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| author | Ingo Molnar <mingo@elte.hu> | 2008-10-14 14:27:20 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-10-14 14:27:20 +0200 |
| commit | 98d9c66ab07471006fd7910cb16453581c41a3e7 (patch) | |
| tree | 0f970a85c75df95e4c84ab81d4df88dac7cf016b | |
| parent | 4519d9e54dcd273975ad0adebad2a08c20428029 (diff) | |
| download | lwn-98d9c66ab07471006fd7910cb16453581c41a3e7.tar.gz lwn-98d9c66ab07471006fd7910cb16453581c41a3e7.zip | |
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/Kconfig | 17 |
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" |