arch/i386/Kconfig.debug

   1 menu "Kernel hacking"
   2
   3 source "lib/Kconfig.debug"
   4
   5 config EARLY_PRINTK
   6         bool "Early printk" if EMBEDDED && DEBUG_KERNEL
   7         default y
   8         help
   9           Write kernel log output directly into the VGA buffer or to a serial
  10           port.
  11
  12           This is useful for kernel debugging when your machine crashes very
  13           early before the console code is initialized. For normal operation
  14           it is not recommended because it looks ugly and doesn't cooperate
  15           with klogd/syslogd or the X server. You should normally N here,
  16           unless you want to debug such a crash.
  17
  18 config DEBUG_STACKOVERFLOW
  19         bool "Check for stack overflows"
  20         depends on DEBUG_KERNEL
  21         help
  22           This option will cause messages to be printed if free stack space
  23           drops below a certain limit.
  24
  25 config DEBUG_STACK_USAGE
  26         bool "Stack utilization instrumentation"
  27         depends on DEBUG_KERNEL
  28         help
  29           Enables the display of the minimum amount of free stack which each
  30           task has ever had available in the sysrq-T and sysrq-P debug output.
  31
  32           This option will slow down process creation somewhat.
  33
  34 comment "Page alloc debug is incompatible with Software Suspend on i386"
  35         depends on DEBUG_KERNEL && SOFTWARE_SUSPEND
  36
  37 config DEBUG_PAGEALLOC
  38         bool "Page alloc debugging"
  39         depends on DEBUG_KERNEL && !SOFTWARE_SUSPEND
  40         help
  41           Unmap pages from the kernel linear mapping after free_pages().
  42           This results in a large slowdown, but helps to find certain types
  43           of memory corruptions.
  44
  45 config DEBUG_RODATA
  46         bool "Write protect kernel read-only data structures"
  47         depends on DEBUG_KERNEL
  48         help
  49           Mark the kernel read-only data as write-protected in the pagetables,
  50           in order to catch accidental (and incorrect) writes to such const
  51           data. This option may have a slight performance impact because a
  52           portion of the kernel code won't be covered by a 2MB TLB anymore.
  53           If in doubt, say "N".
  54
  55 config 4KSTACKS
  56         bool "Use 4Kb for kernel stacks instead of 8Kb"
  57         depends on DEBUG_KERNEL
  58         help
  59           If you say Y here the kernel will use a 4Kb stacksize for the
  60           kernel stack attached to each process/thread. This facilitates
  61           running more threads on a system and also reduces the pressure
  62           on the VM subsystem for higher order allocations. This option
  63           will also use IRQ stacks to compensate for the reduced stackspace.
  64
  65 config X86_FIND_SMP_CONFIG
  66         bool
  67         depends on X86_LOCAL_APIC || X86_VOYAGER
  68         default y
  69
  70 config X86_MPPARSE
  71         bool
  72         depends on X86_LOCAL_APIC && !X86_VISWS
  73         default y
  74
  75 endmenu