sys/vm/uma.h

   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  * $FreeBSD$
  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  * Import new memory into a cache zone.
 128  */
 129 typedef int (*uma_import)(void *arg, void **store, int count, int flags);
 130
 131 /*
 132  * Free memory from a cache zone.
 133  */
 134 typedef void (*uma_release)(void *arg, void **store, int count);
 135
 136 /*
 137  * What's the difference between initializing and constructing?
 138  *
 139  * The item is initialized when it is cached, and this is the state that the
 140  * object should be in when returned to the allocator. The purpose of this is
 141  * to remove some code which would otherwise be called on each allocation by
 142  * utilizing a known, stable state.  This differs from the constructor which
 143  * will be called on EVERY allocation.
 144  *
 145  * For example, in the initializer you may want to initialize embedded locks,
 146  * NULL list pointers, set up initial states, magic numbers, etc.  This way if
 147  * the object is held in the allocator and re-used it won't be necessary to
 148  * re-initialize it.
 149  *
 150  * The constructor may be used to lock a data structure, link it on to lists,
 151  * bump reference counts or total counts of outstanding structures, etc.
 152  *
 153  */
 154
 155
 156 /* Function proto types */
 157
 158 /*
 159  * Create a new uma zone
 160  *
 161  * Arguments:
 162  *      name  The text name of the zone for debugging and stats. This memory
 163  *              should not be freed until the zone has been deallocated.
 164  *      size  The size of the object that is being created.
 165  *      ctor  The constructor that is called when the object is allocated.
 166  *      dtor  The destructor that is called when the object is freed.
 167  *      init  An initializer that sets up the initial state of the memory.
 168  *      fini  A discard function that undoes initialization done by init.
 169  *              ctor/dtor/init/fini may all be null, see notes above.
 170  *      align A bitmask that corresponds to the requested alignment
 171  *              eg 4 would be 0x3
 172  *      flags A set of parameters that control the behavior of the zone.
 173  *
 174  * Returns:
 175  *      A pointer to a structure which is intended to be opaque to users of
 176  *      the interface.  The value may be null if the wait flag is not set.
 177  */
 178 uma_zone_t uma_zcreate(const char *name, size_t size, uma_ctor ctor,
 179                     uma_dtor dtor, uma_init uminit, uma_fini fini,
 180                     int align, uint32_t flags);
 181
 182 /*
 183  * Create a secondary uma zone
 184  *
 185  * Arguments:
 186  *      name  The text name of the zone for debugging and stats. This memory
 187  *              should not be freed until the zone has been deallocated.
 188  *      ctor  The constructor that is called when the object is allocated.
 189  *      dtor  The destructor that is called when the object is freed.
 190  *      zinit  An initializer that sets up the initial state of the memory
 191  *              as the object passes from the Keg's slab to the Zone's cache.
 192  *      zfini  A discard function that undoes initialization done by init
 193  *              as the object passes from the Zone's cache to the Keg's slab.
 194  *
 195  *              ctor/dtor/zinit/zfini may all be null, see notes above.
 196  *              Note that the zinit and zfini specified here are NOT
 197  *              exactly the same as the init/fini specified to uma_zcreate()
 198  *              when creating a master zone.  These zinit/zfini are called
 199  *              on the TRANSITION from keg to zone (and vice-versa). Once
 200  *              these are set, the primary zone may alter its init/fini
 201  *              (which are called when the object passes from VM to keg)
 202  *              using uma_zone_set_init/fini()) as well as its own
 203  *              zinit/zfini (unset by default for master zone) with
 204  *              uma_zone_set_zinit/zfini() (note subtle 'z' prefix).
 205  *
 206  *      master  A reference to this zone's Master Zone (Primary Zone),
 207  *              which contains the backing Keg for the Secondary Zone
 208  *              being added.
 209  *
 210  * Returns:
 211  *      A pointer to a structure which is intended to be opaque to users of
 212  *      the interface.  The value may be null if the wait flag is not set.
 213  */
 214 uma_zone_t uma_zsecond_create(char *name, uma_ctor ctor, uma_dtor dtor,
 215                     uma_init zinit, uma_fini zfini, uma_zone_t master);
 216
 217 /*
 218  * Add a second master to a secondary zone.  This provides multiple data
 219  * backends for objects with the same size.  Both masters must have
 220  * compatible allocation flags.  Presently, UMA_ZONE_MALLOC type zones are
 221  * the only supported.
 222  *
 223  * Returns:
 224  *      Error on failure, 0 on success.
 225  */
 226 int uma_zsecond_add(uma_zone_t zone, uma_zone_t master);
 227
 228 /*
 229  * Create cache-only zones.
 230  *
 231  * This allows uma's per-cpu cache facilities to handle arbitrary
 232  * pointers.  Consumers must specify the import and release functions to
 233  * fill and destroy caches.  UMA does not allocate any memory for these
 234  * zones.  The 'arg' parameter is passed to import/release and is caller
 235  * specific.
 236  */
 237 uma_zone_t uma_zcache_create(char *name, int size, uma_ctor ctor, uma_dtor dtor,
 238                     uma_init zinit, uma_fini zfini, uma_import zimport,
 239                     uma_release zrelease, void *arg, int flags);
 240
 241 /*
 242  * Definitions for uma_zcreate flags
 243  *
 244  * These flags share space with UMA_ZFLAGs in uma_int.h.  Be careful not to
 245  * overlap when adding new features.  0xf0000000 is in use by uma_int.h.
 246  */
 247 #define UMA_ZONE_PAGEABLE       0x0001  /* Return items not fully backed by
 248                                            physical memory XXX Not yet */
 249 #define UMA_ZONE_ZINIT          0x0002  /* Initialize with zeros */
 250 #define UMA_ZONE_STATIC         0x0004  /* Statically sized zone */
 251 #define UMA_ZONE_OFFPAGE        0x0008  /* Force the slab structure allocation
 252                                            off of the real memory */
 253 #define UMA_ZONE_MALLOC         0x0010  /* For use by malloc(9) only! */
 254 #define UMA_ZONE_NOFREE         0x0020  /* Do not free slabs of this type! */
 255 #define UMA_ZONE_MTXCLASS       0x0040  /* Create a new lock class */
 256 #define UMA_ZONE_VM             0x0080  /*
 257                                          * Used for internal vm datastructures
 258                                          * only.
 259                                          */
 260 #define UMA_ZONE_HASH           0x0100  /*
 261                                          * Use a hash table instead of caching
 262                                          * information in the vm_page.
 263                                          */
 264 #define UMA_ZONE_SECONDARY      0x0200  /* Zone is a Secondary Zone */
 265 /*                              0x0400     Unused */
 266 #define UMA_ZONE_MAXBUCKET      0x0800  /* Use largest buckets */
 267 #define UMA_ZONE_CACHESPREAD    0x1000  /*
 268                                          * Spread memory start locations across
 269                                          * all possible cache lines.  May
 270                                          * require many virtually contiguous
 271                                          * backend pages and can fail early.
 272                                          */
 273 #define UMA_ZONE_VTOSLAB        0x2000  /* Zone uses vtoslab for lookup. */
 274 #define UMA_ZONE_NODUMP         0x4000  /*
 275                                          * Zone's pages will not be included in
 276                                          * mini-dumps.
 277                                          */
 278 #define UMA_ZONE_PCPU           0x8000  /*
 279                                          * Allocates mp_maxid + 1 slabs sized to
 280                                          * sizeof(struct pcpu).
 281                                          */
 282
 283 /*
 284  * These flags are shared between the keg and zone.  In zones wishing to add
 285  * new kegs these flags must be compatible.  Some are determined based on
 286  * physical parameters of the request and may not be provided by the consumer.
 287  */
 288 #define UMA_ZONE_INHERIT                                                \
 289     (UMA_ZONE_OFFPAGE | UMA_ZONE_MALLOC | UMA_ZONE_NOFREE |             \
 290     UMA_ZONE_HASH | UMA_ZONE_VTOSLAB | UMA_ZONE_PCPU)
 291
 292 /* Definitions for align */
 293 #define UMA_ALIGN_PTR   (sizeof(void *) - 1)    /* Alignment fit for ptr */
 294 #define UMA_ALIGN_LONG  (sizeof(long) - 1)      /* "" long */
 295 #define UMA_ALIGN_INT   (sizeof(int) - 1)       /* "" int */
 296 #define UMA_ALIGN_SHORT (sizeof(short) - 1)     /* "" short */
 297 #define UMA_ALIGN_CHAR  (sizeof(char) - 1)      /* "" char */
 298 #define UMA_ALIGN_CACHE (0 - 1)                 /* Cache line size align */
 299
 300 /*
 301  * Destroys an empty uma zone.  If the zone is not empty uma complains loudly.
 302  *
 303  * Arguments:
 304  *      zone  The zone we want to destroy.
 305  *
 306  */
 307 void uma_zdestroy(uma_zone_t zone);
 308
 309 /*
 310  * Allocates an item out of a zone
 311  *
 312  * Arguments:
 313  *      zone  The zone we are allocating from
 314  *      arg   This data is passed to the ctor function
 315  *      flags See sys/malloc.h for available flags.
 316  *
 317  * Returns:
 318  *      A non-null pointer to an initialized element from the zone is
 319  *      guaranteed if the wait flag is M_WAITOK.  Otherwise a null pointer
 320  *      may be returned if the zone is empty or the ctor failed.
 321  */
 322
 323 void *uma_zalloc_arg(uma_zone_t zone, void *arg, int flags);
 324
 325 /*
 326  * Allocates an item out of a zone without supplying an argument
 327  *
 328  * This is just a wrapper for uma_zalloc_arg for convenience.
 329  *
 330  */
 331 static __inline void *uma_zalloc(uma_zone_t zone, int flags);
 332
 333 static __inline void *
 334 uma_zalloc(uma_zone_t zone, int flags)
 335 {
 336         return uma_zalloc_arg(zone, NULL, flags);
 337 }
 338
 339 /*
 340  * Frees an item back into the specified zone.
 341  *
 342  * Arguments:
 343  *      zone  The zone the item was originally allocated out of.
 344  *      item  The memory to be freed.
 345  *      arg   Argument passed to the destructor
 346  *
 347  * Returns:
 348  *      Nothing.
 349  */
 350
 351 void uma_zfree_arg(uma_zone_t zone, void *item, void *arg);
 352
 353 /*
 354  * Frees an item back to a zone without supplying an argument
 355  *
 356  * This is just a wrapper for uma_zfree_arg for convenience.
 357  *
 358  */
 359 static __inline void uma_zfree(uma_zone_t zone, void *item);
 360
 361 static __inline void
 362 uma_zfree(uma_zone_t zone, void *item)
 363 {
 364         uma_zfree_arg(zone, item, NULL);
 365 }
 366
 367 /*
 368  * XXX The rest of the prototypes in this header are h0h0 magic for the VM.
 369  * If you think you need to use it for a normal zone you're probably incorrect.
 370  */
 371
 372 /*
 373  * Backend page supplier routines
 374  *
 375  * Arguments:
 376  *      zone  The zone that is requesting pages.
 377  *      size  The number of bytes being requested.
 378  *      pflag Flags for these memory pages, see below.
 379  *      wait  Indicates our willingness to block.
 380  *
 381  * Returns:
 382  *      A pointer to the allocated memory or NULL on failure.
 383  */
 384
 385 typedef void *(*uma_alloc)(uma_zone_t zone, vm_size_t size, uint8_t *pflag,
 386     int wait);
 387
 388 /*
 389  * Backend page free routines
 390  *
 391  * Arguments:
 392  *      item  A pointer to the previously allocated pages.
 393  *      size  The original size of the allocation.
 394  *      pflag The flags for the slab.  See UMA_SLAB_* below.
 395  *
 396  * Returns:
 397  *      None
 398  */
 399 typedef void (*uma_free)(void *item, vm_size_t size, uint8_t pflag);
 400
 401
 402
 403 /*
 404  * Sets up the uma allocator. (Called by vm_mem_init)
 405  *
 406  * Arguments:
 407  *      bootmem  A pointer to memory used to bootstrap the system.
 408  *
 409  * Returns:
 410  *      Nothing
 411  *
 412  * Discussion:
 413  *      This memory is used for zones which allocate things before the
 414  *      backend page supplier can give us pages.  It should be
 415  *      UMA_SLAB_SIZE * boot_pages bytes. (see uma_int.h)
 416  *
 417  */
 418
 419 void uma_startup(void *bootmem, int boot_pages);
 420
 421 /*
 422  * Finishes starting up the allocator.  This should
 423  * be called when kva is ready for normal allocs.
 424  *
 425  * Arguments:
 426  *      None
 427  *
 428  * Returns:
 429  *      Nothing
 430  *
 431  * Discussion:
 432  *      uma_startup2 is called by kmeminit() to enable us of uma for malloc.
 433  */
 434
 435 void uma_startup2(void);
 436
 437 /*
 438  * Reclaims unused memory for all zones
 439  *
 440  * Arguments:
 441  *      None
 442  * Returns:
 443  *      None
 444  *
 445  * This should only be called by the page out daemon.
 446  */
 447
 448 void uma_reclaim(void);
 449
 450 /*
 451  * Sets the alignment mask to be used for all zones requesting cache
 452  * alignment.  Should be called by MD boot code prior to starting VM/UMA.
 453  *
 454  * Arguments:
 455  *      align The alignment mask
 456  *
 457  * Returns:
 458  *      Nothing
 459  */
 460 void uma_set_align(int align);
 461
 462 /*
 463  * Set a reserved number of items to hold for M_USE_RESERVE allocations.  All
 464  * other requests must allocate new backing pages.
 465  */
 466 void uma_zone_reserve(uma_zone_t zone, int nitems);
 467
 468 /*
 469  * Reserves the maximum KVA space required by the zone and configures the zone
 470  * to use a VM_ALLOC_NOOBJ-based backend allocator.
 471  *
 472  * Arguments:
 473  *      zone  The zone to update.
 474  *      nitems  The upper limit on the number of items that can be allocated.
 475  *
 476  * Returns:
 477  *      0  if KVA space can not be allocated
 478  *      1  if successful
 479  *
 480  * Discussion:
 481  *      When the machine supports a direct map and the zone's items are smaller
 482  *      than a page, the zone will use the direct map instead of allocating KVA
 483  *      space.
 484  */
 485 int uma_zone_reserve_kva(uma_zone_t zone, int nitems);
 486
 487 /*
 488  * Sets a high limit on the number of items allowed in a zone
 489  *
 490  * Arguments:
 491  *      zone  The zone to limit
 492  *      nitems  The requested upper limit on the number of items allowed
 493  *
 494  * Returns:
 495  *      int  The effective value of nitems after rounding up based on page size
 496  */
 497 int uma_zone_set_max(uma_zone_t zone, int nitems);
 498
 499 /*
 500  * Obtains the effective limit on the number of items in a zone
 501  *
 502  * Arguments:
 503  *      zone  The zone to obtain the effective limit from
 504  *
 505  * Return:
 506  *      0  No limit
 507  *      int  The effective limit of the zone
 508  */
 509 int uma_zone_get_max(uma_zone_t zone);
 510
 511 /*
 512  * Sets a warning to be printed when limit is reached
 513  *
 514  * Arguments:
 515  *      zone  The zone we will warn about
 516  *      warning  Warning content
 517  *
 518  * Returns:
 519  *      Nothing
 520  */
 521 void uma_zone_set_warning(uma_zone_t zone, const char *warning);
 522
 523 /*
 524  * Sets a function to run when limit is reached
 525  *
 526  * Arguments:
 527  *      zone  The zone to which this applies
 528  *      fx  The function ro run
 529  *
 530  * Returns:
 531  *      Nothing
 532  */
 533 typedef void (*uma_maxaction_t)(uma_zone_t, int);
 534 void uma_zone_set_maxaction(uma_zone_t zone, uma_maxaction_t);
 535
 536 /*
 537  * Obtains the approximate current number of items allocated from a zone
 538  *
 539  * Arguments:
 540  *      zone  The zone to obtain the current allocation count from
 541  *
 542  * Return:
 543  *      int  The approximate current number of items allocated from the zone
 544  */
 545 int uma_zone_get_cur(uma_zone_t zone);
 546
 547 /*
 548  * The following two routines (uma_zone_set_init/fini)
 549  * are used to set the backend init/fini pair which acts on an
 550  * object as it becomes allocated and is placed in a slab within
 551  * the specified zone's backing keg.  These should probably not
 552  * be changed once allocations have already begun, but only be set
 553  * immediately upon zone creation.
 554  */
 555 void uma_zone_set_init(uma_zone_t zone, uma_init uminit);
 556 void uma_zone_set_fini(uma_zone_t zone, uma_fini fini);
 557
 558 /*
 559  * The following two routines (uma_zone_set_zinit/zfini) are
 560  * used to set the zinit/zfini pair which acts on an object as
 561  * it passes from the backing Keg's slab cache to the
 562  * specified Zone's bucket cache.  These should probably not
 563  * be changed once allocations have already begun, but only be set
 564  * immediately upon zone creation.
 565  */
 566 void uma_zone_set_zinit(uma_zone_t zone, uma_init zinit);
 567 void uma_zone_set_zfini(uma_zone_t zone, uma_fini zfini);
 568
 569 /*
 570  * Replaces the standard backend allocator for this zone.
 571  *
 572  * Arguments:
 573  *      zone   The zone whose backend allocator is being changed.
 574  *      allocf A pointer to the allocation function
 575  *
 576  * Returns:
 577  *      Nothing
 578  *
 579  * Discussion:
 580  *      This could be used to implement pageable allocation, or perhaps
 581  *      even DMA allocators if used in conjunction with the OFFPAGE
 582  *      zone flag.
 583  */
 584
 585 void uma_zone_set_allocf(uma_zone_t zone, uma_alloc allocf);
 586
 587 /*
 588  * Used for freeing memory provided by the allocf above
 589  *
 590  * Arguments:
 591  *      zone  The zone that intends to use this free routine.
 592  *      freef The page freeing routine.
 593  *
 594  * Returns:
 595  *      Nothing
 596  */
 597
 598 void uma_zone_set_freef(uma_zone_t zone, uma_free freef);
 599
 600 /*
 601  * These flags are setable in the allocf and visible in the freef.
 602  */
 603 #define UMA_SLAB_BOOT   0x01            /* Slab alloced from boot pages */
 604 #define UMA_SLAB_KMEM   0x02            /* Slab alloced from kmem_map */
 605 #define UMA_SLAB_KERNEL 0x04            /* Slab alloced from kernel_map */
 606 #define UMA_SLAB_PRIV   0x08            /* Slab alloced from priv allocator */
 607 #define UMA_SLAB_OFFP   0x10            /* Slab is managed separately  */
 608 #define UMA_SLAB_MALLOC 0x20            /* Slab is a large malloc slab */
 609 /* 0x40 and 0x80 are available */
 610
 611 /*
 612  * Used to pre-fill a zone with some number of items
 613  *
 614  * Arguments:
 615  *      zone    The zone to fill
 616  *      itemcnt The number of items to reserve
 617  *
 618  * Returns:
 619  *      Nothing
 620  *
 621  * NOTE: This is blocking and should only be done at startup
 622  */
 623 void uma_prealloc(uma_zone_t zone, int itemcnt);
 624
 625 /*
 626  * Used to determine if a fixed-size zone is exhausted.
 627  *
 628  * Arguments:
 629  *      zone    The zone to check
 630  *
 631  * Returns:
 632  *      Non-zero if zone is exhausted.
 633  */
 634 int uma_zone_exhausted(uma_zone_t zone);
 635 int uma_zone_exhausted_nolock(uma_zone_t zone);
 636
 637 /*
 638  * Common UMA_ZONE_PCPU zones.
 639  */
 640 extern uma_zone_t pcpu_zone_64;
 641 extern uma_zone_t pcpu_zone_ptr;
 642
 643 /*
 644  * Exported statistics structures to be used by user space monitoring tools.
 645  * Statistics stream consists of a uma_stream_header, followed by a series of
 646  * alternative uma_type_header and uma_type_stat structures.
 647  */
 648 #define UMA_STREAM_VERSION      0x00000001
 649 struct uma_stream_header {
 650         uint32_t        ush_version;    /* Stream format version. */
 651         uint32_t        ush_maxcpus;    /* Value of MAXCPU for stream. */
 652         uint32_t        ush_count;      /* Number of records. */
 653         uint32_t        _ush_pad;       /* Pad/reserved field. */
 654 };
 655
 656 #define UTH_MAX_NAME    32
 657 #define UTH_ZONE_SECONDARY      0x00000001
 658 struct uma_type_header {
 659         /*
 660          * Static per-zone data, some extracted from the supporting keg.
 661          */
 662         char            uth_name[UTH_MAX_NAME];
 663         uint32_t        uth_align;      /* Keg: alignment. */
 664         uint32_t        uth_size;       /* Keg: requested size of item. */
 665         uint32_t        uth_rsize;      /* Keg: real size of item. */
 666         uint32_t        uth_maxpages;   /* Keg: maximum number of pages. */
 667         uint32_t        uth_limit;      /* Keg: max items to allocate. */
 668
 669         /*
 670          * Current dynamic zone/keg-derived statistics.
 671          */
 672         uint32_t        uth_pages;      /* Keg: pages allocated. */
 673         uint32_t        uth_keg_free;   /* Keg: items free. */
 674         uint32_t        uth_zone_free;  /* Zone: items free. */
 675         uint32_t        uth_bucketsize; /* Zone: desired bucket size. */
 676         uint32_t        uth_zone_flags; /* Zone: flags. */
 677         uint64_t        uth_allocs;     /* Zone: number of allocations. */
 678         uint64_t        uth_frees;      /* Zone: number of frees. */
 679         uint64_t        uth_fails;      /* Zone: number of alloc failures. */
 680         uint64_t        uth_sleeps;     /* Zone: number of alloc sleeps. */
 681         uint64_t        _uth_reserved1[2];      /* Reserved. */
 682 };
 683
 684 struct uma_percpu_stat {
 685         uint64_t        ups_allocs;     /* Cache: number of allocations. */
 686         uint64_t        ups_frees;      /* Cache: number of frees. */
 687         uint64_t        ups_cache_free; /* Cache: free items in cache. */
 688         uint64_t        _ups_reserved[5];       /* Reserved. */
 689 };
 690
 691 void uma_reclaim_wakeup(void);
 692 void uma_reclaim_worker(void *);
 693
 694 #endif  /* _VM_UMA_H_ */