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Commit 097d036a authored by Frederic Weisbecker's avatar Frederic Weisbecker Committed by Ingo Molnar
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tracing/fastboot: only trace non-module initcalls 



At this time, only built-in initcalls interest us.
We can't really produce a relevant graph if we include
the modules initcall too.

I had good results after this patch (see svg in attachment).

Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 6450c1d3

include/linux/ftrace.h

+2 −0
Original line number Original line Diff line number Diff line
@@ -225,9 +225,11 @@ struct boot_trace { 
#ifdef CONFIG_BOOT_TRACER

#ifdef CONFIG_BOOT_TRACER

extern void trace_boot(struct boot_trace *it, initcall_t fn);

extern void trace_boot(struct boot_trace *it, initcall_t fn);

extern void start_boot_trace(void);

extern void start_boot_trace(void);

extern void stop_boot_trace(void);

#else

#else

static inline void trace_boot(struct boot_trace *it, initcall_t fn) { }

static inline void trace_boot(struct boot_trace *it, initcall_t fn) { }

static inline void start_boot_trace(void) { }

static inline void start_boot_trace(void) { }

static inline void stop_boot_trace(void) { }

#endif

#endif

init/main.c

+1 −0
Original line number Original line Diff line number Diff line
@@ -886,6 +886,7 @@ static int __init kernel_init(void * unused) 
	 * we're essentially up and running. Get rid of the

	 * we're essentially up and running. Get rid of the

	 * initmem segments and start the user-mode stuff..

	 * initmem segments and start the user-mode stuff..

	 */

	 */

	stop_boot_trace();

	init_post();

	init_post();

	return 0;

	return 0;

}
 
}

kernel/trace/trace_boot.c

+8 −3
Original line number Original line Diff line number Diff line
@@ -22,11 +22,16 @@ void start_boot_trace(void) 
	trace_boot_enabled = 1;

	trace_boot_enabled = 1;

}

}





void stop_boot_trace(struct trace_array *tr)

void stop_boot_trace(void)

{

{

	trace_boot_enabled = 0;

	trace_boot_enabled = 0;

}

}





void reset_boot_trace(struct trace_array *tr)

{

	stop_boot_trace();

}



static void boot_trace_init(struct trace_array *tr)

static void boot_trace_init(struct trace_array *tr)

{

{

	int cpu;

	int cpu;
@@ -43,7 +48,7 @@ static void boot_trace_ctrl_update(struct trace_array *tr) 
	if (tr->ctrl)

	if (tr->ctrl)

		start_boot_trace();

		start_boot_trace();

	else

	else

		stop_boot_trace(tr);

		stop_boot_trace();

}

}





static enum print_line_t initcall_print_line(struct trace_iterator *iter)

static enum print_line_t initcall_print_line(struct trace_iterator *iter)
@@ -81,7 +86,7 @@ struct tracer boot_tracer __read_mostly = 
{

{

	.name		= "initcall",

	.name		= "initcall",

	.init		= boot_trace_init,

	.init		= boot_trace_init,

	.reset		= stop_boot_trace,

	.reset		= reset_boot_trace,

	.ctrl_update	= boot_trace_ctrl_update,

	.ctrl_update	= boot_trace_ctrl_update,

	.print_line	= initcall_print_line,

	.print_line	= initcall_print_line,

};

};