oprofile: Implement performance counter multiplexing

[safe/jmp/linux-2.6] / drivers / oprofile / oprofile_files.c

diff --git a/drivers/oprofile/oprofile_files.c b/drivers/oprofile/oprofile_files.c
index 5d36ffc..468ec3e 100644 (file)
--- a/drivers/oprofile/oprofile_files.c
+++ b/drivers/oprofile/oprofile_files.c
@@ -9,6 +9,7 @@
 
 #include <linux/fs.h>
 #include <linux/oprofile.h>
+#include <linux/jiffies.h>
 
 #include "event_buffer.h"
 #include "oprofile_stats.h"
@@ -22,6 +23,45 @@ 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(oprofile_backtrace_depth, buf, count,
@@ -139,6 +179,9 @@ void oprofile_create_files(struct super_block *sb, struct dentry *root)
        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);