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a241ec65ae
This patch is a rewrite of the one submitted on October 1st, using modules (http://marc.theaimsgroup.com/?l=linux-kernel&m=112819093522998&w=2). This rewrite adds a tristate CONFIG_RCU_TORTURE_TEST, which enables an intense torture test of the RCU infratructure. This is needed due to the continued changes to the RCU infrastructure to accommodate dynamic ticks, CPU hotplug, realtime, and so on. Most of the code is in a separate file that is compiled only if the CONFIG variable is set. Documentation on how to run the test and interpret the output is also included. This code has been tested on i386 and ppc64, and an earlier version of the code has received extensive testing on a number of architectures as part of the PREEMPT_RT patchset. Signed-off-by: "Paul E. McKenney" <paulmck@us.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
202 lines
6.8 KiB
Plaintext
202 lines
6.8 KiB
Plaintext
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config PRINTK_TIME
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bool "Show timing information on printks"
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help
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Selecting this option causes timing information to be
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included in printk output. This allows you to measure
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the interval between kernel operations, including bootup
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operations. This is useful for identifying long delays
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in kernel startup.
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config DEBUG_KERNEL
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bool "Kernel debugging"
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help
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Say Y here if you are developing drivers or trying to debug and
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identify kernel problems.
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config MAGIC_SYSRQ
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bool "Magic SysRq key"
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depends on DEBUG_KERNEL && !UML
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help
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If you say Y here, you will have some control over the system even
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if the system crashes for example during kernel debugging (e.g., you
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will be able to flush the buffer cache to disk, reboot the system
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immediately or dump some status information). This is accomplished
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by pressing various keys while holding SysRq (Alt+PrintScreen). It
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also works on a serial console (on PC hardware at least), if you
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send a BREAK and then within 5 seconds a command keypress. The
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keys are documented in <file:Documentation/sysrq.txt>. Don't say Y
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unless you really know what this hack does.
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config LOG_BUF_SHIFT
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int "Kernel log buffer size (16 => 64KB, 17 => 128KB)" if DEBUG_KERNEL
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range 12 21
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default 17 if ARCH_S390
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default 16 if X86_NUMAQ || IA64
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default 15 if SMP
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default 14
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help
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Select kernel log buffer size as a power of 2.
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Defaults and Examples:
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17 => 128 KB for S/390
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16 => 64 KB for x86 NUMAQ or IA-64
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15 => 32 KB for SMP
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14 => 16 KB for uniprocessor
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13 => 8 KB
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12 => 4 KB
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config DETECT_SOFTLOCKUP
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bool "Detect Soft Lockups"
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depends on DEBUG_KERNEL
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default y
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help
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Say Y here to enable the kernel to detect "soft lockups",
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which are bugs that cause the kernel to loop in kernel
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mode for more than 10 seconds, without giving other tasks a
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chance to run.
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When a soft-lockup is detected, the kernel will print the
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current stack trace (which you should report), but the
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system will stay locked up. This feature has negligible
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overhead.
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(Note that "hard lockups" are separate type of bugs that
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can be detected via the NMI-watchdog, on platforms that
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support it.)
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config SCHEDSTATS
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bool "Collect scheduler statistics"
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depends on DEBUG_KERNEL && PROC_FS
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help
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If you say Y here, additional code will be inserted into the
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scheduler and related routines to collect statistics about
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scheduler behavior and provide them in /proc/schedstat. These
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stats may be useful for both tuning and debugging the scheduler
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If you aren't debugging the scheduler or trying to tune a specific
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application, you can say N to avoid the very slight overhead
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this adds.
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config DEBUG_SLAB
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bool "Debug memory allocations"
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depends on DEBUG_KERNEL
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help
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Say Y here to have the kernel do limited verification on memory
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allocation as well as poisoning memory on free to catch use of freed
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memory. This can make kmalloc/kfree-intensive workloads much slower.
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config DEBUG_PREEMPT
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bool "Debug preemptible kernel"
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depends on DEBUG_KERNEL && PREEMPT
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default y
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help
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If you say Y here then the kernel will use a debug variant of the
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commonly used smp_processor_id() function and will print warnings
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if kernel code uses it in a preemption-unsafe way. Also, the kernel
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will detect preemption count underflows.
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config DEBUG_SPINLOCK
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bool "Spinlock debugging"
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depends on DEBUG_KERNEL
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help
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Say Y here and build SMP to catch missing spinlock initialization
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and certain other kinds of spinlock errors commonly made. This is
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best used in conjunction with the NMI watchdog so that spinlock
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deadlocks are also debuggable.
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config DEBUG_SPINLOCK_SLEEP
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bool "Sleep-inside-spinlock checking"
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depends on DEBUG_KERNEL
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help
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If you say Y here, various routines which may sleep will become very
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noisy if they are called with a spinlock held.
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config DEBUG_KOBJECT
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bool "kobject debugging"
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depends on DEBUG_KERNEL
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help
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If you say Y here, some extra kobject debugging messages will be sent
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to the syslog.
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config DEBUG_HIGHMEM
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bool "Highmem debugging"
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depends on DEBUG_KERNEL && HIGHMEM
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help
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This options enables addition error checking for high memory systems.
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Disable for production systems.
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config DEBUG_BUGVERBOSE
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bool "Verbose BUG() reporting (adds 70K)" if DEBUG_KERNEL && EMBEDDED
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depends on BUG
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depends on ARM || ARM26 || M32R || M68K || SPARC32 || SPARC64 || X86_32 || FRV
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default !EMBEDDED
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help
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Say Y here to make BUG() panics output the file name and line number
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of the BUG call as well as the EIP and oops trace. This aids
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debugging but costs about 70-100K of memory.
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config DEBUG_INFO
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bool "Compile the kernel with debug info"
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depends on DEBUG_KERNEL
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help
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If you say Y here the resulting kernel image will include
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debugging info resulting in a larger kernel image.
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Say Y here only if you plan to debug the kernel.
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If unsure, say N.
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config DEBUG_IOREMAP
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bool "Enable ioremap() debugging"
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depends on DEBUG_KERNEL && PARISC
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help
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Enabling this option will cause the kernel to distinguish between
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ioremapped and physical addresses. It will print a backtrace (at
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most one every 10 seconds), hopefully allowing you to see which
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drivers need work. Fixing all these problems is a prerequisite
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for turning on USE_HPPA_IOREMAP. The warnings are harmless;
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the kernel has enough information to fix the broken drivers
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automatically, but we'd like to make it more efficient by not
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having to do that.
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config DEBUG_FS
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bool "Debug Filesystem"
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depends on DEBUG_KERNEL && SYSFS
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help
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debugfs is a virtual file system that kernel developers use to put
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debugging files into. Enable this option to be able to read and
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write to these files.
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If unsure, say N.
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config DEBUG_VM
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bool "Debug VM"
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depends on DEBUG_KERNEL
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help
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Enable this to debug the virtual-memory system.
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If unsure, say N.
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config FRAME_POINTER
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bool "Compile the kernel with frame pointers"
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depends on DEBUG_KERNEL && (X86 || CRIS || M68K || M68KNOMMU || FRV || UML)
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default y if DEBUG_INFO && UML
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help
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If you say Y here the resulting kernel image will be slightly larger
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and slower, but it might give very useful debugging information on
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some architectures or if you use external debuggers.
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If you don't debug the kernel, you can say N.
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config RCU_TORTURE_TEST
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tristate "torture tests for RCU"
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depends on DEBUG_KERNEL
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default n
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help
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This option provides a kernel module that runs torture tests
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on the RCU infrastructure. The kernel module may be built
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after the fact on the running kernel to be tested, if desired.
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Say Y here if you want RCU torture tests to start automatically
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at boot time (you probably don't).
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Say M if you want the RCU torture tests to build as a module.
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Say N if you are unsure.
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