+/*
+ * This file is part of the SPL: Solaris Porting Layer.
+ *
+ * Copyright (c) 2008 Lawrence Livermore National Security, LLC.
+ * Produced at Lawrence Livermore National Laboratory
+ * Written by:
+ * Brian Behlendorf <behlendorf1@llnl.gov>,
+ * Herb Wartens <wartens2@llnl.gov>,
+ * Jim Garlick <garlick@llnl.gov>
+ * UCRL-CODE-235197
+ *
+ * This is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
#ifndef _SPL_VMSYSTM_H
#define _SPL_VMSYSTM_H
+#include <linux/mmzone.h>
#include <linux/mm.h>
+#include <linux/swap.h>
+#include <linux/highmem.h>
#include <sys/types.h>
+#include <asm/uaccess.h>
-extern vmem_t *zio_alloc_arena; /* arena for zio caches */
+/* These values are loosely coupled with the VM page reclaim.
+ * Linux uses its own heuristics to trigger page reclamation, and
+ * because those interface are difficult to interface with. These
+ * values should only be considered as a rough guide to the system
+ * memory state and not as direct evidence that page reclamation.
+ * is or is not currently in progress.
+ */
+#define membar_producer() smp_wmb()
#define physmem num_physpages
-#define ptob(pages) (pages * PAGE_SIZE)
-#define membar_producer() smp_wmb()
+#define freemem nr_free_pages()
+#define availrmem spl_kmem_availrmem()
+
+extern pgcnt_t minfree; /* Sum of zone->pages_min */
+extern pgcnt_t desfree; /* Sum of zone->pages_low */
+extern pgcnt_t lotsfree; /* Sum of zone->pages_high */
+extern pgcnt_t needfree; /* Always 0 unused in new Solaris */
+extern pgcnt_t swapfs_minfree; /* Solaris default value */
+extern pgcnt_t swapfs_reserve; /* Solaris default value */
+
+extern vmem_t *heap_arena; /* primary kernel heap arena */
+extern vmem_t *zio_alloc_arena; /* arena for zio caches */
+extern vmem_t *zio_arena; /* arena for allocating zio memory */
+
+extern pgcnt_t spl_kmem_availrmem(void);
+extern size_t vmem_size(vmem_t *vmp, int typemask);
+
+/*
+ * The following symbols are available for use within the kernel
+ * itself, and they used to be available in older kernels. But it
+ * looks like they have been removed perhaps due to lack of use.
+ * For our purposes we need them to access the global memory state
+ * of the system, which is even available to user space process
+ * in /proc/meminfo. It's odd to me that there is no kernel API
+ * to get the same information, minimally the proc handler for
+ * the above mentioned /proc/meminfo file would make use of it.
+ */
+
+/* Source linux/fs/proc/mmu.c */
+#ifndef HAVE_GET_VMALLOC_INFO
+#ifdef CONFIG_MMU
+
+struct vmalloc_info {
+ unsigned long used;
+ unsigned long largest_chunk;
+};
+
+typedef void (*get_vmalloc_info_t)(struct vmalloc_info *);
+extern get_vmalloc_info_t get_vmalloc_info_fn;
+
+# define VMEM_ALLOC 0x01
+# define VMEM_FREE 0x02
+# define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START)
+# define get_vmalloc_info(vmi) get_vmalloc_info_fn(vmi)
+#else
+# error "CONFIG_MMU must be defined"
+#endif /* CONFIG_MMU */
+#endif /* HAVE_GET_VMALLOC_INFO */
+
+/* Source linux/mm/mmzone.c */
+#ifndef HAVE_FIRST_ONLINE_PGDAT
+typedef struct pglist_data *(*first_online_pgdat_t)(void);
+extern first_online_pgdat_t first_online_pgdat_fn;
+#define first_online_pgdat() first_online_pgdat_fn()
+#endif /* HAVE_FIRST_ONLINE_PGDAT */
+
+/* Source linux/mm/mmzone.c */
+#ifndef HAVE_NEXT_ONLINE_PGDAT
+typedef struct pglist_data *(*next_online_pgdat_t)(struct pglist_data *);
+extern next_online_pgdat_t next_online_pgdat_fn;
+#define next_online_pgdat(pgd) next_online_pgdat_fn(pgd)
+#endif /* HAVE_NEXT_ONLINE_PGDAT */
+
+/* Source linux/mm/mmzone.c */
+#ifndef HAVE_NEXT_ZONE
+typedef struct zone *(*next_zone_t)(struct zone *);
+extern next_zone_t next_zone_fn;
+#define next_zone(zone) next_zone_fn(zone)
+#endif /* HAVE_NEXT_ZONE */
+
+/* Source linux/mm/vmstat.c */
+#ifndef HAVE_ZONE_STAT_ITEM_FIA
+# ifndef HAVE_GET_ZONE_COUNTS
+typedef void (*get_zone_counts_t)(unsigned long *, unsigned long *,
+ unsigned long *);
+extern get_zone_counts_t get_zone_counts_fn;
+# define get_zone_counts(a,i,f) get_zone_counts_fn(a,i,f)
+
+extern unsigned long spl_global_page_state(int);
+/* Defines designed to simulate enum but large enough to ensure no overlap */
+# define NR_FREE_PAGES 0x8001
+# define NR_INACTIVE 0x8002
+# define NR_ACTIVE 0x8003
+# else
+# error "HAVE_ZONE_STAT_ITEM_FIA and HAVE_GET_ZONE_COUNTS unavailable"
+# endif /* HAVE_GET_ZONE_COUNTS */
+#else
+#define spl_global_page_state(item) global_page_state(item)
+#endif /* HAVE_ZONE_STAT_ITEM_FIA */
-#define copyin(from, to, size) copy_from_user(to, from, size)
-#define copyout(from, to, size) copy_to_user(to, from, size)
+#define xcopyin(from, to, size) copy_from_user(to, from, size)
+#define xcopyout(from, to, size) copy_to_user(to, from, size)
-#if 0
-/* The approximate total number of free pages */
-#define freemem 0
+static __inline__ int
+copyin(const void *from, void *to, size_t len)
+{
+ /* On error copyin routine returns -1 */
+ if (xcopyin(from, to, len))
+ return -1;
-/* The average number of free pages over the last 5 seconds */
-#define avefree 0
+ return 0;
+}
-/* The average number of free pages over the last 30 seconds */
-#define avefree30 0
+static __inline__ int
+copyout(const void *from, void *to, size_t len)
+{
+ /* On error copyout routine returns -1 */
+ if (xcopyout(from, to, len))
+ return -1;
-/* A guess as to how much memory has been promised to
- * processes but not yet allocated */
-#define deficit 0
+ return 0;
+}
-/* A guess as to how many page are needed to satisfy
- * stalled page creation requests */
-#define needfree 0
+static __inline__ int
+copyinstr(const void *from, void *to, size_t len, size_t *done)
+{
+ size_t rc;
-/* A bootlean the controls the setting of deficit */
-#define desperate
+ if (len == 0)
+ return -ENAMETOOLONG;
-/* When free memory is above this limit, no paging or swapping is done */
-#define lotsfree 0
+ /* XXX: Should return ENAMETOOLONG if 'strlen(from) > len' */
-/* When free memory is above this limit, swapping is not performed */
-#define desfree 0
+ memset(to, 0, len);
+ rc = copyin(from, to, len - 1);
+ if (done != NULL)
+ *done = rc;
-/* Threshold for many low memory tests, e.g. swapping is
- * more active below this limit */
-#define minfree 0
-#endif
+ return 0;
+}
#endif /* SPL_VMSYSTM_H */
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