forked from Minki/linux
4bdc3b7f1b
This patch puts the infrastructure in place to allow for a reordering of functions based inside the vmlinux. The general idea is that it is possible to put all "common" functions into the first 2Mb of the code, so that they are covered by one TLB entry. This as opposed to the current situation where a typical vmlinux covers about 3.5Mb (on x86-64) and thus 2 TLB entries. This is done by enabling the -ffunction-sections flag in gcc, which puts each function in its own ELF section, so that the linker can then order them in a way defined by the linker script. As per previous discussions, Linus said he wanted a "static" list for this, eg a list provided by the kernel tarbal, so that most people have the same ordering at least. A script is provided to create this list based on readprofile(1) output. The included list is provisional, and entirely biased on my own testbox and me running a few kernel compiles and some other things. I think that to get to a better list we need to invite people to submit their own profiles, and somehow add those all up and base the final list on that. I'm willing to do that effort if this is ends up being the prefered approach. Such an effort probably needs to be repeated like once a year or so to adopt to the changing nature of the kernel. Made it a CONFIG with default n because it increases link times dramatically. Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
604 lines
15 KiB
Plaintext
604 lines
15 KiB
Plaintext
#
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# For a description of the syntax of this configuration file,
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# see Documentation/kbuild/kconfig-language.txt.
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#
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# Note: ISA is disabled and will hopefully never be enabled.
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# If you managed to buy an ISA x86-64 box you'll have to fix all the
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# ISA drivers you need yourself.
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#
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mainmenu "Linux Kernel Configuration"
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config X86_64
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bool
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default y
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help
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Port to the x86-64 architecture. x86-64 is a 64-bit extension to the
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classical 32-bit x86 architecture. For details see
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<http://www.x86-64.org/>.
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config 64BIT
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def_bool y
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config X86
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bool
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default y
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config SEMAPHORE_SLEEPERS
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bool
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default y
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config MMU
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bool
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default y
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config ISA
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bool
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config SBUS
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bool
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config RWSEM_GENERIC_SPINLOCK
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bool
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default y
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config RWSEM_XCHGADD_ALGORITHM
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bool
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config GENERIC_CALIBRATE_DELAY
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bool
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default y
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config X86_CMPXCHG
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bool
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default y
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config EARLY_PRINTK
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bool
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default y
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config GENERIC_ISA_DMA
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bool
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default y
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config GENERIC_IOMAP
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bool
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default y
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config ARCH_MAY_HAVE_PC_FDC
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bool
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default y
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config DMI
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bool
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default y
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source "init/Kconfig"
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menu "Processor type and features"
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choice
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prompt "Subarchitecture Type"
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default X86_PC
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config X86_PC
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bool "PC-compatible"
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help
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Choose this option if your computer is a standard PC or compatible.
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config X86_VSMP
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bool "Support for ScaleMP vSMP"
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help
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Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is
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supposed to run on these EM64T-based machines. Only choose this option
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if you have one of these machines.
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endchoice
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choice
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prompt "Processor family"
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default MK8
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config MK8
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bool "AMD-Opteron/Athlon64"
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help
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Optimize for AMD Opteron/Athlon64/Hammer/K8 CPUs.
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config MPSC
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bool "Intel EM64T"
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help
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Optimize for Intel Pentium 4 and Xeon CPUs with Intel
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Extended Memory 64 Technology(EM64T). For details see
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<http://www.intel.com/technology/64bitextensions/>.
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config GENERIC_CPU
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bool "Generic-x86-64"
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help
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Generic x86-64 CPU.
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endchoice
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#
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# Define implied options from the CPU selection here
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#
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config X86_L1_CACHE_BYTES
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int
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default "128" if GENERIC_CPU || MPSC
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default "64" if MK8
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config X86_L1_CACHE_SHIFT
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int
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default "7" if GENERIC_CPU || MPSC
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default "6" if MK8
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config X86_TSC
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bool
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default y
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config X86_GOOD_APIC
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bool
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default y
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config MICROCODE
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tristate "/dev/cpu/microcode - Intel CPU microcode support"
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---help---
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If you say Y here the 'File systems' section, you will be
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able to update the microcode on Intel processors. You will
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obviously need the actual microcode binary data itself which is
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not shipped with the Linux kernel.
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For latest news and information on obtaining all the required
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ingredients for this driver, check:
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<http://www.urbanmyth.org/microcode/>.
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To compile this driver as a module, choose M here: the
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module will be called microcode.
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If you use modprobe or kmod you may also want to add the line
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'alias char-major-10-184 microcode' to your /etc/modules.conf file.
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config X86_MSR
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tristate "/dev/cpu/*/msr - Model-specific register support"
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help
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This device gives privileged processes access to the x86
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Model-Specific Registers (MSRs). It is a character device with
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major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
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MSR accesses are directed to a specific CPU on multi-processor
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systems.
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config X86_CPUID
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tristate "/dev/cpu/*/cpuid - CPU information support"
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help
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This device gives processes access to the x86 CPUID instruction to
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be executed on a specific processor. It is a character device
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with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
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/dev/cpu/31/cpuid.
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config X86_HT
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bool
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depends on SMP && !MK8
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default y
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config MATH_EMULATION
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bool
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config MCA
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bool
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config EISA
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bool
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config X86_IO_APIC
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bool
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default y
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config X86_LOCAL_APIC
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bool
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default y
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config MTRR
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bool "MTRR (Memory Type Range Register) support"
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---help---
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On Intel P6 family processors (Pentium Pro, Pentium II and later)
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the Memory Type Range Registers (MTRRs) may be used to control
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processor access to memory ranges. This is most useful if you have
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a video (VGA) card on a PCI or AGP bus. Enabling write-combining
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allows bus write transfers to be combined into a larger transfer
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before bursting over the PCI/AGP bus. This can increase performance
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of image write operations 2.5 times or more. Saying Y here creates a
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/proc/mtrr file which may be used to manipulate your processor's
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MTRRs. Typically the X server should use this.
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This code has a reasonably generic interface so that similar
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control registers on other processors can be easily supported
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as well.
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Saying Y here also fixes a problem with buggy SMP BIOSes which only
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set the MTRRs for the boot CPU and not for the secondary CPUs. This
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can lead to all sorts of problems, so it's good to say Y here.
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Just say Y here, all x86-64 machines support MTRRs.
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See <file:Documentation/mtrr.txt> for more information.
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config SMP
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bool "Symmetric multi-processing support"
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---help---
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This enables support for systems with more than one CPU. If you have
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a system with only one CPU, like most personal computers, say N. If
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you have a system with more than one CPU, say Y.
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If you say N here, the kernel will run on single and multiprocessor
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machines, but will use only one CPU of a multiprocessor machine. If
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you say Y here, the kernel will run on many, but not all,
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singleprocessor machines. On a singleprocessor machine, the kernel
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will run faster if you say N here.
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If you don't know what to do here, say N.
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config SCHED_SMT
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bool "SMT (Hyperthreading) scheduler support"
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depends on SMP
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default n
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help
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SMT scheduler support improves the CPU scheduler's decision making
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when dealing with Intel Pentium 4 chips with HyperThreading at a
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cost of slightly increased overhead in some places. If unsure say
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N here.
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source "kernel/Kconfig.preempt"
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config NUMA
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bool "Non Uniform Memory Access (NUMA) Support"
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depends on SMP
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help
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Enable NUMA (Non Uniform Memory Access) support. The kernel
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will try to allocate memory used by a CPU on the local memory
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controller of the CPU and add some more NUMA awareness to the kernel.
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This code is recommended on all multiprocessor Opteron systems.
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If the system is EM64T, you should say N unless your system is EM64T
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NUMA.
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config K8_NUMA
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bool "Old style AMD Opteron NUMA detection"
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depends on NUMA
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default y
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help
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Enable K8 NUMA node topology detection. You should say Y here if
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you have a multi processor AMD K8 system. This uses an old
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method to read the NUMA configurtion directly from the builtin
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Northbridge of Opteron. It is recommended to use X86_64_ACPI_NUMA
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instead, which also takes priority if both are compiled in.
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# Dummy CONFIG option to select ACPI_NUMA from drivers/acpi/Kconfig.
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config X86_64_ACPI_NUMA
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bool "ACPI NUMA detection"
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depends on NUMA
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select ACPI
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select ACPI_NUMA
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default y
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help
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Enable ACPI SRAT based node topology detection.
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config NUMA_EMU
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bool "NUMA emulation"
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depends on NUMA
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help
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Enable NUMA emulation. A flat machine will be split
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into virtual nodes when booted with "numa=fake=N", where N is the
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number of nodes. This is only useful for debugging.
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config ARCH_DISCONTIGMEM_ENABLE
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bool
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depends on NUMA
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default y
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config ARCH_DISCONTIGMEM_ENABLE
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def_bool y
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depends on NUMA
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config ARCH_DISCONTIGMEM_DEFAULT
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def_bool y
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depends on NUMA
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config ARCH_SPARSEMEM_ENABLE
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def_bool y
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depends on (NUMA || EXPERIMENTAL)
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config ARCH_MEMORY_PROBE
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def_bool y
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depends on MEMORY_HOTPLUG
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config ARCH_FLATMEM_ENABLE
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def_bool y
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depends on !NUMA
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source "mm/Kconfig"
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config HAVE_ARCH_EARLY_PFN_TO_NID
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def_bool y
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depends on NUMA
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config NR_CPUS
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int "Maximum number of CPUs (2-256)"
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range 2 256
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depends on SMP
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default "8"
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help
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This allows you to specify the maximum number of CPUs which this
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kernel will support. Current maximum is 256 CPUs due to
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APIC addressing limits. Less depending on the hardware.
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This is purely to save memory - each supported CPU requires
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memory in the static kernel configuration.
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config HOTPLUG_CPU
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bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
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depends on SMP && HOTPLUG && EXPERIMENTAL
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help
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Say Y here to experiment with turning CPUs off and on. CPUs
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can be controlled through /sys/devices/system/cpu/cpu#.
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Say N if you want to disable CPU hotplug.
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config HPET_TIMER
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bool
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default y
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help
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Use the IA-PC HPET (High Precision Event Timer) to manage
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time in preference to the PIT and RTC, if a HPET is
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present. The HPET provides a stable time base on SMP
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systems, unlike the TSC, but it is more expensive to access,
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as it is off-chip. You can find the HPET spec at
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<http://www.intel.com/hardwaredesign/hpetspec.htm>.
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config HPET_EMULATE_RTC
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bool "Provide RTC interrupt"
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depends on HPET_TIMER && RTC=y
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config GART_IOMMU
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bool "K8 GART IOMMU support"
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default y
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select SWIOTLB
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depends on PCI
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help
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Support the IOMMU. Needed to run systems with more than 3GB of memory
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properly with 32-bit PCI devices that do not support DAC (Double Address
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Cycle). The IOMMU can be turned off at runtime with the iommu=off parameter.
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Normally the kernel will take the right choice by itself.
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This option includes a driver for the AMD Opteron/Athlon64 northbridge IOMMU
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and a software emulation used on other systems.
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If unsure, say Y.
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# need this always enabled with GART_IOMMU for the VIA workaround
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config SWIOTLB
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bool
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default y
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depends on GART_IOMMU
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config X86_MCE
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bool "Machine check support" if EMBEDDED
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default y
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help
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Include a machine check error handler to report hardware errors.
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This version will require the mcelog utility to decode some
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machine check error logs. See
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ftp://ftp.x86-64.org/pub/linux/tools/mcelog
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config X86_MCE_INTEL
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bool "Intel MCE features"
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depends on X86_MCE && X86_LOCAL_APIC
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default y
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help
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Additional support for intel specific MCE features such as
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the thermal monitor.
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config X86_MCE_AMD
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bool "AMD MCE features"
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depends on X86_MCE && X86_LOCAL_APIC
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default y
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help
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Additional support for AMD specific MCE features such as
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the DRAM Error Threshold.
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config KEXEC
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bool "kexec system call (EXPERIMENTAL)"
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depends on EXPERIMENTAL
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help
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kexec is a system call that implements the ability to shutdown your
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current kernel, and to start another kernel. It is like a reboot
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but it is indepedent of the system firmware. And like a reboot
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you can start any kernel with it, not just Linux.
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The name comes from the similiarity to the exec system call.
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It is an ongoing process to be certain the hardware in a machine
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is properly shutdown, so do not be surprised if this code does not
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initially work for you. It may help to enable device hotplugging
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support. As of this writing the exact hardware interface is
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strongly in flux, so no good recommendation can be made.
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config CRASH_DUMP
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bool "kernel crash dumps (EXPERIMENTAL)"
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depends on EXPERIMENTAL
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help
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Generate crash dump after being started by kexec.
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config PHYSICAL_START
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hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP)
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default "0x1000000" if CRASH_DUMP
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default "0x200000"
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help
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This gives the physical address where the kernel is loaded. Normally
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for regular kernels this value is 0x200000 (2MB). But in the case
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of kexec on panic the fail safe kernel needs to run at a different
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address than the panic-ed kernel. This option is used to set the load
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address for kernels used to capture crash dump on being kexec'ed
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after panic. The default value for crash dump kernels is
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0x1000000 (16MB). This can also be set based on the "X" value as
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specified in the "crashkernel=YM@XM" command line boot parameter
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passed to the panic-ed kernel. Typically this parameter is set as
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crashkernel=64M@16M. Please take a look at
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Documentation/kdump/kdump.txt for more details about crash dumps.
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Don't change this unless you know what you are doing.
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config SECCOMP
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bool "Enable seccomp to safely compute untrusted bytecode"
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depends on PROC_FS
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default y
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help
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This kernel feature is useful for number crunching applications
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that may need to compute untrusted bytecode during their
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execution. By using pipes or other transports made available to
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the process as file descriptors supporting the read/write
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syscalls, it's possible to isolate those applications in
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their own address space using seccomp. Once seccomp is
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enabled via /proc/<pid>/seccomp, it cannot be disabled
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and the task is only allowed to execute a few safe syscalls
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defined by each seccomp mode.
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If unsure, say Y. Only embedded should say N here.
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source kernel/Kconfig.hz
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config REORDER
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bool "Function reordering"
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default n
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help
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This option enables the toolchain to reorder functions for a more
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optimal TLB usage. If you have pretty much any version of binutils,
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this can increase your kernel build time by roughly one minute.
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endmenu
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#
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# Use the generic interrupt handling code in kernel/irq/:
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#
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config GENERIC_HARDIRQS
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bool
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default y
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config GENERIC_IRQ_PROBE
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bool
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default y
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# we have no ISA slots, but we do have ISA-style DMA.
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config ISA_DMA_API
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bool
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default y
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config GENERIC_PENDING_IRQ
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bool
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depends on GENERIC_HARDIRQS && SMP
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default y
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menu "Power management options"
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source kernel/power/Kconfig
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source "drivers/acpi/Kconfig"
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source "arch/x86_64/kernel/cpufreq/Kconfig"
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endmenu
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menu "Bus options (PCI etc.)"
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config PCI
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bool "PCI support"
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# x86-64 doesn't support PCI BIOS access from long mode so always go direct.
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config PCI_DIRECT
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bool
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depends on PCI
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default y
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config PCI_MMCONFIG
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bool "Support mmconfig PCI config space access"
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depends on PCI && ACPI
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config UNORDERED_IO
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bool "Unordered IO mapping access"
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depends on EXPERIMENTAL
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help
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Use unordered stores to access IO memory mappings in device drivers.
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Still very experimental. When a driver works on IA64/ppc64/pa-risc it should
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work with this option, but it makes the drivers behave differently
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from i386. Requires that the driver writer used memory barriers
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properly.
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source "drivers/pci/pcie/Kconfig"
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source "drivers/pci/Kconfig"
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source "drivers/pcmcia/Kconfig"
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source "drivers/pci/hotplug/Kconfig"
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endmenu
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menu "Executable file formats / Emulations"
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source "fs/Kconfig.binfmt"
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config IA32_EMULATION
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bool "IA32 Emulation"
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help
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Include code to run 32-bit programs under a 64-bit kernel. You should likely
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turn this on, unless you're 100% sure that you don't have any 32-bit programs
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left.
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config IA32_AOUT
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tristate "IA32 a.out support"
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depends on IA32_EMULATION
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help
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Support old a.out binaries in the 32bit emulation.
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config COMPAT
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bool
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depends on IA32_EMULATION
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default y
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config SYSVIPC_COMPAT
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bool
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depends on COMPAT && SYSVIPC
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default y
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endmenu
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source "net/Kconfig"
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source drivers/Kconfig
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source "drivers/firmware/Kconfig"
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source fs/Kconfig
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menu "Instrumentation Support"
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depends on EXPERIMENTAL
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source "arch/x86_64/oprofile/Kconfig"
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config KPROBES
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bool "Kprobes (EXPERIMENTAL)"
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depends on EXPERIMENTAL && MODULES
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|
help
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|
Kprobes allows you to trap at almost any kernel address and
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execute a callback function. register_kprobe() establishes
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a probepoint and specifies the callback. Kprobes is useful
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for kernel debugging, non-intrusive instrumentation and testing.
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If in doubt, say "N".
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endmenu
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source "arch/x86_64/Kconfig.debug"
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source "security/Kconfig"
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source "crypto/Kconfig"
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source "lib/Kconfig"
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