/** * @file cpu_buffer.h * * @remark Copyright 2002 OProfile authors * @remark Read the file COPYING * * @author John Levon <levon@movementarian.org> */ #ifndef OPROFILE_CPU_BUFFER_H #define OPROFILE_CPU_BUFFER_H #include <linux/types.h> #include <linux/spinlock.h> #include <linux/workqueue.h> #include <linux/cache.h> #include <linux/sched.h> struct task_struct; int alloc_cpu_buffers(void); void free_cpu_buffers(void); void start_cpu_work(void); void end_cpu_work(void); /* CPU buffer is composed of such entries (which are * also used for context switch notes) */ struct op_sample { unsigned long eip; unsigned long event; }; struct oprofile_cpu_buffer { volatile unsigned long head_pos; volatile unsigned long tail_pos; unsigned long buffer_size; struct task_struct *last_task; int last_is_kernel; int tracing; struct op_sample *buffer; unsigned long sample_received; unsigned long sample_lost_overflow; unsigned long backtrace_aborted; unsigned long sample_invalid_eip; int cpu; struct delayed_work work; }; DECLARE_PER_CPU(struct oprofile_cpu_buffer, cpu_buffer); void cpu_buffer_reset(struct oprofile_cpu_buffer *cpu_buf); static inline struct op_sample *cpu_buffer_write_entry(struct oprofile_cpu_buffer *cpu_buf) { return &cpu_buf->buffer[cpu_buf->head_pos]; } static inline struct op_sample *cpu_buffer_read_entry(struct oprofile_cpu_buffer *cpu_buf) { return &cpu_buf->buffer[cpu_buf->tail_pos]; } /* transient events for the CPU buffer -> event buffer */ #define CPU_IS_KERNEL 1 #define CPU_TRACE_BEGIN 2 #define IBS_FETCH_BEGIN 3 #define IBS_OP_BEGIN 4 #endif /* OPROFILE_CPU_BUFFER_H */