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
|
/* Test for memalign chunk reuse.
Copyright (C) 2022 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <malloc.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <array_length.h>
#include <libc-pointer-arith.h>
#include <support/check.h>
typedef struct TestCase {
size_t size;
size_t alignment;
void *ptr1;
void *ptr2;
} TestCase;
static TestCase tcache_allocs[] = {
{ 24, 32, NULL, NULL },
{ 24, 64, NULL, NULL },
{ 128, 128, NULL, NULL },
{ 500, 128, NULL, NULL }
};
#define TN array_length (tcache_allocs)
static TestCase large_allocs[] = {
{ 23450, 64, NULL, NULL },
{ 23450, 64, NULL, NULL },
{ 23550, 64, NULL, NULL },
{ 23550, 64, NULL, NULL },
{ 23650, 64, NULL, NULL },
{ 23650, 64, NULL, NULL },
{ 33650, 64, NULL, NULL },
{ 33650, 64, NULL, NULL }
};
#define LN array_length (large_allocs)
void *p;
/* Sanity checks, ancillary to the actual test. */
#define CHECK(p,a) \
if (p == NULL || !PTR_IS_ALIGNED (p, a)) \
FAIL_EXIT1 ("NULL or misaligned memory detected.\n");
static int
do_test (void)
{
int i, j;
int count;
void *ptr[10];
void *p;
/* TCache test. */
for (i = 0; i < TN; ++ i)
{
size_t sz2;
tcache_allocs[i].ptr1 = memalign (tcache_allocs[i].alignment, tcache_allocs[i].size);
CHECK (tcache_allocs[i].ptr1, tcache_allocs[i].alignment);
sz2 = malloc_usable_size (tcache_allocs[i].ptr1);
free (tcache_allocs[i].ptr1);
/* This should return the same chunk as was just free'd. */
tcache_allocs[i].ptr2 = memalign (tcache_allocs[i].alignment, sz2);
CHECK (tcache_allocs[i].ptr2, tcache_allocs[i].alignment);
free (tcache_allocs[i].ptr2);
TEST_VERIFY (tcache_allocs[i].ptr1 == tcache_allocs[i].ptr2);
}
/* Test for non-head tcache hits. This exercises the memalign
scanning code to find matching allocations. */
for (i = 0; i < array_length (ptr); ++ i)
{
if (i == 4)
{
ptr[i] = memalign (64, 256);
CHECK (ptr[i], 64);
}
else
{
ptr[i] = malloc (256);
CHECK (ptr[i], 4);
}
}
for (i = 0; i < array_length (ptr); ++ i)
free (ptr[i]);
p = memalign (64, 256);
CHECK (p, 64);
count = 0;
for (i = 0; i < 10; ++ i)
if (ptr[i] == p)
++ count;
free (p);
TEST_VERIFY (count > 0);
/* Large bins test. This verifies that the over-allocated parts
that memalign releases for future allocations can be reused by
memalign itself at least in some cases. */
for (i = 0; i < LN; ++ i)
{
large_allocs[i].ptr1 = memalign (large_allocs[i].alignment, large_allocs[i].size);
CHECK (large_allocs[i].ptr1, large_allocs[i].alignment);
/* Keep chunks from combining by fragmenting the heap. */
p = malloc (512);
CHECK (p, 4);
}
for (i = 0; i < LN; ++ i)
free (large_allocs[i].ptr1);
/* Force the unsorted bins to be scanned and moved to small/large
bins. */
p = malloc (60000);
for (i = 0; i < LN; ++ i)
{
large_allocs[i].ptr2 = memalign (large_allocs[i].alignment, large_allocs[i].size);
CHECK (large_allocs[i].ptr2, large_allocs[i].alignment);
}
count = 0;
for (i = 0; i < LN; ++ i)
{
int ok = 0;
for (j = 0; j < LN; ++ j)
if (large_allocs[i].ptr1 == large_allocs[j].ptr2)
ok = 1;
if (ok == 1)
count ++;
}
/* The allocation algorithm is complicated outside of the memalign
logic, so just make sure it's working for most of the
allocations. This avoids possible boundary conditions with
empty/full heaps. */
TEST_VERIFY (count > LN / 2);
return 0;
}
#include <support/test-driver.c>
|
