| [34] | 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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