[PATCH] oprofile - hooks

This implements the simple hooks we need to catch unmappings, and to
make sure no stale task_struct*'s are ever used by the main oprofile
core mechanism.  If disabled, it compiles to nothing.

1 files changed, 56 insertions, 0 deletions

diff --git a/include/linux/profile.h b/include/linux/profile.h
new file mode 100644
index 000000000000..15c1e91198b0
--- /dev/null
+++ b/include/linux/profile.h
@@ -0,0 +1,56 @@
+#ifndef _LINUX_PROFILE_H
+#define _LINUX_PROFILE_H
+
+#ifdef __KERNEL__
+ 
+#include <linux/kernel.h>
+#include <linux/config.h>
+#include <linux/init.h>
+#include <asm/errno.h>
+ 
+enum profile_type {
+	EXIT_TASK,
+	EXIT_MMAP,
+	EXEC_UNMAP
+};
+
+#ifdef CONFIG_PROFILING
+ 
+struct notifier_block;
+struct task_struct;
+struct mm_struct;
+ 
+/* task is in do_exit() */
+void profile_exit_task(struct task_struct * task);
+ 
+/* change of vma mappings */
+void profile_exec_unmap(struct mm_struct * mm);
+
+/* exit of all vmas for a task */
+void profile_exit_mmap(struct mm_struct * mm);
+
+int profile_event_register(enum profile_type, struct notifier_block * n);
+
+int profile_event_unregister(enum profile_type, struct notifier_block * n);
+ 
+#else
+
+static inline int profile_event_register(enum profile_type t, struct notifier_block * n)
+{
+	return -ENOSYS;
+}
+ 
+static inline int profile_event_unregister(enum profile_type t, struct notifier_block * n)
+{
+	return -ENOSYS;
+}
+ 
+#define profile_exit_task(a) do { } while (0)
+#define profile_exec_unmap(a) do { } while (0)
+#define profile_exit_mmap(a) do { } while (0)
+ 
+#endif /* CONFIG_PROFILING */
+ 
+#endif /* __KERNEL__ */
+ 
+#endif /* _LINUX_PROFILE_H */