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
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
|
/*
* Copyright (c) 1999-2008 Mark D. Hill and David A. Wood
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* 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;
* neither the name of the copyright holders 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
* OWNER 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.
*/
#include "mem/gems_common/Map.hh"
#include "mem/ruby/common/Address.hh"
#include "mem/ruby/filters/MultiBitSelBloomFilter.hh"
using namespace std;
MultiBitSelBloomFilter::MultiBitSelBloomFilter(string str)
{
string tail(str);
string head = string_split(tail, '_');
// head contains filter size, tail contains bit offset from block number
m_filter_size = atoi(head.c_str());
head = string_split(tail, '_');
m_num_hashes = atoi(head.c_str());
head = string_split(tail, '_');
m_skip_bits = atoi(head.c_str());
if(tail == "Regular") {
isParallel = false;
} else if (tail == "Parallel") {
isParallel = true;
} else {
cout << "ERROR: Incorrect config string for MultiBitSel Bloom! :"
<< str << endl;
assert(0);
}
m_filter_size_bits = log_int(m_filter_size);
m_par_filter_size = m_filter_size/m_num_hashes;
m_par_filter_size_bits = log_int(m_par_filter_size);
m_filter.setSize(m_filter_size);
clear();
}
MultiBitSelBloomFilter::~MultiBitSelBloomFilter()
{
}
void
MultiBitSelBloomFilter::clear()
{
for (int i = 0; i < m_filter_size; i++) {
m_filter[i] = 0;
}
}
void
MultiBitSelBloomFilter::increment(const Address& addr)
{
// Not used
}
void
MultiBitSelBloomFilter::decrement(const Address& addr)
{
// Not used
}
void
MultiBitSelBloomFilter::merge(AbstractBloomFilter *other_filter)
{
// assumes both filters are the same size!
MultiBitSelBloomFilter * temp = (MultiBitSelBloomFilter*) other_filter;
for(int i = 0; i < m_filter_size; ++i){
m_filter[i] |= (*temp)[i];
}
}
void
MultiBitSelBloomFilter::set(const Address& addr)
{
for (int i = 0; i < m_num_hashes; i++) {
int idx = get_index(addr, i);
m_filter[idx] = 1;
}
}
void
MultiBitSelBloomFilter::unset(const Address& addr)
{
cout << "ERROR: Unset should never be called in a Bloom filter";
assert(0);
}
bool
MultiBitSelBloomFilter::isSet(const Address& addr)
{
bool res = true;
for (int i=0; i < m_num_hashes; i++) {
int idx = get_index(addr, i);
res = res && m_filter[idx];
}
return res;
}
int
MultiBitSelBloomFilter::getCount(const Address& addr)
{
return isSet(addr)? 1: 0;
}
int
MultiBitSelBloomFilter::getIndex(const Address& addr)
{
return 0;
}
int
MultiBitSelBloomFilter::readBit(const int index)
{
return 0;
}
void
MultiBitSelBloomFilter::writeBit(const int index, const int value)
{
}
int
MultiBitSelBloomFilter::getTotalCount()
{
int count = 0;
for (int i = 0; i < m_filter_size; i++) {
count += m_filter[i];
}
return count;
}
void
MultiBitSelBloomFilter::print(ostream& out) const
{
}
int
MultiBitSelBloomFilter::get_index(const Address& addr, int i)
{
// m_skip_bits is used to perform BitSelect after skipping some
// bits. Used to simulate BitSel hashing on larger than cache-line
// granularities
uint64 x = (addr.getLineAddress()) >> m_skip_bits;
int y = hash_bitsel(x, i, m_num_hashes, 30, m_filter_size_bits);
//36-bit addresses, 6-bit cache lines
if (isParallel) {
return (y % m_par_filter_size) + i*m_par_filter_size;
} else {
return y % m_filter_size;
}
}
int
MultiBitSelBloomFilter::hash_bitsel(uint64 value, int index, int jump,
int maxBits, int numBits)
{
uint64 mask = 1;
int result = 0;
int bit, i;
for (i = 0; i < numBits; i++) {
bit = (index + jump*i) % maxBits;
if (value & (mask << bit)) result += mask << i;
}
return result;
}
|