| menu "Kernel hacking" |
| |
| source "lib/Kconfig.debug" |
| |
| 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 IOMMU_DEBUG |
| depends on IOMMU && DEBUG_KERNEL |
| bool "Enable IOMMU debugging" |
| help |
| Force the IOMMU to on even when you have less than 4GB of |
| memory and add debugging code. On overflow always panic. And |
| allow to enable IOMMU leak tracing. Can be disabled at boot |
| time with iommu=noforce. This will also enable scatter gather |
| list merging. Currently not recommended for production |
| code. When you use it make sure you have a big enough |
| IOMMU/AGP aperture. Most of the options enabled by this can |
| be set more finegrained using the iommu= command line |
| options. See Documentation/x86_64/boot-options.txt for more |
| details. |
| |
| config IOMMU_LEAK |
| bool "IOMMU leak tracing" |
| depends on DEBUG_KERNEL |
| depends on IOMMU_DEBUG |
| help |
| Add a simple leak tracer to the IOMMU code. This is useful when you |
| are debugging a buggy device driver that leaks IOMMU mappings. |
| |
| 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. |
| |
| #config X86_REMOTE_DEBUG |
| # bool "kgdb debugging stub" |
| |
| endmenu |
