![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>
436 lines
9.5 KiB
Text
436 lines
9.5 KiB
Text
#
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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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mainmenu "Linux/M32R Kernel Configuration"
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config M32R
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bool
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default y
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select HAVE_IDE
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select HAVE_OPROFILE
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config SBUS
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bool
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config GENERIC_ISA_DMA
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bool
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default y
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config ZONE_DMA
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bool
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default y
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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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config NO_IOPORT
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def_bool y
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config NO_DMA
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def_bool y
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config HZ
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int
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default 100
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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 "Platform Type"
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default PLAT_MAPPI
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config PLAT_MAPPI
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bool "Mappi-I"
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help
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The Mappi-I is an FPGA board for SOC (System-On-a-Chip) prototyping.
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You can operate a Linux system on this board by using an M32R
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softmacro core, which is a fully-synthesizable functional model
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described in Verilog-HDL.
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The Mappi-I board was the first platform, which had been used
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to port and develop a Linux system for the M32R processor.
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Currently, the Mappi-II, an heir to the Mappi-I, is available.
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config PLAT_USRV
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bool "uServer"
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select PLAT_HAS_INT1ICU
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config PLAT_M32700UT
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bool "M32700UT"
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select PLAT_HAS_INT0ICU
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select PLAT_HAS_INT1ICU
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select PLAT_HAS_INT2ICU
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help
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The M3T-M32700UT is an evaluation board based on uT-Engine
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specification. This board has an M32700 (Chaos) evaluation chip.
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You can say Y for SMP, because the M32700 is a single chip
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multiprocessor.
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config PLAT_OPSPUT
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bool "OPSPUT"
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select PLAT_HAS_INT0ICU
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select PLAT_HAS_INT1ICU
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select PLAT_HAS_INT2ICU
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help
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The OPSPUT is an evaluation board based on uT-Engine
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specification. This board has a OPSP-REP chip.
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config PLAT_OAKS32R
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bool "OAKS32R"
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help
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The OAKS32R is a tiny, inexpensive evaluation board.
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Please note that if you say Y here and choose chip "M32102",
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say N for MMU and select a no-MMU version kernel, otherwise
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a kernel with MMU support will not work, because the M32102
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is a microcontroller for embedded systems and it has no MMU.
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config PLAT_MAPPI2
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bool "Mappi-II(M3A-ZA36/M3A-ZA52)"
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config PLAT_MAPPI3
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bool "Mappi-III(M3A-2170)"
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config PLAT_M32104UT
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bool "M32104UT"
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select PLAT_HAS_INT1ICU
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help
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The M3T-M32104UT is an reference board based on uT-Engine
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specification. This board has a M32104 chip.
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endchoice
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choice
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prompt "Processor family"
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default CHIP_M32700
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config CHIP_M32700
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bool "M32700 (Chaos)"
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config CHIP_M32102
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bool "M32102"
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config CHIP_M32104
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bool "M32104"
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depends on PLAT_M32104UT
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config CHIP_VDEC2
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bool "VDEC2"
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config CHIP_OPSP
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bool "OPSP"
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endchoice
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config MMU
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bool "Support for memory management hardware"
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depends on CHIP_M32700 || CHIP_VDEC2 || CHIP_OPSP
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default y
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config TLB_ENTRIES
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int "TLB Entries"
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depends on CHIP_M32700 || CHIP_VDEC2 || CHIP_OPSP
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default 32 if CHIP_M32700 || CHIP_OPSP
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default 16 if CHIP_VDEC2
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config ISA_M32R
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bool
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depends on CHIP_M32102 || CHIP_M32104
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default y
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config ISA_M32R2
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bool
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depends on CHIP_M32700 || CHIP_VDEC2 || CHIP_OPSP
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default y
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config ISA_DSP_LEVEL2
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bool
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depends on CHIP_M32700 || CHIP_OPSP
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default y
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config ISA_DUAL_ISSUE
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bool
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depends on CHIP_M32700 || CHIP_OPSP
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default y
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config PLAT_HAS_INT0ICU
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bool
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default n
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config PLAT_HAS_INT1ICU
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bool
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default n
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config PLAT_HAS_INT2ICU
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bool
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default n
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config BUS_CLOCK
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int "Bus Clock [Hz] (integer)"
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default "70000000" if PLAT_MAPPI
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default "25000000" if PLAT_USRV
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default "50000000" if PLAT_MAPPI3
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default "50000000" if PLAT_M32700UT
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default "50000000" if PLAT_OPSPUT
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default "54000000" if PLAT_M32104UT
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default "33333333" if PLAT_OAKS32R
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default "20000000" if PLAT_MAPPI2
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config TIMER_DIVIDE
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int "Timer divider (integer)"
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default "128"
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config CPU_LITTLE_ENDIAN
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bool "Generate little endian code"
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default n
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config MEMORY_START
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hex "Physical memory start address (hex)"
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default "08000000" if PLAT_MAPPI || PLAT_MAPPI2 || PLAT_MAPPI3
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default "08000000" if PLAT_USRV
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default "08000000" if PLAT_M32700UT
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default "08000000" if PLAT_OPSPUT
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default "04000000" if PLAT_M32104UT
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default "01000000" if PLAT_OAKS32R
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config MEMORY_SIZE
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hex "Physical memory size (hex)"
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default "08000000" if PLAT_MAPPI3
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default "04000000" if PLAT_MAPPI || PLAT_MAPPI2
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default "02000000" if PLAT_USRV
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default "01000000" if PLAT_M32700UT
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default "01000000" if PLAT_OPSPUT
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default "01000000" if PLAT_M32104UT
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default "00800000" if PLAT_OAKS32R
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config ARCH_DISCONTIGMEM_ENABLE
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bool "Internal RAM Support"
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depends on CHIP_M32700 || CHIP_M32102 || CHIP_VDEC2 || CHIP_OPSP || CHIP_M32104
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default y
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source "mm/Kconfig"
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config IRAM_START
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hex "Internal memory start address (hex)"
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default "00f00000" if !CHIP_M32104
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default "00700000" if CHIP_M32104
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depends on (CHIP_M32700 || CHIP_M32102 || CHIP_VDEC2 || CHIP_OPSP || CHIP_M32104) && DISCONTIGMEM
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config IRAM_SIZE
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hex "Internal memory size (hex)"
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depends on (CHIP_M32700 || CHIP_M32102 || CHIP_VDEC2 || CHIP_OPSP || CHIP_M32104) && DISCONTIGMEM
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default "00080000" if CHIP_M32700
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default "00010000" if CHIP_M32102 || CHIP_OPSP || CHIP_M32104
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default "00008000" if CHIP_VDEC2
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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 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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depends on M32R
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default y
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config RWSEM_XCHGADD_ALGORITHM
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bool
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default n
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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 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
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config GENERIC_CALIBRATE_DELAY
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bool
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default y
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config SCHED_NO_NO_OMIT_FRAME_POINTER
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bool
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default y
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config PREEMPT
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bool "Preemptible Kernel"
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help
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This option reduces the latency of the kernel when reacting to
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real-time or interactive events by allowing a low priority process to
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be preempted even if it is in kernel mode executing a system call.
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This allows applications to run more reliably even when the system is
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under load.
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Say Y here if you are building a kernel for a desktop, embedded
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or real-time system. Say N if you are unsure.
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config SMP
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bool "Symmetric multi-processing support"
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select USE_GENERIC_SMP_HELPERS
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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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People using multiprocessor machines who say Y here should also say
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Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
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Management" code will be disabled if you say Y here.
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See also the SMP-HOWTO available at
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<http://www.linuxdoc.org/docs.html#howto>.
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If you don't know what to do here, say N.
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config CHIP_M32700_TS1
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bool "Workaround code for the M32700 TS1 chip's bug"
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depends on (CHIP_M32700 && SMP)
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default n
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config NR_CPUS
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int "Maximum number of CPUs (2-32)"
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range 2 32
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depends on SMP
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default "2"
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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. The maximum supported value is 32 and the
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minimum value which makes sense is 2.
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This is purely to save memory - each supported CPU adds
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approximately eight kilobytes to the kernel image.
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# Common NUMA Features
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config NUMA
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bool "Numa Memory Allocation Support"
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depends on SMP && BROKEN
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default n
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config NODES_SHIFT
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int
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default "1"
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depends on NEED_MULTIPLE_NODES
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# turning this on wastes a bunch of space.
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# Summit needs it only when NUMA is on
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config BOOT_IOREMAP
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bool
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depends on NUMA
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default n
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endmenu
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menu "Bus options (PCI, PCMCIA, EISA, MCA, ISA)"
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config PCI
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bool "PCI support"
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depends on BROKEN
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default n
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help
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Find out whether you have a PCI motherboard. PCI is the name of a
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bus system, i.e. the way the CPU talks to the other stuff inside
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your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
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VESA. If you have PCI, say Y, otherwise N.
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choice
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prompt "PCI access mode"
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depends on PCI
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default PCI_GOANY
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config PCI_GOBIOS
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bool "BIOS"
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---help---
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On PCI systems, the BIOS can be used to detect the PCI devices and
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determine their configuration. However, some old PCI motherboards
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have BIOS bugs and may crash if this is done. Also, some embedded
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PCI-based systems don't have any BIOS at all. Linux can also try to
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detect the PCI hardware directly without using the BIOS.
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With this option, you can specify how Linux should detect the PCI
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devices. If you choose "BIOS", the BIOS will be used, if you choose
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"Direct", the BIOS won't be used, and if you choose "Any", the
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kernel will try the direct access method and falls back to the BIOS
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if that doesn't work. If unsure, go with the default, which is
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"Any".
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config PCI_GODIRECT
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bool "Direct"
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config PCI_GOANY
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bool "Any"
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endchoice
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config PCI_BIOS
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bool
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depends on PCI && (PCI_GOBIOS || PCI_GOANY)
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default y
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config PCI_DIRECT
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bool
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depends on PCI && (PCI_GODIRECT || PCI_GOANY)
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default y
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source "drivers/pci/Kconfig"
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config ISA
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bool
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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"
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source "fs/Kconfig.binfmt"
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endmenu
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source "net/Kconfig"
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source "drivers/Kconfig"
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source "fs/Kconfig"
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source "arch/m32r/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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