/** * @file event_buffer.h * * @remark Copyright 2002 OProfile authors * @remark Read the file COPYING * * @author John Levon <levon@movementarian.org> */ #ifndef EVENT_BUFFER_H #define EVENT_BUFFER_H #include <linux/types.h> #include <asm/semaphore.h> int alloc_event_buffer(void); void free_event_buffer(void); /* wake up the process sleeping on the event file */ void wake_up_buffer_waiter(void); /* Each escaped entry is prefixed by ESCAPE_CODE * then one of the following codes, then the * relevant data. */ #define ESCAPE_CODE ~0UL #define CTX_SWITCH_CODE 1 #define CPU_SWITCH_CODE 2 #define COOKIE_SWITCH_CODE 3 #define KERNEL_ENTER_SWITCH_CODE 4 #define KERNEL_EXIT_SWITCH_CODE 5 #define MODULE_LOADED_CODE 6 #define CTX_TGID_CODE 7 #define TRACE_BEGIN_CODE 8 #define TRACE_END_CODE 9 #define INVALID_COOKIE ~0UL #define NO_COOKIE 0UL /* add data to the event buffer */ void add_event_entry(unsigned long data); extern struct file_operations event_buffer_fops; /* mutex between sync_cpu_buffers() and the * file reading code. */ extern struct semaphore buffer_sem; #endif /* EVENT_BUFFER_H */