2 * This file is part of the SPL: Solaris Porting Layer.
4 * Copyright (c) 2008 Lawrence Livermore National Security, LLC.
5 * Produced at Lawrence Livermore National Laboratory
7 * Brian Behlendorf <behlendorf1@llnl.gov>,
8 * Herb Wartens <wartens2@llnl.gov>,
9 * Jim Garlick <garlick@llnl.gov>
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.
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
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.
27 #ifndef _SPL_VMSYSTM_H
28 #define _SPL_VMSYSTM_H
30 #include <linux/mmzone.h>
32 #include <linux/swap.h>
33 #include <sys/types.h>
34 #include <asm/uaccess.h>
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.
43 #define membar_producer() smp_wmb()
45 #define physmem num_physpages
46 #define freemem nr_free_pages()
47 #define availrmem spl_kmem_availrmem()
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 */
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 */
60 extern pgcnt_t
spl_kmem_availrmem(void);
61 extern size_t vmem_size(vmem_t
*vmp
, int typemask
);
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.
74 /* Source linux/fs/proc/mmu.c */
75 #ifndef HAVE_GET_VMALLOC_INFO
80 unsigned long largest_chunk
;
83 typedef void (*get_vmalloc_info_t
)(struct vmalloc_info
*);
84 extern get_vmalloc_info_t get_vmalloc_info_fn
;
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)
91 # error "CONFIG_MMU must be defined"
92 #endif /* CONFIG_MMU */
93 #endif /* HAVE_GET_VMALLOC_INFO */
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 */
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 */
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 */
116 /* Source linux/mm/vmstat.c */
117 #ifndef HAVE_GET_ZONE_COUNTS
118 typedef void (*get_zone_counts_t
)(unsigned long *, 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 */
125 #define xcopyin(from, to, size) copy_from_user(to, from, size)
126 #define xcopyout(from, to, size) copy_to_user(to, from, size)
128 static __inline__
int
129 copyin(const void *from
, void *to
, size_t len
)
131 /* On error copyin routine returns -1 */
132 if (xcopyin(from
, to
, len
))
138 static __inline__
int
139 copyout(const void *from
, void *to
, size_t len
)
141 /* On error copyout routine returns -1 */
142 if (xcopyout(from
, to
, len
))
148 static __inline__
int
149 copyinstr(const void *from
, void *to
, size_t len
, size_t *done
)
154 return -ENAMETOOLONG
;
156 /* XXX: Should return ENAMETOOLONG if 'strlen(from) > len' */
159 rc
= copyin(from
, to
, len
- 1);
166 #endif /* SPL_VMSYSTM_H */