185 lines
5.7 KiB
C
185 lines
5.7 KiB
C
/*
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* This file is part of the SPL: Solaris Porting Layer.
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*
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* Copyright (c) 2008 Lawrence Livermore National Security, LLC.
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* Produced at Lawrence Livermore National Laboratory
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* Written by:
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* Brian Behlendorf <behlendorf1@llnl.gov>,
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* Herb Wartens <wartens2@llnl.gov>,
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* Jim Garlick <garlick@llnl.gov>
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* UCRL-CODE-235197
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*
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* This is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef _SPL_VMSYSTM_H
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#define _SPL_VMSYSTM_H
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#include <linux/mmzone.h>
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#include <linux/mm.h>
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#include <linux/swap.h>
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#include <linux/highmem.h>
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#include <sys/types.h>
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#include <asm/uaccess.h>
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/* These values are loosely coupled with the VM page reclaim.
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* Linux uses its own heuristics to trigger page reclamation, and
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* because those interface are difficult to interface with. These
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* values should only be considered as a rough guide to the system
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* memory state and not as direct evidence that page reclamation.
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* is or is not currently in progress.
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*/
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#define membar_producer() smp_wmb()
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#define physmem num_physpages
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#define freemem nr_free_pages()
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#define availrmem spl_kmem_availrmem()
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extern pgcnt_t minfree; /* Sum of zone->pages_min */
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extern pgcnt_t desfree; /* Sum of zone->pages_low */
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extern pgcnt_t lotsfree; /* Sum of zone->pages_high */
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extern pgcnt_t needfree; /* Always 0 unused in new Solaris */
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extern pgcnt_t swapfs_minfree; /* Solaris default value */
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extern pgcnt_t swapfs_reserve; /* Solaris default value */
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extern vmem_t *heap_arena; /* primary kernel heap arena */
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extern vmem_t *zio_alloc_arena; /* arena for zio caches */
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extern vmem_t *zio_arena; /* arena for allocating zio memory */
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extern pgcnt_t spl_kmem_availrmem(void);
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extern size_t vmem_size(vmem_t *vmp, int typemask);
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/*
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* The following symbols are available for use within the kernel
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* itself, and they used to be available in older kernels. But it
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* looks like they have been removed perhaps due to lack of use.
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* For our purposes we need them to access the global memory state
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* of the system, which is even available to user space process
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* in /proc/meminfo. It's odd to me that there is no kernel API
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* to get the same information, minimally the proc handler for
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* the above mentioned /proc/meminfo file would make use of it.
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*/
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/* Source linux/fs/proc/mmu.c */
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#ifndef HAVE_GET_VMALLOC_INFO
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#ifdef CONFIG_MMU
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struct vmalloc_info {
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unsigned long used;
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unsigned long largest_chunk;
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};
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typedef void (*get_vmalloc_info_t)(struct vmalloc_info *);
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extern get_vmalloc_info_t get_vmalloc_info_fn;
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# define VMEM_ALLOC 0x01
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# define VMEM_FREE 0x02
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# define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START)
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# define get_vmalloc_info(vmi) get_vmalloc_info_fn(vmi)
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#else
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# error "CONFIG_MMU must be defined"
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#endif /* CONFIG_MMU */
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#endif /* HAVE_GET_VMALLOC_INFO */
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#ifdef HAVE_PGDAT_HELPERS
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/* Source linux/mm/mmzone.c */
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# ifndef HAVE_FIRST_ONLINE_PGDAT
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typedef struct pglist_data *(*first_online_pgdat_t)(void);
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extern first_online_pgdat_t first_online_pgdat_fn;
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# define first_online_pgdat() first_online_pgdat_fn()
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# endif /* HAVE_FIRST_ONLINE_PGDAT */
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# ifndef HAVE_NEXT_ONLINE_PGDAT
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typedef struct pglist_data *(*next_online_pgdat_t)(struct pglist_data *);
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extern next_online_pgdat_t next_online_pgdat_fn;
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# define next_online_pgdat(pgd) next_online_pgdat_fn(pgd)
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# endif /* HAVE_NEXT_ONLINE_PGDAT */
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# ifndef HAVE_NEXT_ZONE
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typedef struct zone *(*next_zone_t)(struct zone *);
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extern next_zone_t next_zone_fn;
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# define next_zone(zone) next_zone_fn(zone)
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# endif /* HAVE_NEXT_ZONE */
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#else /* HAVE_PGDAT_HELPERS */
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# ifndef HAVE_PGDAT_LIST
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extern struct pglist_data *pgdat_list_addr;
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# define pgdat_list pgdat_list_addr
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# endif /* HAVE_PGDAT_LIST */
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#endif /* HAVE_PGDAT_HELPERS */
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/* Source linux/mm/vmstat.c */
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#ifndef HAVE_ZONE_STAT_ITEM_FIA
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# ifndef HAVE_GET_ZONE_COUNTS
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typedef void (*get_zone_counts_t)(unsigned long *, unsigned long *,
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unsigned long *);
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extern get_zone_counts_t get_zone_counts_fn;
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# define get_zone_counts(a,i,f) get_zone_counts_fn(a,i,f)
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# endif /* HAVE_GET_ZONE_COUNTS */
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extern unsigned long spl_global_page_state(int);
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/* Defines designed to simulate enum but large enough to ensure no overlap */
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# define NR_FREE_PAGES 0x8001
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# define NR_INACTIVE 0x8002
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# define NR_ACTIVE 0x8003
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#else
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#define spl_global_page_state(item) global_page_state(item)
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#endif /* HAVE_ZONE_STAT_ITEM_FIA */
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#define xcopyin(from, to, size) copy_from_user(to, from, size)
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#define xcopyout(from, to, size) copy_to_user(to, from, size)
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static __inline__ int
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copyin(const void *from, void *to, size_t len)
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{
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/* On error copyin routine returns -1 */
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if (xcopyin(from, to, len))
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return -1;
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return 0;
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}
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static __inline__ int
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copyout(const void *from, void *to, size_t len)
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{
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/* On error copyout routine returns -1 */
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if (xcopyout(from, to, len))
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return -1;
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return 0;
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}
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static __inline__ int
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copyinstr(const void *from, void *to, size_t len, size_t *done)
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{
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size_t rc;
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if (len == 0)
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return -ENAMETOOLONG;
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/* XXX: Should return ENAMETOOLONG if 'strlen(from) > len' */
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memset(to, 0, len);
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rc = copyin(from, to, len - 1);
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if (done != NULL)
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*done = rc;
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return 0;
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}
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#endif /* SPL_VMSYSTM_H */
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