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kernel-ark/arch/ia64/Kconfig
Matt Helsley dc52ddc0e6 container freezer: implement freezer cgroup subsystem 
This patch implements a new freezer subsystem in the control groups
framework.  It provides a way to stop and resume execution of all tasks in
a cgroup by writing in the cgroup filesystem.

The freezer subsystem in the container filesystem defines a file named
freezer.state.  Writing "FROZEN" to the state file will freeze all tasks
in the cgroup.  Subsequently writing "RUNNING" will unfreeze the tasks in
the cgroup.  Reading will return the current state.

* Examples of usage :

   # mkdir /containers/freezer
   # mount -t cgroup -ofreezer freezer  /containers
   # mkdir /containers/0
   # echo $some_pid > /containers/0/tasks

to get status of the freezer subsystem :

   # cat /containers/0/freezer.state
   RUNNING

to freeze all tasks in the container :

   # echo FROZEN > /containers/0/freezer.state
   # cat /containers/0/freezer.state
   FREEZING
   # cat /containers/0/freezer.state
   FROZEN

to unfreeze all tasks in the container :

   # echo RUNNING > /containers/0/freezer.state
   # cat /containers/0/freezer.state
   RUNNING

This is the basic mechanism which should do the right thing for user space
task in a simple scenario.

It's important to note that freezing can be incomplete.  In that case we
return EBUSY.  This means that some tasks in the cgroup are busy doing
something that prevents us from completely freezing the cgroup at this
time.  After EBUSY, the cgroup will remain partially frozen -- reflected
by freezer.state reporting "FREEZING" when read.  The state will remain
"FREEZING" until one of these things happens:

	1) Userspace cancels the freezing operation by writing "RUNNING" to
		the freezer.state file
	2) Userspace retries the freezing operation by writing "FROZEN" to
		the freezer.state file (writing "FREEZING" is not legal
		and returns EIO)
	3) The tasks that blocked the cgroup from entering the "FROZEN"
		state disappear from the cgroup's set of tasks.

[akpm@linux-foundation.org: coding-style fixes]
[akpm@linux-foundation.org: export thaw_process]
Signed-off-by: Cedric Le Goater <clg@fr.ibm.com>
Signed-off-by: Matt Helsley <matthltc@us.ibm.com>
Acked-by: Serge E. Hallyn <serue@us.ibm.com>
Tested-by: Matt Helsley <matthltc@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-10-20 08:52:34 -07:00

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#
# For a description of the syntax of this configuration file,
# see Documentation/kbuild/kconfig-language.txt.
#
mainmenu "IA-64 Linux Kernel Configuration"
source "init/Kconfig"
source "kernel/Kconfig.freezer"
menu "Processor type and features"
config IA64
bool
select PCI if (!IA64_HP_SIM)
select ACPI if (!IA64_HP_SIM)
select PM if (!IA64_HP_SIM)
select ARCH_SUPPORTS_MSI
select HAVE_IDE
select HAVE_OPROFILE
select HAVE_KPROBES
select HAVE_KRETPROBES
select HAVE_DMA_ATTRS
select HAVE_KVM
default y
help
The Itanium Processor Family is Intel's 64-bit successor to
the 32-bit X86 line. The IA-64 Linux project has a home
page at <http://www.linuxia64.org/> and a mailing list at
<linux-ia64@vger.kernel.org>.
config 64BIT
bool
select ATA_NONSTANDARD if ATA
default y
config ZONE_DMA
def_bool y
depends on !IA64_SGI_SN2
config QUICKLIST
bool
default y
config MMU
bool
default y
config SWIOTLB
bool
config IOMMU_HELPER
bool
config GENERIC_LOCKBREAK
bool
default y
depends on SMP && PREEMPT
config RWSEM_XCHGADD_ALGORITHM
bool
default y
config HUGETLB_PAGE_SIZE_VARIABLE
bool
depends on HUGETLB_PAGE
default y
config GENERIC_FIND_NEXT_BIT
bool
default y
config GENERIC_CALIBRATE_DELAY
bool
default y
config GENERIC_TIME
bool
default y
config GENERIC_TIME_VSYSCALL
bool
default y
config HAVE_SETUP_PER_CPU_AREA
def_bool y
config DMI
bool
default y
config EFI
bool
default y
config GENERIC_IOMAP
bool
default y
config SCHED_NO_NO_OMIT_FRAME_POINTER
bool
default y
config IA64_UNCACHED_ALLOCATOR
bool
select GENERIC_ALLOCATOR
config AUDIT_ARCH
bool
default y
choice
prompt "System type"
default IA64_GENERIC
config IA64_GENERIC
bool "generic"
select NUMA
select ACPI_NUMA
select SWIOTLB
help
This selects the system type of your hardware. A "generic" kernel
will run on any supported IA-64 system. However, if you configure
a kernel for your specific system, it will be faster and smaller.
generic For any supported IA-64 system
DIG-compliant For DIG ("Developer's Interface Guide") compliant systems
HP-zx1/sx1000 For HP systems
HP-zx1/sx1000+swiotlb For HP systems with (broken) DMA-constrained devices.
SGI-SN2 For SGI Altix systems
SGI-UV For SGI UV systems
Ski-simulator For the HP simulator <http://www.hpl.hp.com/research/linux/ski/>
If you don't know what to do, choose "generic".
config IA64_DIG
bool "DIG-compliant"
select SWIOTLB
config IA64_HP_ZX1
bool "HP-zx1/sx1000"
help
Build a kernel that runs on HP zx1 and sx1000 systems. This adds
support for the HP I/O MMU.
config IA64_HP_ZX1_SWIOTLB
bool "HP-zx1/sx1000 with software I/O TLB"
select SWIOTLB
help
Build a kernel that runs on HP zx1 and sx1000 systems even when they
have broken PCI devices which cannot DMA to full 32 bits. Apart
from support for the HP I/O MMU, this includes support for the software
I/O TLB, which allows supporting the broken devices at the expense of
wasting some kernel memory (about 2MB by default).
config IA64_SGI_SN2
bool "SGI-SN2"
select NUMA
select ACPI_NUMA
help
Selecting this option will optimize the kernel for use on sn2 based
systems, but the resulting kernel binary will not run on other
types of ia64 systems. If you have an SGI Altix system, it's safe
to select this option. If in doubt, select ia64 generic support
instead.
config IA64_SGI_UV
bool "SGI-UV"
select NUMA
select ACPI_NUMA
select SWIOTLB
help
Selecting this option will optimize the kernel for use on UV based
systems, but the resulting kernel binary will not run on other
types of ia64 systems. If you have an SGI UV system, it's safe
to select this option. If in doubt, select ia64 generic support
instead.
config IA64_HP_SIM
bool "Ski-simulator"
select SWIOTLB
endchoice
choice
prompt "Processor type"
default ITANIUM
config ITANIUM
bool "Itanium"
help
Select your IA-64 processor type. The default is Itanium.
This choice is safe for all IA-64 systems, but may not perform
optimally on systems with, say, Itanium 2 or newer processors.
config MCKINLEY
bool "Itanium 2"
help
Select this to configure for an Itanium 2 (McKinley) processor.
endchoice
choice
prompt "Kernel page size"
default IA64_PAGE_SIZE_16KB
config IA64_PAGE_SIZE_4KB
bool "4KB"
help
This lets you select the page size of the kernel. For best IA-64
performance, a page size of 8KB or 16KB is recommended. For best
IA-32 compatibility, a page size of 4KB should be selected (the vast
majority of IA-32 binaries work perfectly fine with a larger page
size). For Itanium 2 or newer systems, a page size of 64KB can also
be selected.
4KB For best IA-32 compatibility
8KB For best IA-64 performance
16KB For best IA-64 performance
64KB Requires Itanium 2 or newer processor.
If you don't know what to do, choose 16KB.
config IA64_PAGE_SIZE_8KB
bool "8KB"
config IA64_PAGE_SIZE_16KB
bool "16KB"
config IA64_PAGE_SIZE_64KB
depends on !ITANIUM
bool "64KB"
endchoice
choice
prompt "Page Table Levels"
default PGTABLE_3
config PGTABLE_3
bool "3 Levels"
config PGTABLE_4
depends on !IA64_PAGE_SIZE_64KB
bool "4 Levels"
endchoice
if IA64_HP_SIM
config HZ
default 32
endif
if !IA64_HP_SIM
source kernel/Kconfig.hz
endif
config IA64_BRL_EMU
bool
depends on ITANIUM
default y
# align cache-sensitive data to 128 bytes
config IA64_L1_CACHE_SHIFT
int
default "7" if MCKINLEY
default "6" if ITANIUM
config IA64_CYCLONE
bool "Cyclone (EXA) Time Source support"
help
Say Y here to enable support for IBM EXA Cyclone time source.
If you're unsure, answer N.
config IOSAPIC
bool
depends on !IA64_HP_SIM
default y
config FORCE_MAX_ZONEORDER
int "MAX_ORDER (11 - 17)" if !HUGETLB_PAGE
range 11 17 if !HUGETLB_PAGE
default "17" if HUGETLB_PAGE
default "11"
config VIRT_CPU_ACCOUNTING
bool "Deterministic task and CPU time accounting"
default n
help
Select this option to enable more accurate task and CPU time
accounting. This is done by reading a CPU counter on each
kernel entry and exit and on transitions within the kernel
between system, softirq and hardirq state, so there is a
small performance impact.
If in doubt, say N here.
config SMP
bool "Symmetric multi-processing support"
select USE_GENERIC_SMP_HELPERS
help
This enables support for systems with more than one CPU. If you have
a system with only one CPU, say N. If you have a system with more
than one CPU, say Y.
If you say N here, the kernel will run on single and multiprocessor
systems, but will use only one CPU of a multiprocessor system. If
you say Y here, the kernel will run on many, but not all,
single processor systems. On a single processor system, the kernel
will run faster if you say N here.
See also the SMP-HOWTO available at
<http://www.tldp.org/docs.html#howto>.
If you don't know what to do here, say N.
config NR_CPUS
int "Maximum number of CPUs (2-4096)"
range 2 4096
depends on SMP
default "4096"
help
You should set this to the number of CPUs in your system, but
keep in mind that a kernel compiled for, e.g., 2 CPUs will boot but
only use 2 CPUs on a >2 CPU system. Setting this to a value larger
than 64 will cause the use of a CPU mask array, causing a small
performance hit.
config HOTPLUG_CPU
bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
depends on SMP && EXPERIMENTAL
select HOTPLUG
default n
---help---
Say Y here to experiment with turning CPUs off and on. CPUs
can be controlled through /sys/devices/system/cpu/cpu#.
Say N if you want to disable CPU hotplug.
config ARCH_ENABLE_MEMORY_HOTPLUG
def_bool y
config ARCH_ENABLE_MEMORY_HOTREMOVE
def_bool y
config SCHED_SMT
bool "SMT scheduler support"
depends on SMP
help
Improves the CPU scheduler's decision making when dealing with
Intel IA64 chips with MultiThreading at a cost of slightly increased
overhead in some places. If unsure say N here.
config PERMIT_BSP_REMOVE
bool "Support removal of Bootstrap Processor"
depends on HOTPLUG_CPU
default n
---help---
Say Y here if your platform SAL will support removal of BSP with HOTPLUG_CPU
support.
config FORCE_CPEI_RETARGET
bool "Force assumption that CPEI can be re-targetted"
depends on PERMIT_BSP_REMOVE
default n
---help---
Say Y if you need to force the assumption that CPEI can be re-targetted to
any cpu in the system. This hint is available via ACPI 3.0 specifications.
Tiger4 systems are capable of re-directing CPEI to any CPU other than BSP.
This option it useful to enable this feature on older BIOS's as well.
You can also enable this by using boot command line option force_cpei=1.
source "kernel/Kconfig.preempt"
source "mm/Kconfig"
config ARCH_SELECT_MEMORY_MODEL
def_bool y
config ARCH_DISCONTIGMEM_ENABLE
def_bool y
help
Say Y to support efficient handling of discontiguous physical memory,
for architectures which are either NUMA (Non-Uniform Memory Access)
or have huge holes in the physical address space for other reasons.
See <file:Documentation/vm/numa> for more.
config ARCH_FLATMEM_ENABLE
def_bool y
config ARCH_SPARSEMEM_ENABLE
def_bool y
depends on ARCH_DISCONTIGMEM_ENABLE
select SPARSEMEM_VMEMMAP_ENABLE
config ARCH_DISCONTIGMEM_DEFAULT
def_bool y if (IA64_SGI_SN2 || IA64_GENERIC || IA64_HP_ZX1 || IA64_HP_ZX1_SWIOTLB)
depends on ARCH_DISCONTIGMEM_ENABLE
config NUMA
bool "NUMA support"
depends on !IA64_HP_SIM && !FLATMEM
default y if IA64_SGI_SN2
select ACPI_NUMA if ACPI
help
Say Y to compile the kernel to support NUMA (Non-Uniform Memory
Access). This option is for configuring high-end multiprocessor
server systems. If in doubt, say N.
config NODES_SHIFT
int "Max num nodes shift(3-10)"
range 3 10
default "10"
depends on NEED_MULTIPLE_NODES
help
This option specifies the maximum number of nodes in your SSI system.
MAX_NUMNODES will be 2^(This value).
If in doubt, use the default.
config ARCH_POPULATES_NODE_MAP
def_bool y
# VIRTUAL_MEM_MAP and FLAT_NODE_MEM_MAP are functionally equivalent.
# VIRTUAL_MEM_MAP has been retained for historical reasons.
config VIRTUAL_MEM_MAP
bool "Virtual mem map"
depends on !SPARSEMEM
default y if !IA64_HP_SIM
help
Say Y to compile the kernel with support for a virtual mem map.
This code also only takes effect if a memory hole of greater than
1 Gb is found during boot. You must turn this option on if you
require the DISCONTIGMEM option for your machine. If you are
unsure, say Y.
config HOLES_IN_ZONE
bool
default y if VIRTUAL_MEM_MAP
config HAVE_ARCH_EARLY_PFN_TO_NID
def_bool y
depends on NEED_MULTIPLE_NODES
config HAVE_ARCH_NODEDATA_EXTENSION
def_bool y
depends on NUMA
config IA32_SUPPORT
bool "Support for Linux/x86 binaries"
help
IA-64 processors can execute IA-32 (X86) instructions. By
saying Y here, the kernel will include IA-32 system call
emulation support which makes it possible to transparently
run IA-32 Linux binaries on an IA-64 Linux system.
If in doubt, say Y.
config COMPAT
bool
depends on IA32_SUPPORT
default y
config COMPAT_FOR_U64_ALIGNMENT
def_bool COMPAT
config IA64_MCA_RECOVERY
tristate "MCA recovery from errors other than TLB."
config PERFMON
bool "Performance monitor support"
help
Selects whether support for the IA-64 performance monitor hardware
is included in the kernel. This makes some kernel data-structures a
little bigger and slows down execution a bit, but it is generally
a good idea to turn this on. If you're unsure, say Y.
config IA64_PALINFO
tristate "/proc/pal support"
help
If you say Y here, you are able to get PAL (Processor Abstraction
Layer) information in /proc/pal. This contains useful information
about the processors in your systems, such as cache and TLB sizes
and the PAL firmware version in use.
To use this option, you have to ensure that the "/proc file system
support" (CONFIG_PROC_FS) is enabled, too.
config IA64_MC_ERR_INJECT
tristate "MC error injection support"
help
Adds support for MC error injection. If enabled, the kernel
will provide a sysfs interface for user applications to
call MC error injection PAL procedures to inject various errors.
This is a useful tool for MCA testing.
If you're unsure, do not select this option.
config SGI_SN
def_bool y if (IA64_SGI_SN2 || IA64_GENERIC)
config IA64_ESI
bool "ESI (Extensible SAL Interface) support"
help
If you say Y here, support is built into the kernel to
make ESI calls. ESI calls are used to support vendor-specific
firmware extensions, such as the ability to inject memory-errors
for test-purposes. If you're unsure, say N.
config IA64_HP_AML_NFW
bool "Support ACPI AML calls to native firmware"
help
This driver installs a global ACPI Operation Region handler for
region 0xA1. AML methods can use this OpRegion to call arbitrary
native firmware functions. The driver installs the OpRegion
handler if there is an HPQ5001 device or if the user supplies
the "force" module parameter, e.g., with the "aml_nfw.force"
kernel command line option.
source "drivers/sn/Kconfig"
config KEXEC
bool "kexec system call (EXPERIMENTAL)"
depends on EXPERIMENTAL && !IA64_HP_SIM && (!SMP || HOTPLUG_CPU)
help
kexec is a system call that implements the ability to shutdown your
current kernel, and to start another kernel. It is like a reboot
but it is independent of the system firmware. And like a reboot
you can start any kernel with it, not just Linux.
The name comes from the similarity to the exec system call.
It is an ongoing process to be certain the hardware in a machine
is properly shutdown, so do not be surprised if this code does not
initially work for you. It may help to enable device hotplugging
support. As of this writing the exact hardware interface is
strongly in flux, so no good recommendation can be made.
config CRASH_DUMP
bool "kernel crash dumps"
depends on IA64_MCA_RECOVERY && !IA64_HP_SIM && (!SMP || HOTPLUG_CPU)
help
Generate crash dump after being started by kexec.
source "drivers/firmware/Kconfig"
source "fs/Kconfig.binfmt"
endmenu
menu "Power management and ACPI"
source "kernel/power/Kconfig"
source "drivers/acpi/Kconfig"
if PM
source "arch/ia64/kernel/cpufreq/Kconfig"
endif
endmenu
if !IA64_HP_SIM
menu "Bus options (PCI, PCMCIA)"
config PCI
bool "PCI support"
help
Real IA-64 machines all have PCI/PCI-X/PCI Express busses. Say Y
here unless you are using a simulator without PCI support.
config PCI_DOMAINS
def_bool PCI
config PCI_SYSCALL
def_bool PCI
source "drivers/pci/pcie/Kconfig"
source "drivers/pci/Kconfig"
source "drivers/pci/hotplug/Kconfig"
source "drivers/pcmcia/Kconfig"
endmenu
endif
source "net/Kconfig"
source "drivers/Kconfig"
config MSPEC
tristate "Memory special operations driver"
depends on IA64
select IA64_UNCACHED_ALLOCATOR
help
If you have an ia64 and you want to enable memory special
operations support (formerly known as fetchop), say Y here,
otherwise say N.
source "fs/Kconfig"
source "arch/ia64/kvm/Kconfig"
source "lib/Kconfig"
#
# Use the generic interrupt handling code in kernel/irq/:
#
config GENERIC_HARDIRQS
bool
default y
config GENERIC_IRQ_PROBE
bool
default y
config GENERIC_PENDING_IRQ
bool
depends on GENERIC_HARDIRQS && SMP
default y
config IRQ_PER_CPU
bool
default y
config IOMMU_HELPER
def_bool (IA64_HP_ZX1 || IA64_HP_ZX1_SWIOTLB || IA64_GENERIC || SWIOTLB)
source "arch/ia64/hp/sim/Kconfig"
source "arch/ia64/Kconfig.debug"
source "security/Kconfig"
source "crypto/Kconfig"
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