2 * @file oprofile_files.c
4 * @remark Copyright 2002 OProfile authors
5 * @remark Read the file COPYING
7 * @author John Levon <levon@movementarian.org>
11 #include <linux/oprofile.h>
12 #include <linux/jiffies.h>
14 #include "event_buffer.h"
15 #include "oprofile_stats.h"
18 #define BUFFER_SIZE_DEFAULT 131072
19 #define CPU_BUFFER_SIZE_DEFAULT 8192
20 #define BUFFER_WATERSHED_DEFAULT 32768 /* FIXME: tune */
21 #define TIME_SLICE_DEFAULT 1
23 unsigned long oprofile_buffer_size;
24 unsigned long oprofile_cpu_buffer_size;
25 unsigned long oprofile_buffer_watershed;
26 unsigned long oprofile_time_slice;
28 #ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
30 static ssize_t timeout_read(struct file *file, char __user *buf,
31 size_t count, loff_t *offset)
33 return oprofilefs_ulong_to_user(jiffies_to_msecs(oprofile_time_slice),
38 static ssize_t timeout_write(struct file *file, char const __user *buf,
39 size_t count, loff_t *offset)
47 retval = oprofilefs_ulong_from_user(&val, buf, count);
51 retval = oprofile_set_timeout(val);
59 static const struct file_operations timeout_fops = {
61 .write = timeout_write,
67 static ssize_t depth_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
69 return oprofilefs_ulong_to_user(oprofile_backtrace_depth, buf, count,
74 static ssize_t depth_write(struct file *file, char const __user *buf, size_t count, loff_t *offset)
82 if (!oprofile_ops.backtrace)
85 retval = oprofilefs_ulong_from_user(&val, buf, count);
89 retval = oprofile_set_ulong(&oprofile_backtrace_depth, val);
97 static const struct file_operations depth_fops = {
103 static ssize_t pointer_size_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
105 return oprofilefs_ulong_to_user(sizeof(void *), buf, count, offset);
109 static const struct file_operations pointer_size_fops = {
110 .read = pointer_size_read,
114 static ssize_t cpu_type_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
116 return oprofilefs_str_to_user(oprofile_ops.cpu_type, buf, count, offset);
120 static const struct file_operations cpu_type_fops = {
121 .read = cpu_type_read,
125 static ssize_t enable_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
127 return oprofilefs_ulong_to_user(oprofile_started, buf, count, offset);
131 static ssize_t enable_write(struct file *file, char const __user *buf, size_t count, loff_t *offset)
139 retval = oprofilefs_ulong_from_user(&val, buf, count);
144 retval = oprofile_start();
154 static const struct file_operations enable_fops = {
156 .write = enable_write,
160 static ssize_t dump_write(struct file *file, char const __user *buf, size_t count, loff_t *offset)
162 wake_up_buffer_waiter();
167 static const struct file_operations dump_fops = {
171 void oprofile_create_files(struct super_block *sb, struct dentry *root)
173 /* reinitialize default values */
174 oprofile_buffer_size = BUFFER_SIZE_DEFAULT;
175 oprofile_cpu_buffer_size = CPU_BUFFER_SIZE_DEFAULT;
176 oprofile_buffer_watershed = BUFFER_WATERSHED_DEFAULT;
177 oprofile_time_slice = msecs_to_jiffies(TIME_SLICE_DEFAULT);
179 oprofilefs_create_file(sb, root, "enable", &enable_fops);
180 oprofilefs_create_file_perm(sb, root, "dump", &dump_fops, 0666);
181 oprofilefs_create_file(sb, root, "buffer", &event_buffer_fops);
182 oprofilefs_create_ulong(sb, root, "buffer_size", &oprofile_buffer_size);
183 oprofilefs_create_ulong(sb, root, "buffer_watershed", &oprofile_buffer_watershed);
184 oprofilefs_create_ulong(sb, root, "cpu_buffer_size", &oprofile_cpu_buffer_size);
185 oprofilefs_create_file(sb, root, "cpu_type", &cpu_type_fops);
186 oprofilefs_create_file(sb, root, "backtrace_depth", &depth_fops);
187 oprofilefs_create_file(sb, root, "pointer_size", &pointer_size_fops);
188 #ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
189 oprofilefs_create_file(sb, root, "time_slice", &timeout_fops);
191 oprofile_create_stats_files(sb, root);
192 if (oprofile_ops.create_files)
193 oprofile_ops.create_files(sb, root);