David Rientjes 2ff05b2b4e oom: move oom_adj value from task_struct to mm_struct ... The per-task oom_adj value is a characteristic of its mm more than the task itself since it's not possible to oom kill any thread that shares the mm. If a task were to be killed while attached to an mm that could not be freed because another thread were set to OOM_DISABLE, it would have needlessly been terminated since there is no potential for future memory freeing. This patch moves oomkilladj (now more appropriately named oom_adj) from struct task_struct to struct mm_struct. This requires task_lock() on a task to check its oom_adj value to protect against exec, but it's already necessary to take the lock when dereferencing the mm to find the total VM size for the badness heuristic. This fixes a livelock if the oom killer chooses a task and another thread sharing the same memory has an oom_adj value of OOM_DISABLE. This occurs because oom_kill_task() repeatedly returns 1 and refuses to kill the chosen task while select_bad_process() will repeatedly choose the same task during the next retry. Taking task_lock() in select_bad_process() to check for OOM_DISABLE and in oom_kill_task() to check for threads sharing the same memory will be removed in the next patch in this series where it will no longer be necessary. Writing to /proc/pid/oom_adj for a kthread will now return -EINVAL since these threads are immune from oom killing already. They simply report an oom_adj value of OOM_DISABLE. Cc: Nick Piggin <npiggin@suse.de> Cc: Rik van Riel <riel@redhat.com> Cc: Mel Gorman <mel@csn.ul.ie> Signed-off-by: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2009-06-16 19:47:43 -07:00
..
ABI	Merge branch 'for-2.6.31' of git://git.kernel.dk/linux-2.6-block	2009-06-11 11:10:35 -07:00
accounting
acpi
aoe
arm	[ARM] S3C24XX: GPIO: Change to macros for GPIO numbering	2009-05-18 16:26:03 +01:00
auxdisplay
blackfin	Blackfin arch: Add document about bfin-gpio	2009-01-07 23:14:38 +08:00
block	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
blockdev	mflash: initial support	2009-04-07 08:12:38 +02:00
cdrom
cgroups	memcg: fix documentation	2009-04-13 15:04:33 -07:00
connector
console
cpu-freq
cpuidle
cris
crypto
development-process	docs: Encourage better changelogs in the development process document	2009-06-04 10:32:49 -06:00
device-mapper
DocBook	Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux-2.6	2009-06-15 03:02:23 -07:00
driver-model	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
dvb
early-userspace
fault-injection
fb	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
filesystems	oom: move oom_adj value from task_struct to mm_struct	2009-06-16 19:47:43 -07:00
firmware_class
frv
hwmon	hwmon: Update documentation on fan_max	2009-06-01 13:46:50 +02:00
i2c	i2c-ocores: Can add I2C devices to the bus	2009-06-13 10:39:28 +01:00
i2o
ia64
ide	ide: preserve Host Protected Area by default (v2)	2009-06-07 13:52:52 +02:00
infiniband	IPoIB: Document newish features	2009-04-08 13:52:01 -07:00
input	Input: multitouch - augment event semantics documentation	2009-05-23 09:53:26 -07:00
ioctl
isdn	isdn: extend INTERFACE.CAPI document	2009-06-08 00:45:52 -07:00
ja_JP
kbuild	kconfig: resort the documentation of the environment variables	2009-06-09 22:37:47 +02:00
kdump	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
ko_KR
laptops	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
lguest	lguest: add support for indirect ring entries	2009-06-12 22:27:13 +09:30
m68k
make
mips
misc-devices
mn10300	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
mtd	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
namespaces
netlabel
networking	Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux-2.6	2009-06-15 03:02:23 -07:00
parisc
PCI
pcmcia
power	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2009-06-14 13:46:25 -07:00
powerpc	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6	2009-06-15 09:40:05 -07:00
prctl
RCU	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
s390	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
scheduler	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
scsi	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
serial
sh
sound	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2009-06-14 13:46:25 -07:00
sparc
spi	spi: documentation: emphasise spi_master.setup() semantics	2009-04-21 13:41:50 -07:00
sysctl	page allocator: use allocation flags as an index to the zone watermark	2009-06-16 19:47:35 -07:00
telephony
thermal
timers	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
trace	trivial: Remove the hyphen from git commands	2009-06-12 18:01:51 +02:00
uml
usb	trivial: usb: fix missing space typo in doc	2009-06-12 18:01:51 +02:00
video4linux	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
vm	pagemap: add page-types tool	2009-06-16 19:47:38 -07:00
w1
watchdog
wimax
x86	Merge branch 'linus' into x86/mce3	2009-06-11 23:31:52 +02:00
zh_CN
00-INDEX
applying-patches.txt
atomic_ops.txt
bad_memory.txt
basic_profiling.txt
binfmt_misc.txt
braille-console.txt	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
bt8xxgpio.txt
BUG-HUNTING
c2port.txt
cachetlb.txt
Changes	Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/sam/kbuild-next	2009-06-14 14:12:18 -07:00
CodingStyle	trivial: fix typo milisecond/millisecond for documentation and source comments.	2009-06-12 18:01:46 +02:00
cpu-hotplug.txt
cpu-load.txt
cputopology.txt
credentials.txt
dcdbas.txt
debugging-modules.txt
debugging-via-ohci1394.txt
dell_rbu.txt	trivial: Documentation/dell_rbu.txt: fix typos	2009-06-12 18:01:50 +02:00
devices.txt	lanana: assign a device name and numbering for MAX3100	2009-04-07 08:44:05 -07:00
DMA-API.txt	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
DMA-attributes.txt
DMA-ISA-LPC.txt
DMA-mapping.txt	dma-mapping: update the old macro DMA_nBIT_MASK related documentations	2009-04-07 08:31:12 -07:00
dmaengine.txt
dontdiff
dynamic-debug-howto.txt
edac.txt	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
eisa.txt
email-clients.txt
exception.txt
feature-removal-schedule.txt	Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux-2.6	2009-06-15 03:02:23 -07:00
futex-requeue-pi.txt	futex: add requeue-pi documentation	2009-05-09 07:12:50 +02:00
gpio.txt	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
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	kernel-doc: restrict syntax for private: and public:	2009-05-02 15:36:10 -07:00
kernel-docs.txt
kernel-parameters.txt	Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc	2009-06-15 09:32:52 -07:00
keys-request-key.txt
keys.txt
kmemleak.txt	kmemleak: Add documentation on the memory leak detector	2009-06-11 17:03:29 +01:00
kobject.txt	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
kprobes.txt	kprobes: support kretprobe and jprobe per-probe disabling	2009-04-07 08:31:08 -07:00
kref.txt
ldm.txt
leds-class.txt
local_ops.txt	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
lockdep-design.txt	locking: Documentation: lockdep-design.txt, fix note of state bits	2009-04-26 18:21:24 +02:00
lockstat.txt
logo.gif	Revert "linux.conf.au 2009: Tuz"	2009-04-27 12:00:27 -07:00
logo.txt	Revert "linux.conf.au 2009: Tuz"	2009-04-27 12:00:27 -07:00
magic-number.txt
Makefile
ManagementStyle
markers.txt
mca.txt
md.txt
memory-barriers.txt	sched: Document memory barriers implied by sleep/wake-up primitives	2009-04-29 14:15:55 +02:00
memory-hotplug.txt	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
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	trivial: rbtree.txt: fix rb_entry() parameters in sample code	2009-06-12 18:01:47 +02:00
rfkill.txt	rfkill: document /dev/rfkill	2009-06-03 14:06:15 -04:00
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
slow-work.txt
SM501.txt	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
Smack.txt	smack: implement logging V3	2009-04-14 09:00:23 +10:00
sparse.txt	Documentation: explain the difference between __bitwise and __bitwise__	2009-04-11 08:18:11 +02:00
spinlocks.txt
stable_api_nonsense.txt
stable_kernel_rules.txt
SubmitChecklist
SubmittingDrivers
SubmittingPatches	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2009-06-14 13:46:25 -07:00
svga.txt
sysfs-rules.txt	Doc/sysfs-rules: Swap the order of the words so the sentence makes more sense	2009-05-08 19:22:20 -07:00
sysrq.txt
tomoyo.txt	tomoyo: add Documentation/tomoyo.txt	2009-04-14 09:14:58 +10:00
unaligned-memory-access.txt
unicode.txt
unshare.txt
VGA-softcursor.txt
video-output.txt
volatile-considered-harmful.txt
voyager.txt
zorro.txt