Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1menu "Kernel hacking"
2
3source "lib/Kconfig.debug"
4
5config EARLY_PRINTK
6 bool "Early printk" if EMBEDDED && DEBUG_KERNEL
7 default y
8 help
9 Write kernel log output directly into the VGA buffer or to a serial
10 port.
11
12 This is useful for kernel debugging when your machine crashes very
13 early before the console code is initialized. For normal operation
14 it is not recommended because it looks ugly and doesn't cooperate
15 with klogd/syslogd or the X server. You should normally N here,
16 unless you want to debug such a crash.
17
18config DEBUG_STACKOVERFLOW
19 bool "Check for stack overflows"
20 depends on DEBUG_KERNEL
21 help
22 This option will cause messages to be printed if free stack space
23 drops below a certain limit.
24
25config KPROBES
26 bool "Kprobes"
27 depends on DEBUG_KERNEL
28 help
29 Kprobes allows you to trap at almost any kernel address and
30 execute a callback function. register_kprobe() establishes
31 a probepoint and specifies the callback. Kprobes is useful
32 for kernel debugging, non-intrusive instrumentation and testing.
33 If in doubt, say "N".
34
35config DEBUG_STACK_USAGE
36 bool "Stack utilization instrumentation"
37 depends on DEBUG_KERNEL
38 help
39 Enables the display of the minimum amount of free stack which each
40 task has ever had available in the sysrq-T and sysrq-P debug output.
41
42 This option will slow down process creation somewhat.
43
44comment "Page alloc debug is incompatible with Software Suspend on i386"
45 depends on DEBUG_KERNEL && SOFTWARE_SUSPEND
46
47config DEBUG_PAGEALLOC
48 bool "Page alloc debugging"
49 depends on DEBUG_KERNEL && !SOFTWARE_SUSPEND
50 help
51 Unmap pages from the kernel linear mapping after free_pages().
52 This results in a large slowdown, but helps to find certain types
53 of memory corruptions.
54
55config 4KSTACKS
56 bool "Use 4Kb for kernel stacks instead of 8Kb"
57 depends on DEBUG_KERNEL
58 help
59 If you say Y here the kernel will use a 4Kb stacksize for the
60 kernel stack attached to each process/thread. This facilitates
61 running more threads on a system and also reduces the pressure
62 on the VM subsystem for higher order allocations. This option
63 will also use IRQ stacks to compensate for the reduced stackspace.
64
65config X86_FIND_SMP_CONFIG
66 bool
67 depends on X86_LOCAL_APIC || X86_VOYAGER
68 default y
69
70config X86_MPPARSE
71 bool
72 depends on X86_LOCAL_APIC && !X86_VISWS
73 default y
74
75endmenu