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Basically everything we need to monitor the global memory state of the system is now cleanly available via global_page_state(). The problem is that this interface is still fairly recent, and there has been one change in the page state enum which we need to handle. These changes basically boil down to the following: - If global_page_state() is available we should use it. Several autoconf checks have been added to detect the correct enum names. - If global_page_state() is not available check to see if get_zone_counts() symbol is available and use that. - If the get_zone_counts() symbol is not exported we have no choice be to dynamically aquire it at load time. This is an absolute last resort for old kernel which we don't want to patch to cleanly export the symbol.
184 lines
5.6 KiB
C
184 lines
5.6 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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#if defined(NEED_GET_ZONE_COUNTS) && !defined(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 /* NEED_GET_ZONE_COUNTS && !HAVE_GET_ZONE_COUNTS */
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typedef enum spl_zone_stat_item {
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SPL_NR_FREE_PAGES,
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SPL_NR_INACTIVE,
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SPL_NR_ACTIVE,
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SPL_NR_ZONE_STAT_ITEMS
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} spl_zone_stat_item_t;
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extern unsigned long spl_global_page_state(spl_zone_stat_item_t);
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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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