]>
git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/blob - drivers/oprofile/cpu_buffer.h
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);
28 void flush_cpu_work(void);
30 /* CPU buffer is composed of such entries (which are
31 * also used for context switch notes)
36 unsigned long data
[0];
41 struct oprofile_cpu_buffer
{
42 unsigned long buffer_size
;
43 struct task_struct
*last_task
;
46 unsigned long sample_received
;
47 unsigned long sample_lost_overflow
;
48 unsigned long backtrace_aborted
;
49 unsigned long sample_invalid_eip
;
51 struct delayed_work work
;
54 DECLARE_PER_CPU(struct oprofile_cpu_buffer
, op_cpu_buffer
);
57 * Resets the cpu buffer to a sane state.
59 * reset these to invalid values; the next sample collected will
60 * populate the buffer with proper values to initialize the buffer
62 static inline void op_cpu_buffer_reset(int cpu
)
64 struct oprofile_cpu_buffer
*cpu_buf
= &per_cpu(op_cpu_buffer
, cpu
);
66 cpu_buf
->last_is_kernel
= -1;
67 cpu_buf
->last_task
= NULL
;
71 * op_cpu_buffer_add_data() and op_cpu_buffer_write_commit() may be
72 * called only if op_cpu_buffer_write_reserve() did not return NULL or
73 * entry->event != NULL, otherwise entry->size or entry->event will be
78 *op_cpu_buffer_write_reserve(struct op_entry
*entry
, unsigned long size
);
79 int op_cpu_buffer_write_commit(struct op_entry
*entry
);
80 struct op_sample
*op_cpu_buffer_read_entry(struct op_entry
*entry
, int cpu
);
81 unsigned long op_cpu_buffer_entries(int cpu
);
83 /* returns the remaining free size of data in the entry */
85 int op_cpu_buffer_add_data(struct op_entry
*entry
, unsigned long val
)
95 /* returns the size of data in the entry */
97 int op_cpu_buffer_get_size(struct op_entry
*entry
)
102 /* returns 0 if empty or the size of data including the current value */
104 int op_cpu_buffer_get_data(struct op_entry
*entry
, unsigned long *val
)
106 int size
= entry
->size
;
115 /* extra data flags */
116 #define KERNEL_CTX_SWITCH (1UL << 0)
117 #define IS_KERNEL (1UL << 1)
118 #define TRACE_BEGIN (1UL << 2)
119 #define USER_CTX_SWITCH (1UL << 3)
121 #endif /* OPROFILE_CPU_BUFFER_H */