4  * @remark Copyright 2002-2009 OProfile authors
11  * Each CPU has a local buffer that stores PC value/event
52 	cpu_buf->sample_lost_overflow++;  in oprofile_cpu_buffer_inc_smpl_lost()
79 		b->last_task = NULL;  in alloc_cpu_buffers()
80 		b->last_is_kernel = -1;  in alloc_cpu_buffers()
81 		b->tracing = 0;  in alloc_cpu_buffers()
82 		b->buffer_size = buffer_size;  in alloc_cpu_buffers()
83 		b->sample_received = 0;  in alloc_cpu_buffers()
84 		b->sample_lost_overflow = 0;  in alloc_cpu_buffers()
85 		b->backtrace_aborted = 0;  in alloc_cpu_buffers()
86 		b->sample_invalid_eip = 0;  in alloc_cpu_buffers()
87 		b->cpu = i;  in alloc_cpu_buffers()
88 		INIT_DELAYED_WORK(&b->work, wq_sync_buffer);  in alloc_cpu_buffers()
94 	return -ENOMEM;  in alloc_cpu_buffers()
110 		schedule_delayed_work_on(i, &b->work, DEFAULT_TIMER_EXPIRE + i);  in start_cpu_work()
126 		/* these works are per-cpu, no need for flush_sync */  in flush_cpu_work()
127 		flush_delayed_work(&b->work);  in flush_cpu_work()
132  * This function prepares the cpu buffer to write a sample.
146 	entry->event = ring_buffer_lock_reserve  in op_cpu_buffer_write_reserve()
148 		 size * sizeof(entry->sample->data[0]));  in op_cpu_buffer_write_reserve()
149 	if (!entry->event)  in op_cpu_buffer_write_reserve()
151 	entry->sample = ring_buffer_event_data(entry->event);  in op_cpu_buffer_write_reserve()
152 	entry->size = size;  in op_cpu_buffer_write_reserve()
153 	entry->data = entry->sample->data;  in op_cpu_buffer_write_reserve()
155 	return entry->sample;  in op_cpu_buffer_write_reserve()
160 	return ring_buffer_unlock_commit(op_ring_buffer, entry->event);  in op_cpu_buffer_write_commit()
170 	entry->event = e;  in op_cpu_buffer_read_entry()
171 	entry->sample = ring_buffer_event_data(e);  in op_cpu_buffer_read_entry()
172 	entry->size = (ring_buffer_event_length(e) - sizeof(struct op_sample))  in op_cpu_buffer_read_entry()
173 		/ sizeof(entry->sample->data[0]);  in op_cpu_buffer_read_entry()
174 	entry->data = entry->sample->data;  in op_cpu_buffer_read_entry()
175 	return entry->sample;  in op_cpu_buffer_read_entry()
197 	/* notice a switch from user->kernel or vice versa */  in op_add_code()
199 	if (cpu_buf->last_is_kernel != is_kernel) {  in op_add_code()
200 		cpu_buf->last_is_kernel = is_kernel;  in op_add_code()
207 	if (cpu_buf->last_task != task) {  in op_add_code()
208 		cpu_buf->last_task = task;  in op_add_code()
223 		return -ENOMEM;  in op_add_code()
225 	sample->eip = ESCAPE_CODE;  in op_add_code()
226 	sample->event = flags;  in op_add_code()
238 	      unsigned long pc, unsigned long event)  in op_add_sample()  argument
245 		return -ENOMEM;  in op_add_sample()
247 	sample->eip = pc;  in op_add_sample()
248 	sample->event = event;  in op_add_sample()
258  * pc. We tag this in the buffer by generating kernel enter/exit
262 log_sample(struct oprofile_cpu_buffer *cpu_buf, unsigned long pc,  in log_sample()  argument
267 	cpu_buf->sample_received++;  in log_sample()
269 	if (pc == ESCAPE_CODE) {  in log_sample()
270 		cpu_buf->sample_invalid_eip++;  in log_sample()
277 	if (op_add_sample(cpu_buf, pc, event))  in log_sample()
283 	cpu_buf->sample_lost_overflow++;  in log_sample()
289 	cpu_buf->tracing = 1;  in oprofile_begin_trace()
294 	cpu_buf->tracing = 0;  in oprofile_end_trace()
298 __oprofile_add_ext_sample(unsigned long pc, struct pt_regs * const regs,  in __oprofile_add_ext_sample()  argument
309 	if (!log_sample(cpu_buf, pc, backtrace, is_kernel, event, task))  in __oprofile_add_ext_sample()
321 void oprofile_add_ext_hw_sample(unsigned long pc, struct pt_regs * const regs,  in oprofile_add_ext_hw_sample()  argument
325 	__oprofile_add_ext_sample(pc, regs, event, is_kernel, task);  in oprofile_add_ext_hw_sample()
328 void oprofile_add_ext_sample(unsigned long pc, struct pt_regs * const regs,  in oprofile_add_ext_sample()  argument
331 	__oprofile_add_ext_sample(pc, regs, event, is_kernel, NULL);  in oprofile_add_ext_sample()
337 	unsigned long pc;  in oprofile_add_sample()  local
341 		pc = profile_pc(regs);  in oprofile_add_sample()
344 		pc = ESCAPE_CODE; /* as this causes an early return. */  in oprofile_add_sample()
347 	__oprofile_add_ext_sample(pc, regs, event, is_kernel, NULL);  in oprofile_add_sample()
358 		       unsigned long pc, int code, int size)  in oprofile_write_reserve()  argument
364 	cpu_buf->sample_received++;  in oprofile_write_reserve()
366 	/* no backtraces for samples with data */  in oprofile_write_reserve()
373 	sample->eip = ESCAPE_CODE;  in oprofile_write_reserve()
374 	sample->event = 0;		/* no flags */  in oprofile_write_reserve()
377 	op_cpu_buffer_add_data(entry, pc);  in oprofile_write_reserve()
382 	entry->event = NULL;  in oprofile_write_reserve()
383 	cpu_buf->sample_lost_overflow++;  in oprofile_write_reserve()
388 	if (!entry->event)  in oprofile_add_data()
395 	if (!entry->event)  in oprofile_add_data64()
410 	if (!entry->event)  in oprofile_write_commit()
411 		return -EINVAL;  in oprofile_write_commit()
415 void oprofile_add_pc(unsigned long pc, int is_kernel, unsigned long event)  in oprofile_add_pc()  argument
418 	log_sample(cpu_buf, pc, 0, is_kernel, event, NULL);  in oprofile_add_pc()
421 void oprofile_add_trace(unsigned long pc)  in oprofile_add_trace()  argument
425 	if (!cpu_buf->tracing)  in oprofile_add_trace()
432 	if (pc == ESCAPE_CODE)  in oprofile_add_trace()
435 	if (op_add_sample(cpu_buf, pc, 0))  in oprofile_add_trace()
440 	cpu_buf->tracing = 0;  in oprofile_add_trace()
441 	cpu_buf->backtrace_aborted++;  in oprofile_add_trace()
456 	if (b->cpu != smp_processor_id() && !cpu_online(b->cpu)) {  in wq_sync_buffer()
457 		cancel_delayed_work(&b->work);  in wq_sync_buffer()
460 	sync_buffer(b->cpu);  in wq_sync_buffer()
462 	/* don't re-add the work if we're shutting down */  in wq_sync_buffer()
464 		schedule_delayed_work(&b->work, DEFAULT_TIMER_EXPIRE);  in wq_sync_buffer()