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88 lines
2.0 KiB
C
88 lines
2.0 KiB
C
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/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or https://opensource.org/licenses/CDDL-1.0.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2018, Joyent, Inc.
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* Copyright (c) 2011, 2019 by Delphix. All rights reserved.
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* Copyright (c) 2014 by Saso Kiselkov. All rights reserved.
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* Copyright 2017 Nexenta Systems, Inc. All rights reserved.
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*/
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#include <sys/zfs_context.h>
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#include <sys/arc_impl.h>
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/*
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* Return a default max arc size based on the amount of physical memory.
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* This may be overridden by tuning the zfs_arc_max module parameter.
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*/
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uint64_t
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arc_default_max(uint64_t min, uint64_t allmem)
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{
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uint64_t size;
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if (allmem >= 1 << 30)
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size = allmem - (1 << 30);
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else
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size = min;
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return (MAX(allmem * 5 / 8, size));
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}
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int64_t
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arc_available_memory(void)
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{
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int64_t lowest = INT64_MAX;
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/* Every 100 calls, free a small amount */
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if (random_in_range(100) == 0)
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lowest = -1024;
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return (lowest);
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}
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int
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arc_memory_throttle(spa_t *spa, uint64_t reserve, uint64_t txg)
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{
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(void) spa, (void) reserve, (void) txg;
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return (0);
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}
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uint64_t
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arc_all_memory(void)
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{
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return (ptob(physmem) / 2);
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}
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uint64_t
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arc_free_memory(void)
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{
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return (random_in_range(arc_all_memory() * 20 / 100));
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}
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void
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arc_register_hotplug(void)
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{
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}
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void
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arc_unregister_hotplug(void)
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{
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}
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