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>

2 files changed, 13 insertions, 0 deletions

diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index 254328dec672..81a17ef6b942 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -116,6 +116,18 @@ config CONTEXT_SWITCH_TRACER
           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 73ba13f5a461..35a07f7cfa86 100644
--- a/kernel/trace/Makefile
+++ b/kernel/trace/Makefile
@@ -22,5 +22,6 @@ obj-$(CONFIG_SCHED_TRACER) += trace_sched_wakeup.o
 obj-$(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