![Matt Helsley](/assets/img/avatar_default.png)
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>
435 lines
9 KiB
Text
435 lines
9 KiB
Text
# sparc64 configuration
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mainmenu "Linux Kernel Configuration for 64-bit SPARC"
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config SPARC
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bool
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default y
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select HAVE_OPROFILE
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select HAVE_KPROBES
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select HAVE_KRETPROBES
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config SPARC64
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bool
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default y
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select HAVE_DYNAMIC_FTRACE
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select HAVE_FTRACE
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select HAVE_IDE
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select HAVE_LMB
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select HAVE_ARCH_KGDB
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select USE_GENERIC_SMP_HELPERS if SMP
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select HAVE_ARCH_TRACEHOOK
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select ARCH_WANT_OPTIONAL_GPIOLIB
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select RTC_CLASS
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select RTC_DRV_M48T59
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select RTC_DRV_CMOS
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select RTC_DRV_BQ4802
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select RTC_DRV_SUN4V
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select RTC_DRV_STARFIRE
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config GENERIC_TIME
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bool
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default y
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config GENERIC_CMOS_UPDATE
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bool
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default y
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config GENERIC_CLOCKEVENTS
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bool
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default y
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config GENERIC_GPIO
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bool
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help
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Generic GPIO API support
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config 64BIT
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def_bool y
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config MMU
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bool
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default y
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config IOMMU_HELPER
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bool
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default y
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config QUICKLIST
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bool
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default y
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config STACKTRACE_SUPPORT
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bool
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default y
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config LOCKDEP_SUPPORT
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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 ARCH_HAS_ILOG2_U32
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bool
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default n
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config ARCH_HAS_ILOG2_U64
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bool
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default n
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config AUDIT_ARCH
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bool
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default y
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config HAVE_SETUP_PER_CPU_AREA
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def_bool y
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config ARCH_NO_VIRT_TO_BUS
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def_bool y
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config OF
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def_bool y
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config GENERIC_HARDIRQS_NO__DO_IRQ
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bool
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def_bool y
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source "init/Kconfig"
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source "kernel/Kconfig.freezer"
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menu "Processor type and features"
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choice
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prompt "Kernel page size"
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default SPARC64_PAGE_SIZE_8KB
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config SPARC64_PAGE_SIZE_8KB
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bool "8KB"
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help
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This lets you select the page size of the kernel.
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8KB and 64KB work quite well, since SPARC ELF sections
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provide for up to 64KB alignment.
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If you don't know what to do, choose 8KB.
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config SPARC64_PAGE_SIZE_64KB
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bool "64KB"
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endchoice
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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 HOTPLUG_CPU
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bool "Support for hot-pluggable CPUs"
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depends on SMP
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select HOTPLUG
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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 GENERIC_HARDIRQS
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bool
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default y
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source "kernel/time/Kconfig"
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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, say N. If you have a system with more than
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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 single-processor machines.
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On a single-processor machine, the kernel will run faster if you say
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N here.
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If you don't know what to do here, say N.
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config NR_CPUS
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int "Maximum number of CPUs (2-1024)"
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range 2 1024
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depends on SMP
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default "64"
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source "drivers/cpufreq/Kconfig"
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config US3_FREQ
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tristate "UltraSPARC-III CPU Frequency driver"
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depends on CPU_FREQ
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select CPU_FREQ_TABLE
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help
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This adds the CPUFreq driver for UltraSPARC-III processors.
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For details, take a look at <file:Documentation/cpu-freq>.
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If in doubt, say N.
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config US2E_FREQ
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tristate "UltraSPARC-IIe CPU Frequency driver"
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depends on CPU_FREQ
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select CPU_FREQ_TABLE
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help
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This adds the CPUFreq driver for UltraSPARC-IIe processors.
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For details, take a look at <file:Documentation/cpu-freq>.
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If in doubt, say N.
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config US3_MC
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tristate "UltraSPARC-III Memory Controller driver"
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default y
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help
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This adds a driver for the UltraSPARC-III memory controller.
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Loading this driver allows exact mnemonic strings to be
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printed in the event of a memory error, so that the faulty DIMM
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on the motherboard can be matched to the error.
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If in doubt, say Y, as this information can be very useful.
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# Global things across all Sun machines.
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config GENERIC_LOCKBREAK
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bool
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default y
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depends on SMP && PREEMPT
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config RWSEM_GENERIC_SPINLOCK
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bool
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config RWSEM_XCHGADD_ALGORITHM
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bool
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default y
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config GENERIC_FIND_NEXT_BIT
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bool
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default y
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config GENERIC_HWEIGHT
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bool
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default y if !ULTRA_HAS_POPULATION_COUNT
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config GENERIC_CALIBRATE_DELAY
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bool
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default y
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choice
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prompt "SPARC64 Huge TLB Page Size"
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depends on HUGETLB_PAGE
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default HUGETLB_PAGE_SIZE_4MB
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config HUGETLB_PAGE_SIZE_4MB
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bool "4MB"
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config HUGETLB_PAGE_SIZE_512K
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bool "512K"
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config HUGETLB_PAGE_SIZE_64K
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depends on !SPARC64_PAGE_SIZE_64KB
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bool "64K"
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endchoice
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endmenu
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config NUMA
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bool "NUMA support"
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depends on SMP
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config NODES_SHIFT
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int
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default "4"
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depends on NEED_MULTIPLE_NODES
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# Some NUMA nodes have memory ranges that span
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# other nodes. Even though a pfn is valid and
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# between a node's start and end pfns, it may not
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# reside on that node. See memmap_init_zone()
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# for details.
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config NODES_SPAN_OTHER_NODES
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def_bool y
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depends on NEED_MULTIPLE_NODES
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config ARCH_POPULATES_NODE_MAP
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def_bool y
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config ARCH_SELECT_MEMORY_MODEL
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def_bool y
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config ARCH_SPARSEMEM_ENABLE
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def_bool y
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select SPARSEMEM_VMEMMAP_ENABLE
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config ARCH_SPARSEMEM_DEFAULT
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def_bool y
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source "mm/Kconfig"
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config ISA
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bool
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config ISAPNP
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bool
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config EISA
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bool
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config MCA
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bool
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config PCMCIA
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tristate
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help
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Say Y here if you want to attach PCMCIA- or PC-cards to your Linux
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computer. These are credit-card size devices such as network cards,
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modems or hard drives often used with laptops computers. There are
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actually two varieties of these cards: the older 16 bit PCMCIA cards
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and the newer 32 bit CardBus cards. If you want to use CardBus
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cards, you need to say Y here and also to "CardBus support" below.
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To use your PC-cards, you will need supporting software from David
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Hinds' pcmcia-cs package (see the file <file:Documentation/Changes>
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for location). Please also read the PCMCIA-HOWTO, available from
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<http://www.tldp.org/docs.html#howto>.
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To compile this driver as modules, choose M here: the
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modules will be called pcmcia_core and ds.
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config SBUS
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bool
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default y
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config SBUSCHAR
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bool
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default y
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config SUN_AUXIO
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bool
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default y
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config SUN_IO
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bool
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default y
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config SUN_LDOMS
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bool "Sun Logical Domains support"
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help
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Say Y here is you want to support virtual devices via
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Logical Domains.
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config PCI
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bool "PCI support"
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select ARCH_SUPPORTS_MSI
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help
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Find out whether your system includes a PCI bus. PCI is the name of
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a bus system, i.e. the way the CPU talks to the other stuff inside
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your box. If you say Y here, the kernel will include drivers and
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infrastructure code to support PCI bus devices.
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config PCI_DOMAINS
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def_bool PCI
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config PCI_SYSCALL
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def_bool PCI
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source "drivers/pci/Kconfig"
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config SUN_OPENPROMFS
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tristate "Openprom tree appears in /proc/openprom"
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help
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If you say Y, the OpenPROM device tree will be available as a
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virtual file system, which you can mount to /proc/openprom by "mount
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-t openpromfs none /proc/openprom".
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To compile the /proc/openprom support as a module, choose M here: the
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module will be called openpromfs. If unsure, choose M.
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menu "Executable file formats"
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source "fs/Kconfig.binfmt"
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config COMPAT
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bool
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default y
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select COMPAT_BINFMT_ELF
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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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config SCHED_SMT
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bool "SMT (Hyperthreading) scheduler support"
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depends on SMP
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default y
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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 SPARC cpus at a cost of slightly increased overhead
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in some places. If unsure say N here.
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config SCHED_MC
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bool "Multi-core scheduler support"
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depends on SMP
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default y
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help
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Multi-core scheduler support improves the CPU scheduler's decision
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making when dealing with multi-core CPU chips at a cost of slightly
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increased overhead in some places. If unsure say N here.
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source "kernel/Kconfig.preempt"
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config CMDLINE_BOOL
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bool "Default bootloader kernel arguments"
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config CMDLINE
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string "Initial kernel command string"
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depends on CMDLINE_BOOL
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default "console=ttyS0,9600 root=/dev/sda1"
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help
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Say Y here if you want to be able to pass default arguments to
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the kernel. This will be overridden by the bootloader, if you
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use one (such as SILO). This is most useful if you want to boot
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a kernel from TFTP, and want default options to be available
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with having them passed on the command line.
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NOTE: This option WILL override the PROM bootargs setting!
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source "net/Kconfig"
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source "drivers/Kconfig"
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source "drivers/sbus/char/Kconfig"
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source "fs/Kconfig"
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source "arch/sparc64/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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