diff options
| author |   Frédéric Weisbecker <fweisbec@gmail.com> | 2008-09-24 10:36:09 +0100 |
|---|---|---|
| committer |   Ingo Molnar <mingo@elte.hu> | 2008-10-14 10:38:51 +0200 |
| commit | 3ce2b9200da8b7170cc7463b7ee4212fad7b291e (patch) | |
| tree | 8e9e05fb3e5282e199ee9953205504a8ded54d02 | |
| parent | tracing/ftrace: launch boot tracing after pre-smp initcalls (diff) | |
| download | linux-dev-3ce2b9200da8b7170cc7463b7ee4212fad7b291e.tar.xz linux-dev-3ce2b9200da8b7170cc7463b7ee4212fad7b291e.zip | |
ftrace/fastboot: disable tracers self-tests when boot tracer is selected
The tracing engine resets the ring buffer and the tracers touch it
too during self-tests. These self-tests happen during tracers registering
and work against boot tracing which is logging initcalls.
We have to disable tracing self-tests if the boot-tracer is selected.
Reported-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
| -rw-r--r-- | kernel/trace/Kconfig | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig index 81a17ef6b942..4feb3c81f94d 100644 --- a/kernel/trace/Kconfig +++ b/kernel/trace/Kconfig @@ -126,7 +126,9 @@ config BOOT_TRACER 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. + 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. config STACK_TRACER bool "Trace max stack" @@ -168,8 +170,7 @@ config FTRACE_SELFTEST config FTRACE_STARTUP_TEST bool "Perform a startup test on ftrace" - depends on TRACING - depends on DEBUG_KERNEL + depends on TRACING && DEBUG_KERNEL && !BOOT_TRACER select FTRACE_SELFTEST help This option performs a series of startup tests on ftrace. On bootup |