"Tree RCU": scalable classic RCU implementation

[safe/jmp/linux-2.6] / lib / Kconfig.debug

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 099cb7b..465d822 100644 (file)
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -25,6 +25,17 @@ config ENABLE_MUST_CHECK
          suppress the "warning: ignoring return value of 'foo', declared with
          attribute warn_unused_result" messages.
 
          suppress the "warning: ignoring return value of 'foo', declared with
          attribute warn_unused_result" messages.
 

+config FRAME_WARN
+       int "Warn for stack frames larger than (needs gcc 4.4)"
+       range 0 8192
+       default 1024 if !64BIT
+       default 2048 if 64BIT
+       help
+         Tell gcc to warn at build time for stack frames larger than this.
+         Setting this too low will cause a lot of warnings.
+         Setting it to 0 disables the warning.
+         Requires gcc 4.4
+

 config MAGIC_SYSRQ
        bool "Magic SysRq key"
        depends on !UML
 config MAGIC_SYSRQ
        bool "Magic SysRq key"
        depends on !UML


@@ -63,6 +74,9 @@ config DEBUG_FS
          debugging files into.  Enable this option to be able to read and
          write to these files.
 
          debugging files into.  Enable this option to be able to read and
          write to these files.
 

+         For detailed documentation on the debugfs API, see
+         Documentation/DocBook/filesystems.
+

          If unsure, say N.
 
 config HEADERS_CHECK
          If unsure, say N.
 
 config HEADERS_CHECK


@@ -136,7 +150,7 @@ config DETECT_SOFTLOCKUP
        help
          Say Y here to enable the kernel to detect "soft lockups",
          which are bugs that cause the kernel to loop in kernel
        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
+         mode for more than 60 seconds, without giving other tasks a

          chance to run.
 
          When a soft-lockup is detected, the kernel will print the
          chance to run.
 
          When a soft-lockup is detected, the kernel will print the


@@ -148,6 +162,30 @@ config DETECT_SOFTLOCKUP
           can be detected via the NMI-watchdog, on platforms that
           support it.)
 
           can be detected via the NMI-watchdog, on platforms that
           support it.)
 

+config BOOTPARAM_SOFTLOCKUP_PANIC
+       bool "Panic (Reboot) On Soft Lockups"
+       depends on DETECT_SOFTLOCKUP
+       help
+         Say Y here to enable the kernel to panic on "soft lockups",
+         which are bugs that cause the kernel to loop in kernel
+         mode for more than 60 seconds, without giving other tasks a
+         chance to run.
+
+         The panic can be used in combination with panic_timeout,
+         to cause the system to reboot automatically after a
+         lockup has been detected. This feature is useful for
+         high-availability systems that have uptime guarantees and
+         where a lockup must be resolved ASAP.
+
+         Say N if unsure.
+
+config BOOTPARAM_SOFTLOCKUP_PANIC_VALUE
+       int
+       depends on DETECT_SOFTLOCKUP
+       range 0 1
+       default 0 if !BOOTPARAM_SOFTLOCKUP_PANIC
+       default 1 if BOOTPARAM_SOFTLOCKUP_PANIC
+

 config SCHED_DEBUG
        bool "Collect scheduler debugging info"
        depends on DEBUG_KERNEL && PROC_FS
 config SCHED_DEBUG
        bool "Collect scheduler debugging info"
        depends on DEBUG_KERNEL && PROC_FS


@@ -183,6 +221,37 @@ config TIMER_STATS
          (it defaults to deactivated on bootup and will only be activated
          if some application like powertop activates it explicitly).
 
          (it defaults to deactivated on bootup and will only be activated
          if some application like powertop activates it explicitly).
 

+config DEBUG_OBJECTS
+       bool "Debug object operations"
+       depends on DEBUG_KERNEL
+       help
+         If you say Y here, additional code will be inserted into the
+         kernel to track the life time of various objects and validate
+         the operations on those objects.
+
+config DEBUG_OBJECTS_SELFTEST
+       bool "Debug objects selftest"
+       depends on DEBUG_OBJECTS
+       help
+         This enables the selftest of the object debug code.
+
+config DEBUG_OBJECTS_FREE
+       bool "Debug objects in freed memory"
+       depends on DEBUG_OBJECTS
+       help
+         This enables checks whether a k/v free operation frees an area
+         which contains an object which has not been deactivated
+         properly. This can make kmalloc/kfree-intensive workloads
+         much slower.
+
+config DEBUG_OBJECTS_TIMERS
+       bool "Debug timer objects"
+       depends on DEBUG_OBJECTS
+       help
+         If you say Y here, additional code will be inserted into the
+         timer routines to track the life time of timer objects and
+         validate the timer operations.
+

 config DEBUG_SLAB
        bool "Debug slab memory allocations"
        depends on DEBUG_KERNEL && SLAB
 config DEBUG_SLAB
        bool "Debug slab memory allocations"
        depends on DEBUG_KERNEL && SLAB


@@ -211,7 +280,7 @@ config SLUB_DEBUG_ON
 config SLUB_STATS
        default n
        bool "Enable SLUB performance statistics"
 config SLUB_STATS
        default n
        bool "Enable SLUB performance statistics"

-       depends on SLUB
+       depends on SLUB && SLUB_DEBUG && SYSFS

        help
          SLUB statistics are useful to debug SLUBs allocation behavior in
          order find ways to optimize the allocator. This should never be
        help
          SLUB statistics are useful to debug SLUBs allocation behavior in
          order find ways to optimize the allocator. This should never be


@@ -325,7 +394,7 @@ config LOCKDEP
        bool
        depends on DEBUG_KERNEL && TRACE_IRQFLAGS_SUPPORT && STACKTRACE_SUPPORT && LOCKDEP_SUPPORT
        select STACKTRACE
        bool
        depends on DEBUG_KERNEL && TRACE_IRQFLAGS_SUPPORT && STACKTRACE_SUPPORT && LOCKDEP_SUPPORT
        select STACKTRACE

-       select FRAME_POINTER if !X86 && !MIPS
+       select FRAME_POINTER if !X86 && !MIPS && !PPC

        select KALLSYMS
        select KALLSYMS_ALL
 
        select KALLSYMS
        select KALLSYMS_ALL
 


@@ -377,7 +446,6 @@ config DEBUG_LOCKING_API_SELFTESTS
 
 config STACKTRACE
        bool
 
 config STACKTRACE
        bool

-       depends on DEBUG_KERNEL

        depends on STACKTRACE_SUPPORT
 
 config DEBUG_KOBJECT
        depends on STACKTRACE_SUPPORT
 
 config DEBUG_KOBJECT


@@ -427,6 +495,37 @@ config DEBUG_VM
 
          If unsure, say N.
 
 
          If unsure, say N.
 

+config DEBUG_VIRTUAL
+       bool "Debug VM translations"
+       depends on DEBUG_KERNEL && X86
+       help
+         Enable some costly sanity checks in virtual to page code. This can
+         catch mistakes with virt_to_page() and friends.
+
+         If unsure, say N.
+
+config DEBUG_WRITECOUNT
+       bool "Debug filesystem writers count"
+       depends on DEBUG_KERNEL
+       help
+         Enable this to catch wrong use of the writers count in struct
+         vfsmount.  This will increase the size of each file struct by
+         32 bits.
+
+         If unsure, say N.
+
+config DEBUG_MEMORY_INIT
+       bool "Debug memory initialisation" if EMBEDDED
+       default !EMBEDDED
+       help
+         Enable this for additional checks during memory initialisation.
+         The sanity checks verify aspects of the VM such as the memory model
+         and other information provided by the architecture. Verbose
+         information will be printed at KERN_DEBUG loglevel depending
+         on the mminit_loglevel= command-line option.
+
+         If unsure, say Y
+

 config DEBUG_LIST
        bool "Debug linked list manipulation"
        depends on DEBUG_KERNEL
 config DEBUG_LIST
        bool "Debug linked list manipulation"
        depends on DEBUG_KERNEL


@@ -479,16 +578,60 @@ config BOOT_PRINTK_DELAY
 config RCU_TORTURE_TEST
        tristate "torture tests for RCU"
        depends on DEBUG_KERNEL
 config RCU_TORTURE_TEST
        tristate "torture tests for RCU"
        depends on DEBUG_KERNEL

-       depends on m

        default n
        help
          This option provides a kernel module that runs torture tests
          on the RCU infrastructure.  The kernel module may be built
          after the fact on the running kernel to be tested, if desired.
 
        default n
        help
          This option provides a kernel module that runs torture tests
          on the RCU infrastructure.  The kernel module may be built
          after the fact on the running kernel to be tested, if desired.
 

+         Say Y here if you want RCU torture tests to be built into
+         the kernel.

          Say M if you want the RCU torture tests to build as a module.
          Say N if you are unsure.
 
          Say M if you want the RCU torture tests to build as a module.
          Say N if you are unsure.
 

+config RCU_TORTURE_TEST_RUNNABLE
+       bool "torture tests for RCU runnable by default"
+       depends on RCU_TORTURE_TEST = y
+       default n
+       help
+         This option provides a way to build the RCU torture tests
+         directly into the kernel without them starting up at boot
+         time.  You can use /proc/sys/kernel/rcutorture_runnable
+         to manually override this setting.  This /proc file is
+         available only when the RCU torture tests have been built
+         into the kernel.
+
+         Say Y here if you want the RCU torture tests to start during
+         boot (you probably don't).
+         Say N here if you want the RCU torture tests to start only
+         after being manually enabled via /proc.
+
+config RCU_CPU_STALL_DETECTOR
+       bool "Check for stalled CPUs delaying RCU grace periods"
+       depends on CLASSIC_RCU
+       default n
+       help
+         This option causes RCU to printk information on which
+         CPUs are delaying the current grace period, but only when
+         the grace period extends for excessive time periods.
+
+         Say Y if you want RCU to perform such checks.
+
+         Say N if you are unsure.
+
+config RCU_CPU_STALL_DETECTOR
+       bool "Check for stalled CPUs delaying RCU grace periods"
+       depends on CLASSIC_RCU || TREE_RCU
+       default n
+       help
+         This option causes RCU to printk information on which
+         CPUs are delaying the current grace period, but only when
+         the grace period extends for excessive time periods.
+
+         Say Y if you want RCU to perform such checks.
+
+         Say N if you are unsure.
+

 config KPROBES_SANITY_TEST
        bool "Kprobes sanity tests"
        depends on DEBUG_KERNEL
 config KPROBES_SANITY_TEST
        bool "Kprobes sanity tests"
        depends on DEBUG_KERNEL


@@ -511,6 +654,36 @@ config BACKTRACE_SELF_TEST
          for distributions or general kernels, but only for kernel
          developers working on architecture code.
 
          for distributions or general kernels, but only for kernel
          developers working on architecture code.
 

+         Note that if you want to also test saved backtraces, you will
+         have to enable STACKTRACE as well.
+
+         Say N if you are unsure.
+
+config DEBUG_BLOCK_EXT_DEVT
+        bool "Force extended block device numbers and spread them"
+       depends on DEBUG_KERNEL
+       depends on BLOCK
+       default n
+       help
+         BIG FAT WARNING: ENABLING THIS OPTION MIGHT BREAK BOOTING ON
+         SOME DISTRIBUTIONS.  DO NOT ENABLE THIS UNLESS YOU KNOW WHAT
+         YOU ARE DOING.  Distros, please enable this and fix whatever
+         is broken.
+
+         Conventionally, block device numbers are allocated from
+         predetermined contiguous area.  However, extended block area
+         may introduce non-contiguous block device numbers.  This
+         option forces most block device numbers to be allocated from
+         the extended space and spreads them to discover kernel or
+         userland code paths which assume predetermined contiguous
+         device number allocation.
+
+         Note that turning on this debug option shuffles all the
+         device numbers for all IDE and SCSI devices including libata
+         ones, so root partition specified using device number
+         directly (via rdev or root=MAJ:MIN) won't work anymore.
+         Textual device names (root=/dev/sdXn) will continue to work.
+

          Say N if you are unsure.
 
 config LKDTM
          Say N if you are unsure.
 
 config LKDTM


@@ -550,10 +723,21 @@ config FAIL_PAGE_ALLOC
 
 config FAIL_MAKE_REQUEST
        bool "Fault-injection capability for disk IO"
 
 config FAIL_MAKE_REQUEST
        bool "Fault-injection capability for disk IO"

-       depends on FAULT_INJECTION
+       depends on FAULT_INJECTION && BLOCK

        help
          Provide fault-injection capability for disk IO.
 
        help
          Provide fault-injection capability for disk IO.
 

+config FAIL_IO_TIMEOUT
+       bool "Faul-injection capability for faking disk interrupts"
+       depends on FAULT_INJECTION && BLOCK
+       help
+         Provide fault-injection capability on end IO handling. This
+         will make the block layer "forget" an interrupt as configured,
+         thus exercising the error handling.
+
+         Only works with drivers that use the generic timeout handling,
+         for others it wont do anything.
+

 config FAULT_INJECTION_DEBUG_FS
        bool "Debugfs entries for fault-injection capabilities"
        depends on FAULT_INJECTION && SYSFS && DEBUG_FS
 config FAULT_INJECTION_DEBUG_FS
        bool "Debugfs entries for fault-injection capabilities"
        depends on FAULT_INJECTION && SYSFS && DEBUG_FS


@@ -565,13 +749,13 @@ config FAULT_INJECTION_STACKTRACE_FILTER
        depends on FAULT_INJECTION_DEBUG_FS && STACKTRACE_SUPPORT
        depends on !X86_64
        select STACKTRACE
        depends on FAULT_INJECTION_DEBUG_FS && STACKTRACE_SUPPORT
        depends on !X86_64
        select STACKTRACE

-       select FRAME_POINTER
+       select FRAME_POINTER if !PPC

        help
          Provide stacktrace filter for fault-injection capabilities
 
 config LATENCYTOP
        bool "Latency measuring infrastructure"
        help
          Provide stacktrace filter for fault-injection capabilities
 
 config LATENCYTOP
        bool "Latency measuring infrastructure"

-       select FRAME_POINTER if !MIPS
+       select FRAME_POINTER if !MIPS && !PPC

        select KALLSYMS
        select KALLSYMS_ALL
        select STACKTRACE
        select KALLSYMS
        select KALLSYMS_ALL
        select STACKTRACE


@@ -582,8 +766,18 @@ config LATENCYTOP
          Enable this option if you want to use the LatencyTOP tool
          to find out which userspace is blocking on what kernel operations.
 
          Enable this option if you want to use the LatencyTOP tool
          to find out which userspace is blocking on what kernel operations.
 

+config SYSCTL_SYSCALL_CHECK
+       bool "Sysctl checks"
+       depends on SYSCTL_SYSCALL
+       ---help---
+         sys_sysctl uses binary paths that have been found challenging
+         to properly maintain and use. This enables checks that help
+         you to keep things correct.
+
+source kernel/trace/Kconfig
+

 config PROVIDE_OHCI1394_DMA_INIT
 config PROVIDE_OHCI1394_DMA_INIT

-       bool "Provide code for enabling DMA over FireWire early on boot"
+       bool "Remote debugging over FireWire early on boot"

        depends on PCI && X86
        help
          If you want to debug problems which hang or crash the kernel early
        depends on PCI && X86
        help
          If you want to debug problems which hang or crash the kernel early


@@ -611,4 +805,81 @@ config PROVIDE_OHCI1394_DMA_INIT
 
          See Documentation/debugging-via-ohci1394.txt for more information.
 
 
          See Documentation/debugging-via-ohci1394.txt for more information.
 

+config FIREWIRE_OHCI_REMOTE_DMA
+       bool "Remote debugging over FireWire with firewire-ohci"
+       depends on FIREWIRE_OHCI
+       help
+         This option lets you use the FireWire bus for remote debugging
+         with help of the firewire-ohci driver. It enables unfiltered
+         remote DMA in firewire-ohci.
+         See Documentation/debugging-via-ohci1394.txt for more information.
+
+         If unsure, say N.
+
+menuconfig BUILD_DOCSRC
+       bool "Build targets in Documentation/ tree"
+       depends on HEADERS_CHECK
+       help
+         This option attempts to build objects from the source files in the
+         kernel Documentation/ tree.
+
+         Say N if you are unsure.
+
+config DYNAMIC_PRINTK_DEBUG
+       bool "Enable dynamic printk() call support"
+       default n
+       depends on PRINTK
+       select PRINTK_DEBUG
+       help
+
+         Compiles debug level messages into the kernel, which would not
+         otherwise be available at runtime. These messages can then be
+         enabled/disabled on a per module basis. This mechanism implicitly
+         enables all pr_debug() and dev_dbg() calls. The impact of this
+         compile option is a larger kernel text size of about 2%.
+
+         Usage:
+
+         Dynamic debugging is controlled by the debugfs file,
+         dynamic_printk/modules. This file contains a list of the modules that
+         can be enabled. The format of the file is the module name, followed
+         by a set of flags that can be enabled. The first flag is always the
+         'enabled' flag. For example:
+
+               <module_name> <enabled=0/1>
+                               .
+                               .
+                               .
+
+         <module_name> : Name of the module in which the debug call resides
+         <enabled=0/1> : whether the messages are enabled or not
+
+         From a live system:
+
+               snd_hda_intel enabled=0
+               fixup enabled=0
+               driver enabled=0
+
+         Enable a module:
+
+               $echo "set enabled=1 <module_name>" > dynamic_printk/modules
+
+         Disable a module:
+
+               $echo "set enabled=0 <module_name>" > dynamic_printk/modules
+
+         Enable all modules:
+
+               $echo "set enabled=1 all" > dynamic_printk/modules
+
+         Disable all modules:
+
+               $echo "set enabled=0 all" > dynamic_printk/modules
+
+         Finally, passing "dynamic_printk" at the command line enables
+         debugging for all modules. This mode can be turned off via the above
+         disable command.
+

 source "samples/Kconfig"
 source "samples/Kconfig"

+
+source "lib/Kconfig.kgdb"