[PATCH] x86_64: x86_64 stack usage debugging
[deliverable/linux.git] / arch / x86_64 / Kconfig.debug
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1menu "Kernel hacking"
2
3source "lib/Kconfig.debug"
4
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5config DEBUG_RODATA
6 bool "Write protect kernel read-only data structures"
7 depends on DEBUG_KERNEL
8 help
9 Mark the kernel read-only data as write-protected in the pagetables,
10 in order to catch accidental (and incorrect) writes to such const data.
11 This option may have a slight performance impact because a portion
12 of the kernel code won't be covered by a 2MB TLB anymore.
13 If in doubt, say "N".
14
1da177e4 15config IOMMU_DEBUG
a813ce43 16 depends on IOMMU && DEBUG_KERNEL
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17 bool "Enable IOMMU debugging"
18 help
19 Force the IOMMU to on even when you have less than 4GB of
20 memory and add debugging code. On overflow always panic. And
21 allow to enable IOMMU leak tracing. Can be disabled at boot
22 time with iommu=noforce. This will also enable scatter gather
23 list merging. Currently not recommended for production
24 code. When you use it make sure you have a big enough
25 IOMMU/AGP aperture. Most of the options enabled by this can
26 be set more finegrained using the iommu= command line
27 options. See Documentation/x86_64/boot-options.txt for more
28 details.
29
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30config IOMMU_LEAK
31 bool "IOMMU leak tracing"
32 depends on DEBUG_KERNEL
33 depends on IOMMU_DEBUG
34 help
35 Add a simple leak tracer to the IOMMU code. This is useful when you
36 are debugging a buggy device driver that leaks IOMMU mappings.
37
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38config DEBUG_STACKOVERFLOW
39 bool "Check for stack overflows"
40 depends on DEBUG_KERNEL
41 help
42 This option will cause messages to be printed if free stack space
43 drops below a certain limit.
44
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45config DEBUG_STACK_USAGE
46 bool "Stack utilization instrumentation"
47 depends on DEBUG_KERNEL
48 help
49 Enables the display of the minimum amount of free stack which each
50 task has ever had available in the sysrq-T and sysrq-P debug output.
51
52 This option will slow down process creation somewhat.
53
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54#config X86_REMOTE_DEBUG
55# bool "kgdb debugging stub"
56
57endmenu
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