3 source "lib/Kconfig.debug"
6 bool "Early printk" if EMBEDDED
9 Write kernel log output directly into the VGA buffer or to a serial
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.
18 config DEBUG_STACKOVERFLOW
19 bool "Check for stack overflows"
20 depends on DEBUG_KERNEL
24 depends on DEBUG_KERNEL
26 Kprobes allows you to trap at almost any kernel address and
27 execute a callback function. register_kprobe() establishes
28 a probepoint and specifies the callback. Kprobes is useful
29 for kernel debugging, non-intrusive instrumentation and testing.
32 config DEBUG_STACK_USAGE
33 bool "Stack utilization instrumentation"
34 depends on DEBUG_KERNEL
36 Enables the display of the minimum amount of free stack which each
37 task has ever had available in the sysrq-T and sysrq-P debug output.
39 This option will slow down process creation somewhat.
41 config DEBUG_PAGEALLOC
42 bool "Page alloc debugging"
43 depends on DEBUG_KERNEL
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.
50 bool "Use 4Kb for kernel stacks instead of 8Kb"
52 If you say Y here the kernel will use a 4Kb stacksize for the
53 kernel stack attached to each process/thread. This facilitates
54 running more threads on a system and also reduces the pressure
55 on the VM subsystem for higher order allocations. This option
56 will also use IRQ stacks to compensate for the reduced stackspace.
59 bool "Collect scheduler statistics"
60 depends on DEBUG_KERNEL && PROC_FS
62 If you say Y here, additional code will be inserted into the
63 scheduler and related routines to collect statistics about
64 scheduler behavior and provide them in /proc/schedstat. These
65 stats may be useful for both tuning and debugging the scheduler
66 If you aren't debugging the scheduler or trying to tune a specific
67 application, you can say N to avoid the very slight overhead
70 config X86_FIND_SMP_CONFIG
72 depends on X86_LOCAL_APIC || X86_VOYAGER
77 depends on X86_LOCAL_APIC && !X86_VISWS