1 | menu "Kernel hacking" |
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2 | |
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3 | config TRACE_IRQFLAGS_SUPPORT |
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4 | bool |
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5 | default y |
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6 | |
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7 | source "lib/Kconfig.debug" |
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8 | |
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9 | config EARLY_PRINTK |
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10 | bool "Early printk" if EMBEDDED && DEBUG_KERNEL |
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11 | default y |
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12 | help |
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13 | Write kernel log output directly into the VGA buffer or to a serial |
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14 | port. |
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15 | |
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16 | This is useful for kernel debugging when your machine crashes very |
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17 | early before the console code is initialized. For normal operation |
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18 | it is not recommended because it looks ugly and doesn't cooperate |
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19 | with klogd/syslogd or the X server. You should normally N here, |
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20 | unless you want to debug such a crash. |
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21 | |
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22 | config DEBUG_STACKOVERFLOW |
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23 | bool "Check for stack overflows" |
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24 | depends on DEBUG_KERNEL |
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25 | help |
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26 | This option will cause messages to be printed if free stack space |
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27 | drops below a certain limit. |
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28 | |
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29 | config DEBUG_STACK_USAGE |
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30 | bool "Stack utilization instrumentation" |
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31 | depends on DEBUG_KERNEL |
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32 | help |
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33 | Enables the display of the minimum amount of free stack which each |
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34 | task has ever had available in the sysrq-T and sysrq-P debug output. |
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35 | |
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36 | This option will slow down process creation somewhat. |
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37 | |
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38 | comment "Page alloc debug is incompatible with Software Suspend on i386" |
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39 | depends on DEBUG_KERNEL && SOFTWARE_SUSPEND |
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40 | |
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41 | config DEBUG_PAGEALLOC |
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42 | bool "Debug page memory allocations" |
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43 | depends on DEBUG_KERNEL && !SOFTWARE_SUSPEND && !HUGETLBFS |
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44 | help |
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45 | Unmap pages from the kernel linear mapping after free_pages(). |
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46 | This results in a large slowdown, but helps to find certain types |
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47 | of memory corruptions. |
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48 | |
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49 | config DEBUG_RODATA |
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50 | bool "Write protect kernel read-only data structures" |
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51 | depends on DEBUG_KERNEL |
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52 | help |
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53 | Mark the kernel read-only data as write-protected in the pagetables, |
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54 | in order to catch accidental (and incorrect) writes to such const |
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55 | data. This option may have a slight performance impact because a |
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56 | portion of the kernel code won't be covered by a 2MB TLB anymore. |
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57 | If in doubt, say "N". |
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58 | |
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59 | config 4KSTACKS |
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60 | bool "Use 4Kb for kernel stacks instead of 8Kb" |
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61 | depends on DEBUG_KERNEL |
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62 | help |
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63 | If you say Y here the kernel will use a 4Kb stacksize for the |
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64 | kernel stack attached to each process/thread. This facilitates |
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65 | running more threads on a system and also reduces the pressure |
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66 | on the VM subsystem for higher order allocations. This option |
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67 | will also use IRQ stacks to compensate for the reduced stackspace. |
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68 | |
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69 | config X86_FIND_SMP_CONFIG |
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70 | bool |
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71 | depends on X86_LOCAL_APIC || X86_VOYAGER |
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72 | default y |
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73 | |
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74 | config X86_MPPARSE |
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75 | bool |
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76 | depends on X86_LOCAL_APIC && !X86_VISWS |
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77 | default y |
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78 | |
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79 | config DOUBLEFAULT |
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80 | default y |
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81 | bool "Enable doublefault exception handler" if EMBEDDED |
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82 | depends on !X86_NO_TSS |
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83 | help |
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84 | This option allows trapping of rare doublefault exceptions that |
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85 | would otherwise cause a system to silently reboot. Disabling this |
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86 | option saves about 4k and might cause you much additional grey |
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87 | hair. |
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88 | |
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89 | endmenu |
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