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tracing/fastboot: only trace non-module initcalls

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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: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Frederic Weisbecker 2008-10-03 15:39:21 +02:00 • committed by Ingo Molnar
parent 6450c1d321
commit 097d036a2f
3 changed files with 11 additions and 3 deletions
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2
include/linux/ftrace.h
View file

@ -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

1
init/main.c
View file

@ -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;
} }

11
kernel/trace/trace_boot.c
View file

@ -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,
}; };