Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | menu "Kernel hacking" |
| 2 | |
Ingo Molnar | 55f327f | 2006-07-03 00:24:43 -0700 | [diff] [blame] | 3 | config TRACE_IRQFLAGS_SUPPORT |
Randy Dunlap | d013a27 | 2007-10-24 15:50:43 -0700 | [diff] [blame] | 4 | def_bool y |
Ingo Molnar | 55f327f | 2006-07-03 00:24:43 -0700 | [diff] [blame] | 5 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | source "lib/Kconfig.debug" |
| 7 | |
| 8 | config EARLY_PRINTK |
Adrian Bunk | 1b8a8e9 | 2007-10-29 13:49:36 +0100 | [diff] [blame] | 9 | bool "Early printk" if EMBEDDED && DEBUG_KERNEL && X86_32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | default y |
| 11 | help |
| 12 | Write kernel log output directly into the VGA buffer or to a serial |
| 13 | port. |
| 14 | |
| 15 | This is useful for kernel debugging when your machine crashes very |
| 16 | early before the console code is initialized. For normal operation |
| 17 | it is not recommended because it looks ugly and doesn't cooperate |
| 18 | with klogd/syslogd or the X server. You should normally N here, |
| 19 | unless you want to debug such a crash. |
| 20 | |
| 21 | config DEBUG_STACKOVERFLOW |
| 22 | bool "Check for stack overflows" |
| 23 | depends on DEBUG_KERNEL |
Adrian Bunk | dab175f | 2005-07-27 11:44:23 -0700 | [diff] [blame] | 24 | help |
| 25 | This option will cause messages to be printed if free stack space |
| 26 | drops below a certain limit. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | config DEBUG_STACK_USAGE |
| 29 | bool "Stack utilization instrumentation" |
| 30 | depends on DEBUG_KERNEL |
| 31 | help |
| 32 | Enables the display of the minimum amount of free stack which each |
| 33 | task has ever had available in the sysrq-T and sysrq-P debug output. |
| 34 | |
| 35 | This option will slow down process creation somewhat. |
| 36 | |
| 37 | comment "Page alloc debug is incompatible with Software Suspend on i386" |
Rafael J. Wysocki | b0cb1a1 | 2007-07-29 23:24:36 +0200 | [diff] [blame] | 38 | depends on DEBUG_KERNEL && HIBERNATION |
Randy Dunlap | d013a27 | 2007-10-24 15:50:43 -0700 | [diff] [blame] | 39 | depends on X86_32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | |
| 41 | config DEBUG_PAGEALLOC |
Andrew Morton | 4a2f0ac | 2006-03-25 03:07:22 -0800 | [diff] [blame] | 42 | bool "Debug page memory allocations" |
Rafael J. Wysocki | b0cb1a1 | 2007-07-29 23:24:36 +0200 | [diff] [blame] | 43 | depends on DEBUG_KERNEL && !HIBERNATION && !HUGETLBFS |
Randy Dunlap | d013a27 | 2007-10-24 15:50:43 -0700 | [diff] [blame] | 44 | depends on X86_32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | help |
| 46 | Unmap pages from the kernel linear mapping after free_pages(). |
| 47 | This results in a large slowdown, but helps to find certain types |
| 48 | of memory corruptions. |
| 49 | |
Arjan van de Ven | 63aaf30 | 2006-01-06 00:12:02 -0800 | [diff] [blame] | 50 | config DEBUG_RODATA |
| 51 | bool "Write protect kernel read-only data structures" |
| 52 | depends on DEBUG_KERNEL |
| 53 | help |
| 54 | Mark the kernel read-only data as write-protected in the pagetables, |
| 55 | in order to catch accidental (and incorrect) writes to such const |
| 56 | data. This option may have a slight performance impact because a |
| 57 | portion of the kernel code won't be covered by a 2MB TLB anymore. |
| 58 | If in doubt, say "N". |
| 59 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | config 4KSTACKS |
| 61 | bool "Use 4Kb for kernel stacks instead of 8Kb" |
| 62 | depends on DEBUG_KERNEL |
Randy Dunlap | d013a27 | 2007-10-24 15:50:43 -0700 | [diff] [blame] | 63 | depends on X86_32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | help |
| 65 | If you say Y here the kernel will use a 4Kb stacksize for the |
| 66 | kernel stack attached to each process/thread. This facilitates |
| 67 | running more threads on a system and also reduces the pressure |
| 68 | on the VM subsystem for higher order allocations. This option |
| 69 | will also use IRQ stacks to compensate for the reduced stackspace. |
| 70 | |
| 71 | config X86_FIND_SMP_CONFIG |
Randy Dunlap | d013a27 | 2007-10-24 15:50:43 -0700 | [diff] [blame] | 72 | def_bool y |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | depends on X86_LOCAL_APIC || X86_VOYAGER |
Randy Dunlap | d013a27 | 2007-10-24 15:50:43 -0700 | [diff] [blame] | 74 | depends on X86_32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | |
| 76 | config X86_MPPARSE |
Randy Dunlap | d013a27 | 2007-10-24 15:50:43 -0700 | [diff] [blame] | 77 | def_bool y |
Sam Ravnborg | 6b0c3d4 | 2008-01-30 13:32:27 +0100 | [diff] [blame] | 78 | depends on (X86_32 && (X86_LOCAL_APIC && !X86_VISWS)) || X86_64 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | |
Andi Kleen | 102e41f | 2006-04-18 12:35:22 +0200 | [diff] [blame] | 80 | config DOUBLEFAULT |
| 81 | default y |
| 82 | bool "Enable doublefault exception handler" if EMBEDDED |
Randy Dunlap | d013a27 | 2007-10-24 15:50:43 -0700 | [diff] [blame] | 83 | depends on X86_32 |
Andi Kleen | 102e41f | 2006-04-18 12:35:22 +0200 | [diff] [blame] | 84 | help |
Randy Dunlap | d013a27 | 2007-10-24 15:50:43 -0700 | [diff] [blame] | 85 | This option allows trapping of rare doublefault exceptions that |
| 86 | would otherwise cause a system to silently reboot. Disabling this |
| 87 | option saves about 4k and might cause you much additional grey |
| 88 | hair. |
| 89 | |
| 90 | config IOMMU_DEBUG |
| 91 | bool "Enable IOMMU debugging" |
Joerg Roedel | 966396d | 2007-10-24 12:49:48 +0200 | [diff] [blame] | 92 | depends on GART_IOMMU && DEBUG_KERNEL |
Randy Dunlap | d013a27 | 2007-10-24 15:50:43 -0700 | [diff] [blame] | 93 | depends on X86_64 |
| 94 | help |
| 95 | Force the IOMMU to on even when you have less than 4GB of |
| 96 | memory and add debugging code. On overflow always panic. And |
| 97 | allow to enable IOMMU leak tracing. Can be disabled at boot |
| 98 | time with iommu=noforce. This will also enable scatter gather |
| 99 | list merging. Currently not recommended for production |
| 100 | code. When you use it make sure you have a big enough |
| 101 | IOMMU/AGP aperture. Most of the options enabled by this can |
| 102 | be set more finegrained using the iommu= command line |
| 103 | options. See Documentation/x86_64/boot-options.txt for more |
| 104 | details. |
| 105 | |
| 106 | config IOMMU_LEAK |
| 107 | bool "IOMMU leak tracing" |
| 108 | depends on DEBUG_KERNEL |
| 109 | depends on IOMMU_DEBUG |
| 110 | help |
| 111 | Add a simple leak tracer to the IOMMU code. This is useful when you |
| 112 | are debugging a buggy device driver that leaks IOMMU mappings. |
| 113 | |
Ingo Molnar | 6e7c402 | 2008-01-30 13:30:05 +0100 | [diff] [blame] | 114 | # |
| 115 | # IO delay types: |
| 116 | # |
| 117 | |
| 118 | config IO_DELAY_TYPE_0X80 |
| 119 | int |
| 120 | default "0" |
| 121 | |
| 122 | config IO_DELAY_TYPE_0XED |
| 123 | int |
| 124 | default "1" |
| 125 | |
| 126 | config IO_DELAY_TYPE_UDELAY |
| 127 | int |
| 128 | default "2" |
| 129 | |
| 130 | config IO_DELAY_TYPE_NONE |
| 131 | int |
| 132 | default "3" |
| 133 | |
| 134 | choice |
| 135 | prompt "IO delay type" |
Ingo Molnar | d0049e7 | 2008-01-30 13:30:05 +0100 | [diff] [blame] | 136 | default IO_DELAY_0XED |
Ingo Molnar | 6e7c402 | 2008-01-30 13:30:05 +0100 | [diff] [blame] | 137 | |
| 138 | config IO_DELAY_0X80 |
| 139 | bool "port 0x80 based port-IO delay [recommended]" |
Rene Herman | b02aae9 | 2008-01-30 13:30:05 +0100 | [diff] [blame] | 140 | help |
Ingo Molnar | 6e7c402 | 2008-01-30 13:30:05 +0100 | [diff] [blame] | 141 | This is the traditional Linux IO delay used for in/out_p. |
| 142 | It is the most tested hence safest selection here. |
| 143 | |
| 144 | config IO_DELAY_0XED |
| 145 | bool "port 0xed based port-IO delay" |
| 146 | help |
| 147 | Use port 0xed as the IO delay. This frees up port 0x80 which is |
| 148 | often used as a hardware-debug port. |
| 149 | |
| 150 | config IO_DELAY_UDELAY |
| 151 | bool "udelay based port-IO delay" |
| 152 | help |
| 153 | Use udelay(2) as the IO delay method. This provides the delay |
| 154 | while not having any side-effect on the IO port space. |
| 155 | |
| 156 | config IO_DELAY_NONE |
| 157 | bool "no port-IO delay" |
| 158 | help |
| 159 | No port-IO delay. Will break on old boxes that require port-IO |
| 160 | delay for certain operations. Should work on most new machines. |
| 161 | |
| 162 | endchoice |
| 163 | |
| 164 | if IO_DELAY_0X80 |
| 165 | config DEFAULT_IO_DELAY_TYPE |
| 166 | int |
| 167 | default IO_DELAY_TYPE_0X80 |
| 168 | endif |
| 169 | |
| 170 | if IO_DELAY_0XED |
| 171 | config DEFAULT_IO_DELAY_TYPE |
| 172 | int |
| 173 | default IO_DELAY_TYPE_0XED |
| 174 | endif |
| 175 | |
| 176 | if IO_DELAY_UDELAY |
| 177 | config DEFAULT_IO_DELAY_TYPE |
| 178 | int |
| 179 | default IO_DELAY_TYPE_UDELAY |
| 180 | endif |
| 181 | |
| 182 | if IO_DELAY_NONE |
| 183 | config DEFAULT_IO_DELAY_TYPE |
| 184 | int |
| 185 | default IO_DELAY_TYPE_NONE |
| 186 | endif |
Rene Herman | b02aae9 | 2008-01-30 13:30:05 +0100 | [diff] [blame] | 187 | |
Huang, Ying | 6d7d743 | 2008-01-30 13:32:51 +0100 | [diff] [blame] | 188 | config DEBUG_BOOT_PARAMS |
| 189 | bool "Debug boot parameters" |
| 190 | depends on DEBUG_KERNEL |
| 191 | depends on DEBUG_FS |
| 192 | help |
| 193 | This option will cause struct boot_params to be exported via debugfs. |
| 194 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | endmenu |