usr/src/uts/common/fs/zfs/sys/aggsum.h

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * This file and its contents are supplied under the terms of the
   5  * Common Development and Distribution License ("CDDL"), version 1.0.
   6  * You may only use this file in accordance with the terms of version
   7  * 1.0 of the CDDL.
   8  *
   9  * A full copy of the text of the CDDL should have accompanied this
  10  * source.  A copy of the CDDL is also available via the Internet at
  11  * http://www.illumos.org/license/CDDL.
  12  *
  13  * CDDL HEADER END
  14  */
  15 /*
  16  * Copyright (c) 2017 by Delphix. All rights reserved.
  17  */
  18
  19 #ifndef _SYS_AGGSUM_H
  20 #define _SYS_AGGSUM_H
  21
  22 #include <sys/zfs_context.h>
  23
  24 #ifdef  __cplusplus
  25 extern "C" {
  26 #endif
  27
  28 #define CACHE_LINE_SIZE 64
  29
  30 typedef struct aggsum_bucket {
  31         kmutex_t asc_lock;
  32         int64_t asc_delta;
  33         uint64_t asc_borrowed;
  34         uint64_t asc_pad[4]; /* pad out to cache line (64 bytes) */
  35 } aggsum_bucket_t __aligned(CACHE_LINE_SIZE);
  36
  37 /*
  38  * Fan out over FANOUT cpus.
  39  */
  40 typedef struct aggsum {
  41         kmutex_t as_lock;
  42         int64_t as_lower_bound;
  43         int64_t as_upper_bound;
  44         uint64_t as_numbuckets;
  45         aggsum_bucket_t *as_buckets;
  46 } aggsum_t;
  47
  48 void aggsum_init(aggsum_t *, uint64_t);
  49 void aggsum_fini(aggsum_t *);
  50 int64_t aggsum_lower_bound(aggsum_t *);
  51 int64_t aggsum_upper_bound(aggsum_t *);
  52 int aggsum_compare(aggsum_t *, uint64_t);
  53 uint64_t aggsum_value(aggsum_t *);
  54 void aggsum_add(aggsum_t *, int64_t);
  55
  56 #ifdef  __cplusplus
  57 }
  58 #endif
  59
  60 #endif /* _SYS_AGGSUM_H */