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authorIngo Molnar <mingo@elte.hu>2008-10-14 14:27:20 +0200
committerIngo Molnar <mingo@elte.hu>2008-10-14 14:27:20 +0200
commit98d9c66ab07471006fd7910cb16453581c41a3e7 (patch)
tree0f970a85c75df95e4c84ab81d4df88dac7cf016b
parent4519d9e54dcd273975ad0adebad2a08c20428029 (diff)
tracing/fastboot: improve help text
Improve the help text of the boot tracer. Signed-off-by: Ingo Molnar <mingo@elte.hu>
-rw-r--r--kernel/trace/Kconfig17
1 files changed, 11 insertions, 6 deletions
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index 11fd03a429f..1cb3e1f616a 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"