1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
|
// SPDX-License-Identifier: CDDL-1.0
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or https://opensource.org/licenses/CDDL-1.0.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2018, Joyent, Inc.
* Copyright (c) 2011, 2019 by Delphix. All rights reserved.
* Copyright (c) 2014 by Saso Kiselkov. All rights reserved.
* Copyright 2017 Nexenta Systems, Inc. All rights reserved.
*/
#include <sys/zfs_context.h>
#include <sys/arc_impl.h>
/*
* Return a default max arc size based on the amount of physical memory.
* This may be overridden by tuning the zfs_arc_max module parameter.
*/
uint64_t
arc_default_max(uint64_t min, uint64_t allmem)
{
uint64_t size;
if (allmem >= 1 << 30)
size = allmem - (1 << 30);
else
size = min;
return (MAX(allmem * 5 / 8, size));
}
int64_t
arc_available_memory(void)
{
int64_t lowest = INT64_MAX;
/* Every 100 calls, free a small amount */
if (random_in_range(100) == 0)
lowest = -1024;
return (lowest);
}
int
arc_memory_throttle(spa_t *spa, uint64_t reserve, uint64_t txg)
{
(void) spa, (void) reserve, (void) txg;
return (0);
}
uint64_t
arc_all_memory(void)
{
return (ptob(physmem) / 2);
}
uint64_t
arc_free_memory(void)
{
return (random_in_range(arc_all_memory() * 20 / 100));
}
void
arc_register_hotplug(void)
{
}
void
arc_unregister_hotplug(void)
{
}
|
