| 1 | /* test-slub.c |
| 2 | * |
| 3 | * Compare local cmpxchg with irq disable / enable with cmpxchg_local for slub. |
| 4 | */ |
| 5 | |
| 6 | |
| 7 | #include <linux/jiffies.h> |
| 8 | #include <linux/compiler.h> |
| 9 | #include <linux/init.h> |
| 10 | #include <linux/module.h> |
| 11 | #include <linux/calc64.h> |
| 12 | #include <asm/timex.h> |
| 13 | #include <asm/system.h> |
| 14 | |
| 15 | #define TEST_COUNT 10000 |
| 16 | |
| 17 | extern atomic_t slub_fast_count; |
| 18 | extern atomic_t slub_slow_count; |
| 19 | |
| 20 | static int slub_test_init(void) |
| 21 | { |
| 22 | void **v = kmalloc(TEST_COUNT * sizeof(void *), GFP_KERNEL); |
| 23 | unsigned int i; |
| 24 | cycles_t time1, time2, time; |
| 25 | long rem; |
| 26 | int size; |
| 27 | |
| 28 | printk(KERN_ALERT "test init\n"); |
| 29 | |
| 30 | printk("Fast slub free: %u\n", atomic_read(&slub_fast_count)); |
| 31 | printk("Slow slub free: %u\n", atomic_read(&slub_slow_count)); |
| 32 | printk(KERN_ALERT "SLUB Performance testing\n"); |
| 33 | printk(KERN_ALERT "========================\n"); |
| 34 | printk(KERN_ALERT "1. Kmalloc: Repeatedly allocate then free test\n"); |
| 35 | for (size = 8; size <= PAGE_SIZE << 2; size <<= 1) { |
| 36 | time1 = get_cycles(); |
| 37 | for (i = 0; i < TEST_COUNT; i++) { |
| 38 | v[i] = kmalloc(size, GFP_KERNEL); |
| 39 | } |
| 40 | time2 = get_cycles(); |
| 41 | time = time2 - time1; |
| 42 | |
| 43 | printk(KERN_ALERT "%i times kmalloc(%d) = \n", i, size); |
| 44 | printk(KERN_ALERT "number of loops: %d\n", TEST_COUNT); |
| 45 | printk(KERN_ALERT "total time: %llu\n", time); |
| 46 | time = div_long_long_rem(time, TEST_COUNT, &rem); |
| 47 | printk(KERN_ALERT "-> %llu cycles\n", time); |
| 48 | |
| 49 | time1 = get_cycles(); |
| 50 | for (i = 0; i < TEST_COUNT; i++) { |
| 51 | kfree(v[i]); |
| 52 | } |
| 53 | time2 = get_cycles(); |
| 54 | time = time2 - time1; |
| 55 | |
| 56 | printk(KERN_ALERT "%i times kfree = \n", i); |
| 57 | printk(KERN_ALERT "number of loops: %d\n", TEST_COUNT); |
| 58 | printk(KERN_ALERT "total time: %llu\n", time); |
| 59 | time = div_long_long_rem(time, TEST_COUNT, &rem); |
| 60 | printk(KERN_ALERT "-> %llu cycles\n", time); |
| 61 | } |
| 62 | printk("Fast slub free: %u\n", atomic_read(&slub_fast_count)); |
| 63 | printk("Slow slub free: %u\n", atomic_read(&slub_slow_count)); |
| 64 | |
| 65 | printk(KERN_ALERT "2. Kmalloc: alloc/free test\n"); |
| 66 | for (size = 8; size <= PAGE_SIZE << 2; size <<= 1) { |
| 67 | time1 = get_cycles(); |
| 68 | for (i = 0; i < TEST_COUNT; i++) { |
| 69 | kfree(kmalloc(size, GFP_KERNEL)); |
| 70 | } |
| 71 | time2 = get_cycles(); |
| 72 | time = time2 - time1; |
| 73 | |
| 74 | printk(KERN_ALERT "%i times kmalloc(%d)/kfree = \n", i, size); |
| 75 | printk(KERN_ALERT "number of loops: %d\n", TEST_COUNT); |
| 76 | printk(KERN_ALERT "total time: %llu\n", time); |
| 77 | time = div_long_long_rem(time, TEST_COUNT, &rem); |
| 78 | printk(KERN_ALERT "-> %llu cycles\n", time); |
| 79 | } |
| 80 | printk("Fast slub free: %u\n", atomic_read(&slub_fast_count)); |
| 81 | printk("Slow slub free: %u\n", atomic_read(&slub_slow_count)); |
| 82 | #if 0 |
| 83 | printk(KERN_ALERT "3. kmem_cache_alloc: Repeatedly allocate then free test\n"); |
| 84 | for (size = 3; size <= PAGE_SHIFT; size ++) { |
| 85 | time1 = get_cycles(); |
| 86 | for (i = 0; i < TEST_COUNT; i++) { |
| 87 | v[i] = kmem_cache_alloc(kmalloc_caches + size, GFP_KERNEL); |
| 88 | } |
| 89 | time2 = get_cycles(); |
| 90 | time = time2 - time1; |
| 91 | |
| 92 | printk(KERN_ALERT "%d times kmem_cache_alloc(%d) = \n", i, 1 << size); |
| 93 | printk(KERN_ALERT "number of loops: %d\n", TEST_COUNT); |
| 94 | printk(KERN_ALERT "total time: %llu\n", time); |
| 95 | time = div_long_long_rem(time, TEST_COUNT, &rem); |
| 96 | printk(KERN_ALERT "-> %llu cycles\n", time); |
| 97 | |
| 98 | time1 = get_cycles(); |
| 99 | for (i = 0; i < TEST_COUNT; i++) { |
| 100 | kmem_cache_free(kmalloc_caches + size, v[i]); |
| 101 | } |
| 102 | time2 = get_cycles(); |
| 103 | time = time2 - time1; |
| 104 | |
| 105 | printk(KERN_ALERT "%i times kmem_cache_free = \n", i); |
| 106 | printk(KERN_ALERT "number of loops: %d\n", TEST_COUNT); |
| 107 | printk(KERN_ALERT "total time: %llu\n", time); |
| 108 | time = div_long_long_rem(time, TEST_COUNT, &rem); |
| 109 | printk(KERN_ALERT "-> %llu cycles\n", time); |
| 110 | } |
| 111 | |
| 112 | printk(KERN_ALERT "4. kmem_cache_alloc: alloc/free test\n"); |
| 113 | for (size = 3; size <= PAGE_SHIFT; size++) { |
| 114 | time1 = get_cycles(); |
| 115 | for (i = 0; i < TEST_COUNT; i++) { |
| 116 | kmem_cache_free(kmalloc_caches + size, |
| 117 | kmem_cache_alloc(kmalloc_caches + size, |
| 118 | GFP_KERNEL)); |
| 119 | } |
| 120 | time2 = get_cycles(); |
| 121 | time = time2 - time1; |
| 122 | |
| 123 | printk(KERN_ALERT "%d times kmem_cache_alloc(%d)/kmem_cache_free = \n", i, 1 << size); |
| 124 | printk(KERN_ALERT "number of loops: %d\n", TEST_COUNT); |
| 125 | printk(KERN_ALERT "total time: %llu\n", time); |
| 126 | time = div_long_long_rem(time, TEST_COUNT, &rem); |
| 127 | printk(KERN_ALERT "-> %llu cycles\n", time); |
| 128 | } |
| 129 | printk(KERN_ALERT "5. kmem_cache_zalloc: Repeatedly allocate then free test\n"); |
| 130 | for (size = 3; size <= PAGE_SHIFT; size ++) { |
| 131 | time1 = get_cycles(); |
| 132 | for (i = 0; i < TEST_COUNT; i++) { |
| 133 | v[i] = kmem_cache_zalloc(kmalloc_caches + size, GFP_KERNEL); |
| 134 | } |
| 135 | time2 = get_cycles(); |
| 136 | time = time2 - time1; |
| 137 | |
| 138 | printk(KERN_ALERT "%d times kmem_cache_zalloc(%d) = \n", i, 1 << size); |
| 139 | printk(KERN_ALERT "number of loops: %d\n", TEST_COUNT); |
| 140 | printk(KERN_ALERT "total time: %llu\n", time); |
| 141 | time = div_long_long_rem(time, TEST_COUNT, &rem); |
| 142 | printk(KERN_ALERT "-> %llu cycles\n", time); |
| 143 | |
| 144 | time1 = get_cycles(); |
| 145 | for (i = 0; i < TEST_COUNT; i++) { |
| 146 | kmem_cache_free(kmalloc_caches + size, v[i]); |
| 147 | } |
| 148 | time2 = get_cycles(); |
| 149 | time = time2 - time1; |
| 150 | |
| 151 | printk(KERN_ALERT "%i times kmem_cache_free = \n", i); |
| 152 | printk(KERN_ALERT "number of loops: %d\n", TEST_COUNT); |
| 153 | printk(KERN_ALERT "total time: %llu\n", time); |
| 154 | time = div_long_long_rem(time, TEST_COUNT, &rem); |
| 155 | printk(KERN_ALERT "-> %llu cycles\n", time); |
| 156 | } |
| 157 | |
| 158 | printk(KERN_ALERT "6. kmem_cache_zalloc: alloc/free test\n"); |
| 159 | for (size = 3; size <= PAGE_SHIFT; size++) { |
| 160 | time1 = get_cycles(); |
| 161 | for (i = 0; i < TEST_COUNT; i++) { |
| 162 | kmem_cache_free(kmalloc_caches + size, |
| 163 | kmem_cache_zalloc(kmalloc_caches + size, |
| 164 | GFP_KERNEL)); |
| 165 | } |
| 166 | time2 = get_cycles(); |
| 167 | time = time2 - time1; |
| 168 | |
| 169 | printk(KERN_ALERT "%d times kmem_cache_zalloc(%d)/kmem_cache_free = \n", i, 1 << size); |
| 170 | printk(KERN_ALERT "number of loops: %d\n", TEST_COUNT); |
| 171 | printk(KERN_ALERT "total time: %llu\n", time); |
| 172 | time = div_long_long_rem(time, TEST_COUNT, &rem); |
| 173 | printk(KERN_ALERT "-> %llu cycles\n", time); |
| 174 | |
| 175 | } |
| 176 | #endif //0 |
| 177 | kfree(v); |
| 178 | return -EAGAIN; /* Fail will directly unload the module */ |
| 179 | } |
| 180 | |
| 181 | static void slub_test_exit(void) |
| 182 | { |
| 183 | printk(KERN_ALERT "test exit\n"); |
| 184 | } |
| 185 | |
| 186 | module_init(slub_test_init) |
| 187 | module_exit(slub_test_exit) |
| 188 | |
| 189 | MODULE_LICENSE("GPL"); |
| 190 | MODULE_AUTHOR("Mathieu Desnoyers"); |
| 191 | MODULE_DESCRIPTION("SLUB test"); |