[PATCH 15/15] tracing: Add config option for kexec handover
From: Alexander Graf <graf@amazon.com>
Date: 2023-12-13 00:08:38
Also in:
kexec, linux-arm-kernel, linux-devicetree, linux-doc, linux-mm, lkml
Subsystem:
the rest, tracing · Maintainers:
Linus Torvalds, Steven Rostedt, Masami Hiramatsu
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
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