Messages in this thread Patch in this message | | | From | Alexander Graf <> | Subject | [PATCH 15/15] tracing: Add config option for kexec handover | Date | Wed, 13 Dec 2023 00:04:52 +0000 |
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Now that all bits are in place to allow ftrace to pass its trace data into the next kernel on kexec, let's give users a kconfig option to enable the functionality.
Signed-off-by: Alexander Graf <graf@amazon.com> --- kernel/trace/Kconfig | 13 +++++++++++++ 1 file changed, 13 insertions(+)
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig index 61c541c36596..af83ee755b9e 100644 --- a/kernel/trace/Kconfig +++ b/kernel/trace/Kconfig @@ -1169,6 +1169,19 @@ config HIST_TRIGGERS_DEBUG If unsure, say N. +config FTRACE_KHO + bool "Ftrace Kexec handover support" + depends on KEXEC_KHO + help + Enable support for ftrace to pass metadata across kexec so the new + kernel continues to use the previous kernel's trace buffers. + + This can be useful when debugging kexec performance or correctness + issues: The new kernel can dump the old kernel's trace buffer which + contains all events until reboot. + + If unsure, say N. + source "kernel/trace/rv/Kconfig" endif # FTRACE -- 2.40.1
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