4045 zfs write throttle & i/o scheduler performance work
Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Adam Leventhal <ahl@delphix.com>
Reviewed by: Christopher Siden <christopher.siden@delphix.com>

          --- old/usr/src/uts/common/fs/zfs/sys/arc.h
          +++ new/usr/src/uts/common/fs/zfs/sys/arc.h

   1    1  /*
   2    2   * CDDL HEADER START
   3    3   *
   4    4   * The contents of this file are subject to the terms of the
   5    5   * Common Development and Distribution License (the "License").
   6    6   * You may not use this file except in compliance with the License.
   7    7   *
   8    8   * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9    9   * or http://www.opensolaris.org/os/licensing.
  10   10   * See the License for the specific language governing permissions
  11   11   * and limitations under the License.
  12   12   *
  13   13   * When distributing Covered Code, include this CDDL HEADER in each
  14   14   * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15   15   * If applicable, add the following below this CDDL HEADER, with the
  16   16   * fields enclosed by brackets "[]" replaced with your own identifying
  17   17   * information: Portions Copyright [yyyy] [name of copyright owner]
  18   18   *
  19   19   * CDDL HEADER END
  20   20   */
  21   21  /*
  22   22   * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
  23   23   * Copyright (c) 2013 by Delphix. All rights reserved.
  24   24   * Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
  25   25   */
  26   26  
  27   27  #ifndef _SYS_ARC_H
  28   28  #define _SYS_ARC_H
  29   29  
  30   30  #include <sys/zfs_context.h>
  31   31  
  32   32  #ifdef  __cplusplus
  33   33  extern "C" {
  34   34  #endif
  35   35  
  36   36  #include <sys/zio.h>
  37   37  #include <sys/dmu.h>
  38   38  #include <sys/spa.h>
  39   39  
  40   40  typedef struct arc_buf_hdr arc_buf_hdr_t;
  41   41  typedef struct arc_buf arc_buf_t;
  42   42  typedef void arc_done_func_t(zio_t *zio, arc_buf_t *buf, void *private);
  43   43  typedef int arc_evict_func_t(void *private);
  44   44  
  45   45  /* generic arc_done_func_t's which you can use */
  46   46  arc_done_func_t arc_bcopy_func;
  47   47  arc_done_func_t arc_getbuf_func;
  48   48  
  49   49  struct arc_buf {
  50   50          arc_buf_hdr_t           *b_hdr;
  51   51          arc_buf_t               *b_next;
  52   52          kmutex_t                b_evict_lock;
  53   53          void                    *b_data;
  54   54          arc_evict_func_t        *b_efunc;
  55   55          void                    *b_private;
  56   56  };
  57   57  
  58   58  typedef enum arc_buf_contents {
  59   59          ARC_BUFC_DATA,                          /* buffer contains data */
  60   60          ARC_BUFC_METADATA,                      /* buffer contains metadata */
  61   61          ARC_BUFC_NUMTYPES
  62   62  } arc_buf_contents_t;
  63   63  /*
  64   64   * These are the flags we pass into calls to the arc
  65   65   */
  66   66  #define ARC_WAIT        (1 << 1)        /* perform I/O synchronously */
  67   67  #define ARC_NOWAIT      (1 << 2)        /* perform I/O asynchronously */
  68   68  #define ARC_PREFETCH    (1 << 3)        /* I/O is a prefetch */
  69   69  #define ARC_CACHED      (1 << 4)        /* I/O was already in cache */
  70   70  #define ARC_L2CACHE     (1 << 5)        /* cache in L2ARC */
  71   71  #define ARC_L2COMPRESS  (1 << 6)        /* compress in L2ARC */
  72   72  
  73   73  /*
  74   74   * The following breakdows of arc_size exist for kstat only.
  75   75   */
  76   76  typedef enum arc_space_type {
  77   77          ARC_SPACE_DATA,
  78   78          ARC_SPACE_HDRS,
  79   79          ARC_SPACE_L2HDRS,
  80   80          ARC_SPACE_OTHER,
  81   81          ARC_SPACE_NUMTYPES
  82   82  } arc_space_type_t;
  83   83  
  84   84  void arc_space_consume(uint64_t space, arc_space_type_t type);
  85   85  void arc_space_return(uint64_t space, arc_space_type_t type);
  86   86  void *arc_data_buf_alloc(uint64_t space);
  87   87  void arc_data_buf_free(void *buf, uint64_t space);
  88   88  arc_buf_t *arc_buf_alloc(spa_t *spa, int size, void *tag,
  89   89      arc_buf_contents_t type);
  90   90  arc_buf_t *arc_loan_buf(spa_t *spa, int size);
  91   91  void arc_return_buf(arc_buf_t *buf, void *tag);
  92   92  void arc_loan_inuse_buf(arc_buf_t *buf, void *tag);
  93   93  void arc_buf_add_ref(arc_buf_t *buf, void *tag);
  94   94  boolean_t arc_buf_remove_ref(arc_buf_t *buf, void *tag);
  95   95  int arc_buf_size(arc_buf_t *buf);
  96   96  void arc_release(arc_buf_t *buf, void *tag);

  97   97  int arc_released(arc_buf_t *buf);
  98   98  int arc_has_callback(arc_buf_t *buf);
  99   99  void arc_buf_freeze(arc_buf_t *buf);
 100  100  void arc_buf_thaw(arc_buf_t *buf);
 101  101  boolean_t arc_buf_eviction_needed(arc_buf_t *buf);
 102  102  #ifdef ZFS_DEBUG
 103  103  int arc_referenced(arc_buf_t *buf);
 104  104  #endif
 105  105  
 106  106  int arc_read(zio_t *pio, spa_t *spa, const blkptr_t *bp,
 107      -    arc_done_func_t *done, void *private, int priority, int flags,
      107 +    arc_done_func_t *done, void *private, zio_priority_t priority, int flags,
 108  108      uint32_t *arc_flags, const zbookmark_t *zb);
 109  109  zio_t *arc_write(zio_t *pio, spa_t *spa, uint64_t txg,
 110  110      blkptr_t *bp, arc_buf_t *buf, boolean_t l2arc, boolean_t l2arc_compress,
 111      -    const zio_prop_t *zp, arc_done_func_t *ready, arc_done_func_t *done,
 112      -    void *private, int priority, int zio_flags, const zbookmark_t *zb);
      111 +    const zio_prop_t *zp, arc_done_func_t *ready, arc_done_func_t *physdone,
      112 +    arc_done_func_t *done, void *private, zio_priority_t priority,
      113 +    int zio_flags, const zbookmark_t *zb);
 113  114  void arc_freed(spa_t *spa, const blkptr_t *bp);
 114  115  
 115  116  void arc_set_callback(arc_buf_t *buf, arc_evict_func_t *func, void *private);
 116  117  int arc_buf_evict(arc_buf_t *buf);
 117  118  
 118  119  void arc_flush(spa_t *spa);
 119  120  void arc_tempreserve_clear(uint64_t reserve);
 120  121  int arc_tempreserve_space(uint64_t reserve, uint64_t txg);
 121  122  
 122  123  void arc_init(void);

 123  124  void arc_fini(void);
 124  125  
 125  126  /*
 126  127   * Level 2 ARC
 127  128   */
 128  129  
 129  130  void l2arc_add_vdev(spa_t *spa, vdev_t *vd);
 130  131  void l2arc_remove_vdev(vdev_t *vd);
 131  132  boolean_t l2arc_vdev_present(vdev_t *vd);
 132  133  void l2arc_init(void);
 133  134  void l2arc_fini(void);
 134  135  void l2arc_start(void);
 135  136  void l2arc_stop(void);
 136  137  
 137  138  #ifndef _KERNEL
 138  139  extern boolean_t arc_watch;
 139  140  extern int arc_procfd;
 140  141  #endif
 141  142  
 142  143  #ifdef  __cplusplus
 143  144  }
 144  145  #endif
 145  146  
 146  147  #endif /* _SYS_ARC_H */

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