Commit | Line | Data |
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1da177e4 LT |
1 | menu "Kernel hacking" |
2 | ||
55f327fa IM |
3 | config TRACE_IRQFLAGS_SUPPORT |
4 | bool | |
5 | default y | |
6 | ||
1da177e4 LT |
7 | source "lib/Kconfig.debug" |
8 | ||
9 | config EARLY_PRINTK | |
10 | bool "Early printk" if EMBEDDED && DEBUG_KERNEL | |
11 | default y | |
12 | help | |
13 | Write kernel log output directly into the VGA buffer or to a serial | |
14 | port. | |
15 | ||
16 | This is useful for kernel debugging when your machine crashes very | |
17 | early before the console code is initialized. For normal operation | |
18 | it is not recommended because it looks ugly and doesn't cooperate | |
19 | with klogd/syslogd or the X server. You should normally N here, | |
20 | unless you want to debug such a crash. | |
21 | ||
22 | config DEBUG_STACKOVERFLOW | |
23 | bool "Check for stack overflows" | |
24 | depends on DEBUG_KERNEL | |
dab175f3 AB |
25 | help |
26 | This option will cause messages to be printed if free stack space | |
27 | drops below a certain limit. | |
1da177e4 | 28 | |
1da177e4 LT |
29 | config DEBUG_STACK_USAGE |
30 | bool "Stack utilization instrumentation" | |
31 | depends on DEBUG_KERNEL | |
32 | help | |
33 | Enables the display of the minimum amount of free stack which each | |
34 | task has ever had available in the sysrq-T and sysrq-P debug output. | |
35 | ||
36 | This option will slow down process creation somewhat. | |
37 | ||
38 | comment "Page alloc debug is incompatible with Software Suspend on i386" | |
b0cb1a19 | 39 | depends on DEBUG_KERNEL && HIBERNATION |
1da177e4 LT |
40 | |
41 | config DEBUG_PAGEALLOC | |
4a2f0acf | 42 | bool "Debug page memory allocations" |
b0cb1a19 | 43 | depends on DEBUG_KERNEL && !HIBERNATION && !HUGETLBFS |
1da177e4 LT |
44 | help |
45 | Unmap pages from the kernel linear mapping after free_pages(). | |
46 | This results in a large slowdown, but helps to find certain types | |
47 | of memory corruptions. | |
48 | ||
63aaf308 AV |
49 | config DEBUG_RODATA |
50 | bool "Write protect kernel read-only data structures" | |
51 | depends on DEBUG_KERNEL | |
52 | help | |
53 | Mark the kernel read-only data as write-protected in the pagetables, | |
54 | in order to catch accidental (and incorrect) writes to such const | |
55 | data. This option may have a slight performance impact because a | |
56 | portion of the kernel code won't be covered by a 2MB TLB anymore. | |
57 | If in doubt, say "N". | |
58 | ||
1da177e4 LT |
59 | config 4KSTACKS |
60 | bool "Use 4Kb for kernel stacks instead of 8Kb" | |
61 | depends on DEBUG_KERNEL | |
62 | help | |
63 | If you say Y here the kernel will use a 4Kb stacksize for the | |
64 | kernel stack attached to each process/thread. This facilitates | |
65 | running more threads on a system and also reduces the pressure | |
66 | on the VM subsystem for higher order allocations. This option | |
67 | will also use IRQ stacks to compensate for the reduced stackspace. | |
68 | ||
69 | config X86_FIND_SMP_CONFIG | |
70 | bool | |
71 | depends on X86_LOCAL_APIC || X86_VOYAGER | |
72 | default y | |
73 | ||
74 | config X86_MPPARSE | |
75 | bool | |
76 | depends on X86_LOCAL_APIC && !X86_VISWS | |
77 | default y | |
78 | ||
102e41fd AK |
79 | config DOUBLEFAULT |
80 | default y | |
81 | bool "Enable doublefault exception handler" if EMBEDDED | |
82 | help | |
83 | This option allows trapping of rare doublefault exceptions that | |
84 | would otherwise cause a system to silently reboot. Disabling this | |
85 | option saves about 4k and might cause you much additional grey | |
86 | hair. | |
87 | ||
1da177e4 | 88 | endmenu |