Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit f0a920d5 authored by Ingo Molnar's avatar Ingo Molnar Committed by Thomas Gleixner
Browse files

ftrace: add trace_special() 



for ad-hoc tracing.

Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent cb0f12aa

kernel/trace/trace.c

+44 −0
Original line number Diff line number Diff line
@@ -137,6 +137,7 @@ enum trace_type { 


	TRACE_FN,

	TRACE_CTX,

	TRACE_SPECIAL,



	__TRACE_LAST_TYPE

};
@@ -700,6 +701,22 @@ ftrace(struct trace_array *tr, struct trace_array_cpu *data, 
	spin_unlock(&data->lock);

}



notrace void

trace_special(struct trace_array *tr, struct trace_array_cpu *data,

	      unsigned long arg1, unsigned long arg2, unsigned long arg3)

{

	struct trace_entry *entry;



	spin_lock(&data->lock);

	entry			= tracing_get_trace_entry(tr, data);

	tracing_generic_entry_update(entry, 0);

	entry->type		= TRACE_SPECIAL;

	entry->special.arg1	= arg1;

	entry->special.arg2	= arg2;

	entry->special.arg3	= arg3;

	spin_unlock(&data->lock);

}



notrace void

tracing_sched_switch_trace(struct trace_array *tr,

			   struct trace_array_cpu *data,
@@ -1167,6 +1184,12 @@ print_lat_fmt(struct trace_iterator *iter, unsigned int trace_idx, int cpu) 
				 entry->ctx.next_prio,

				 comm);

		break;

	case TRACE_SPECIAL:

		trace_seq_printf(s, " %lx %lx %lx\n",

				 entry->special.arg1,

				 entry->special.arg2,

				 entry->special.arg3);

		break;

	default:

		trace_seq_printf(s, "Unknown type %d\n", entry->type);

	}
@@ -1234,6 +1257,14 @@ static notrace int print_trace_fmt(struct trace_iterator *iter) 
		if (!ret)

			return 0;

		break;

	case TRACE_SPECIAL:

		ret = trace_seq_printf(s, " %lx %lx %lx\n",

				 entry->special.arg1,

				 entry->special.arg2,

				 entry->special.arg3);

		if (!ret)

			return 0;

		break;

	}

	return 1;

}
@@ -1271,6 +1302,14 @@ static notrace int print_raw_fmt(struct trace_iterator *iter) 
		if (!ret)

			return 0;

		break;

	case TRACE_SPECIAL:

		ret = trace_seq_printf(s, " %lx %lx %lx\n",

				 entry->special.arg1,

				 entry->special.arg2,

				 entry->special.arg3);

		if (!ret)

			return 0;

		break;

	}

	return 1;

}
@@ -1304,6 +1343,11 @@ static notrace int print_bin_fmt(struct trace_iterator *iter) 
		SEQ_PUT_FIELD_RET(s, entry->ctx.next_pid);

		SEQ_PUT_FIELD_RET(s, entry->ctx.next_prio);

		break;

	case TRACE_SPECIAL:

		SEQ_PUT_FIELD_RET(s, entry->special.arg1);

		SEQ_PUT_FIELD_RET(s, entry->special.arg2);

		SEQ_PUT_FIELD_RET(s, entry->special.arg3);

		break;

	}

	return 1;

}

kernel/trace/trace.h

+15 −0
Original line number Diff line number Diff line
@@ -25,6 +25,15 @@ struct ctx_switch_entry { 
	unsigned char		next_prio;

};



/*

 * Special (free-form) trace entry:

 */

struct special_entry {

	unsigned long		arg1;

	unsigned long		arg2;

	unsigned long		arg3;

};



/*

 * The trace entry - the most basic unit of tracing. This is what

 * is printed in the end as a single line in the trace output, such as:
@@ -41,6 +50,7 @@ struct trace_entry { 
	union {

		struct ftrace_entry		fn;

		struct ctx_switch_entry		ctx;

		struct special_entry		special;

	};

};
@@ -154,6 +164,11 @@ void tracing_sched_switch_trace(struct trace_array *tr, 
				struct task_struct *next,

				unsigned long flags);

void tracing_record_cmdline(struct task_struct *tsk);

void trace_special(struct trace_array *tr,

		   struct trace_array_cpu *data,

		   unsigned long arg1,

		   unsigned long arg2,

		   unsigned long arg3);



void tracing_start_function_trace(void);

void tracing_stop_function_trace(void);