Merge master.kernel.org:/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6

[powerpc.git] / arch / powerpc / Kconfig.debug

diff --git a/arch/powerpc/Kconfig.debug b/arch/powerpc/Kconfig.debug
index e29ef77..5ad149b 100644 (file)
--- a/arch/powerpc/Kconfig.debug
+++ b/arch/powerpc/Kconfig.debug
@@ -18,6 +18,20 @@ config DEBUG_STACK_USAGE
 
          This option will slow down process creation somewhat.
 
+config HCALL_STATS
+       bool "Hypervisor call instrumentation"
+       depends on PPC_PSERIES && DEBUG_FS
+       help
+         Adds code to keep track of the number of hypervisor calls made and
+         the amount of time spent in hypervisor callsr.  Wall time spent in
+         each call is always calculated, and if available CPU cycles spent
+         are also calculated.  A directory named hcall_inst is added at the
+         root of the debugfs filesystem.  Within the hcall_inst directory
+         are files that contain CPU specific call statistics.
+
+         This option will add a small amount of overhead to all hypervisor
+         calls.
+
 config DEBUGGER
        bool "Enable debugger hooks"
        depends on DEBUG_KERNEL
@@ -74,6 +88,8 @@ config XMON
          very early during boot. 'xmon=on' will just enable the xmon
          debugger hooks.  'xmon=off' will disable the debugger hooks
          if CONFIG_XMON_DEFAULT is set.
+         xmon will print a backtrace on the very first invocation.
+         'xmon=nobt' will disable this autobacktrace.
 
 config XMON_DEFAULT
        bool "Enable xmon by default"