tracing/ftrace: give an entry on the config for boot tracer
Bring the entry to choose the boot tracer on the kernel config.
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index 254328d..81a17ef 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -116,6 +116,18 @@
This tracer gets called from the context switch and records
all switching of tasks.
+config BOOT_TRACER
+ bool "Trace boot initcalls"
+ depends on HAVE_FTRACE
+ depends on DEBUG_KERNEL
+ select TRACING
+ help
+ This tracer helps developers to optimize boot times: it records
+ the timings of the initcalls. Its aim is to be parsed by the
+ /scripts/bootgraph.pl tool to produce pretty graphics about
+ boot inefficiencies, giving a visual representation of the
+ delays during initcalls.
+
config STACK_TRACER
bool "Trace max stack"
depends on HAVE_FTRACE
diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile
index 73ba13f..35a07f7 100644
--- a/kernel/trace/Makefile
+++ b/kernel/trace/Makefile
@@ -22,5 +22,6 @@
obj-$(CONFIG_NOP_TRACER) += trace_nop.o
obj-$(CONFIG_STACK_TRACER) += trace_stack.o
obj-$(CONFIG_MMIOTRACE) += trace_mmiotrace.o
+obj-$(CONFIG_BOOT_TRACER) += trace_boot.o
libftrace-y := ftrace.o
