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[PATCH] x86_64: Document backtracer selection options

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Andi Kleen 19 years ago
parent
commit
b783fd925c
1 changed files with 7 additions and 0 deletions
  1. 7 0
      Documentation/x86_64/boot-options.txt

+ 7 - 0
Documentation/x86_64/boot-options.txt

@@ -238,6 +238,13 @@ Debugging
   pagefaulttrace Dump all page faults. Only useful for extreme debugging
   pagefaulttrace Dump all page faults. Only useful for extreme debugging
 		and will create a lot of output.
 		and will create a lot of output.
 
 
+  call_trace=[old|both|newfallback|new]
+		old: use old inexact backtracer
+		new: use new exact dwarf2 unwinder
+ 		both: print entries from both
+		newfallback: use new unwinder but fall back to old if it gets
+			stuck (default)
+
 Misc
 Misc
 
 
   noreplacement  Don't replace instructions with more appropriate ones
   noreplacement  Don't replace instructions with more appropriate ones