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tracing/ftrace: add the boot tracer

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Add the boot/initcall tracer.

It's primary purpose is to be able to trace the initcalls.

It is intended to be used with scripts/bootgraph.pl after some small
improvements.

Note that it is not active after its init. To avoid tracing (and so
crashing) before the whole tracing engine init, you have to explicitly
call start_boot_trace() after do_pre_smp_initcalls() to enable it.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Frédéric Weisbecker 2008-09-23 11:32:08 +01:00 • committed by Ingo Molnar
parent aa5d9151f7
commit d13744cd6e
3 changed files with 124 additions and 0 deletions
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19
include/linux/ftrace.h
View file

@ -5,6 +5,8 @@
#include <linux/linkage.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/types.h>
extern int ftrace_enabled;
extern int
@ -209,4 +211,21 @@ ftrace_init_module(unsigned long *start, unsigned long *end) { }
#endif
struct boot_trace {
pid_t caller;
initcall_t func;
int result;
unsigned long long duration;
};
#ifdef CONFIG_BOOT_TRACER
extern void trace_boot(struct boot_trace *it);
extern void start_boot_trace(void);
#else
static inline void trace_boot(struct boot_trace *it) { }
static inline void start_boot_trace(void) { }
#endif
#endif /* _LINUX_FTRACE_H */