4 * @remark Copyright 2002 OProfile authors
5 * @remark Read the file COPYING
7 * @author John Levon <levon@movementarian.org>
10 #ifndef OPROFILE_CPU_BUFFER_H
11 #define OPROFILE_CPU_BUFFER_H
13 #include <linux/types.h>
14 #include <linux/spinlock.h>
15 #include <linux/workqueue.h>
16 #include <linux/cache.h>
17 #include <linux/sched.h>
18 #include <linux/ring_buffer.h>
22 int alloc_cpu_buffers(void);
23 void free_cpu_buffers(void);
25 void start_cpu_work(void);
26 void end_cpu_work(void);
28 /* CPU buffer is composed of such entries (which are
29 * also used for context switch notes)
37 struct ring_buffer_event *event;
38 struct op_sample *sample;
39 unsigned long irq_flags;
42 struct oprofile_cpu_buffer {
43 volatile unsigned long head_pos;
44 volatile unsigned long tail_pos;
45 unsigned long buffer_size;
46 struct task_struct *last_task;
49 unsigned long sample_received;
50 unsigned long sample_lost_overflow;
51 unsigned long backtrace_aborted;
52 unsigned long sample_invalid_eip;
54 struct delayed_work work;
57 DECLARE_PER_CPU(struct oprofile_cpu_buffer, cpu_buffer);
60 * Resets the cpu buffer to a sane state.
62 * reset these to invalid values; the next sample collected will
63 * populate the buffer with proper values to initialize the buffer
65 static inline void op_cpu_buffer_reset(int cpu)
67 struct oprofile_cpu_buffer *cpu_buf = &per_cpu(cpu_buffer, cpu);
69 cpu_buf->last_is_kernel = -1;
70 cpu_buf->last_task = NULL;
73 int op_cpu_buffer_write_entry(struct op_entry *entry);
74 int op_cpu_buffer_write_commit(struct op_entry *entry);
75 struct op_sample *op_cpu_buffer_read_entry(int cpu);
76 unsigned long op_cpu_buffer_entries(int cpu);
78 /* transient events for the CPU buffer -> event buffer */
79 #define CPU_IS_KERNEL 1
80 #define CPU_TRACE_BEGIN 2
81 #define IBS_FETCH_BEGIN 3
82 #define IBS_OP_BEGIN 4
84 #endif /* OPROFILE_CPU_BUFFER_H */