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authorMatt Helsley <matthltc@us.ibm.com>2008-10-18 20:27:21 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-10-20 08:52:34 -0700
commitdc52ddc0e6f45b04780b26fc0813509f8e798c42 (patch)
tree384826e9fab4e434bc5c85ce744470ae472e52c3 /arch
parent8174f1503f4bf7e9a14b3fbbfdb30c6be6e29f77 (diff)
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>
Diffstat (limited to 'arch')
-rw-r--r--arch/alpha/Kconfig1
-rw-r--r--arch/arm/Kconfig2
-rw-r--r--arch/avr32/Kconfig2
-rw-r--r--arch/blackfin/Kconfig3
-rw-r--r--arch/cris/Kconfig2
-rw-r--r--arch/frv/Kconfig2
-rw-r--r--arch/h8300/Kconfig2
-rw-r--r--arch/ia64/Kconfig2
-rw-r--r--arch/m32r/Kconfig2
-rw-r--r--arch/m68k/Kconfig2
-rw-r--r--arch/m68knommu/Kconfig2
-rw-r--r--arch/mips/Kconfig2
-rw-r--r--arch/mn10300/Kconfig2
-rw-r--r--arch/parisc/Kconfig2
-rw-r--r--arch/powerpc/Kconfig2
-rw-r--r--arch/s390/Kconfig2
-rw-r--r--arch/sh/Kconfig2
-rw-r--r--arch/sparc/Kconfig2
-rw-r--r--arch/sparc64/Kconfig1
-rw-r--r--arch/um/Kconfig2
-rw-r--r--arch/x86/Kconfig1
-rw-r--r--arch/xtensa/Kconfig1
22 files changed, 41 insertions, 0 deletions
diff --git a/arch/alpha/Kconfig b/arch/alpha/Kconfig
index a0f642b6a4b..6110197757a 100644
--- a/arch/alpha/Kconfig
+++ b/arch/alpha/Kconfig
@@ -70,6 +70,7 @@ config AUTO_IRQ_AFFINITY
default y
source "init/Kconfig"
+source "kernel/Kconfig.freezer"
menu "System setup"
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 4853f9df37b..df39d20f742 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -192,6 +192,8 @@ config VECTORS_BASE
source "init/Kconfig"
+source "kernel/Kconfig.freezer"
+
menu "System Type"
choice
diff --git a/arch/avr32/Kconfig b/arch/avr32/Kconfig
index 7c239a91627..33a5b2969eb 100644
--- a/arch/avr32/Kconfig
+++ b/arch/avr32/Kconfig
@@ -72,6 +72,8 @@ config GENERIC_BUG
source "init/Kconfig"
+source "kernel/Kconfig.freezer"
+
menu "System Type and features"
source "kernel/time/Kconfig"
diff --git a/arch/blackfin/Kconfig b/arch/blackfin/Kconfig
index 8102c79aaa9..29e71ed6b8a 100644
--- a/arch/blackfin/Kconfig
+++ b/arch/blackfin/Kconfig
@@ -64,8 +64,11 @@ config HARDWARE_PM
depends on OPROFILE
source "init/Kconfig"
+
source "kernel/Kconfig.preempt"
+source "kernel/Kconfig.freezer"
+
menu "Blackfin Processor Options"
comment "Processor and Board Settings"
diff --git a/arch/cris/Kconfig b/arch/cris/Kconfig
index 9389d38f222..07335e719bf 100644
--- a/arch/cris/Kconfig
+++ b/arch/cris/Kconfig
@@ -62,6 +62,8 @@ config HZ
source "init/Kconfig"
+source "kernel/Kconfig.freezer"
+
menu "General setup"
source "fs/Kconfig.binfmt"
diff --git a/arch/frv/Kconfig b/arch/frv/Kconfig
index a5aac1b0756..9d1552a9ee2 100644
--- a/arch/frv/Kconfig
+++ b/arch/frv/Kconfig
@@ -66,6 +66,8 @@ mainmenu "Fujitsu FR-V Kernel Configuration"
source "init/Kconfig"
+source "kernel/Kconfig.freezer"
+
menu "Fujitsu FR-V system setup"
diff --git a/arch/h8300/Kconfig b/arch/h8300/Kconfig
index c7966746fbf..bd1995403c6 100644
--- a/arch/h8300/Kconfig
+++ b/arch/h8300/Kconfig
@@ -90,6 +90,8 @@ config HZ
source "init/Kconfig"
+source "kernel/Kconfig.freezer"
+
source "arch/h8300/Kconfig.cpu"
menu "Executable file formats"
diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index 3b7aa38254a..912c57db2d2 100644
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig
@@ -7,6 +7,8 @@ mainmenu "IA-64 Linux Kernel Configuration"
source "init/Kconfig"
+source "kernel/Kconfig.freezer"
+
menu "Processor type and features"
config IA64
diff --git a/arch/m32r/Kconfig b/arch/m32r/Kconfig
index 00289c178f8..dbaed4a6381 100644
--- a/arch/m32r/Kconfig
+++ b/arch/m32r/Kconfig
@@ -42,6 +42,8 @@ config HZ
source "init/Kconfig"
+source "kernel/Kconfig.freezer"
+
menu "Processor type and features"
diff --git a/arch/m68k/Kconfig b/arch/m68k/Kconfig
index 677c93a490f..836fb66f080 100644
--- a/arch/m68k/Kconfig
+++ b/arch/m68k/Kconfig
@@ -62,6 +62,8 @@ mainmenu "Linux/68k Kernel Configuration"
source "init/Kconfig"
+source "kernel/Kconfig.freezer"
+
menu "Platform dependent setup"
config EISA
diff --git a/arch/m68knommu/Kconfig b/arch/m68knommu/Kconfig
index 0a8998315e5..76b66feb74d 100644
--- a/arch/m68knommu/Kconfig
+++ b/arch/m68knommu/Kconfig
@@ -75,6 +75,8 @@ config NO_IOPORT
source "init/Kconfig"
+source "kernel/Kconfig.freezer"
+
menu "Processor type and features"
choice
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index b905744d791..5f149b030c0 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -1885,6 +1885,8 @@ config PROBE_INITRD_HEADER
add initrd or initramfs image to the kernel image.
Otherwise, say N.
+source "kernel/Kconfig.freezer"
+
menu "Bus options (PCI, PCMCIA, EISA, ISA, TC)"
config HW_HAS_EISA
diff --git a/arch/mn10300/Kconfig b/arch/mn10300/Kconfig
index dd557c9cf00..9a9f4335887 100644
--- a/arch/mn10300/Kconfig
+++ b/arch/mn10300/Kconfig
@@ -68,6 +68,8 @@ mainmenu "Matsushita MN10300/AM33 Kernel Configuration"
source "init/Kconfig"
+source "kernel/Kconfig.freezer"
+
menu "Matsushita MN10300 system setup"
diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig
index 8313fccced5..2bd1f6ef5db 100644
--- a/arch/parisc/Kconfig
+++ b/arch/parisc/Kconfig
@@ -90,6 +90,8 @@ config ARCH_MAY_HAVE_PC_FDC
source "init/Kconfig"
+source "kernel/Kconfig.freezer"
+
menu "Processor type and features"
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 380baa1780e..9391199d9e7 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -230,6 +230,8 @@ config PPC_OF_PLATFORM_PCI
source "init/Kconfig"
+source "kernel/Kconfig.freezer"
+
source "arch/powerpc/sysdev/Kconfig"
source "arch/powerpc/platforms/Kconfig"
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index bc581d8a7cd..70b7645ce74 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -78,6 +78,8 @@ config S390
source "init/Kconfig"
+source "kernel/Kconfig.freezer"
+
menu "Base setup"
comment "Processor type and features"
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index 5131d50f851..2ed5713b754 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -106,6 +106,8 @@ config IO_TRAPPED
source "init/Kconfig"
+source "kernel/Kconfig.freezer"
+
menu "System type"
#
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index 97671dac12a..e594559c8db 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -37,6 +37,8 @@ config HZ
source "init/Kconfig"
+source "kernel/Kconfig.freezer"
+
menu "General machine setup"
config SMP
diff --git a/arch/sparc64/Kconfig b/arch/sparc64/Kconfig
index 5446e2a499b..035b15af90d 100644
--- a/arch/sparc64/Kconfig
+++ b/arch/sparc64/Kconfig
@@ -96,6 +96,7 @@ config GENERIC_HARDIRQS_NO__DO_IRQ
def_bool y
source "init/Kconfig"
+source "kernel/Kconfig.freezer"
menu "Processor type and features"
diff --git a/arch/um/Kconfig b/arch/um/Kconfig
index 6976812cfb1..393bccfe178 100644
--- a/arch/um/Kconfig
+++ b/arch/um/Kconfig
@@ -229,6 +229,8 @@ endmenu
source "init/Kconfig"
+source "kernel/Kconfig.freezer"
+
source "drivers/block/Kconfig"
source "arch/um/Kconfig.char"
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index bd3c2c53873..49349ba77d8 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -193,6 +193,7 @@ config X86_TRAMPOLINE
config KTIME_SCALAR
def_bool X86_32
source "init/Kconfig"
+source "kernel/Kconfig.freezer"
menu "Processor type and features"
diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig
index 02e417d3d8e..a213260b51e 100644
--- a/arch/xtensa/Kconfig
+++ b/arch/xtensa/Kconfig
@@ -55,6 +55,7 @@ config HZ
default 100
source "init/Kconfig"
+source "kernel/Kconfig.freezer"
menu "Processor type and features"