| menu "Kernel hacking" | |
| config TRACE_IRQFLAGS_SUPPORT | |
| bool | |
| default y | |
| source "lib/Kconfig.debug" | |
| config EARLY_PRINTK | |
| bool "Early printk" if EMBEDDED && DEBUG_KERNEL | |
| default y | |
| help | |
| Write kernel log output directly into the VGA buffer or to a serial | |
| port. | |
| This is useful for kernel debugging when your machine crashes very | |
| early before the console code is initialized. For normal operation | |
| it is not recommended because it looks ugly and doesn't cooperate | |
| with klogd/syslogd or the X server. You should normally N here, | |
| unless you want to debug such a crash. | |
| config DEBUG_STACKOVERFLOW | |
| bool "Check for stack overflows" | |
| depends on DEBUG_KERNEL | |
| help | |
| This option will cause messages to be printed if free stack space | |
| drops below a certain limit. | |
| config DEBUG_STACK_USAGE | |
| bool "Stack utilization instrumentation" | |
| depends on DEBUG_KERNEL | |
| help | |
| Enables the display of the minimum amount of free stack which each | |
| task has ever had available in the sysrq-T and sysrq-P debug output. | |
| This option will slow down process creation somewhat. | |
| comment "Page alloc debug is incompatible with Software Suspend on i386" | |
| depends on DEBUG_KERNEL && SOFTWARE_SUSPEND | |
| config DEBUG_PAGEALLOC | |
| bool "Debug page memory allocations" | |
| depends on DEBUG_KERNEL && !SOFTWARE_SUSPEND && !HUGETLBFS | |
| help | |
| Unmap pages from the kernel linear mapping after free_pages(). | |
| This results in a large slowdown, but helps to find certain types | |
| of memory corruptions. | |
| config DEBUG_RODATA | |
| bool "Write protect kernel read-only data structures" | |
| depends on DEBUG_KERNEL | |
| help | |
| Mark the kernel read-only data as write-protected in the pagetables, | |
| in order to catch accidental (and incorrect) writes to such const | |
| data. This option may have a slight performance impact because a | |
| portion of the kernel code won't be covered by a 2MB TLB anymore. | |
| If in doubt, say "N". | |
| config 4KSTACKS | |
| bool "Use 4Kb for kernel stacks instead of 8Kb" | |
| depends on DEBUG_KERNEL | |
| help | |
| If you say Y here the kernel will use a 4Kb stacksize for the | |
| kernel stack attached to each process/thread. This facilitates | |
| running more threads on a system and also reduces the pressure | |
| on the VM subsystem for higher order allocations. This option | |
| will also use IRQ stacks to compensate for the reduced stackspace. | |
| config X86_FIND_SMP_CONFIG | |
| bool | |
| depends on X86_LOCAL_APIC || X86_VOYAGER | |
| default y | |
| config X86_MPPARSE | |
| bool | |
| depends on X86_LOCAL_APIC && !X86_VISWS | |
| default y | |
| config DOUBLEFAULT | |
| default y | |
| bool "Enable doublefault exception handler" if EMBEDDED | |
| help | |
| This option allows trapping of rare doublefault exceptions that | |
| would otherwise cause a system to silently reboot. Disabling this | |
| option saves about 4k and might cause you much additional grey | |
| hair. | |
| endmenu |