ftrace: take advantage of variable length entries

Now that the underlining ring buffer for ftrace now hold variable length
entries, we can take advantage of this by only storing the size of the
actual event into the buffer. This happens to increase the number of
entries in the buffer dramatically.

We can also get rid of the "trace_cont" operation, but I'm keeping that
until we have no more users. Some of the ftrace tracers can now change
their code to adapt to this new feature.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 235 insertions, 204 deletions

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index ef80793858b8..ed9e47c18810 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -637,9 +637,9 @@ tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags)
 
 	pc = preempt_count();
 
-	entry->field.preempt_count	= pc & 0xff;
-	entry->field.pid		= (tsk) ? tsk->pid : 0;
-	entry->field.flags =
+	entry->preempt_count		= pc & 0xff;
+	entry->pid			= (tsk) ? tsk->pid : 0;
+	entry->flags =
 		(irqs_disabled_flags(flags) ? TRACE_FLAG_IRQS_OFF : 0) |
 		((pc & HARDIRQ_MASK) ? TRACE_FLAG_HARDIRQ : 0) |
 		((pc & SOFTIRQ_MASK) ? TRACE_FLAG_SOFTIRQ : 0) |
@@ -651,7 +651,7 @@ trace_function(struct trace_array *tr, struct trace_array_cpu *data,
 	       unsigned long ip, unsigned long parent_ip, unsigned long flags)
 {
 	struct ring_buffer_event *event;
-	struct trace_entry *entry;
+	struct ftrace_entry *entry;
 	unsigned long irq_flags;
 
 	event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
@@ -659,10 +659,10 @@ trace_function(struct trace_array *tr, struct trace_array_cpu *data,
 	if (!event)
 		return;
 	entry	= ring_buffer_event_data(event);
-	tracing_generic_entry_update(entry, flags);
-	entry->type			= TRACE_FN;
-	entry->field.fn.ip		= ip;
-	entry->field.fn.parent_ip	= parent_ip;
+	tracing_generic_entry_update(&entry->ent, flags);
+	entry->ent.type			= TRACE_FN;
+	entry->ip			= ip;
+	entry->parent_ip		= parent_ip;
 	ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
 }
 
@@ -680,7 +680,7 @@ void __trace_stack(struct trace_array *tr,
 		   int skip)
 {
 	struct ring_buffer_event *event;
-	struct trace_entry *entry;
+	struct stack_entry *entry;
 	struct stack_trace trace;
 	unsigned long irq_flags;
 
@@ -692,15 +692,15 @@ void __trace_stack(struct trace_array *tr,
 	if (!event)
 		return;
 	entry	= ring_buffer_event_data(event);
-	tracing_generic_entry_update(entry, flags);
-	entry->type		= TRACE_STACK;
+	tracing_generic_entry_update(&entry->ent, flags);
+	entry->ent.type		= TRACE_STACK;
 
-	memset(&entry->field.stack, 0, sizeof(entry->field.stack));
+	memset(&entry->caller, 0, sizeof(entry->caller));
 
 	trace.nr_entries	= 0;
 	trace.max_entries	= FTRACE_STACK_ENTRIES;
 	trace.skip		= skip;
-	trace.entries		= entry->field.stack.caller;
+	trace.entries		= entry->caller;
 
 	save_stack_trace(&trace);
 	ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
@@ -713,7 +713,7 @@ __trace_special(void *__tr, void *__data,
 	struct ring_buffer_event *event;
 	struct trace_array_cpu *data = __data;
 	struct trace_array *tr = __tr;
-	struct trace_entry *entry;
+	struct special_entry *entry;
 	unsigned long irq_flags;
 
 	event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
@@ -721,11 +721,11 @@ __trace_special(void *__tr, void *__data,
 	if (!event)
 		return;
 	entry	= ring_buffer_event_data(event);
-	tracing_generic_entry_update(entry, 0);
-	entry->type			= TRACE_SPECIAL;
-	entry->field.special.arg1	= arg1;
-	entry->field.special.arg2	= arg2;
-	entry->field.special.arg3	= arg3;
+	tracing_generic_entry_update(&entry->ent, 0);
+	entry->ent.type			= TRACE_SPECIAL;
+	entry->arg1			= arg1;
+	entry->arg2			= arg2;
+	entry->arg3			= arg3;
 	ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
 	__trace_stack(tr, data, irq_flags, 4);
 
@@ -740,7 +740,7 @@ tracing_sched_switch_trace(struct trace_array *tr,
 			   unsigned long flags)
 {
 	struct ring_buffer_event *event;
-	struct trace_entry *entry;
+	struct ctx_switch_entry *entry;
 	unsigned long irq_flags;
 
 	event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
@@ -748,15 +748,15 @@ tracing_sched_switch_trace(struct trace_array *tr,
 	if (!event)
 		return;
 	entry	= ring_buffer_event_data(event);
-	tracing_generic_entry_update(entry, flags);
-	entry->type			= TRACE_CTX;
-	entry->field.ctx.prev_pid	= prev->pid;
-	entry->field.ctx.prev_prio	= prev->prio;
-	entry->field.ctx.prev_state	= prev->state;
-	entry->field.ctx.next_pid	= next->pid;
-	entry->field.ctx.next_prio	= next->prio;
-	entry->field.ctx.next_state	= next->state;
-	entry->field.ctx.next_cpu	= task_cpu(next);
+	tracing_generic_entry_update(&entry->ent, flags);
+	entry->ent.type			= TRACE_CTX;
+	entry->prev_pid			= prev->pid;
+	entry->prev_prio		= prev->prio;
+	entry->prev_state		= prev->state;
+	entry->next_pid			= next->pid;
+	entry->next_prio		= next->prio;
+	entry->next_state		= next->state;
+	entry->next_cpu	= task_cpu(next);
 	ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
 	__trace_stack(tr, data, flags, 5);
 }
@@ -769,7 +769,7 @@ tracing_sched_wakeup_trace(struct trace_array *tr,
 			   unsigned long flags)
 {
 	struct ring_buffer_event *event;
-	struct trace_entry *entry;
+	struct ctx_switch_entry *entry;
 	unsigned long irq_flags;
 
 	event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
@@ -777,15 +777,15 @@ tracing_sched_wakeup_trace(struct trace_array *tr,
 	if (!event)
 		return;
 	entry	= ring_buffer_event_data(event);
-	tracing_generic_entry_update(entry, flags);
-	entry->type		= TRACE_WAKE;
-	entry->field.ctx.prev_pid	= curr->pid;
-	entry->field.ctx.prev_prio	= curr->prio;
-	entry->field.ctx.prev_state	= curr->state;
-	entry->field.ctx.next_pid	= wakee->pid;
-	entry->field.ctx.next_prio	= wakee->prio;
-	entry->field.ctx.next_state	= wakee->state;
-	entry->field.ctx.next_cpu	= task_cpu(wakee);
+	tracing_generic_entry_update(&entry->ent, flags);
+	entry->ent.type			= TRACE_WAKE;
+	entry->prev_pid			= curr->pid;
+	entry->prev_prio		= curr->prio;
+	entry->prev_state		= curr->state;
+	entry->next_pid			= wakee->pid;
+	entry->next_prio		= wakee->prio;
+	entry->next_state		= wakee->state;
+	entry->next_cpu			= task_cpu(wakee);
 	ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
 	__trace_stack(tr, data, flags, 6);
 
@@ -1173,20 +1173,19 @@ print_trace_header(struct seq_file *m, struct trace_iterator *iter)
 static void
 lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
 {
-	struct trace_field *field = &entry->field;
 	int hardirq, softirq;
 	char *comm;
 
-	comm = trace_find_cmdline(field->pid);
+	comm = trace_find_cmdline(entry->pid);
 
-	trace_seq_printf(s, "%8.8s-%-5d ", comm, field->pid);
+	trace_seq_printf(s, "%8.8s-%-5d ", comm, entry->pid);
 	trace_seq_printf(s, "%3d", cpu);
 	trace_seq_printf(s, "%c%c",
-			(field->flags & TRACE_FLAG_IRQS_OFF) ? 'd' : '.',
-			((field->flags & TRACE_FLAG_NEED_RESCHED) ? 'N' : '.'));
+			(entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' : '.',
+			((entry->flags & TRACE_FLAG_NEED_RESCHED) ? 'N' : '.'));
 
-	hardirq = field->flags & TRACE_FLAG_HARDIRQ;
-	softirq = field->flags & TRACE_FLAG_SOFTIRQ;
+	hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
+	softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
 	if (hardirq && softirq) {
 		trace_seq_putc(s, 'H');
 	} else {
@@ -1200,8 +1199,8 @@ lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
 		}
 	}
 
-	if (field->preempt_count)
-		trace_seq_printf(s, "%x", field->preempt_count);
+	if (entry->preempt_count)
+		trace_seq_printf(s, "%x", entry->preempt_count);
 	else
 		trace_seq_puts(s, ".");
 }
@@ -1230,6 +1229,7 @@ static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
 void trace_seq_print_cont(struct trace_seq *s, struct trace_iterator *iter)
 {
 	struct trace_entry *ent;
+	struct trace_field_cont *cont;
 	bool ok = true;
 
 	ent = peek_next_entry(iter, iter->cpu, NULL);
@@ -1239,8 +1239,9 @@ void trace_seq_print_cont(struct trace_seq *s, struct trace_iterator *iter)
 	}
 
 	do {
+		cont = (struct trace_field_cont *)ent;
 		if (ok)
-			ok = (trace_seq_printf(s, "%s", ent->cont.buf) > 0);
+			ok = (trace_seq_printf(s, "%s", cont->buf) > 0);
 		ring_buffer_read(iter->buffer_iter[iter->cpu], NULL);
 		ent = peek_next_entry(iter, iter->cpu, NULL);
 	} while (ent && ent->type == TRACE_CONT);
@@ -1257,7 +1258,6 @@ print_lat_fmt(struct trace_iterator *iter, unsigned int trace_idx, int cpu)
 	struct trace_entry *next_entry;
 	unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE);
 	struct trace_entry *entry = iter->ent;
-	struct trace_field *field = &entry->field;
 	unsigned long abs_usecs;
 	unsigned long rel_usecs;
 	u64 next_ts;
@@ -1276,12 +1276,12 @@ print_lat_fmt(struct trace_iterator *iter, unsigned int trace_idx, int cpu)
 	abs_usecs = ns2usecs(iter->ts - iter->tr->time_start);
 
 	if (verbose) {
-		comm = trace_find_cmdline(field->pid);
+		comm = trace_find_cmdline(entry->pid);
 		trace_seq_printf(s, "%16s %5d %3d %d %08x %08x [%08lx]"
 				 " %ld.%03ldms (+%ld.%03ldms): ",
 				 comm,
-				 field->pid, cpu, field->flags,
-				 field->preempt_count, trace_idx,
+				 entry->pid, cpu, entry->flags,
+				 entry->preempt_count, trace_idx,
 				 ns2usecs(iter->ts),
 				 abs_usecs/1000,
 				 abs_usecs % 1000, rel_usecs/1000,
@@ -1291,53 +1291,69 @@ print_lat_fmt(struct trace_iterator *iter, unsigned int trace_idx, int cpu)
 		lat_print_timestamp(s, abs_usecs, rel_usecs);
 	}
 	switch (entry->type) {
-	case TRACE_FN:
-		seq_print_ip_sym(s, field->fn.ip, sym_flags);
+	case TRACE_FN: {
+		struct ftrace_entry *field = (struct ftrace_entry *)entry;
+
+		seq_print_ip_sym(s, field->ip, sym_flags);
 		trace_seq_puts(s, " (");
-		if (kretprobed(field->fn.parent_ip))
+		if (kretprobed(field->parent_ip))
 			trace_seq_puts(s, KRETPROBE_MSG);
 		else
-			seq_print_ip_sym(s, field->fn.parent_ip, sym_flags);
+			seq_print_ip_sym(s, field->parent_ip, sym_flags);
 		trace_seq_puts(s, ")\n");
 		break;
+	}
 	case TRACE_CTX:
-	case TRACE_WAKE:
-		T = field->ctx.next_state < sizeof(state_to_char) ?
-			state_to_char[field->ctx.next_state] : 'X';
+	case TRACE_WAKE: {
+		struct ctx_switch_entry *field =
+			(struct ctx_switch_entry *)entry;
+
+		T = field->next_state < sizeof(state_to_char) ?
+			state_to_char[field->next_state] : 'X';
 
-		state = field->ctx.prev_state ?
-			__ffs(field->ctx.prev_state) + 1 : 0;
+		state = field->prev_state ?
+			__ffs(field->prev_state) + 1 : 0;
 		S = state < sizeof(state_to_char) - 1 ? state_to_char[state] : 'X';
-		comm = trace_find_cmdline(field->ctx.next_pid);
+		comm = trace_find_cmdline(field->next_pid);
 		trace_seq_printf(s, " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
-				 field->ctx.prev_pid,
-				 field->ctx.prev_prio,
+				 field->prev_pid,
+				 field->prev_prio,
 				 S, entry->type == TRACE_CTX ? "==>" : "  +",
-				 field->ctx.next_cpu,
-				 field->ctx.next_pid,
-				 field->ctx.next_prio,
+				 field->next_cpu,
+				 field->next_pid,
+				 field->next_prio,
 				 T, comm);
 		break;
-	case TRACE_SPECIAL:
+	}
+	case TRACE_SPECIAL: {
+		struct special_entry *field = (struct special_entry *)entry;
+
 		trace_seq_printf(s, "# %ld %ld %ld\n",
-				 field->special.arg1,
-				 field->special.arg2,
-				 field->special.arg3);
+				 field->arg1,
+				 field->arg2,
+				 field->arg3);
 		break;
-	case TRACE_STACK:
+	}
+	case TRACE_STACK: {
+		struct stack_entry *field = (struct stack_entry *)entry;
+
 		for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
 			if (i)
 				trace_seq_puts(s, " <= ");
-			seq_print_ip_sym(s, field->stack.caller[i], sym_flags);
+			seq_print_ip_sym(s, field->caller[i], sym_flags);
 		}
 		trace_seq_puts(s, "\n");
 		break;
-	case TRACE_PRINT:
-		seq_print_ip_sym(s, field->print.ip, sym_flags);
-		trace_seq_printf(s, ": %s", field->print.buf);
-		if (field->flags & TRACE_FLAG_CONT)
+	}
+	case TRACE_PRINT: {
+		struct print_entry *field = (struct print_entry *)entry;
+
+		seq_print_ip_sym(s, field->ip, sym_flags);
+		trace_seq_printf(s, ": %s", field->buf);
+		if (entry->flags & TRACE_FLAG_CONT)
 			trace_seq_print_cont(s, iter);
 		break;
+	}
 	default:
 		trace_seq_printf(s, "Unknown type %d\n", entry->type);
 	}
@@ -1349,7 +1365,6 @@ static int print_trace_fmt(struct trace_iterator *iter)
 	struct trace_seq *s = &iter->seq;
 	unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK);
 	struct trace_entry *entry;
-	struct trace_field *field;
 	unsigned long usec_rem;
 	unsigned long long t;
 	unsigned long secs;
@@ -1363,15 +1378,13 @@ static int print_trace_fmt(struct trace_iterator *iter)
 	if (entry->type == TRACE_CONT)
 		return 1;
 
-	field = &entry->field;
-
-	comm = trace_find_cmdline(iter->ent->field.pid);
+	comm = trace_find_cmdline(iter->ent->pid);
 
 	t = ns2usecs(iter->ts);
 	usec_rem = do_div(t, 1000000ULL);
 	secs = (unsigned long)t;
 
-	ret = trace_seq_printf(s, "%16s-%-5d ", comm, field->pid);
+	ret = trace_seq_printf(s, "%16s-%-5d ", comm, entry->pid);
 	if (!ret)
 		return 0;
 	ret = trace_seq_printf(s, "[%03d] ", iter->cpu);
@@ -1382,20 +1395,22 @@ static int print_trace_fmt(struct trace_iterator *iter)
 		return 0;
 
 	switch (entry->type) {
-	case TRACE_FN:
-		ret = seq_print_ip_sym(s, field->fn.ip, sym_flags);
+	case TRACE_FN: {
+		struct ftrace_entry *field = (struct ftrace_entry *)entry;
+
+		ret = seq_print_ip_sym(s, field->ip, sym_flags);
 		if (!ret)
 			return 0;
 		if ((sym_flags & TRACE_ITER_PRINT_PARENT) &&
-						field->fn.parent_ip) {
+						field->parent_ip) {
 			ret = trace_seq_printf(s, " <-");
 			if (!ret)
 				return 0;
-			if (kretprobed(field->fn.parent_ip))
+			if (kretprobed(field->parent_ip))
 				ret = trace_seq_puts(s, KRETPROBE_MSG);
 			else
 				ret = seq_print_ip_sym(s,
-						       field->fn.parent_ip,
+						       field->parent_ip,
 						       sym_flags);
 			if (!ret)
 				return 0;
@@ -1404,40 +1419,50 @@ static int print_trace_fmt(struct trace_iterator *iter)
 		if (!ret)
 			return 0;
 		break;
+	}
 	case TRACE_CTX:
-	case TRACE_WAKE:
-		S = field->ctx.prev_state < sizeof(state_to_char) ?
-			state_to_char[field->ctx.prev_state] : 'X';
-		T = field->ctx.next_state < sizeof(state_to_char) ?
-			state_to_char[field->ctx.next_state] : 'X';
+	case TRACE_WAKE: {
+		struct ctx_switch_entry *field =
+			(struct ctx_switch_entry *)entry;
+
+		S = field->prev_state < sizeof(state_to_char) ?
+			state_to_char[field->prev_state] : 'X';
+		T = field->next_state < sizeof(state_to_char) ?
+			state_to_char[field->next_state] : 'X';
 		ret = trace_seq_printf(s, " %5d:%3d:%c %s [%03d] %5d:%3d:%c\n",
-				       field->ctx.prev_pid,
-				       field->ctx.prev_prio,
+				       field->prev_pid,
+				       field->prev_prio,
 				       S,
 				       entry->type == TRACE_CTX ? "==>" : "  +",
-				       field->ctx.next_cpu,
-				       field->ctx.next_pid,
-				       field->ctx.next_prio,
+				       field->next_cpu,
+				       field->next_pid,
+				       field->next_prio,
 				       T);
 		if (!ret)
 			return 0;
 		break;
-	case TRACE_SPECIAL:
+	}
+	case TRACE_SPECIAL: {
+		struct special_entry *field = (struct special_entry *)entry;
+
 		ret = trace_seq_printf(s, "# %ld %ld %ld\n",
-				 field->special.arg1,
-				 field->special.arg2,
-				 field->special.arg3);
+				 field->arg1,
+				 field->arg2,
+				 field->arg3);
 		if (!ret)
 			return 0;
 		break;
-	case TRACE_STACK:
+	}
+	case TRACE_STACK: {
+		struct stack_entry *field = (struct stack_entry *)entry;
+
 		for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
 			if (i) {
 				ret = trace_seq_puts(s, " <= ");
 				if (!ret)
 					return 0;
 			}
-			ret = seq_print_ip_sym(s, field->stack.caller[i],
+			ret = seq_print_ip_sym(s, field->caller[i],
 					       sym_flags);
 			if (!ret)
 				return 0;
@@ -1446,13 +1471,17 @@ static int print_trace_fmt(struct trace_iterator *iter)
 		if (!ret)
 			return 0;
 		break;
-	case TRACE_PRINT:
-		seq_print_ip_sym(s, field->print.ip, sym_flags);
-		trace_seq_printf(s, ": %s", field->print.buf);
-		if (field->flags & TRACE_FLAG_CONT)
+	}
+	case TRACE_PRINT: {
+		struct print_entry *field = (struct print_entry *)entry;
+
+		seq_print_ip_sym(s, field->ip, sym_flags);
+		trace_seq_printf(s, ": %s", field->buf);
+		if (entry->flags & TRACE_FLAG_CONT)
 			trace_seq_print_cont(s, iter);
 		break;
 	}
+	}
 	return 1;
 }
 
@@ -1460,7 +1489,6 @@ static int print_raw_fmt(struct trace_iterator *iter)
 {
 	struct trace_seq *s = &iter->seq;
 	struct trace_entry *entry;
-	struct trace_field *field;
 	int ret;
 	int S, T;
 
@@ -1469,56 +1497,66 @@ static int print_raw_fmt(struct trace_iterator *iter)
 	if (entry->type == TRACE_CONT)
 		return 1;
 
-	field = &entry->field;
-
 	ret = trace_seq_printf(s, "%d %d %llu ",
-		field->pid, iter->cpu, iter->ts);
+		entry->pid, iter->cpu, iter->ts);
 	if (!ret)
 		return 0;
 
 	switch (entry->type) {
-	case TRACE_FN:
+	case TRACE_FN: {
+		struct ftrace_entry *field = (struct ftrace_entry *)entry;
+
 		ret = trace_seq_printf(s, "%x %x\n",
-					field->fn.ip,
-					field->fn.parent_ip);
+					field->ip,
+					field->parent_ip);
 		if (!ret)
 			return 0;
 		break;
+	}
 	case TRACE_CTX:
-	case TRACE_WAKE:
-		S = field->ctx.prev_state < sizeof(state_to_char) ?
-			state_to_char[field->ctx.prev_state] : 'X';
-		T = field->ctx.next_state < sizeof(state_to_char) ?
-			state_to_char[field->ctx.next_state] : 'X';
+	case TRACE_WAKE: {
+		struct ctx_switch_entry *field =
+			(struct ctx_switch_entry *)entry;
+
+		S = field->prev_state < sizeof(state_to_char) ?
+			state_to_char[field->prev_state] : 'X';
+		T = field->next_state < sizeof(state_to_char) ?
+			state_to_char[field->next_state] : 'X';
 		if (entry->type == TRACE_WAKE)
 			S = '+';
 		ret = trace_seq_printf(s, "%d %d %c %d %d %d %c\n",
-				       field->ctx.prev_pid,
-				       field->ctx.prev_prio,
+				       field->prev_pid,
+				       field->prev_prio,
 				       S,
-				       field->ctx.next_cpu,
-				       field->ctx.next_pid,
-				       field->ctx.next_prio,
+				       field->next_cpu,
+				       field->next_pid,
+				       field->next_prio,
 				       T);
 		if (!ret)
 			return 0;
 		break;
+	}
 	case TRACE_SPECIAL:
-	case TRACE_STACK:
+	case TRACE_STACK: {
+		struct special_entry *field = (struct special_entry *)entry;
+
 		ret = trace_seq_printf(s, "# %ld %ld %ld\n",
-				 field->special.arg1,
-				 field->special.arg2,
-				 field->special.arg3);
+				 field->arg1,
+				 field->arg2,
+				 field->arg3);
 		if (!ret)
 			return 0;
 		break;
-	case TRACE_PRINT:
-		trace_seq_printf(s, "# %lx %s",
-				 field->print.ip, field->print.buf);
-		if (field->flags & TRACE_FLAG_CONT)
+	}
+	case TRACE_PRINT: {
+		struct print_entry *field = (struct print_entry *)entry;
+
+		trace_seq_printf(s, "# %lx %s", field->ip, field->buf);
+		if (entry->flags & TRACE_FLAG_CONT)
 			trace_seq_print_cont(s, iter);
 		break;
 	}
+	}
 	return 1;
 }
 
@@ -1539,7 +1577,6 @@ static int print_hex_fmt(struct trace_iterator *iter)
 	struct trace_seq *s = &iter->seq;
 	unsigned char newline = '\n';
 	struct trace_entry *entry;
-	struct trace_field *field;
 	int S, T;
 
 	entry = iter->ent;
@@ -1547,40 +1584,48 @@ static int print_hex_fmt(struct trace_iterator *iter)
 	if (entry->type == TRACE_CONT)
 		return 1;
 
-	field = &entry->field;
-
-	SEQ_PUT_HEX_FIELD_RET(s, field->pid);
+	SEQ_PUT_HEX_FIELD_RET(s, entry->pid);
 	SEQ_PUT_HEX_FIELD_RET(s, iter->cpu);
 	SEQ_PUT_HEX_FIELD_RET(s, iter->ts);
 
 	switch (entry->type) {
-	case TRACE_FN:
-		SEQ_PUT_HEX_FIELD_RET(s, field->fn.ip);
-		SEQ_PUT_HEX_FIELD_RET(s, field->fn.parent_ip);
+	case TRACE_FN: {
+		struct ftrace_entry *field = (struct ftrace_entry *)entry;
+
+		SEQ_PUT_HEX_FIELD_RET(s, field->ip);
+		SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip);
 		break;
+	}
 	case TRACE_CTX:
-	case TRACE_WAKE:
-		S = field->ctx.prev_state < sizeof(state_to_char) ?
-			state_to_char[field->ctx.prev_state] : 'X';
-		T = field->ctx.next_state < sizeof(state_to_char) ?
-			state_to_char[field->ctx.next_state] : 'X';
+	case TRACE_WAKE: {
+		struct ctx_switch_entry *field =
+			(struct ctx_switch_entry *)entry;
+
+		S = field->prev_state < sizeof(state_to_char) ?
+			state_to_char[field->prev_state] : 'X';
+		T = field->next_state < sizeof(state_to_char) ?
+			state_to_char[field->next_state] : 'X';
 		if (entry->type == TRACE_WAKE)
 			S = '+';
-		SEQ_PUT_HEX_FIELD_RET(s, field->ctx.prev_pid);
-		SEQ_PUT_HEX_FIELD_RET(s, field->ctx.prev_prio);
+		SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid);
+		SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio);
 		SEQ_PUT_HEX_FIELD_RET(s, S);
-		SEQ_PUT_HEX_FIELD_RET(s, field->ctx.next_cpu);
-		SEQ_PUT_HEX_FIELD_RET(s, field->ctx.next_pid);
-		SEQ_PUT_HEX_FIELD_RET(s, field->ctx.next_prio);
+		SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu);
+		SEQ_PUT_HEX_FIELD_RET(s, field->next_pid);
+		SEQ_PUT_HEX_FIELD_RET(s, field->next_prio);
 		SEQ_PUT_HEX_FIELD_RET(s, T);
 		break;
+	}
 	case TRACE_SPECIAL:
-	case TRACE_STACK:
-		SEQ_PUT_HEX_FIELD_RET(s, field->special.arg1);
-		SEQ_PUT_HEX_FIELD_RET(s, field->special.arg2);
-		SEQ_PUT_HEX_FIELD_RET(s, field->special.arg3);
+	case TRACE_STACK: {
+		struct special_entry *field = (struct special_entry *)entry;
+
+		SEQ_PUT_HEX_FIELD_RET(s, field->arg1);
+		SEQ_PUT_HEX_FIELD_RET(s, field->arg2);
+		SEQ_PUT_HEX_FIELD_RET(s, field->arg3);
 		break;
 	}
+	}
 	SEQ_PUT_FIELD_RET(s, newline);
 
 	return 1;
@@ -1590,39 +1635,46 @@ static int print_bin_fmt(struct trace_iterator *iter)
 {
 	struct trace_seq *s = &iter->seq;
 	struct trace_entry *entry;
-	struct trace_field *field;
 
 	entry = iter->ent;
 
 	if (entry->type == TRACE_CONT)
 		return 1;
 
-	field = &entry->field;
-
-	SEQ_PUT_FIELD_RET(s, field->pid);
-	SEQ_PUT_FIELD_RET(s, field->cpu);
+	SEQ_PUT_FIELD_RET(s, entry->pid);
+	SEQ_PUT_FIELD_RET(s, iter->cpu);
 	SEQ_PUT_FIELD_RET(s, iter->ts);
 
 	switch (entry->type) {
-	case TRACE_FN:
-		SEQ_PUT_FIELD_RET(s, field->fn.ip);
-		SEQ_PUT_FIELD_RET(s, field->fn.parent_ip);
+	case TRACE_FN: {
+		struct ftrace_entry *field = (struct ftrace_entry *)entry;
+
+		SEQ_PUT_FIELD_RET(s, field->ip);
+		SEQ_PUT_FIELD_RET(s, field->parent_ip);
 		break;
-	case TRACE_CTX:
-		SEQ_PUT_FIELD_RET(s, field->ctx.prev_pid);
-		SEQ_PUT_FIELD_RET(s, field->ctx.prev_prio);
-		SEQ_PUT_FIELD_RET(s, field->ctx.prev_state);
-		SEQ_PUT_FIELD_RET(s, field->ctx.next_pid);
-		SEQ_PUT_FIELD_RET(s, field->ctx.next_prio);
-		SEQ_PUT_FIELD_RET(s, field->ctx.next_state);
+	}
+	case TRACE_CTX: {
+		struct ctx_switch_entry *field =
+			(struct ctx_switch_entry *)entry;
+
+		SEQ_PUT_FIELD_RET(s, field->prev_pid);
+		SEQ_PUT_FIELD_RET(s, field->prev_prio);
+		SEQ_PUT_FIELD_RET(s, field->prev_state);
+		SEQ_PUT_FIELD_RET(s, field->next_pid);
+		SEQ_PUT_FIELD_RET(s, field->next_prio);
+		SEQ_PUT_FIELD_RET(s, field->next_state);
 		break;
+	}
 	case TRACE_SPECIAL:
-	case TRACE_STACK:
-		SEQ_PUT_FIELD_RET(s, field->special.arg1);
-		SEQ_PUT_FIELD_RET(s, field->special.arg2);
-		SEQ_PUT_FIELD_RET(s, field->special.arg3);
+	case TRACE_STACK: {
+		struct special_entry *field = (struct special_entry *)entry;
+
+		SEQ_PUT_FIELD_RET(s, field->arg1);
+		SEQ_PUT_FIELD_RET(s, field->arg2);
+		SEQ_PUT_FIELD_RET(s, field->arg3);
 		break;
 	}
+	}
 	return 1;
 }
 
@@ -2818,10 +2870,10 @@ int trace_vprintk(unsigned long ip, const char *fmt, va_list args)
 	struct ring_buffer_event *event;
 	struct trace_array *tr = &global_trace;
 	struct trace_array_cpu *data;
-	struct trace_entry *entry;
+	struct print_entry *entry;
 	unsigned long flags, irq_flags;
 	long disabled;
-	int cpu, len = 0, write, written = 0;
+	int cpu, len = 0, size;
 
 	if (!tr->ctrl || tracing_disabled)
 		return 0;
@@ -2840,40 +2892,19 @@ int trace_vprintk(unsigned long ip, const char *fmt, va_list args)
 	len = min(len, TRACE_BUF_SIZE-1);
 	trace_buf[len] = 0;
 
-	event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
-					 &irq_flags);
+	size = sizeof(*entry) + len + 1;
+	event = ring_buffer_lock_reserve(tr->buffer, size, &irq_flags);
 	if (!event)
 		goto out_unlock;
-	entry	= ring_buffer_event_data(event);
-	tracing_generic_entry_update(entry, flags);
-	entry->type			= TRACE_PRINT;
-	entry->field.print.ip		= ip;
+	entry = ring_buffer_event_data(event);
+	tracing_generic_entry_update(&entry->ent, flags);
+	entry->ent.type			= TRACE_PRINT;
+	entry->ip			= ip;
 
-	write = min(len, (int)(TRACE_PRINT_BUF_SIZE-1));
-
-	memcpy(&entry->field.print.buf, trace_buf, write);
-	entry->field.print.buf[write] = 0;
-	written = write;
+	memcpy(&entry->buf, trace_buf, len);
+	entry->buf[len] = 0;
 	ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
 
-	if (written != len)
-		entry->field.flags |= TRACE_FLAG_CONT;
-
-	while (written != len) {
-		event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
-						 &irq_flags);
-		if (!event)
-			goto out_unlock;
-		entry	= ring_buffer_event_data(event);
-
-		entry->type = TRACE_CONT;
-		write = min(len - written, (int)(TRACE_CONT_BUF_SIZE-1));
-		memcpy(&entry->cont.buf, trace_buf+written, write);
-		entry->cont.buf[write] = 0;
-		written += write;
-		ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
-	}
-
  out_unlock:
 	spin_unlock(&trace_buf_lock);