57 extern vmem_t *zio_arena;               /* arena for allocating zio memory */
  58
  59 extern pgcnt_t spl_kmem_availrmem(void);
  60 extern size_t vmem_size(vmem_t *vmp, int typemask);
  61
  62 /*
  63  * The following symbols are available for use within the kernel
  64  * itself, and they used to be available in older kernels.  But it
  65  * looks like they have been removed perhaps due to lack of use.
  66  * For our purposes we need them to access the global memory state
  67  * of the system, which is even available to user space process
  68  * in /proc/meminfo.  It's odd to me that there is no kernel API
  69  * to get the same information, minimally the proc handler for
  70  * the above mentioned /proc/meminfo file would make use of it.
  71  */
  72
  73 /* Source linux/fs/proc/mmu.c */
  74 #ifndef HAVE_GET_VMALLOC_INFO
  75 #ifdef CONFIG_MMU
  76
  77 #ifndef HAVE_VMALLOC_INFO
  78 struct vmalloc_info {
  79         unsigned long used;
  80         unsigned long largest_chunk;
  81 };
  82 #endif
  83
  84 typedef void (*get_vmalloc_info_t)(struct vmalloc_info *);
  85 extern get_vmalloc_info_t get_vmalloc_info_fn;
  86
  87 # define VMEM_ALLOC             0x01
  88 # define VMEM_FREE              0x02
  89 # define VMALLOC_TOTAL          (VMALLOC_END - VMALLOC_START)
  90 # define get_vmalloc_info(vmi)  get_vmalloc_info_fn(vmi)
  91 #else
  92 # error "CONFIG_MMU must be defined"
  93 #endif /* CONFIG_MMU */
  94 #endif /* HAVE_GET_VMALLOC_INFO */
  95
  96 #ifdef HAVE_PGDAT_HELPERS
  97 /* Source linux/mm/mmzone.c */
  98 # ifndef HAVE_FIRST_ONLINE_PGDAT
  99 typedef struct pglist_data *(*first_online_pgdat_t)(void);
 100 extern first_online_pgdat_t first_online_pgdat_fn;
 101 # define first_online_pgdat()   first_online_pgdat_fn()
 102 # endif /* HAVE_FIRST_ONLINE_PGDAT */
 103
 104 # ifndef HAVE_NEXT_ONLINE_PGDAT
 105 typedef struct pglist_data *(*next_online_pgdat_t)(struct pglist_data *);
 106 extern next_online_pgdat_t next_online_pgdat_fn;
 107 # define next_online_pgdat(pgd) next_online_pgdat_fn(pgd)
 108 # endif /* HAVE_NEXT_ONLINE_PGDAT */
 109
 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 #else /* HAVE_PGDAT_HELPERS */
 117
 118 # ifndef HAVE_PGDAT_LIST
 119 extern struct pglist_data *pgdat_list_addr;
 120 # define pgdat_list             pgdat_list_addr
 121 # endif /* HAVE_PGDAT_LIST */
 122
 123 #endif /* HAVE_PGDAT_HELPERS */
 124
 125 /* Source linux/mm/vmstat.c */
 126 #if defined(NEED_GET_ZONE_COUNTS) && !defined(HAVE_GET_ZONE_COUNTS)
 127 typedef void (*get_zone_counts_t)(unsigned long *, unsigned long *,
 128                                   unsigned long *);
 129 extern get_zone_counts_t get_zone_counts_fn;
 130 # define get_zone_counts(a,i,f) get_zone_counts_fn(a,i,f)
 131 #endif /* NEED_GET_ZONE_COUNTS && !HAVE_GET_ZONE_COUNTS */
 132
 133 typedef enum spl_zone_stat_item {
 134         SPL_NR_FREE_PAGES,
 135         SPL_NR_INACTIVE,
 136         SPL_NR_ACTIVE,
 137         SPL_NR_ZONE_STAT_ITEMS
 138 } spl_zone_stat_item_t;
 139
 140 extern unsigned long spl_global_page_state(spl_zone_stat_item_t);
 141
 142 #define xcopyin(from, to, size)         copy_from_user(to, from, size)
 143 #define xcopyout(from, to, size)        copy_to_user(to, from, size)
 144
 145 static __inline__ int
 146 copyin(const void *from, void *to, size_t len)
 147 {
 148         /* On error copyin routine returns -1 */
 149         if (xcopyin(from, to, len))
 150                 return -1;
 151
 152         return 0;
 153 }
 154
 155 static __inline__ int
 156 copyout(const void *from, void *to, size_t len)
 157 {
 158         /* On error copyout routine returns -1 */
 159         if (xcopyout(from, to, len))
 160                 return -1;
 161
 162         return 0;
 163 }
 164
 165 static __inline__ int
 166 copyinstr(const void *from, void *to, size_t len, size_t *done)
 167 {
 168         size_t rc;
 169
 170         if (len == 0)
 171                 return -ENAMETOOLONG;
 172
 173         /* XXX: Should return ENAMETOOLONG if 'strlen(from) > len' */
 174
 175         memset(to, 0, len);
 176         rc = copyin(from, to, len - 1);
 177         if (done != NULL)
 178                 *done = rc;
 179
 180         return 0;
 181 }
 182
 183 #endif /* SPL_VMSYSTM_H */