diff options
| author | Masami Hiramatsu <mhiramat@kernel.org> | 2020-01-10 17:06:17 +0100 |
|---|---|---|
| committer | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2020-01-13 19:19:41 +0100 |
| commit | 9c5b9d3d65e485826fb935453f01171b1a337aa8 (patch) | |
| tree | eb09959ae5da9dd231df0bcfd17a6cbd944f727f /kernel/trace/Kconfig | |
| parent | tracing: Add NULL trace-array check in print_synth_event() (diff) | |
| download | linux-9c5b9d3d65e485826fb935453f01171b1a337aa8.tar.xz linux-9c5b9d3d65e485826fb935453f01171b1a337aa8.zip | |
tracing/boot: Add boot-time tracing
Setup tracing options via extra boot config in addition to kernel
command line.
This adds following commands support. These are applied to
the global trace instance.
- ftrace.options = OPT1[,OPT2...]
Enable given ftrace options.
- ftrace.trace_clock = CLOCK
Set given CLOCK to ftrace's trace_clock.
- ftrace.buffer_size = SIZE
Configure ftrace buffer size to SIZE. You can use "KB" or "MB"
for that SIZE.
- ftrace.events = EVENT[, EVENT2...]
Enable given events on boot. You can use a wild card in EVENT.
- ftrace.tracer = TRACER
Set TRACER to current tracer on boot. (e.g. function)
Note that this is NOT replacing the kernel parameters, because
this boot config based setting is later than that. If you want to
trace earlier boot events, you still need kernel parameters.
Link: http://lkml.kernel.org/r/157867237723.17873.17494943526320587488.stgit@devnote2
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/Kconfig')
| -rw-r--r-- | kernel/trace/Kconfig | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig index 25a0fcfa7a5d..75326d8ab1af 100644 --- a/kernel/trace/Kconfig +++ b/kernel/trace/Kconfig @@ -814,6 +814,15 @@ config GCOV_PROFILE_FTRACE Note that on a kernel compiled with this config, ftrace will run significantly slower. +config BOOTTIME_TRACING + bool "Boot-time Tracing support" + depends on BOOT_CONFIG && TRACING + default y + help + Enable developer to setup ftrace subsystem via supplemental + kernel cmdline at boot time for debugging (tracing) driver + initialization and boot process. + endif # FTRACE endif # TRACING_SUPPORT |