tracing/ftrace: add the boot tracer
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>
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index cb2c3fb..b28bf88 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -6,6 +6,7 @@
#include <linux/sched.h>
#include <linux/clocksource.h>
#include <linux/mmiotrace.h>
+#include <linux/ftrace.h>
enum trace_type {
__TRACE_FIRST_TYPE = 0,
@@ -19,6 +20,7 @@
TRACE_SPECIAL,
TRACE_MMIO_RW,
TRACE_MMIO_MAP,
+ TRACE_BOOT,
__TRACE_LAST_TYPE
};
@@ -30,6 +32,7 @@
unsigned long ip;
unsigned long parent_ip;
};
+extern struct tracer boot_tracer;
/*
* Context switch trace entry - which task (and prio) we switched from/to:
@@ -108,6 +111,7 @@
struct print_entry print;
struct mmiotrace_rw mmiorw;
struct mmiotrace_map mmiomap;
+ struct boot_trace initcall;
};
};
