Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 1 | /** |
| 2 | * @file cpu_buffer.h |
| 3 | * |
| 4 | * @remark Copyright 2002 OProfile authors |
| 5 | * @remark Read the file COPYING |
| 6 | * |
| 7 | * @author John Levon <levon@movementarian.org> |
| 8 | */ |
| 9 | |
| 10 | #ifndef OPROFILE_CPU_BUFFER_H |
| 11 | #define OPROFILE_CPU_BUFFER_H |
| 12 | |
| 13 | #include <linux/types.h> |
| 14 | #include <linux/spinlock.h> |
| 15 | #include <linux/workqueue.h> |
| 16 | #include <linux/cache.h> |
| 17 | |
| 18 | struct task_struct; |
| 19 | |
| 20 | int alloc_cpu_buffers(void); |
| 21 | void free_cpu_buffers(void); |
| 22 | |
| 23 | void start_cpu_work(void); |
| 24 | void end_cpu_work(void); |
| 25 | |
| 26 | /* CPU buffer is composed of such entries (which are |
| 27 | * also used for context switch notes) |
| 28 | */ |
| 29 | struct op_sample { |
| 30 | unsigned long eip; |
| 31 | unsigned long event; |
| 32 | }; |
| 33 | |
| 34 | struct oprofile_cpu_buffer { |
| 35 | volatile unsigned long head_pos; |
| 36 | volatile unsigned long tail_pos; |
| 37 | unsigned long buffer_size; |
| 38 | struct task_struct * last_task; |
| 39 | int last_is_kernel; |
| 40 | int tracing; |
| 41 | struct op_sample * buffer; |
| 42 | unsigned long sample_received; |
| 43 | unsigned long sample_lost_overflow; |
| 44 | unsigned long backtrace_aborted; |
| 45 | int cpu; |
| 46 | struct work_struct work; |
| 47 | } ____cacheline_aligned; |
| 48 | |
| 49 | extern struct oprofile_cpu_buffer cpu_buffer[]; |
| 50 | |
| 51 | void cpu_buffer_reset(struct oprofile_cpu_buffer * cpu_buf); |
| 52 | |
| 53 | /* transient events for the CPU buffer -> event buffer */ |
| 54 | #define CPU_IS_KERNEL 1 |
| 55 | #define CPU_TRACE_BEGIN 2 |
| 56 | |
| 57 | #endif /* OPROFILE_CPU_BUFFER_H */ |