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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 | /** * @file oprofile_files.c * * @remark Copyright 2002 OProfile authors * @remark Read the file COPYING * * @author John Levon <levon@movementarian.org> */ #include <linux/fs.h> #include <linux/oprofile.h> #include <linux/jiffies.h> #include "event_buffer.h" #include "oprofile_stats.h" #include "oprof.h" #define BUFFER_SIZE_DEFAULT 131072 #define CPU_BUFFER_SIZE_DEFAULT 8192 #define BUFFER_WATERSHED_DEFAULT 32768 /* FIXME: tune */ #define TIME_SLICE_DEFAULT 1 unsigned long oprofile_buffer_size; unsigned long oprofile_cpu_buffer_size; unsigned long oprofile_buffer_watershed; unsigned long oprofile_time_slice; #ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX static ssize_t timeout_read(struct file *file, char __user *buf, size_t count, loff_t *offset) { return oprofilefs_ulong_to_user(jiffies_to_msecs(oprofile_time_slice), buf, count, offset); } static ssize_t timeout_write(struct file *file, char const __user *buf, size_t count, loff_t *offset) { unsigned long val; int retval; if (*offset) return -EINVAL; retval = oprofilefs_ulong_from_user(&val, buf, count); if (retval <= 0) return retval; retval = oprofile_set_timeout(val); if (retval) return retval; return count; } static const struct file_operations timeout_fops = { .read = timeout_read, .write = timeout_write, .llseek = default_llseek, }; #endif static ssize_t depth_read(struct file *file, char __user *buf, size_t count, loff_t *offset) { return oprofilefs_ulong_to_user(oprofile_backtrace_depth, buf, count, offset); } static ssize_t depth_write(struct file *file, char const __user *buf, size_t count, loff_t *offset) { unsigned long val; int retval; if (*offset) return -EINVAL; if (!oprofile_ops.backtrace) return -EINVAL; retval = oprofilefs_ulong_from_user(&val, buf, count); if (retval <= 0) return retval; retval = oprofile_set_ulong(&oprofile_backtrace_depth, val); if (retval) return retval; return count; } static const struct file_operations depth_fops = { .read = depth_read, .write = depth_write, .llseek = default_llseek, }; static ssize_t pointer_size_read(struct file *file, char __user *buf, size_t count, loff_t *offset) { return oprofilefs_ulong_to_user(sizeof(void *), buf, count, offset); } static const struct file_operations pointer_size_fops = { .read = pointer_size_read, .llseek = default_llseek, }; static ssize_t cpu_type_read(struct file *file, char __user *buf, size_t count, loff_t *offset) { return oprofilefs_str_to_user(oprofile_ops.cpu_type, buf, count, offset); } static const struct file_operations cpu_type_fops = { .read = cpu_type_read, .llseek = default_llseek, }; static ssize_t enable_read(struct file *file, char __user *buf, size_t count, loff_t *offset) { return oprofilefs_ulong_to_user(oprofile_started, buf, count, offset); } static ssize_t enable_write(struct file *file, char const __user *buf, size_t count, loff_t *offset) { unsigned long val; int retval; if (*offset) return -EINVAL; retval = oprofilefs_ulong_from_user(&val, buf, count); if (retval <= 0) return retval; retval = 0; if (val) retval = oprofile_start(); else oprofile_stop(); if (retval) return retval; return count; } static const struct file_operations enable_fops = { .read = enable_read, .write = enable_write, .llseek = default_llseek, }; static ssize_t dump_write(struct file *file, char const __user *buf, size_t count, loff_t *offset) { wake_up_buffer_waiter(); return count; } static const struct file_operations dump_fops = { .write = dump_write, .llseek = noop_llseek, }; void oprofile_create_files(struct dentry *root) { /* reinitialize default values */ oprofile_buffer_size = BUFFER_SIZE_DEFAULT; oprofile_cpu_buffer_size = CPU_BUFFER_SIZE_DEFAULT; oprofile_buffer_watershed = BUFFER_WATERSHED_DEFAULT; oprofile_time_slice = msecs_to_jiffies(TIME_SLICE_DEFAULT); oprofilefs_create_file(root, "enable", &enable_fops); oprofilefs_create_file_perm(root, "dump", &dump_fops, 0666); oprofilefs_create_file(root, "buffer", &event_buffer_fops); oprofilefs_create_ulong(root, "buffer_size", &oprofile_buffer_size); oprofilefs_create_ulong(root, "buffer_watershed", &oprofile_buffer_watershed); oprofilefs_create_ulong(root, "cpu_buffer_size", &oprofile_cpu_buffer_size); oprofilefs_create_file(root, "cpu_type", &cpu_type_fops); oprofilefs_create_file(root, "backtrace_depth", &depth_fops); oprofilefs_create_file(root, "pointer_size", &pointer_size_fops); #ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX oprofilefs_create_file(root, "time_slice", &timeout_fops); #endif oprofile_create_stats_files(root); if (oprofile_ops.create_files) oprofile_ops.create_files(root); } |