1 files changed, 121 insertions, 0 deletions
diff --git a/kernel/profile.c b/kernel/profile.c
new file mode 100644
index 000000000000..756f142b1f35
--- /dev/null
+++ b/kernel/profile.c
@@ -0,0 +1,121 @@
+/*
+ *  linux/kernel/profile.c
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/profile.h>
+#include <linux/bootmem.h>
+#include <linux/notifier.h>
+#include <linux/mm.h>
+
+extern char _stext, _etext;
+
+unsigned int * prof_buffer;
+unsigned long prof_len;
+unsigned long prof_shift;
+
+int __init profile_setup(char * str)
+{
+	int par;
+	if (get_option(&str,&par))
+		prof_shift = par;
+	return 1;
+}
+
+
+void __init profile_init(void)
+{
+	unsigned int size;
+ 
+	if (!prof_shift) 
+		return;
+ 
+	/* only text is profiled */
+	prof_len = (unsigned long) &_etext - (unsigned long) &_stext;
+	prof_len >>= prof_shift;
+		
+	size = prof_len * sizeof(unsigned int) + PAGE_SIZE - 1;
+	prof_buffer = (unsigned int *) alloc_bootmem(size);
+}
+
+/* Profile event notifications */
+ 
+#ifdef CONFIG_PROFILING
+ 
+static DECLARE_RWSEM(profile_rwsem);
+static struct notifier_block * exit_task_notifier;
+static struct notifier_block * exit_mmap_notifier;
+static struct notifier_block * exec_unmap_notifier;
+ 
+void profile_exit_task(struct task_struct * task)
+{
+	down_read(&profile_rwsem);
+	notifier_call_chain(&exit_task_notifier, 0, task);
+	up_read(&profile_rwsem);
+}
+ 
+void profile_exit_mmap(struct mm_struct * mm)
+{
+	down_read(&profile_rwsem);
+	notifier_call_chain(&exit_mmap_notifier, 0, mm);
+	up_read(&profile_rwsem);
+}
+
+void profile_exec_unmap(struct mm_struct * mm)
+{
+	down_read(&profile_rwsem);
+	notifier_call_chain(&exec_unmap_notifier, 0, mm);
+	up_read(&profile_rwsem);
+}
+
+int profile_event_register(enum profile_type type, struct notifier_block * n)
+{
+	int err = -EINVAL;
+ 
+	down_write(&profile_rwsem);
+ 
+	switch (type) {
+		case EXIT_TASK:
+			err = notifier_chain_register(&exit_task_notifier, n);
+			break;
+		case EXIT_MMAP:
+			err = notifier_chain_register(&exit_mmap_notifier, n);
+			break;
+		case EXEC_UNMAP:
+			err = notifier_chain_register(&exec_unmap_notifier, n);
+			break;
+	}
+ 
+	up_write(&profile_rwsem);
+ 
+	return err;
+}
+
+ 
+int profile_event_unregister(enum profile_type type, struct notifier_block * n)
+{
+	int err = -EINVAL;
+ 
+	down_write(&profile_rwsem);
+ 
+	switch (type) {
+		case EXIT_TASK:
+			err = notifier_chain_unregister(&exit_task_notifier, n);
+			break;
+		case EXIT_MMAP:
+			err = notifier_chain_unregister(&exit_mmap_notifier, n);
+			break;
+		case EXEC_UNMAP:
+			err = notifier_chain_unregister(&exec_unmap_notifier, n);
+			break;
+	}
+
+	up_write(&profile_rwsem);
+	return err;
+}
+
+#endif /* CONFIG_PROFILING */
+
+EXPORT_SYMBOL_GPL(profile_event_register);
+EXPORT_SYMBOL_GPL(profile_event_unregister);