Matt Helsley
5a7aadfe2f
Freezer: Fix buggy resume test for tasks frozen with cgroup freezer ...
When the cgroup freezer is used to freeze tasks we do not want to thaw
those tasks during resume. Currently we test the cgroup freezer
state of the resuming tasks to see if the cgroup is FROZEN. If so
then we don't thaw the task. However, the FREEZING state also indicates
that the task should remain frozen.
This also avoids a problem pointed out by Oren Ladaan: the freezer state
transition from FREEZING to FROZEN is updated lazily when userspace reads
or writes the freezer.state file in the cgroup filesystem. This means that
resume will thaw tasks in cgroups which should be in the FROZEN state if
there is no read/write of the freezer.state file to trigger this
transition before suspend.
NOTE: Another "simple" solution would be to always update the cgroup
freezer state during resume. However it's a bad choice for several reasons:
Updating the cgroup freezer state is somewhat expensive because it requires
walking all the tasks in the cgroup and checking if they are each frozen.
Worse, this could easily make resume run in N^2 time where N is the number
of tasks in the cgroup. Finally, updating the freezer state from this code
path requires trickier locking because of the way locks must be ordered.
Instead of updating the freezer state we rely on the fact that lazy
updates only manage the transition from FREEZING to FROZEN. We know that
a cgroup with the FREEZING state may actually be FROZEN so test for that
state too. This makes sense in the resume path even for partially-frozen
cgroups -- those that really are FREEZING but not FROZEN.
Reported-by: Oren Ladaan <orenl@cs.columbia.edu>
Signed-off-by: Matt Helsley <matthltc@us.ibm.com>
Cc: stable@kernel.org
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2010-03-26 23:51:44 +01:00
Video: ARM CLCD: Better fix for swapped IENB and CNTL registers
2010-03-14 19:42:44 +00:00
decompress: fix new decompressor for PIC
2010-03-12 15:52:44 -08:00
mfd: Introduce remove_script function for twl4030
2010-03-07 22:17:32 +01:00
mfd: Fix ucb1x00 build failure for collie_defconfig
2010-03-07 22:17:39 +01:00
mmc: fix incorrect interpretation of card type bits
2010-03-24 16:31:21 -07:00
netfilter: ctnetlink: fix reliable event delivery if message building fails
2010-03-20 14:29:03 -07:00
regulator: enable max8649 regulator driver
2010-03-03 14:49:24 +00:00
backlight: Add Epson L4F00242T03 LCD driver
2010-03-16 19:47:53 +00:00
SUNRPC: Fix a use after free bug with the NFSv4.1 backchannel
2010-03-22 05:32:44 -04:00
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
sysctl extern cleanup: acct
2010-03-12 15:53:10 -08:00
ata: Detect Delkin Devices compact flash
2010-03-01 15:11:32 -05:00
backlight: Allow properties to be passed at registration
2010-03-16 19:47:54 +00:00
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
cgroups: remove events before destroying subsystem state objects
2010-03-12 15:52:37 -08:00
Document Linux's circular buffering capabilities
2010-03-24 16:31:22 -07:00
Add generic sys_old_select()
2010-03-12 15:52:32 -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
rcu: Use wrapper function instead of exporting tasklist_lock
2010-03-04 11:46:14 +01:00
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
dma-mapping: dma-mapping.h: add dma_set_coherent_mask
2010-03-12 15:52:42 -08:00
Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx
2010-03-04 08:20:14 -08:00
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
ethtool: Add direct access to ops->get_sset_count
2010-03-05 14:00:17 -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
memory-hotplug: create /sys/firmware/memmap entry for new memory
2010-03-06 11:26:25 -08:00
Freezer: Fix buggy resume test for tasks frozen with cgroup freezer
2010-03-26 23:51:44 +01:00
include/linux/fs.h: convert FMODE_* constants to hex
2010-03-06 11:26:25 -08:00
perf: Drop the obsolete profile naming for trace events
2010-03-10 14:47:18 +01:00
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
mfd: Add HTCPLD driver
2010-03-07 22:17:09 +01:00
i2c-algo-bit: Add pre- and post-xfer hooks
2010-03-13 20:56:56 +01:00
i2c: Add SMBus alert support
2010-03-02 12:23:42 +01:00
Add the platform data include for the Xilinx XPS IIC Bus Interface
2010-03-14 11:14:58 -07:00
i2c: Document the message size limit
2010-03-02 12:23:49 +01:00
if_tunnel.h: add missing ams/byteorder.h include
2010-03-21 21:19:02 -07:00
nsproxy: remove INIT_NSPROXY()
2010-03-12 15:52:40 -08:00
Input: scancode in get/set_keycodes should be unsigned
2010-03-08 23:19:15 -08:00
cgroups: blkio subsystem as module
2010-03-12 15:52:36 -08:00
resource: add window support
2010-03-14 20:08:36 -04:00
nsproxy: remove INIT_NSPROXY()
2010-03-12 15:52:40 -08:00
ipmi: remove ipmi_smi.h self-include
2010-03-12 15:52:40 -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
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
kfifo: fix KFIFO_INIT in include/linux/kfifo.h
2010-03-24 16:31:20 -07:00
sysctl extern cleanup: module
2010-03-12 15:53:10 -08:00
Driver core: Constify struct sysfs_ops in struct kobj_type
2010-03-07 17:04:49 -08:00
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
sysctl extern cleanup: lockdep
2010-03-12 15:53:10 -08:00
memcg: fix oom kill behavior
2010-03-12 15:52:38 -08:00
memory hotplug: allow setting of phys_device
2010-03-17 18:43:47 -07:00
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
Merge branch 'for-next' into for-linus
2010-03-08 16:55:37 +01:00
take check for new events in namespace (guts of mounts_poll()) to namespace.c
2010-03-03 14:07:59 -05:00
sysctl extern cleanup: module
2010-03-12 15:53:10 -08:00
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
net: Potential null skb->dev dereference
2010-03-18 21:16:45 -07:00
netfilter: ip6table_raw: fix table priority
2010-03-25 11:17:26 +01:00
netlink: fix NETLINK_RECV_NO_ENOBUFS in netlink_set_err()
2010-03-20 14:29:03 -07:00
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
nodemask: fix the declaration of NODEMASK_ALLOC()
2010-03-12 15:52:38 -08:00
of: Fix comparison of "compatible" properties
2010-03-18 07:30:31 -06:00
memcg: move charges of anonymous swap
2010-03-12 15:52:36 -08:00
dma-mapping.h: add the dma_unmap state API
2010-03-12 15:52:42 -08:00
dma-mapping: pci: move pci_set_dma_mask and pci_set_consistent_dma_mask to pci-dma-compat.h
2010-03-12 15:52:42 -08:00
Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty-2.6
2010-03-03 08:47:22 -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
perf, ppc: Fix compile error due to new cpu notifiers
2010-03-11 15:21:27 +01:00
Driver core: make struct platform_driver.id_table const
2010-03-07 17:04:49 -08:00
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
sysctl extern cleanup: poll
2010-03-12 15:53:11 -08:00
ptrace: move user_enable_single_step & co prototypes to linux/ptrace.h
2010-03-12 15:52:38 -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
Merge branch 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2010-03-13 14:43:01 -08:00
sysctl extern cleanup: C_A_D
2010-03-12 15:52:44 -08:00
pass writeback_control to ->write_inode
2010-03-05 13:25:52 -05:00
reiserfs: fix oops while creating privroot with selinux enabled
2010-03-24 16:31:21 -07:00
rfkill: Add support for KEY_RFKILL
2010-03-02 14:28:49 -05:00
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
sysctl extern cleanup: rtmutex
2010-03-12 15:53:10 -08:00
locking: Make sparse work with inline spinlocks and rwlocks
2010-03-13 01:21:21 +01:00
Merge branch 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2010-03-13 14:43:01 -08:00
pps: serial clients support
2010-03-12 15:52:43 -08:00
serial: sh-sci: Fix build failure for non-sh architectures.
2010-03-10 11:55:05 +09:00
sysctl extern cleanup: signal
2010-03-12 15:52:44 -08:00
skbuff: remove unused dma_head & dma_maps fields
2010-03-24 11:13:35 -07:00
smp: fix documentation in include/linux/smp.h
2010-03-06 11:26:32 -08:00
tcp: Add SNMP counters for backlog and min_ttl drops
2010-03-08 10:45:27 -08:00
locking: Make sparse work with inline spinlocks and rwlocks
2010-03-13 01:21:21 +01:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu
2010-03-03 07:34:18 -08:00
memcg: move charges of anonymous swap
2010-03-12 15:52:36 -08:00
Fix up prototype for sys_ipc breakage
2010-03-22 13:12:33 -07:00
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
copy_signal() cleanup: kill taskstats_tgid_init() and acct_init_pacct()
2010-03-12 15:52:39 -08:00
tty_port,usb-console: Fix usb serial console open/close regression
2010-03-19 07:17:57 -07:00
USB: tty: Add a function to insert a string of characters with the same flag
2010-03-02 14:55:11 -08:00
ldisc: new dcd_change() method for line disciplines
2010-03-12 15:52:43 -08:00
USB: Fix usb_fill_int_urb for SuperSpeed devices
2010-03-19 07:24:23 -07:00
net/9p: Add sysfs mount_tag file for virtio 9P device
2010-03-13 08:57:29 -06:00
net/9p: Use the tag name in the config space for identifying mount point
2010-03-13 08:57:28 -06:00
Revert "tty: Add a new VT mode which is like VT_PROCESS but doesn't require a VT_RELDISP ioctl call"
2010-03-19 07:17:52 -07:00
