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7c0b49f9d1
Deliberate register clobber around performance critical inline code is great for testing, bad to leave on by default. Many people ship with DEBUG_KERNEL turned on, so stop making DEBUG_PARAVIRT default on. Signed-off-by: Zachary Amsden <zach@vmware.com> Signed-off-by: Andi Kleen <ak@suse.de>
99 lines
3.1 KiB
Plaintext
99 lines
3.1 KiB
Plaintext
menu "Kernel hacking"
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config TRACE_IRQFLAGS_SUPPORT
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bool
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default y
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source "lib/Kconfig.debug"
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config EARLY_PRINTK
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bool "Early printk" if EMBEDDED && DEBUG_KERNEL
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default y
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help
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Write kernel log output directly into the VGA buffer or to a serial
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port.
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This is useful for kernel debugging when your machine crashes very
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early before the console code is initialized. For normal operation
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it is not recommended because it looks ugly and doesn't cooperate
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with klogd/syslogd or the X server. You should normally N here,
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unless you want to debug such a crash.
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config DEBUG_STACKOVERFLOW
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bool "Check for stack overflows"
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depends on DEBUG_KERNEL
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help
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This option will cause messages to be printed if free stack space
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drops below a certain limit.
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config DEBUG_STACK_USAGE
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bool "Stack utilization instrumentation"
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depends on DEBUG_KERNEL
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help
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Enables the display of the minimum amount of free stack which each
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task has ever had available in the sysrq-T and sysrq-P debug output.
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This option will slow down process creation somewhat.
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comment "Page alloc debug is incompatible with Software Suspend on i386"
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depends on DEBUG_KERNEL && SOFTWARE_SUSPEND
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config DEBUG_PAGEALLOC
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bool "Debug page memory allocations"
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depends on DEBUG_KERNEL && !SOFTWARE_SUSPEND && !HUGETLBFS
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help
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Unmap pages from the kernel linear mapping after free_pages().
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This results in a large slowdown, but helps to find certain types
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of memory corruptions.
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config DEBUG_RODATA
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bool "Write protect kernel read-only data structures"
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depends on DEBUG_KERNEL
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help
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Mark the kernel read-only data as write-protected in the pagetables,
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in order to catch accidental (and incorrect) writes to such const
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data. This option may have a slight performance impact because a
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portion of the kernel code won't be covered by a 2MB TLB anymore.
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If in doubt, say "N".
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config 4KSTACKS
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bool "Use 4Kb for kernel stacks instead of 8Kb"
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depends on DEBUG_KERNEL
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help
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If you say Y here the kernel will use a 4Kb stacksize for the
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kernel stack attached to each process/thread. This facilitates
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running more threads on a system and also reduces the pressure
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on the VM subsystem for higher order allocations. This option
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will also use IRQ stacks to compensate for the reduced stackspace.
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config X86_FIND_SMP_CONFIG
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bool
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depends on X86_LOCAL_APIC || X86_VOYAGER
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default y
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config X86_MPPARSE
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bool
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depends on X86_LOCAL_APIC && !X86_VISWS
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default y
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config DOUBLEFAULT
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default y
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bool "Enable doublefault exception handler" if EMBEDDED
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help
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This option allows trapping of rare doublefault exceptions that
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would otherwise cause a system to silently reboot. Disabling this
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option saves about 4k and might cause you much additional grey
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hair.
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config DEBUG_PARAVIRT
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bool "Enable some paravirtualization debugging"
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default n
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depends on PARAVIRT && DEBUG_KERNEL
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help
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Currently deliberately clobbers regs which are allowed to be
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clobbered in inlined paravirt hooks, even in native mode.
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If turning this off solves a problem, then DISABLE_INTERRUPTS() or
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ENABLE_INTERRUPTS() is lying about what registers can be clobbered.
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endmenu
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