Revert "Oprofile Multiplexing Patch"

Reverting commit 1a960b402a51d80abf54e3f8e4972374ffe5f22d for the main
branch. Multiplexing will be tracked on a separate feature branch.

Conflicts:

    arch/x86/oprofile/nmi_int.c

3 files changed, 6 insertions, 95 deletions

diff --git a/drivers/oprofile/oprof.c b/drivers/oprofile/oprof.c
index b2fa5df..2c64517 100644
--- a/drivers/oprofile/oprof.c
+++ b/drivers/oprofile/oprof.c
@@ -12,8 +12,6 @@
 #include <linux/init.h>
 #include <linux/oprofile.h>
 #include <linux/moduleparam.h>
-#include <linux/workqueue.h>
-#include <linux/time.h>
 #include <asm/mutex.h>
 
 #include "oprof.h"
@@ -21,18 +19,13 @@
 #include "cpu_buffer.h"
 #include "buffer_sync.h"
 #include "oprofile_stats.h"
-
-static unsigned long is_setup;
-static void switch_worker(struct work_struct *work);
-static DECLARE_DELAYED_WORK(switch_work, switch_worker);
-static DEFINE_MUTEX(start_mutex);
  
 struct oprofile_operations oprofile_ops;
 
-unsigned long timeout_jiffies;
 unsigned long oprofile_started;
 unsigned long backtrace_depth;
-/* Multiplexing defaults at 1 msec*/
+static unsigned long is_setup;
+static DEFINE_MUTEX(start_mutex);
 
 /* timer
    0 - use performance monitoring hardware if available
@@ -94,16 +87,6 @@ out:
 	return err;
 }
 
-static void start_switch_worker(void)
-{
-	schedule_delayed_work(&switch_work, timeout_jiffies);
-}
-
-static void switch_worker(struct work_struct *work)
-{
-	if (!oprofile_ops.switch_events())
-		start_switch_worker();
-}
 
 /* Actually start profiling (echo 1>/dev/oprofile/enable) */
 int oprofile_start(void)
@@ -111,6 +94,7 @@ int oprofile_start(void)
 	int err = -EINVAL;
  
 	mutex_lock(&start_mutex);
+ 
 	if (!is_setup)
 		goto out;
 
@@ -124,9 +108,6 @@ int oprofile_start(void)
 	if ((err = oprofile_ops.start()))
 		goto out;
 
-	if (oprofile_ops.switch_events)
-		start_switch_worker();
-
 	oprofile_started = 1;
 out:
 	mutex_unlock(&start_mutex);
@@ -142,7 +123,6 @@ void oprofile_stop(void)
 		goto out;
 	oprofile_ops.stop();
 	oprofile_started = 0;
-	cancel_delayed_work_sync(&switch_work);
 	/* wake up the daemon to read what remains */
 	wake_up_buffer_waiter();
 out:
@@ -175,32 +155,6 @@ post_sync:
 	mutex_unlock(&start_mutex);
 }
 
-/* User inputs in ms, converts to jiffies */
-int oprofile_set_timeout(unsigned long val_msec)
-{
-	int err = 0;
-
-	mutex_lock(&start_mutex);
-
-	if (oprofile_started) {
-		err = -EBUSY;
-		goto out;
-	}
-
-	if (!oprofile_ops.switch_events) {
-		err = -EINVAL;
-		goto out;
-	}
-
-	timeout_jiffies = msecs_to_jiffies(val_msec);
-	if (timeout_jiffies == MAX_JIFFY_OFFSET)
-		timeout_jiffies = msecs_to_jiffies(1);
-
-out:
-	mutex_unlock(&start_mutex);
-	return err;
-
-}
 
 int oprofile_set_backtrace(unsigned long val)
 {
@@ -225,16 +179,10 @@ out:
 	return err;
 }
 
-static void __init oprofile_switch_timer_init(void)
-{
-	timeout_jiffies = msecs_to_jiffies(1);
-}
-
 static int __init oprofile_init(void)
 {
 	int err;
 
-	oprofile_switch_timer_init();
 	err = oprofile_arch_init(&oprofile_ops);
 
 	if (err < 0 || timer) {
diff --git a/drivers/oprofile/oprof.h b/drivers/oprofile/oprof.h
index c4406a7..1832365 100644
--- a/drivers/oprofile/oprof.h
+++ b/drivers/oprofile/oprof.h
@@ -27,8 +27,7 @@ extern unsigned long fs_buffer_watershed;
 extern struct oprofile_operations oprofile_ops;
 extern unsigned long oprofile_started;
 extern unsigned long backtrace_depth;
-extern unsigned long timeout_jiffies;
-
+ 
 struct super_block;
 struct dentry;
 
@@ -36,6 +35,5 @@ void oprofile_create_files(struct super_block * sb, struct dentry * root);
 void oprofile_timer_init(struct oprofile_operations * ops);
 
 int oprofile_set_backtrace(unsigned long depth);
-int oprofile_set_timeout(unsigned long time);
  
 #endif /* OPROF_H */
diff --git a/drivers/oprofile/oprofile_files.c b/drivers/oprofile/oprofile_files.c
index cc4f5a1..ef953ba 100644
--- a/drivers/oprofile/oprofile_files.c
+++ b/drivers/oprofile/oprofile_files.c
@@ -9,7 +9,6 @@
 
 #include <linux/fs.h>
 #include <linux/oprofile.h>
-#include <linux/jiffies.h>
 
 #include "event_buffer.h"
 #include "oprofile_stats.h"
@@ -19,40 +18,6 @@ unsigned long fs_buffer_size = 131072;
 unsigned long fs_cpu_buffer_size = 8192;
 unsigned long fs_buffer_watershed = 32768; /* FIXME: tune */
 
-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,
-};
-
-
 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);
@@ -120,10 +85,11 @@ static ssize_t enable_write(struct file * file, char const __user * buf, size_t
 
 	if (*offset)
 		return -EINVAL;
+
 	retval = oprofilefs_ulong_from_user(&val, buf, count);
 	if (retval)
 		return retval;
-
+ 
 	if (val)
 		retval = oprofile_start();
 	else
@@ -163,7 +129,6 @@ 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);
-	oprofilefs_create_file(sb, root, "timeout_ms", &timeout_fops);
 	oprofile_create_stats_files(sb, root);
 	if (oprofile_ops.create_files)
 		oprofile_ops.create_files(sb, root);