The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/vm/uma.h

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    1 /*-
    2  * Copyright (c) 2002, 2003, 2004, 2005 Jeffrey Roberson <jeff@FreeBSD.org>
    3  * Copyright (c) 2004, 2005 Bosko Milekic <bmilekic@FreeBSD.org>
    4  * All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice unmodified, this list of conditions, and the following
   11  *    disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   26  *
   27  * $FreeBSD: releng/9.1/sys/vm/uma.h 232066 2012-02-23 19:20:36Z kmacy $
   28  *
   29  */
   30 
   31 /*
   32  * uma.h - External definitions for the Universal Memory Allocator
   33  *
   34 */
   35 
   36 #ifndef VM_UMA_H
   37 #define VM_UMA_H
   38 
   39 #include <sys/param.h>          /* For NULL */
   40 #include <sys/malloc.h>         /* For M_* */
   41 
   42 /* User visible parameters */
   43 #define UMA_SMALLEST_UNIT       (PAGE_SIZE / 256) /* Smallest item allocated */
   44 
   45 /* Types and type defs */
   46 
   47 struct uma_zone;
   48 /* Opaque type used as a handle to the zone */
   49 typedef struct uma_zone * uma_zone_t;
   50 
   51 void zone_drain(uma_zone_t);
   52 
   53 /* 
   54  * Item constructor
   55  *
   56  * Arguments:
   57  *      item  A pointer to the memory which has been allocated.
   58  *      arg   The arg field passed to uma_zalloc_arg
   59  *      size  The size of the allocated item
   60  *      flags See zalloc flags
   61  * 
   62  * Returns:
   63  *      0      on success
   64  *      errno  on failure
   65  *
   66  * Discussion:
   67  *      The constructor is called just before the memory is returned
   68  *      to the user. It may block if necessary.
   69  */
   70 typedef int (*uma_ctor)(void *mem, int size, void *arg, int flags);
   71 
   72 /*
   73  * Item destructor
   74  *
   75  * Arguments:
   76  *      item  A pointer to the memory which has been allocated.
   77  *      size  The size of the item being destructed.
   78  *      arg   Argument passed through uma_zfree_arg
   79  * 
   80  * Returns:
   81  *      Nothing
   82  *
   83  * Discussion:
   84  *      The destructor may perform operations that differ from those performed
   85  *      by the initializer, but it must leave the object in the same state.
   86  *      This IS type stable storage.  This is called after EVERY zfree call.
   87  */
   88 typedef void (*uma_dtor)(void *mem, int size, void *arg);
   89 
   90 /* 
   91  * Item initializer
   92  *
   93  * Arguments:
   94  *      item  A pointer to the memory which has been allocated.
   95  *      size  The size of the item being initialized.
   96  *      flags See zalloc flags
   97  * 
   98  * Returns:
   99  *      0      on success
  100  *      errno  on failure
  101  *
  102  * Discussion:
  103  *      The initializer is called when the memory is cached in the uma zone. 
  104  *      The initializer and the destructor should leave the object in the same
  105  *      state.
  106  */
  107 typedef int (*uma_init)(void *mem, int size, int flags);
  108 
  109 /*
  110  * Item discard function
  111  *
  112  * Arguments:
  113  *      item  A pointer to memory which has been 'freed' but has not left the 
  114  *            zone's cache.
  115  *      size  The size of the item being discarded.
  116  *
  117  * Returns:
  118  *      Nothing
  119  *
  120  * Discussion:
  121  *      This routine is called when memory leaves a zone and is returned to the
  122  *      system for other uses.  It is the counter-part to the init function.
  123  */
  124 typedef void (*uma_fini)(void *mem, int size);
  125 
  126 /*
  127  * What's the difference between initializing and constructing?
  128  *
  129  * The item is initialized when it is cached, and this is the state that the 
  130  * object should be in when returned to the allocator. The purpose of this is
  131  * to remove some code which would otherwise be called on each allocation by
  132  * utilizing a known, stable state.  This differs from the constructor which
  133  * will be called on EVERY allocation.
  134  *
  135  * For example, in the initializer you may want to initialize embedded locks,
  136  * NULL list pointers, set up initial states, magic numbers, etc.  This way if
  137  * the object is held in the allocator and re-used it won't be necessary to
  138  * re-initialize it.
  139  *
  140  * The constructor may be used to lock a data structure, link it on to lists,
  141  * bump reference counts or total counts of outstanding structures, etc.
  142  *
  143  */
  144 
  145 
  146 /* Function proto types */
  147 
  148 /*
  149  * Create a new uma zone
  150  *
  151  * Arguments:
  152  *      name  The text name of the zone for debugging and stats. This memory
  153  *              should not be freed until the zone has been deallocated.
  154  *      size  The size of the object that is being created.
  155  *      ctor  The constructor that is called when the object is allocated.
  156  *      dtor  The destructor that is called when the object is freed.
  157  *      init  An initializer that sets up the initial state of the memory.
  158  *      fini  A discard function that undoes initialization done by init.
  159  *              ctor/dtor/init/fini may all be null, see notes above.
  160  *      align A bitmask that corresponds to the requested alignment
  161  *              eg 4 would be 0x3
  162  *      flags A set of parameters that control the behavior of the zone.
  163  *
  164  * Returns:
  165  *      A pointer to a structure which is intended to be opaque to users of
  166  *      the interface.  The value may be null if the wait flag is not set.
  167  */
  168 uma_zone_t uma_zcreate(char *name, size_t size, uma_ctor ctor, uma_dtor dtor,
  169                         uma_init uminit, uma_fini fini, int align,
  170                         u_int32_t flags);
  171 
  172 /*
  173  * Create a secondary uma zone
  174  *
  175  * Arguments:
  176  *      name  The text name of the zone for debugging and stats. This memory
  177  *              should not be freed until the zone has been deallocated.
  178  *      ctor  The constructor that is called when the object is allocated.
  179  *      dtor  The destructor that is called when the object is freed.
  180  *      zinit  An initializer that sets up the initial state of the memory
  181  *              as the object passes from the Keg's slab to the Zone's cache.
  182  *      zfini  A discard function that undoes initialization done by init
  183  *              as the object passes from the Zone's cache to the Keg's slab.
  184  *
  185  *              ctor/dtor/zinit/zfini may all be null, see notes above.
  186  *              Note that the zinit and zfini specified here are NOT
  187  *              exactly the same as the init/fini specified to uma_zcreate()
  188  *              when creating a master zone.  These zinit/zfini are called
  189  *              on the TRANSITION from keg to zone (and vice-versa). Once
  190  *              these are set, the primary zone may alter its init/fini
  191  *              (which are called when the object passes from VM to keg)
  192  *              using uma_zone_set_init/fini()) as well as its own
  193  *              zinit/zfini (unset by default for master zone) with
  194  *              uma_zone_set_zinit/zfini() (note subtle 'z' prefix).
  195  *
  196  *      master  A reference to this zone's Master Zone (Primary Zone),
  197  *              which contains the backing Keg for the Secondary Zone
  198  *              being added.
  199  *
  200  * Returns:
  201  *      A pointer to a structure which is intended to be opaque to users of
  202  *      the interface.  The value may be null if the wait flag is not set.
  203  */
  204 uma_zone_t uma_zsecond_create(char *name, uma_ctor ctor, uma_dtor dtor,
  205                     uma_init zinit, uma_fini zfini, uma_zone_t master);
  206 
  207 /*
  208  * Add a second master to a secondary zone.  This provides multiple data
  209  * backends for objects with the same size.  Both masters must have
  210  * compatible allocation flags.  Presently, UMA_ZONE_MALLOC type zones are
  211  * the only supported.
  212  *
  213  * Returns:
  214  *      Error on failure, 0 on success.
  215  */
  216 int uma_zsecond_add(uma_zone_t zone, uma_zone_t master);
  217 
  218 /*
  219  * Definitions for uma_zcreate flags
  220  *
  221  * These flags share space with UMA_ZFLAGs in uma_int.h.  Be careful not to
  222  * overlap when adding new features.  0xf0000000 is in use by uma_int.h.
  223  */
  224 #define UMA_ZONE_PAGEABLE       0x0001  /* Return items not fully backed by
  225                                            physical memory XXX Not yet */
  226 #define UMA_ZONE_ZINIT          0x0002  /* Initialize with zeros */
  227 #define UMA_ZONE_STATIC         0x0004  /* Statically sized zone */
  228 #define UMA_ZONE_OFFPAGE        0x0008  /* Force the slab structure allocation
  229                                            off of the real memory */
  230 #define UMA_ZONE_MALLOC         0x0010  /* For use by malloc(9) only! */
  231 #define UMA_ZONE_NOFREE         0x0020  /* Do not free slabs of this type! */
  232 #define UMA_ZONE_MTXCLASS       0x0040  /* Create a new lock class */
  233 #define UMA_ZONE_VM             0x0080  /*
  234                                          * Used for internal vm datastructures
  235                                          * only.
  236                                          */
  237 #define UMA_ZONE_HASH           0x0100  /*
  238                                          * Use a hash table instead of caching
  239                                          * information in the vm_page.
  240                                          */
  241 #define UMA_ZONE_SECONDARY      0x0200  /* Zone is a Secondary Zone */
  242 #define UMA_ZONE_REFCNT         0x0400  /* Allocate refcnts in slabs */
  243 #define UMA_ZONE_MAXBUCKET      0x0800  /* Use largest buckets */
  244 #define UMA_ZONE_CACHESPREAD    0x1000  /*
  245                                          * Spread memory start locations across
  246                                          * all possible cache lines.  May
  247                                          * require many virtually contiguous
  248                                          * backend pages and can fail early.
  249                                          */
  250 #define UMA_ZONE_VTOSLAB        0x2000  /* Zone uses vtoslab for lookup. */
  251 #define UMA_ZONE_NODUMP         0x4000  /*
  252                                          * Zone's pages will not be included in
  253                                          * mini-dumps.
  254                                          */
  255 
  256 /*
  257  * These flags are shared between the keg and zone.  In zones wishing to add
  258  * new kegs these flags must be compatible.  Some are determined based on
  259  * physical parameters of the request and may not be provided by the consumer.
  260  */
  261 #define UMA_ZONE_INHERIT                                                \
  262     (UMA_ZONE_OFFPAGE | UMA_ZONE_MALLOC | UMA_ZONE_HASH |               \
  263     UMA_ZONE_REFCNT | UMA_ZONE_VTOSLAB)
  264 
  265 /* Definitions for align */
  266 #define UMA_ALIGN_PTR   (sizeof(void *) - 1)    /* Alignment fit for ptr */
  267 #define UMA_ALIGN_LONG  (sizeof(long) - 1)      /* "" long */
  268 #define UMA_ALIGN_INT   (sizeof(int) - 1)       /* "" int */
  269 #define UMA_ALIGN_SHORT (sizeof(short) - 1)     /* "" short */
  270 #define UMA_ALIGN_CHAR  (sizeof(char) - 1)      /* "" char */
  271 #define UMA_ALIGN_CACHE (0 - 1)                 /* Cache line size align */
  272 
  273 /*
  274  * Destroys an empty uma zone.  If the zone is not empty uma complains loudly.
  275  *
  276  * Arguments:
  277  *      zone  The zone we want to destroy.
  278  *
  279  */
  280 void uma_zdestroy(uma_zone_t zone);
  281 
  282 /*
  283  * Allocates an item out of a zone
  284  *
  285  * Arguments:
  286  *      zone  The zone we are allocating from
  287  *      arg   This data is passed to the ctor function
  288  *      flags See sys/malloc.h for available flags.
  289  *
  290  * Returns:
  291  *      A non-null pointer to an initialized element from the zone is
  292  *      guaranteed if the wait flag is M_WAITOK.  Otherwise a null pointer
  293  *      may be returned if the zone is empty or the ctor failed.
  294  */
  295 
  296 void *uma_zalloc_arg(uma_zone_t zone, void *arg, int flags);
  297 
  298 /*
  299  * Allocates an item out of a zone without supplying an argument
  300  *
  301  * This is just a wrapper for uma_zalloc_arg for convenience.
  302  *
  303  */
  304 static __inline void *uma_zalloc(uma_zone_t zone, int flags);
  305 
  306 static __inline void *
  307 uma_zalloc(uma_zone_t zone, int flags)
  308 {
  309         return uma_zalloc_arg(zone, NULL, flags);
  310 }
  311 
  312 /*
  313  * Frees an item back into the specified zone.
  314  *
  315  * Arguments:
  316  *      zone  The zone the item was originally allocated out of.
  317  *      item  The memory to be freed.
  318  *      arg   Argument passed to the destructor
  319  *
  320  * Returns:
  321  *      Nothing.
  322  */
  323 
  324 void uma_zfree_arg(uma_zone_t zone, void *item, void *arg);
  325 
  326 /*
  327  * Frees an item back to a zone without supplying an argument
  328  *
  329  * This is just a wrapper for uma_zfree_arg for convenience.
  330  *
  331  */
  332 static __inline void uma_zfree(uma_zone_t zone, void *item);
  333 
  334 static __inline void
  335 uma_zfree(uma_zone_t zone, void *item)
  336 {
  337         uma_zfree_arg(zone, item, NULL);
  338 }
  339 
  340 /*
  341  * XXX The rest of the prototypes in this header are h0h0 magic for the VM.
  342  * If you think you need to use it for a normal zone you're probably incorrect.
  343  */
  344 
  345 /*
  346  * Backend page supplier routines
  347  *
  348  * Arguments:
  349  *      zone  The zone that is requesting pages.
  350  *      size  The number of bytes being requested.
  351  *      pflag Flags for these memory pages, see below.
  352  *      wait  Indicates our willingness to block.
  353  *
  354  * Returns:
  355  *      A pointer to the allocated memory or NULL on failure.
  356  */
  357 
  358 typedef void *(*uma_alloc)(uma_zone_t zone, int size, u_int8_t *pflag, int wait);
  359 
  360 /*
  361  * Backend page free routines
  362  *
  363  * Arguments:
  364  *      item  A pointer to the previously allocated pages.
  365  *      size  The original size of the allocation.
  366  *      pflag The flags for the slab.  See UMA_SLAB_* below.
  367  *
  368  * Returns:
  369  *      None
  370  */
  371 typedef void (*uma_free)(void *item, int size, u_int8_t pflag);
  372 
  373 
  374 
  375 /*
  376  * Sets up the uma allocator. (Called by vm_mem_init)
  377  *
  378  * Arguments:
  379  *      bootmem  A pointer to memory used to bootstrap the system.
  380  *
  381  * Returns:
  382  *      Nothing
  383  *
  384  * Discussion:
  385  *      This memory is used for zones which allocate things before the
  386  *      backend page supplier can give us pages.  It should be
  387  *      UMA_SLAB_SIZE * boot_pages bytes. (see uma_int.h)
  388  *
  389  */
  390 
  391 void uma_startup(void *bootmem, int boot_pages);
  392 
  393 /*
  394  * Finishes starting up the allocator.  This should
  395  * be called when kva is ready for normal allocs.
  396  *
  397  * Arguments:
  398  *      None
  399  *
  400  * Returns:
  401  *      Nothing
  402  *
  403  * Discussion:
  404  *      uma_startup2 is called by kmeminit() to enable us of uma for malloc.
  405  */
  406  
  407 void uma_startup2(void);
  408 
  409 /*
  410  * Reclaims unused memory for all zones
  411  *
  412  * Arguments:
  413  *      None
  414  * Returns:
  415  *      None
  416  *
  417  * This should only be called by the page out daemon.
  418  */
  419 
  420 void uma_reclaim(void);
  421 
  422 /*
  423  * Sets the alignment mask to be used for all zones requesting cache
  424  * alignment.  Should be called by MD boot code prior to starting VM/UMA.
  425  *
  426  * Arguments:
  427  *      align The alignment mask
  428  *
  429  * Returns:
  430  *      Nothing
  431  */
  432 void uma_set_align(int align);
  433 
  434 /*
  435  * Switches the backing object of a zone
  436  *
  437  * Arguments:
  438  *      zone  The zone to update.
  439  *      obj   The VM object to use for future allocations.
  440  *      size  The size of the object to allocate.
  441  *
  442  * Returns:
  443  *      0  if kva space can not be allocated
  444  *      1  if successful
  445  *
  446  * Discussion:
  447  *      A NULL object can be used and uma will allocate one for you.  Setting
  448  *      the size will limit the amount of memory allocated to this zone.
  449  *
  450  */
  451 struct vm_object;
  452 int uma_zone_set_obj(uma_zone_t zone, struct vm_object *obj, int size);
  453 
  454 /*
  455  * Sets a high limit on the number of items allowed in a zone
  456  *
  457  * Arguments:
  458  *      zone  The zone to limit
  459  *      nitems  The requested upper limit on the number of items allowed
  460  *
  461  * Returns:
  462  *      int  The effective value of nitems after rounding up based on page size
  463  */
  464 int uma_zone_set_max(uma_zone_t zone, int nitems);
  465 
  466 /*
  467  * Obtains the effective limit on the number of items in a zone
  468  *
  469  * Arguments:
  470  *      zone  The zone to obtain the effective limit from
  471  *
  472  * Return:
  473  *      0  No limit
  474  *      int  The effective limit of the zone
  475  */
  476 int uma_zone_get_max(uma_zone_t zone);
  477 
  478 /*
  479  * Obtains the approximate current number of items allocated from a zone
  480  *
  481  * Arguments:
  482  *      zone  The zone to obtain the current allocation count from
  483  *
  484  * Return:
  485  *      int  The approximate current number of items allocated from the zone
  486  */
  487 int uma_zone_get_cur(uma_zone_t zone);
  488 
  489 /*
  490  * The following two routines (uma_zone_set_init/fini)
  491  * are used to set the backend init/fini pair which acts on an
  492  * object as it becomes allocated and is placed in a slab within
  493  * the specified zone's backing keg.  These should probably not
  494  * be changed once allocations have already begun, but only be set
  495  * immediately upon zone creation.
  496  */
  497 void uma_zone_set_init(uma_zone_t zone, uma_init uminit);
  498 void uma_zone_set_fini(uma_zone_t zone, uma_fini fini);
  499 
  500 /*
  501  * The following two routines (uma_zone_set_zinit/zfini) are
  502  * used to set the zinit/zfini pair which acts on an object as
  503  * it passes from the backing Keg's slab cache to the
  504  * specified Zone's bucket cache.  These should probably not
  505  * be changed once allocations have already begun, but only be set
  506  * immediately upon zone creation.
  507  */
  508 void uma_zone_set_zinit(uma_zone_t zone, uma_init zinit);
  509 void uma_zone_set_zfini(uma_zone_t zone, uma_fini zfini);
  510 
  511 /*
  512  * Replaces the standard page_alloc or obj_alloc functions for this zone
  513  *
  514  * Arguments:
  515  *      zone   The zone whose backend allocator is being changed.
  516  *      allocf A pointer to the allocation function
  517  *
  518  * Returns:
  519  *      Nothing
  520  *
  521  * Discussion:
  522  *      This could be used to implement pageable allocation, or perhaps
  523  *      even DMA allocators if used in conjunction with the OFFPAGE
  524  *      zone flag.
  525  */
  526 
  527 void uma_zone_set_allocf(uma_zone_t zone, uma_alloc allocf);
  528 
  529 /*
  530  * Used for freeing memory provided by the allocf above
  531  *
  532  * Arguments:
  533  *      zone  The zone that intends to use this free routine.
  534  *      freef The page freeing routine.
  535  *
  536  * Returns:
  537  *      Nothing
  538  */
  539 
  540 void uma_zone_set_freef(uma_zone_t zone, uma_free freef);
  541 
  542 /*
  543  * These flags are setable in the allocf and visible in the freef.
  544  */
  545 #define UMA_SLAB_BOOT   0x01            /* Slab alloced from boot pages */
  546 #define UMA_SLAB_KMEM   0x02            /* Slab alloced from kmem_map */
  547 #define UMA_SLAB_KERNEL 0x04            /* Slab alloced from kernel_map */
  548 #define UMA_SLAB_PRIV   0x08            /* Slab alloced from priv allocator */
  549 #define UMA_SLAB_OFFP   0x10            /* Slab is managed separately  */
  550 #define UMA_SLAB_MALLOC 0x20            /* Slab is a large malloc slab */
  551 /* 0x40 and 0x80 are available */
  552 
  553 /*
  554  * Used to pre-fill a zone with some number of items
  555  *
  556  * Arguments:
  557  *      zone    The zone to fill
  558  *      itemcnt The number of items to reserve
  559  *
  560  * Returns:
  561  *      Nothing
  562  *
  563  * NOTE: This is blocking and should only be done at startup
  564  */
  565 void uma_prealloc(uma_zone_t zone, int itemcnt);
  566 
  567 /*
  568  * Used to lookup the reference counter allocated for an item
  569  * from a UMA_ZONE_REFCNT zone.  For UMA_ZONE_REFCNT zones,
  570  * reference counters are allocated for items and stored in
  571  * the underlying slab header.
  572  *
  573  * Arguments:
  574  *      zone  The UMA_ZONE_REFCNT zone to which the item belongs.
  575  *      item  The address of the item for which we want a refcnt.
  576  *
  577  * Returns:
  578  *      A pointer to a u_int32_t reference counter.
  579  */
  580 u_int32_t *uma_find_refcnt(uma_zone_t zone, void *item);
  581 
  582 /*
  583  * Used to determine if a fixed-size zone is exhausted.
  584  *
  585  * Arguments:
  586  *      zone    The zone to check
  587  *
  588  * Returns:
  589  *      Non-zero if zone is exhausted.
  590  */
  591 int uma_zone_exhausted(uma_zone_t zone);
  592 int uma_zone_exhausted_nolock(uma_zone_t zone);
  593 
  594 /*
  595  * Exported statistics structures to be used by user space monitoring tools.
  596  * Statistics stream consists of a uma_stream_header, followed by a series of
  597  * alternative uma_type_header and uma_type_stat structures.
  598  */
  599 #define UMA_STREAM_VERSION      0x00000001
  600 struct uma_stream_header {
  601         u_int32_t       ush_version;    /* Stream format version. */
  602         u_int32_t       ush_maxcpus;    /* Value of MAXCPU for stream. */
  603         u_int32_t       ush_count;      /* Number of records. */
  604         u_int32_t       _ush_pad;       /* Pad/reserved field. */
  605 };
  606 
  607 #define UTH_MAX_NAME    32
  608 #define UTH_ZONE_SECONDARY      0x00000001
  609 struct uma_type_header {
  610         /*
  611          * Static per-zone data, some extracted from the supporting keg.
  612          */
  613         char            uth_name[UTH_MAX_NAME];
  614         u_int32_t       uth_align;      /* Keg: alignment. */
  615         u_int32_t       uth_size;       /* Keg: requested size of item. */
  616         u_int32_t       uth_rsize;      /* Keg: real size of item. */
  617         u_int32_t       uth_maxpages;   /* Keg: maximum number of pages. */
  618         u_int32_t       uth_limit;      /* Keg: max items to allocate. */
  619 
  620         /*
  621          * Current dynamic zone/keg-derived statistics.
  622          */
  623         u_int32_t       uth_pages;      /* Keg: pages allocated. */
  624         u_int32_t       uth_keg_free;   /* Keg: items free. */
  625         u_int32_t       uth_zone_free;  /* Zone: items free. */
  626         u_int32_t       uth_bucketsize; /* Zone: desired bucket size. */
  627         u_int32_t       uth_zone_flags; /* Zone: flags. */
  628         u_int64_t       uth_allocs;     /* Zone: number of allocations. */
  629         u_int64_t       uth_frees;      /* Zone: number of frees. */
  630         u_int64_t       uth_fails;      /* Zone: number of alloc failures. */
  631         u_int64_t       uth_sleeps;     /* Zone: number of alloc sleeps. */
  632         u_int64_t       _uth_reserved1[2];      /* Reserved. */
  633 };
  634 
  635 struct uma_percpu_stat {
  636         u_int64_t       ups_allocs;     /* Cache: number of allocations. */
  637         u_int64_t       ups_frees;      /* Cache: number of frees. */
  638         u_int64_t       ups_cache_free; /* Cache: free items in cache. */
  639         u_int64_t       _ups_reserved[5];       /* Reserved. */
  640 };
  641 
  642 #endif

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