sys/vm/vm_zone.h

   1 /*
   2  * Copyright (c) 1997, 1998 John S. Dyson
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *      notice immediately at the beginning of the file, without modification,
  10  *      this list of conditions, and the following disclaimer.
  11  * 2. Absolutely no warranty of function or purpose is made by the author
  12  *      John S. Dyson.
  13  *
  14  * $FreeBSD: src/sys/vm/vm_zone.h,v 1.13.2.2 2002/10/10 19:50:16 dillon Exp $
  15  * $DragonFly: src/sys/vm/vm_zone.h,v 1.10 2008/01/21 20:21:19 nth Exp $
  16  */
  17
  18 #ifndef _VM_VM_ZONE_H_
  19 #define _VM_VM_ZONE_H_
  20
  21 #define ZONE_INTERRUPT 0x0001   /* If you need to allocate at int time */
  22 #define ZONE_PANICFAIL 0x0002   /* panic if the zalloc fails */
  23 #define ZONE_SPECIAL   0x0004   /* special vm_map_entry zone, see zget() */
  24 #define ZONE_BOOT      0x0010   /* Internal flag used by zbootinit */
  25 #define ZONE_USE_RESERVE 0x0020 /* use reserve memory if necessary */
  26 #define ZONE_DESTROYABLE 0x0040 /* can be zdestroy()'ed */
  27
  28 #include <sys/spinlock.h>
  29 #include <sys/thread.h>
  30
  31 /*
  32  * Zone allocator.
  33  * Zones are deprecated, use <sys/objcache.h> instead for new developments.
  34  * Zones are not thread-safe; the mp lock must be held while calling
  35  * zone functions.
  36  */
  37 struct vm_zpcpu {
  38         void    *zitems;
  39         long    zfreecnt;
  40         long    znalloc;                /* allocations from pcpu */
  41 } __cachealign;
  42
  43 typedef struct vm_zpcpu vm_zpcpu_t;
  44
  45 typedef struct vm_zone {
  46         struct spinlock zlock;          /* lock for global portion */
  47         vm_zpcpu_t      zpcpu[SMP_MAXCPU];
  48         void            *zitems;        /* linked list of items */
  49         long            zfreecnt;       /* free entries */
  50         long            zfreemin;       /* minimum number of free entries */
  51         long            znalloc;        /* allocations from global */
  52         vm_offset_t     zkva;           /* Base kva of zone */
  53         vm_pindex_t     zpagecount;     /* Total # of allocated pages */
  54         vm_pindex_t     zpagemax;       /* Max address space */
  55         long            zmax;           /* Max number of entries allocated */
  56         long            zmax_pcpu;      /* Max pcpu cache */
  57         long            ztotal;         /* Total entries allocated now */
  58         long            zsize;          /* size of each entry */
  59         long            zalloc;         /* hint for # of pages to alloc */
  60         long            zflags;         /* flags for zone */
  61         uint32_t        zallocflag;     /* flag for allocation */
  62         struct vm_object *zobj;         /* object to hold zone */
  63         char            *zname;         /* name for diags */
  64         LIST_ENTRY(vm_zone) zlink;      /* link in zlist */
  65
  66         /*
  67          * The following fields track kmem_alloc()'ed blocks when
  68          * ZONE_DESTROYABLE set and normal zone (i.e. not ZONE_INTERRUPT nor
  69          * ZONE_SPECIAL).
  70          */
  71         vm_offset_t     *zkmvec;        /* krealloc()'ed array */
  72         long            zkmcur;         /* next free slot in zkmvec */
  73         long            zkmmax;         /* # of slots in zkmvec */
  74 } *vm_zone_t;
  75
  76
  77 void            zerror (int) __dead2;
  78 vm_zone_t       zinit (char *name, size_t size, long nentries, uint32_t flags);
  79 int             zinitna (vm_zone_t z, struct vm_object *obj, char *name,
  80                              size_t size, long nentries, uint32_t flags);
  81 void *          zalloc (vm_zone_t z);
  82 void            zfree (vm_zone_t z, void *item);
  83 void            zbootinit (vm_zone_t z, char *name, size_t size, void *item,
  84                                long nitems);
  85 void            zdestroy(vm_zone_t z);
  86
  87 #endif  /* _VM_VM_ZONE_H_ */