diff mbox series

[15/15] tracing: Add config option for kexec handover

Message ID 20231213000452.88295-16-graf@amazon.com (mailing list archive)
State New, archived
Headers show
Series kexec: Allow preservation of ftrace buffers | expand

Commit Message

Alexander Graf Dec. 13, 2023, 12:04 a.m. UTC 
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 mbox series

Patch

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