You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
180 lines
6.2 KiB
180 lines
6.2 KiB
|
|
config PRINTK_TIME
|
|
bool "Show timing information on printks"
|
|
help
|
|
Selecting this option causes timing information to be
|
|
included in printk output. This allows you to measure
|
|
the interval between kernel operations, including bootup
|
|
operations. This is useful for identifying long delays
|
|
in kernel startup.
|
|
|
|
|
|
config DEBUG_KERNEL
|
|
bool "Kernel debugging"
|
|
help
|
|
Say Y here if you are developing drivers or trying to debug and
|
|
identify kernel problems.
|
|
|
|
config MAGIC_SYSRQ
|
|
bool "Magic SysRq key"
|
|
depends on DEBUG_KERNEL && !UML
|
|
help
|
|
If you say Y here, you will have some control over the system even
|
|
if the system crashes for example during kernel debugging (e.g., you
|
|
will be able to flush the buffer cache to disk, reboot the system
|
|
immediately or dump some status information). This is accomplished
|
|
by pressing various keys while holding SysRq (Alt+PrintScreen). It
|
|
also works on a serial console (on PC hardware at least), if you
|
|
send a BREAK and then within 5 seconds a command keypress. The
|
|
keys are documented in <file:Documentation/sysrq.txt>. Don't say Y
|
|
unless you really know what this hack does.
|
|
|
|
config LOG_BUF_SHIFT
|
|
int "Kernel log buffer size (16 => 64KB, 17 => 128KB)" if DEBUG_KERNEL
|
|
range 12 21
|
|
default 17 if ARCH_S390
|
|
default 16 if X86_NUMAQ || IA64
|
|
default 15 if SMP
|
|
default 14
|
|
help
|
|
Select kernel log buffer size as a power of 2.
|
|
Defaults and Examples:
|
|
17 => 128 KB for S/390
|
|
16 => 64 KB for x86 NUMAQ or IA-64
|
|
15 => 32 KB for SMP
|
|
14 => 16 KB for uniprocessor
|
|
13 => 8 KB
|
|
12 => 4 KB
|
|
|
|
config DETECT_SOFTLOCKUP
|
|
bool "Detect Soft Lockups"
|
|
depends on DEBUG_KERNEL
|
|
default y
|
|
help
|
|
Say Y here to enable the kernel to detect "soft lockups",
|
|
which are bugs that cause the kernel to loop in kernel
|
|
mode for more than 10 seconds, without giving other tasks a
|
|
chance to run.
|
|
|
|
When a soft-lockup is detected, the kernel will print the
|
|
current stack trace (which you should report), but the
|
|
system will stay locked up. This feature has negligible
|
|
overhead.
|
|
|
|
(Note that "hard lockups" are separate type of bugs that
|
|
can be detected via the NMI-watchdog, on platforms that
|
|
support it.)
|
|
|
|
config SCHEDSTATS
|
|
bool "Collect scheduler statistics"
|
|
depends on DEBUG_KERNEL && PROC_FS
|
|
help
|
|
If you say Y here, additional code will be inserted into the
|
|
scheduler and related routines to collect statistics about
|
|
scheduler behavior and provide them in /proc/schedstat. These
|
|
stats may be useful for both tuning and debugging the scheduler
|
|
If you aren't debugging the scheduler or trying to tune a specific
|
|
application, you can say N to avoid the very slight overhead
|
|
this adds.
|
|
|
|
config DEBUG_SLAB
|
|
bool "Debug memory allocations"
|
|
depends on DEBUG_KERNEL
|
|
help
|
|
Say Y here to have the kernel do limited verification on memory
|
|
allocation as well as poisoning memory on free to catch use of freed
|
|
memory. This can make kmalloc/kfree-intensive workloads much slower.
|
|
|
|
config DEBUG_PREEMPT
|
|
bool "Debug preemptible kernel"
|
|
depends on DEBUG_KERNEL && PREEMPT
|
|
default y
|
|
help
|
|
If you say Y here then the kernel will use a debug variant of the
|
|
commonly used smp_processor_id() function and will print warnings
|
|
if kernel code uses it in a preemption-unsafe way. Also, the kernel
|
|
will detect preemption count underflows.
|
|
|
|
config DEBUG_SPINLOCK
|
|
bool "Spinlock debugging"
|
|
depends on DEBUG_KERNEL
|
|
help
|
|
Say Y here and build SMP to catch missing spinlock initialization
|
|
and certain other kinds of spinlock errors commonly made. This is
|
|
best used in conjunction with the NMI watchdog so that spinlock
|
|
deadlocks are also debuggable.
|
|
|
|
config DEBUG_SPINLOCK_SLEEP
|
|
bool "Sleep-inside-spinlock checking"
|
|
depends on DEBUG_KERNEL
|
|
help
|
|
If you say Y here, various routines which may sleep will become very
|
|
noisy if they are called with a spinlock held.
|
|
|
|
config DEBUG_KOBJECT
|
|
bool "kobject debugging"
|
|
depends on DEBUG_KERNEL
|
|
help
|
|
If you say Y here, some extra kobject debugging messages will be sent
|
|
to the syslog.
|
|
|
|
config DEBUG_HIGHMEM
|
|
bool "Highmem debugging"
|
|
depends on DEBUG_KERNEL && HIGHMEM
|
|
help
|
|
This options enables addition error checking for high memory systems.
|
|
Disable for production systems.
|
|
|
|
config DEBUG_BUGVERBOSE
|
|
bool "Verbose BUG() reporting (adds 70K)" if DEBUG_KERNEL && EMBEDDED
|
|
depends on BUG
|
|
depends on ARM || ARM26 || M32R || M68K || SPARC32 || SPARC64 || (X86 && !X86_64) || FRV
|
|
default !EMBEDDED
|
|
help
|
|
Say Y here to make BUG() panics output the file name and line number
|
|
of the BUG call as well as the EIP and oops trace. This aids
|
|
debugging but costs about 70-100K of memory.
|
|
|
|
config DEBUG_INFO
|
|
bool "Compile the kernel with debug info"
|
|
depends on DEBUG_KERNEL
|
|
help
|
|
If you say Y here the resulting kernel image will include
|
|
debugging info resulting in a larger kernel image.
|
|
Say Y here only if you plan to debug the kernel.
|
|
|
|
If unsure, say N.
|
|
|
|
config DEBUG_IOREMAP
|
|
bool "Enable ioremap() debugging"
|
|
depends on DEBUG_KERNEL && PARISC
|
|
help
|
|
Enabling this option will cause the kernel to distinguish between
|
|
ioremapped and physical addresses. It will print a backtrace (at
|
|
most one every 10 seconds), hopefully allowing you to see which
|
|
drivers need work. Fixing all these problems is a prerequisite
|
|
for turning on USE_HPPA_IOREMAP. The warnings are harmless;
|
|
the kernel has enough information to fix the broken drivers
|
|
automatically, but we'd like to make it more efficient by not
|
|
having to do that.
|
|
|
|
config DEBUG_FS
|
|
bool "Debug Filesystem"
|
|
depends on DEBUG_KERNEL && SYSFS
|
|
help
|
|
debugfs is a virtual file system that kernel developers use to put
|
|
debugging files into. Enable this option to be able to read and
|
|
write to these files.
|
|
|
|
If unsure, say N.
|
|
|
|
config FRAME_POINTER
|
|
bool "Compile the kernel with frame pointers"
|
|
depends on DEBUG_KERNEL && (X86 || CRIS || M68K || M68KNOMMU || FRV || UML)
|
|
default y if DEBUG_INFO && UML
|
|
help
|
|
If you say Y here the resulting kernel image will be slightly larger
|
|
and slower, but it might give very useful debugging information
|
|
on some architectures or you use external debuggers.
|
|
If you don't debug the kernel, you can say N.
|
|
|
|
|