tracing/fastboot: improve help text

Improve the help text of the boot tracer.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 11 insertions, 6 deletions

diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index 11fd03a429f0..1cb3e1f616af 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -127,12 +127,17 @@ config BOOT_TRACER
         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. Note that tracers self tests can't
-          be enabled if this tracer is selected since only one tracer
-          should touch the tracing buffer at a time.
+          the timings of the initcalls and traces key events and the identity
+          of tasks that can cause boot delays, such as context-switches.
+
+          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 - but the raw
+          /debug/tracing/trace text output is readable too.
+
+          ( Note that tracing self tests can't be enabled if this tracer is
+            selected, because the self-tests are an initcall as well and that
+            would invalidate the boot trace. )
 
 config STACK_TRACER
         bool "Trace max stack"