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
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
|
/*
* Copyright (c) 2013-2015 Advanced Micro Devices, Inc.
* All rights reserved.
*
* For use for simulation and test purposes only
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* Authors: Sooraj Puthoor
*/
#ifndef __MEM_RUBY_SYSTEM_WEIGHTEDLRUPOLICY_HH__
#define __MEM_RUBY_SYSTEM_WEIGHTEDLRUPOLICY_HH__
#include "mem/cache/replacement_policies/base.hh"
#include "mem/ruby/structures/CacheMemory.hh"
#include "params/WeightedLRUReplacementPolicy.hh"
/* Simple true LRU replacement policy */
class WeightedLRUPolicy : public BaseReplacementPolicy
{
protected:
/** Weighted LRU implementation of replacement data. */
struct WeightedLRUReplData : ReplacementData
{
/** pointer for last occupancy */
int last_occ_ptr;
/** Tick on which the entry was last touched. */
Tick last_touch_tick;
/**
* Default constructor. Invalidate data.
*/
WeightedLRUReplData() : ReplacementData(),
last_occ_ptr(0), last_touch_tick(0) {}
};
public:
typedef WeightedLRUReplacementPolicyParams Params;
WeightedLRUPolicy(const Params* p);
~WeightedLRUPolicy() {}
/**
* Invalidate replacement data to set it as the next probable victim.
* Sets its last touch tick as the starting tick.
*
* @param replacement_data Replacement data to be invalidated.
*/
void invalidate(const std::shared_ptr<ReplacementData>& replacement_data)
const override;
/**
* Touch an entry to update its replacement data.
* Sets its last touch tick as the current tick.
*
* @param replacement_data Replacement data to be touched.
*/
void touch(const std::shared_ptr<ReplacementData>&
replacement_data) const override;
void touch(const std::shared_ptr<ReplacementData>& replacement_data,
int occupancy) const;
/**
* Reset replacement data. Used when an entry is inserted.
* Sets its last touch tick as the current tick.
*
* @param replacement_data Replacement data to be reset.
*/
void reset(const std::shared_ptr<ReplacementData>& replacement_data) const
override;
/**
* Instantiate a replacement data entry.
*
* @return A shared pointer to the new replacement data.
*/
std::shared_ptr<ReplacementData> instantiateEntry() override;
/**
* Find replacement victim using weight.
*
* @param candidates Replacement candidates, selected by indexing policy.
* @return Replacement entry to be replaced.
*/
ReplaceableEntry* getVictim(const ReplacementCandidates&
candidates) const override;
};
#endif // __MEM_RUBY_SYSTEM_WeightedLRUPolicy_HH__
|
