Paul Menage 999cd8a450 cgroups: add a per-subsystem hierarchy_mutex ... These patches introduce new locking/refcount support for cgroups to reduce the need for subsystems to call cgroup_lock(). This will ultimately allow the atomicity of cgroup_rmdir() (which was removed recently) to be restored. These three patches give: 1/3 - introduce a per-subsystem hierarchy_mutex which a subsystem can use to prevent changes to its own cgroup tree 2/3 - use hierarchy_mutex in place of calling cgroup_lock() in the memory controller 3/3 - introduce a css_tryget() function similar to the one recently proposed by Kamezawa, but avoiding spurious refcount failures in the event of a race between a css_tryget() and an unsuccessful cgroup_rmdir() Future patches will likely involve: - using hierarchy mutex in place of cgroup_lock() in more subsystems where appropriate - restoring the atomicity of cgroup_rmdir() with respect to cgroup_create() This patch: Add a hierarchy_mutex to the cgroup_subsys object that protects changes to the hierarchy observed by that subsystem. It is taken by the cgroup subsystem (in addition to cgroup_mutex) for the following operations: - linking a cgroup into that subsystem's cgroup tree - unlinking a cgroup from that subsystem's cgroup tree - moving the subsystem to/from a hierarchy (including across the bind() callback) Thus if the subsystem holds its own hierarchy_mutex, it can safely traverse its own hierarchy. Signed-off-by: Paul Menage <menage@google.com> Tested-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Li Zefan <lizf@cn.fujitsu.com> Cc: Balbir Singh <balbir@in.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2009-01-08 08:31:10 -08:00
..
ABI	mm: show node to memory section relationship with symlinks in sysfs	2009-01-06 15:59:00 -08:00
accounting
acpi
aoe
arm	Merge branch 'for-rmk' of git://git.kernel.org/pub/scm/linux/kernel/git/ycmiao/pxa-linux-2.6 into devel	2008-12-29 18:08:11 +00:00
auxdisplay
blackfin	Blackfin arch: Add document about bfin-gpio	2009-01-07 23:14:38 +08:00
block	Documentation: remove reference to ll_rw_blk.c and moved drivers/block/elevator.c	2008-12-29 08:28:43 +01:00
blockdev
cdrom
cgroups	cgroups: add a per-subsystem hierarchy_mutex	2009-01-08 08:31:10 -08:00
connector
console
controllers	memcg: fix swap accounting leak	2009-01-08 08:31:10 -08:00
cpu-freq	doc: Update sh cpufreq documentation.	2008-12-22 18:44:47 +09:00
cpuidle
cris
crypto
development-process
device-mapper
DocBook	wimax: Makefile, Kconfig and docbook linkage for the stack	2009-01-07 10:00:17 -08:00
driver-model
dvb	V4L/DVB (9812): [PATCH] short help for Technisat cards to select the right configuration	2008-12-30 09:38:35 -02:00
early-userspace
fault-injection
fb	[ARM] pxafb: add support for overlay1 and overlay2 as framebuffer devices	2008-12-29 18:00:04 +08:00
filesystems	Merge branch 'proc-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/adobriyan/proc	2009-01-07 12:01:06 -08:00
firmware_class
frv
hwmon	Merge branch 'hwmon-for-linus' of git://jdelvare.pck.nerim.net/jdelvare-2.6	2009-01-07 11:59:51 -08:00
i2c
i2o
ia64
ide	ide: update warm-plug HOWTO	2009-01-06 17:21:00 +01:00
infiniband
input	Merge commit 'v2.6.28-rc9' into next	2008-12-20 04:54:54 -05:00
ioctl	documentation: update header file paths	2009-01-06 15:59:28 -08:00
isdn
ja_JP
kbuild	kbuild: fix typos (s/bin_shipped/bin.o_shipped/) in Documentation	2009-01-07 21:44:23 +01:00
kdump
ko_KR
laptops	trivial: fix an -> a typos in documentation and comments	2009-01-06 11:28:07 +01:00
lguest	lguest: move the initial guest page table creation code to the host	2008-12-30 09:26:11 +10:30
m68k
make
mips	documentation: update header file paths	2009-01-06 15:59:28 -08:00
mn10300
mtd
namespaces
netlabel
networking	trivial: fix an -> a typos in documentation and comments	2009-01-06 11:28:07 +01:00
parisc
PCI	PCI: Add pci_clear_master() as opposite of pci_set_master()	2009-01-07 11:13:23 -08:00
pcmcia
power
powerpc	documentation: update header file paths	2009-01-06 15:59:28 -08:00
prctl
RCU	Merge branch 'core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2008-12-30 16:10:19 -08:00
s390	documentation: update s390 header file paths	2009-01-06 15:59:28 -08:00
scheduler	Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2008-12-28 12:27:58 -08:00
scsi	trivial: Fix misspelling of "firmware" in docs for ncr53c8xx/sym53c8xx	2009-01-06 11:28:09 +01:00
serial
sh	sh: Kill off remaining CONFIG_SH_KGDB bits.	2008-12-22 18:44:05 +09:00
sound	Merge branch 'topic/oxygen' into to-push	2008-12-25 11:40:30 +01:00
sparc
spi	hwmon: (lm70) Code streamlining and cleanup	2009-01-07 16:37:34 +01:00
sysctl	mm: add dirty_background_bytes and dirty_bytes sysctls	2009-01-06 15:59:03 -08:00
telephony
thermal
timers
tracers	tracing, doc: update mmiotrace documentation	2008-11-23 20:33:24 +01:00
uml
usb	USB: add asynchronous autosuspend/autoresume support	2009-01-07 09:59:53 -08:00
video4linux	V4L/DVB (10157): Add USB ID for the Sil4701 radio from DealExtreme	2009-01-02 17:13:56 -02:00
vm	mm: remove try_to_munlock from vmscan	2009-01-06 15:59:03 -08:00
w1
watchdog
wimax	i2400m: documentation and instructions for usage	2009-01-07 10:00:18 -08:00
x86	documentation: update header file paths	2009-01-06 15:59:28 -08:00
zh_CN
00-INDEX
applying-patches.txt
atomic_ops.txt
basic_profiling.txt
binfmt_misc.txt
braille-console.txt
bt8xxgpio.txt
BUG-HUNTING
c2port.txt
cachetlb.txt
Changes
CodingStyle
cpu-hotplug.txt	x86: use possible_cpus=NUM to extend the possible cpus allowed	2008-12-18 12:08:05 +01:00
cpu-load.txt
cpusets.txt
cputopology.txt	sysfs: add documentation to cputopology.txt for system cpumasks	2008-12-19 17:47:12 +10:30
credentials.txt
dcdbas.txt
debugging-modules.txt
debugging-via-ohci1394.txt
dell_rbu.txt	trivial: fix an -> a typos in documentation and comments	2009-01-06 11:28:07 +01:00
devices.txt
DMA-API.txt	DMA-API.txt: fix description of pci_map_sg/dma_map_sg scatterlists handling	2008-12-01 19:55:24 -08:00
DMA-attributes.txt
DMA-ISA-LPC.txt
DMA-mapping.txt	documentation: update header file paths	2009-01-06 15:59:28 -08:00
dontdiff
edac.txt
eisa.txt
email-clients.txt
exception.txt
feature-removal-schedule.txt	hwmon: Deprecate the fscher and fscpos drivers	2009-01-07 16:37:33 +01:00
ftrace.txt	ftrace: improve documentation	2008-11-28 13:15:14 +01:00
gpio.txt
highuid.txt
HOWTO
hw_random.txt
ics932s401
initrd.txt
Intel-IOMMU.txt
io_ordering.txt
io-mapping.txt
IO-mapping.txt
iostats.txt
IPMI.txt
IRQ-affinity.txt
IRQ.txt
irqflags-tracing.txt
isapnp.txt
java.txt
kernel-doc-nano-HOWTO.txt	documentation: how to use DOC: section blocks	2009-01-06 15:59:28 -08:00
kernel-docs.txt
kernel-parameters.txt	memcg: mem+swap controller Kconfig	2009-01-08 08:31:05 -08:00
keys-request-key.txt
keys.txt
kobject.txt	kobject: Make Documentation/kobject.txt a little more coherent.	2009-01-06 10:44:32 -08:00
kprobes.txt	kprobes: support probing module __exit function	2009-01-06 15:59:21 -08:00
kref.txt
ldm.txt
leds-class.txt
local_ops.txt	documentation: local_ops fix on_each_cpu	2008-12-01 13:51:26 +01:00
lockdep-design.txt
lockstat.txt
logo.gif
logo.txt
magic-number.txt	documentation: update header file paths	2009-01-06 15:59:28 -08:00
Makefile
ManagementStyle
markers.txt	markers: comment marker_synchronize_unregister() on data dependency	2008-11-28 16:47:41 +01:00
mca.txt
md.txt
memory-barriers.txt
memory-hotplug.txt	mm: show node to memory section relationship with symlinks in sysfs	2009-01-06 15:59:00 -08:00
memory.txt
mono.txt
mutex-design.txt
nmi_watchdog.txt
nommu-mmap.txt
numastat.txt
oops-tracing.txt
parport-lowlevel.txt
parport.txt
pi-futex.txt
pnp.txt
preempt-locking.txt
printk-formats.txt
prio_tree.txt
rbtree.txt
rfkill.txt
robust-futex-ABI.txt
robust-futexes.txt
rt-mutex-design.txt
rt-mutex.txt
rtc.txt
SAK.txt
SecurityBugs
SELinux.txt
serial-console.txt
sgi-ioc4.txt
sgi-visws.txt
SM501.txt
Smack.txt
sparse.txt
spinlocks.txt
stable_api_nonsense.txt
stable_kernel_rules.txt
SubmitChecklist
SubmittingDrivers
SubmittingPatches
svga.txt
sysfs-rules.txt
sysrq.txt
tracepoints.txt	tracepoints: Documentation TPPROTO misspelt in Documentation/tracepoints.txt	2008-11-29 15:13:42 +01:00
unaligned-memory-access.txt
unicode.txt
unshare.txt
VGA-softcursor.txt
video-output.txt
volatile-considered-harmful.txt
voyager.txt
zorro.txt