Ben Blum
aae8aab403
cgroups: revamp subsys array ...
This patch series provides the ability for cgroup subsystems to be
compiled as modules both within and outside the kernel tree. This is
mainly useful for classifiers and subsystems that hook into components
that are already modules. cls_cgroup and blkio-cgroup serve as the
example use cases for this feature.
It provides an interface cgroup_load_subsys() and cgroup_unload_subsys()
which modular subsystems can use to register and depart during runtime.
The net_cls classifier subsystem serves as the example for a subsystem
which can be converted into a module using these changes.
Patch #1 sets up the subsys[] array so its contents can be dynamic as
modules appear and (eventually) disappear. Iterations over the array are
modified to handle when subsystems are absent, and the dynamic section of
the array is protected by cgroup_mutex.
Patch #2 implements an interface for modules to load subsystems, called
cgroup_load_subsys, similar to cgroup_init_subsys, and adds a module
pointer in struct cgroup_subsys.
Patch #3 adds a mechanism for unloading modular subsystems, which includes
a more advanced rework of the rudimentary reference counting introduced in
patch 2.
Patch #4 modifies the net_cls subsystem, which already had some module
declarations, to be configurable as a module, which also serves as a
simple proof-of-concept.
Part of implementing patches 2 and 4 involved updating css pointers in
each css_set when the module appears or leaves. In doing this, it was
discovered that css_sets always remain linked to the dummy cgroup,
regardless of whether or not any subsystems are actually bound to it
(i.e., not mounted on an actual hierarchy). The subsystem loading and
unloading code therefore should keep in mind the special cases where the
added subsystem is the only one in the dummy cgroup (and therefore all
css_sets need to be linked back into it) and where the removed subsys was
the only one in the dummy cgroup (and therefore all css_sets should be
unlinked from it) - however, as all css_sets always stay attached to the
dummy cgroup anyway, these cases are ignored. Any fix that addresses this
issue should also make sure these cases are addressed in the subsystem
loading and unloading code.
This patch:
Make subsys[] able to be dynamically populated to support modular
subsystems
This patch reworks the way the subsys[] array is used so that subsystems
can register themselves after boot time, and enables the internals of
cgroups to be able to handle when subsystems are not present or may
appear/disappear.
Signed-off-by: Ben Blum <bblum@andrew.cmu.edu>
Acked-by: Li Zefan <lizf@cn.fujitsu.com>
Cc: Paul Menage <menage@google.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-03-12 15:52:36 -08:00
ARM: 5951/1: ARM: fix documentation of the PrimeCell bus
2010-02-20 14:10:48 +00:00
can: ti hecc module : add platform specific initialization callback.
2010-02-26 05:22:03 -08:00
lib: add support for LZO-compressed kernels
2010-01-11 09:34:04 -08:00
mfd: Introduce remove_script function for twl4030
2010-03-07 22:17:32 +01:00
Input: sh_keysc - update the driver with mode 6
2010-02-10 23:04:18 -08:00
CAPI: Rework locking of controller data structures
2010-02-16 16:01:22 -08:00
mfd: Fix ucb1x00 build failure for collie_defconfig
2010-03-07 22:17:39 +01:00
sdio: put active devices into 1-bit mode during suspend
2010-03-06 11:26:37 -08:00
mtd: sh_flctl SHBUSSEL and SEL_16BIT support
2010-02-02 13:02:16 +09:00
netfilter: xtables: replace XT_MATCH_ITERATE macro
2010-02-24 18:34:48 +01:00
netfilter: xtables: replace XT_ENTRY_ITERATE macro
2010-02-24 18:32:59 +01:00
netfilter: xtables: add struct xt_mtdtor_param::net
2010-01-18 08:25:47 +01:00
netfilter: xtables: replace XT_MATCH_ITERATE macro
2010-02-24 18:34:48 +01:00
netfilter: xtables: replace XT_MATCH_ITERATE macro
2010-02-24 18:34:48 +01:00
regulator: enable max8649 regulator driver
2010-03-03 14:49:24 +00:00
gpio: add driver for MAX7300 I2C GPIO extender
2010-03-06 11:26:48 -08:00
nfs41 do not allocate unused back channel pages
2010-02-10 08:31:02 -05:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6
2010-03-08 07:34:26 -08:00
x86, ACPI: delete acpi_boot_table_init() return value
2010-01-06 16:18:15 -05:00
ata: Detect Delkin Devices compact flash
2010-03-01 15:11:32 -05:00
Lose the first argument of audit_inode_child()
2010-02-08 14:38:36 -05:00
coredump: pass mm->flags as a coredump parameter for consistency
2010-03-06 11:26:46 -08:00
bitops: rename for_each_bit() to for_each_set_bit()
2010-03-06 11:26:23 -08:00
block: Consolidate phys_segment and hw_segment limits
2010-02-26 13:58:08 +01:00
percpu: add __percpu sparse annotations to core kernel subsystems
2010-02-17 11:17:38 +09:00
x86: Make 64 bit use early_res instead of bootmem before slab
2010-02-12 09:41:59 -08:00
tg3: Push phylib definitions to phylib
2010-02-17 17:27:40 -08:00
cciss: Consolidate duplicate bits in cciss_cmd.h & cciss_ioctl.h
2010-02-22 13:44:45 +01:00
cciss: Consolidate duplicate bits in cciss_cmd.h & cciss_ioctl.h
2010-02-22 13:44:45 +01:00
cgroups: revamp subsys array
2010-03-12 15:52:36 -08:00
clocksource: add suspend callback
2010-02-05 14:54:10 +01:00
Add generic sys_old_select()
2010-03-12 15:52:32 -08:00
percpu: add __percpu for sparse
2010-02-05 07:35:05 -08:00
connector: Delete buggy notification code.
2010-02-02 15:58:48 -08:00
coredump: plug a memory leak situation on dump_seek()
2010-03-12 15:52:32 -08:00
cpumask: let num_*_cpus() function always return unsigned values
2010-03-06 11:26:29 -08:00
sched: Use lockdep-based checking on rcu_dereference()
2010-02-25 10:34:26 +01:00
TI Davinci EMAC : Abstract Buffer address translation logic.
2010-02-04 13:29:53 -08:00
dm table: remove unused dm_get_device range parameters
2010-03-06 02:32:27 +00:00
Driver core: create lock/unlock functions for struct device
2010-03-07 17:04:52 -08:00
dm: eliminate some holes data structures
2010-03-06 02:32:33 +00:00
dm ioctl: introduce flag indicating uevent was generated
2010-03-06 02:32:31 +00:00
Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx
2010-03-04 08:20:14 -08:00
drbd: The kernel code is now equivalent to out of tree release 8.3.7
2010-01-12 10:14:42 +01:00
drbd: Allow online resizing of DRBD devices while peer not reachable (needs to be explicitly forced)
2010-01-12 10:02:46 +01:00
early_res: Add free_early_partial()
2010-02-26 08:25:35 +01:00
elf coredump: add extended numbering support
2010-03-06 11:26:46 -08:00
elf coredump: add extended numbering support
2010-03-06 11:26:46 -08:00
Revert "ethtool: Add n-tuple string length to drvinfo and return it"
2010-02-26 05:12:02 -08:00
eventfd - allow atomic read and waitqueue remove
2010-01-25 12:26:38 -02:00
commit_metadata export operation replacing nfsd_sync_dir
2010-02-20 13:13:44 -08:00
Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs-2.6
2010-03-05 13:20:53 -08:00
ext3: Use bitops to read/modify EXT3_I(inode)->i_state
2010-03-05 00:20:20 +01:00
ext3: Replace lock/unlock_super() with an explicit lock for resizing
2009-12-23 13:44:12 +01:00
ext3: quota macros cleanup [V2]
2009-12-23 13:33:54 +01:00
failslab: add ability to filter slab caches
2010-02-26 19:19:39 +02:00
vga_switcheroo: initial implementation (v15)
2010-03-01 16:20:37 +10:00
vfs: Abstract rcu_dereference_check for files-fdtable use
2010-02-25 10:34:49 +01:00
fiemap: Add new extent flag FIEMAP_EXTENT_SHARED
2009-12-17 20:55:57 -08:00
firewire: cdev: increment ABI version number
2010-02-24 20:36:55 +01:00
firewire: qualify config ROM cache pointers as const pointers
2009-12-29 19:58:17 +01:00
memory-hotplug: create /sys/firmware/memmap entry for new memory
2010-03-06 11:26:25 -08:00
include/linux/fs.h: convert FMODE_* constants to hex
2010-03-06 11:26:25 -08:00
Lose the first argument of audit_inode_child()
2010-02-08 14:38:36 -05:00
Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2010-02-28 10:20:25 -08:00
Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2010-02-28 10:20:25 -08:00
Input: gameport - let device core tell us if device was registered
2010-01-06 00:23:51 -08:00
percpu: add __percpu sparse annotations to core kernel subsystems
2010-02-17 11:17:38 +09:00
mm: add comment about deprecation of __GFP_NOFAIL
2010-03-06 11:26:27 -08:00
GFS2: Remove old, unused linked list code from quota
2010-03-01 14:08:10 +00:00
Input: gpio-keys - add support for disabling gpios through sysfs
2010-02-04 00:50:44 -08:00
Merge branches 'upstream', 'raw_report_modifications' and 'apple_magic_mouse' into for-linus
2010-02-25 17:39:16 +01:00
Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/xfs-vipt
2010-02-26 17:05:10 -08:00
mfd: Add HTCPLD driver
2010-03-07 22:17:09 +01:00
perf: Make bp_len type to u64 generic across the arch
2010-02-04 01:07:12 +01:00
ARM: PNX4008: move i2c_adapter structure inside the drivers private data
2010-02-12 17:32:41 +00:00
i2c: Add SMBus alert support
2010-03-02 12:23:42 +01:00
i2c: Document the message size limit
2010-03-02 12:23:49 +01:00
block: Consolidate phys_segment and hw_segment limits
2010-02-26 13:58:08 +01:00
ipv6: drop unused "dev" arg of icmpv6_send()
2010-02-18 14:30:17 -08:00
ide: make ide_get_best_pio_mode() static
2010-01-19 01:52:36 -08:00
mac80211: Account HT Control field in Data frame hdrlen according to 802.11n-2009
2010-01-22 16:11:27 -05:00
if_link: Add SR-IOV configuration methods
2010-02-12 16:56:07 -08:00
net/macvtap: add vhost support
2010-02-18 14:08:38 -08:00
packet: Add GSO/csum offload support.
2010-02-04 20:24:10 -08:00
tun: socket filter support
2010-02-17 16:35:17 -08:00
igmp: fix ip_mc_sf_allow race [v5]
2010-02-02 07:32:29 -08:00
ima: rename ima_path_check to ima_file_check
2010-02-07 03:06:22 -05:00
tcp: Generalized TTL Security Mechanism
2010-01-11 16:28:01 -08:00
net ipv4: Decouple ipv4 interface parameters from binary sysctl numbers
2010-02-16 15:55:17 -08:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
2010-03-01 10:38:09 -08:00
block: remove padding from io_context on 64bit builds
2010-02-26 14:00:43 +01:00
resource: add release_child_resources
2010-02-22 16:17:00 -08:00
Merge branch 'x86-apic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2010-03-03 08:15:37 -08:00
jbd[2]: remove references to BUFFER_DEBUG
2010-03-05 00:20:20 +01:00
Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs-2.6
2010-03-05 13:20:53 -08:00
Input: Mac button emulation - implement as an input filter
2010-01-30 01:47:49 -08:00
Merge branch 'for-linus' of git://gitorious.org/linux-omap-dss2/linux
2010-03-02 10:41:26 -08:00
Merge branch 'x86-bootmem-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2010-03-03 08:15:05 -08:00
CAPI: Rework controller state notifier
2010-02-16 16:01:21 -08:00
percpu: add __percpu sparse annotations to core kernel subsystems
2010-02-17 11:17:38 +09:00
kfifo: Don't use integer as NULL pointer
2010-02-16 15:11:08 -08:00
kgdb: Fix kernel-doc format error in kgdb.h
2010-01-07 11:58:37 -06:00
kmemcheck: make bitfield annotations truly no-ops when disabled
2010-01-11 09:34:04 -08:00
kmsg_dump: Dump on crash_kexec as well
2009-12-31 19:45:04 +00:00
Driver core: Constify struct sysfs_ops in struct kobj_type
2010-03-07 17:04:49 -08:00
kprobes: Jump optimization sysctl interface
2010-02-25 17:49:25 +01:00
KVM: x86: Add KVM_CAP_X86_ROBUST_SINGLESTEP
2010-03-01 12:36:14 -03:00
KVM: Convert kvm->requests_lock to raw_spinlock_t
2010-03-01 12:36:13 -03:00
libata: Pass host flags into the pci helper
2010-03-01 14:58:46 -05:00
lib: fix first line of kernel-doc for a few functions
2010-03-06 11:26:35 -08:00
lib: Introduce generic list_sort function
2010-01-12 21:02:00 -08:00
llc: add support for LLC_OPT_PKTINFO
2009-12-26 20:40:34 -08:00
lmb: Add lmb_free()
2010-02-03 17:39:50 +11:00
rcu: Integrate rcu_dereference_check() message into lockdep
2010-02-25 09:41:01 +01:00
switch inotify_user to anon_inode
2010-02-19 03:35:12 -05:00
mm: Add notifier in pageblock isolation for balloon drivers
2009-12-18 14:53:36 +11:00
vhost_net: a kernel-level virtio server
2010-01-15 01:43:29 -08:00
mm: introduce dump_page() and print symbolic flag names
2010-03-12 15:52:28 -08:00
nommu: fix build breakage
2010-03-12 15:52:28 -08:00
mm: restore zone->all_unreclaimable to independence word
2010-03-06 11:26:25 -08:00
take check for new events in namespace (guts of mounts_poll()) to namespace.c
2010-03-03 14:07:59 -05:00
percpu: add __percpu sparse annotations to core kernel subsystems
2010-02-17 11:17:38 +09:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6
2010-03-04 08:15:33 -08:00
Fix f_flags/f_mode in case of lookup_instantiate_filp() from open(pathname, 3)
2009-12-22 12:27:34 -05:00
net: CONFIG_COMPAT redux
2010-02-03 20:32:28 -08:00
dev: support deferring device flag change notifications
2010-02-27 02:43:40 -08:00
netfilter: restore POST_ROUTING hook in NF_HOOK_COND
2010-02-19 08:03:28 +01:00
netpoll: allow execution of multiple rx_hooks per interface
2010-01-13 20:38:26 -08:00
NFS: Remove requirement for inode->i_mutex from nfs_invalidate_mapping
2010-03-05 15:44:56 -05:00
Merge branch 'writeback-for-2.6.34' into nfs-for-2.6.34
2010-03-05 15:46:18 -05:00
nilfs2: issue discard request after cleaning segments
2010-02-13 12:26:02 +09:00
nl80211: add power save commands
2010-02-19 15:52:40 -05:00
nodemask.h: remove macro any_online_node
2010-03-06 11:26:31 -08:00
of/sparc: Remove sparc-local declaration of allnodes and devtree_lock
2010-02-14 13:02:44 -07:00
of/flattree: Don't assume HAVE_LMB
2010-02-14 07:13:47 -07:00
OMAP: DSS2: OMAPFB: implement OMAPFB_GET_DISPLAY_INFO
2010-02-15 15:14:34 +02:00
padata: Generic parallelization/serialization interface
2010-01-06 19:47:10 +11:00
mm: add new 'read_cache_page_gfp()' helper function
2010-01-27 09:20:03 -08:00
PCI / ACPI / PM: Platform support for PCI PME wake-up
2010-02-22 16:21:02 -08:00
Merge branch 'x86-mrst-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2010-03-07 15:59:39 -08:00
PCI: Make current and maximum bus speeds part of the PCI core
2010-02-22 16:15:17 -08:00
Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty-2.6
2010-03-03 08:47:22 -08:00
x86/PCI: Moorestown PCI support
2010-02-23 23:14:47 -08:00
Merge branch 'master' into percpu
2010-01-05 09:17:33 +09:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu
2010-03-03 07:34:18 -08:00
Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2010-02-28 10:20:25 -08:00
crypto: gcm - Add RFC4543 wrapper for GCM
2010-01-17 21:52:11 +11:00
libphy: add phy_find_first function
2010-02-04 10:23:02 -08:00
pktcdvd: use BIO list management functions
2010-02-24 08:30:08 +01:00
Driver core: make struct platform_driver.id_table const
2010-03-07 17:04:49 -08:00
plist: Fix grammar mistake, and c-style mistake
2010-01-13 10:51:39 +01:00
PM: Provide generic subsystem-level callbacks
2010-03-06 21:28:37 +01:00
PM: Provide generic subsystem-level callbacks
2010-03-06 21:28:37 +01:00
core, x86: make LIST_POISON less deadly
2010-01-11 09:45:37 -08:00
ptrace: Fix ptrace_regset() comments and diagnose errors specifically
2010-02-23 13:45:26 -08:00
quota: stop using QUOTA_OK / NO_QUOTA
2010-03-05 00:20:31 +01:00
dquot: cleanup dquot initialize routine
2010-03-05 00:20:30 +01:00
[SCSI] mpt2sas: Added raid transport support
2010-02-08 18:19:41 -06:00
x86/pci: Add cap_resource()
2010-02-10 17:47:17 -08:00
Merge branch 'master' of /home/davem/src/GIT/linux-2.6/
2010-02-28 19:23:06 -08:00
rcu: Disable lockdep checking in RCU list-traversal primitives
2010-02-25 09:41:02 +01:00
rcu: Make non-RCU_PROVE_LOCKING rcu_read_lock_sched_held() understand boot
2010-02-27 09:53:52 +01:00
rcu: Make rcu_read_lock_sched_held() take boot time into account
2010-02-26 08:20:46 +01:00
rcu: Make rcu_read_lock_sched_held() take boot time into account
2010-02-26 08:20:46 +01:00
pass writeback_control to ->write_inode
2010-03-05 13:25:52 -05:00
resource: move kernel function inside __KERNEL__
2010-01-04 11:33:58 +01:00
PM: Asynchronous suspend and resume of devices
2010-02-26 20:39:09 +01:00
vmscan: detect mapped file pages used only once
2010-03-06 11:26:27 -08:00
rtc/hctosys: only claim the RTC provided the system time if it did
2010-03-12 15:52:28 -08:00
Merge branch 'master' of /home/davem/src/GIT/linux-2.6/
2010-02-28 19:23:06 -08:00
mm: avoid false sharing of mm_counter
2010-03-06 11:26:24 -08:00
Security: add static to security_ops and default_security_ops variable
2010-02-24 08:11:02 +11:00
seq_file: add RCU versions of new hlist/list iterators (v3)
2010-02-22 15:45:54 -08:00
serial: sh-sci: Add DMA support.
2010-03-02 11:39:15 +09:00
Merge commit 'v2.6.33-rc5' into next
2010-01-21 23:55:25 -08:00
sh: extend INTC with force_disable
2010-02-16 13:38:56 +09:00
net: fix protocol sk_buff field
2010-03-02 03:05:05 -08:00
failslab: add ability to filter slab caches
2010-02-26 19:19:39 +02:00
SLUB: this_cpu: Remove slub kmem_cache fields
2009-12-20 10:17:59 +02:00
smp: fix documentation in include/linux/smp.h
2010-03-06 11:26:32 -08:00
xfrm: Introduce LINUX_MIB_XFRMFWDHDRERROR
2010-02-18 15:43:09 -08:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu
2010-03-03 07:34:18 -08:00
stmmac: add the new Header file for stmmac platform data
2010-01-07 17:06:06 -08:00
lib: Introduce strnstr()
2010-01-14 22:38:09 -05:00
Add generic sys_olduname()
2010-03-12 15:52:32 -08:00
net neigh: Decouple per interface neighbour table controls from binary sysctls
2010-02-16 15:55:18 -08:00
sysdev: Add sysdev_create/remove_files
2010-03-07 17:04:47 -08:00
sysfs: fix for thinko with sysfs_bin_attr_init()
2010-03-07 17:04:52 -08:00
syslog: use defined constants instead of raw numbers
2010-02-04 14:20:41 +11:00
net: TCP thin dupack
2010-02-18 15:43:09 -08:00
ntp: Make time_esterror and time_maxerror static
2010-01-29 10:15:19 +01:00
sched: Fix vmark regression on big machines
2010-01-21 13:39:03 +01:00
tty: Keep the default buffering to sub-page units
2010-03-02 14:43:23 -08:00
USB: tty: Add a function to insert a string of characters with the same flag
2010-03-02 14:55:11 -08:00
maccess,probe_kernel: Allow arch specific override probe_kernel_(read|write)
2010-01-07 11:58:36 -06:00
Driver core: create lock/unlock functions for struct device
2010-03-07 17:04:52 -08:00
vga_switcheroo: fix build on platforms with no ACPI
2010-03-01 22:21:58 +11:00
vhost_net: a kernel-level virtio server
2010-01-15 01:43:29 -08:00
V4L/DVB (14003): gspca_cpai1: New gspca subdriver for CPIA CPiA version 1 cams
2010-02-26 15:10:40 -03:00
virtio: Add ability to detach unused buffers from vrings
2010-02-24 14:22:27 +10:30
net/9p: Remove MAX_9P_CHAN limit
2010-03-05 15:04:41 -06:00
virtio: Add memory statistics reporting to the balloon driver (V4)
2010-02-24 14:22:08 +10:30
virtio_blk: add block topology support
2010-02-24 14:22:26 +10:30
virtio: console: Add ability to hot-unplug ports
2010-02-24 14:23:00 +10:30
Merge branch 'master' into percpu
2010-01-05 09:17:33 +09:00
tty: Add a new VT mode which is like VT_PROCESS but doesn't require a VT_RELDISP ioctl call
2010-03-02 14:43:23 -08:00
fs-writeback: Add helper function to start writeback if idle
2009-12-23 07:57:07 -05:00
xfrm: introduce basic mark infrastructure
2010-02-22 16:19:45 -08:00
