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/** * @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> 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; int cpu; struct delayed_work work; } ____cacheline_aligned; extern struct oprofile_cpu_buffer cpu_buffer[]; void cpu_buffer_reset(struct oprofile_cpu_buffer * cpu_buf); /* transient events for the CPU buffer -> event buffer */ #define CPU_IS_KERNEL 1 #define CPU_TRACE_BEGIN 2 #endif /* OPROFILE_CPU_BUFFER_H */ |