oprofile: Implement performance counter multiplexing
[linux-2.6.git] / drivers / oprofile / oprofile_files.c
index 241804a..468ec3e 100644 (file)
@@ -9,18 +9,63 @@
 
 #include <linux/fs.h>
 #include <linux/oprofile.h>
+#include <linux/jiffies.h>
 
 #include "event_buffer.h"
 #include "oprofile_stats.h"
 #include "oprof.h"
-unsigned long fs_buffer_size = 131072;
-unsigned long fs_cpu_buffer_size = 8192;
-unsigned long fs_buffer_watershed = 32768; /* FIXME: tune */
+
+#define BUFFER_SIZE_DEFAULT            131072
+#define CPU_BUFFER_SIZE_DEFAULT                8192
+#define BUFFER_WATERSHED_DEFAULT       32768   /* FIXME: tune */
+
+unsigned long oprofile_buffer_size;
+unsigned long oprofile_cpu_buffer_size;
+unsigned long oprofile_buffer_watershed;
+
+#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(timeout_jiffies),
+                               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)
+               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,
+};
+
+#endif
+
 
 static ssize_t depth_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
 {
-       return oprofilefs_ulong_to_user(backtrace_depth, buf, count, offset);
+       return oprofilefs_ulong_to_user(oprofile_backtrace_depth, buf, count,
+                                       offset);
 }
 
 
@@ -49,7 +94,7 @@ static const struct file_operations depth_fops = {
        .write          = depth_write
 };
 
+
 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);
@@ -65,13 +110,13 @@ static ssize_t cpu_type_read(struct file *file, char __user *buf, size_t count,
 {
        return oprofilefs_str_to_user(oprofile_ops.cpu_type, buf, count, offset);
 }
+
+
 static const struct file_operations cpu_type_fops = {
        .read           = cpu_type_read,
 };
+
+
 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);
@@ -89,7 +134,7 @@ static ssize_t enable_write(struct file *file, char const __user *buf, size_t co
        retval = oprofilefs_ulong_from_user(&val, buf, count);
        if (retval)
                return retval;
+
        if (val)
                retval = oprofile_start();
        else
@@ -100,7 +145,7 @@ static ssize_t enable_write(struct file *file, char const __user *buf, size_t co
        return count;
 }
 
+
 static const struct file_operations enable_fops = {
        .read           = enable_read,
        .write          = enable_write,
@@ -117,18 +162,26 @@ static ssize_t dump_write(struct file *file, char const __user *buf, size_t coun
 static const struct file_operations dump_fops = {
        .write          = dump_write,
 };
+
 void oprofile_create_files(struct super_block *sb, 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;
+
        oprofilefs_create_file(sb, root, "enable", &enable_fops);
        oprofilefs_create_file_perm(sb, root, "dump", &dump_fops, 0666);
        oprofilefs_create_file(sb, root, "buffer", &event_buffer_fops);
-       oprofilefs_create_ulong(sb, root, "buffer_size", &fs_buffer_size);
-       oprofilefs_create_ulong(sb, root, "buffer_watershed", &fs_buffer_watershed);
-       oprofilefs_create_ulong(sb, root, "cpu_buffer_size", &fs_cpu_buffer_size);
-       oprofilefs_create_file(sb, root, "cpu_type", &cpu_type_fops); 
+       oprofilefs_create_ulong(sb, root, "buffer_size", &oprofile_buffer_size);
+       oprofilefs_create_ulong(sb, root, "buffer_watershed", &oprofile_buffer_watershed);
+       oprofilefs_create_ulong(sb, root, "cpu_buffer_size", &oprofile_cpu_buffer_size);
+       oprofilefs_create_file(sb, root, "cpu_type", &cpu_type_fops);
        oprofilefs_create_file(sb, root, "backtrace_depth", &depth_fops);
        oprofilefs_create_file(sb, root, "pointer_size", &pointer_size_fops);
+#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
+       oprofilefs_create_file(sb, root, "time_slice", &timeout_fops);
+#endif
        oprofile_create_stats_files(sb, root);
        if (oprofile_ops.create_files)
                oprofile_ops.create_files(sb, root);