4 * @remark Copyright 2002-2009 OProfile authors
5 * @remark Read the file COPYING
7 * @author John Levon <levon@movementarian.org>
8 * @author Robert Richter <robert.richter@amd.com>
11 #ifndef OPROFILE_CPU_BUFFER_H
12 #define OPROFILE_CPU_BUFFER_H
14 #include <linux/types.h>
15 #include <linux/spinlock.h>
16 #include <linux/workqueue.h>
17 #include <linux/cache.h>
18 #include <linux/sched.h>
19 #include <linux/ring_buffer.h>
23 int alloc_cpu_buffers(void);
24 void free_cpu_buffers(void);
26 void start_cpu_work(void);
27 void end_cpu_work(void);
29 /* CPU buffer is composed of such entries (which are
30 * also used for context switch notes)
35 unsigned long data
[0];
39 struct ring_buffer_event
*event
;
40 struct op_sample
*sample
;
41 unsigned long irq_flags
;
46 struct oprofile_cpu_buffer
{
47 unsigned long buffer_size
;
48 struct task_struct
*last_task
;
51 unsigned long sample_received
;
52 unsigned long sample_lost_overflow
;
53 unsigned long backtrace_aborted
;
54 unsigned long sample_invalid_eip
;
56 struct delayed_work work
;
59 DECLARE_PER_CPU(struct oprofile_cpu_buffer
, cpu_buffer
);
62 * Resets the cpu buffer to a sane state.
64 * reset these to invalid values; the next sample collected will
65 * populate the buffer with proper values to initialize the buffer
67 static inline void op_cpu_buffer_reset(int cpu
)
69 struct oprofile_cpu_buffer
*cpu_buf
= &per_cpu(cpu_buffer
, cpu
);
71 cpu_buf
->last_is_kernel
= -1;
72 cpu_buf
->last_task
= NULL
;
76 *op_cpu_buffer_write_reserve(struct op_entry
*entry
, unsigned long size
);
77 int op_cpu_buffer_write_commit(struct op_entry
*entry
);
78 struct op_sample
*op_cpu_buffer_read_entry(struct op_entry
*entry
, int cpu
);
79 unsigned long op_cpu_buffer_entries(int cpu
);
81 /* transient events for the CPU buffer -> event buffer */
82 #define CPU_IS_KERNEL 1
83 #define CPU_TRACE_BEGIN 2
84 #define IBS_FETCH_BEGIN 3
85 #define IBS_OP_BEGIN 4
87 #endif /* OPROFILE_CPU_BUFFER_H */