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Johannes Weiner dc56401fc9 mm: oom_kill: simplify OOM killer locking 
The zonelist locking and the oom_sem are two overlapping locks that are
used to serialize global OOM killing against different things.

The historical zonelist locking serializes OOM kills from allocations with
overlapping zonelists against each other to prevent killing more tasks
than necessary in the same memory domain.  Only when neither tasklists nor
zonelists from two concurrent OOM kills overlap (tasks in separate memcgs
bound to separate nodes) are OOM kills allowed to execute in parallel.

The younger oom_sem is a read-write lock to serialize OOM killing against
the PM code trying to disable the OOM killer altogether.

However, the OOM killer is a fairly cold error path, there is really no
reason to optimize for highly performant and concurrent OOM kills.  And
the oom_sem is just flat-out redundant.

Replace both locking schemes with a single global mutex serializing OOM
kills regardless of context.

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Michal Hocko <mhocko@suse.cz>
Acked-by: David Rientjes <rientjes@google.com>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 		2015-06-24 17:49:43 -07:00
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accessibility
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acpi Power management and ACPI material for v4.2-rc1 2015-06-23 14:18:07 -07:00
amba
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android
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ata Merge branch 'for-4.1-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata 2015-06-08 08:47:08 -07:00
atm
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auxdisplay
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base regmap: Fixes for v4.2 2015-06-23 17:25:32 -07:00
bcma
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block SCSI misc on 20150622 2015-06-23 15:55:44 -07:00
bluetooth
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bus Power management and ACPI material for v4.2-rc1 2015-06-23 14:18:07 -07:00
cdrom
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char powerpc updates for 4.2 2015-06-24 08:46:32 -07:00
clk fbdev changes for 4.2 2015-06-23 16:23:30 -07:00
clocksource clocksource: Increase dependencies of timer-stm32 to limit build wreckage 2015-06-21 20:01:48 +02:00
connector
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cpufreq Power management and ACPI material for v4.2-rc1 2015-06-23 14:18:07 -07:00
cpuidle Merge branch 'pm-cpuidle' 2015-06-22 15:15:36 +02:00
crypto Power management and ACPI material for v4.2-rc1 2015-06-23 14:18:07 -07:00
dca
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devfreq
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dio
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dma Merge branch 'x86-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-06-22 17:59:09 -07:00
dma-buf
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edac
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eisa
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extcon
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firewire scsi: Do not set cmd_per_lun to 1 in the host template 2015-05-31 18:06:28 -07:00
firmware Merge branch 'x86-efi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-06-22 17:10:44 -07:00
fmc
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gpio This is the big bulk of GPIO changes queued for the v4.2 2015-06-23 13:34:02 -07:00
gpu Power management and ACPI material for v4.2-rc1 2015-06-23 14:18:07 -07:00
hid Merge branches 'for-4.2/i2c-hid', 'for-4.2/lenovo', 'for-4.2/plantronics', 'for-4.2/rmi', 'for-4.2/sensor-hub', 'for-4.2/sjoy', 'for-4.2/sony' and 'for-4.2/wacom' into for-linus 2015-06-22 16:23:43 +02:00
hsi HSI: nokia-modem: use flags argument of devm_gpiod_get to set direction 2015-06-23 02:40:03 +02:00
hv
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hwmon hwmon changes for v4.2 2015-06-23 13:39:56 -07:00
hwspinlock
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hwtracing/coresight
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i2c == Changes to existing drivers == 2015-06-23 17:31:27 -07:00
ide
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idle
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iio iio: adc: twl6030-gpadc: Fix modalias 2015-05-23 12:30:52 +01:00
infiniband SCSI misc on 20150622 2015-06-23 15:55:44 -07:00
input == Changes to existing drivers == 2015-06-23 17:31:27 -07:00
iommu IOMMU Updates for Linux v4.2 2015-06-23 18:27:19 -07:00
ipack
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irqchip Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-06-22 19:42:56 -07:00
isdn Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2015-06-23 14:08:54 -07:00
leds
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lguest Merge branch 'x86-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-06-22 17:59:09 -07:00
macintosh macintosh/nvram: Remove as unused 2015-06-15 16:42:37 +10:00
mailbox
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mcb
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md md: make sure MD_RECOVERY_DONE is clear before starting recovery/resync 2015-06-12 20:16:33 +10:00
media Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2015-06-23 14:08:54 -07:00
memory
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memstick
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message fusion: remove dead MTRR code 2015-06-13 08:44:14 -07:00
mfd == Changes to existing drivers == 2015-06-23 17:31:27 -07:00
misc cxl: Fix typo in debug print 2015-06-19 17:10:30 +10:00
mmc mmc: queue: prevent soft lockups on PREEMPT=n 2015-06-18 09:21:04 +02:00
mtd powerpc updates for 4.2 2015-06-24 08:46:32 -07:00
net Changes for 4.2 2015-06-23 15:53:26 -07:00
nfc
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ntb PCI changes for the v4.2 merge window: 2015-06-23 13:41:24 -07:00
nubus
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of arm64 updates for 4.2, mostly refactoring/clean-up: 2015-06-24 10:02:15 -07:00
oprofile
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parisc
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parport
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pci Power management and ACPI material for v4.2-rc1 2015-06-23 14:18:07 -07:00
pcmcia pcmcia: do not break rsrc_nonstatic when handling anonymous cards 2015-06-16 07:29:39 +02:00
phy
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pinctrl pinctrl: Fix gpio/pin mapping for Meson8b 2015-05-19 11:40:52 +02:00
platform == Changes to existing drivers == 2015-06-23 17:31:27 -07:00
pnp Merge branches 'pnp' and 'pm-tools' 2015-06-19 01:18:43 +02:00
power power supply and reset changes for the v4.2 series 2015-06-23 16:10:27 -07:00
powercap powercap / RAPL: Support Knights Landing 2015-05-21 02:34:54 +02:00
pps
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ps3
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ptp
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pwm pwm: Changes for v4.2-rc1 2015-06-23 13:32:38 -07:00
rapidio Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2015-06-23 14:08:54 -07:00
ras
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regulator == Changes to existing drivers == 2015-06-23 17:31:27 -07:00
remoteproc
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reset
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rpmsg
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rtc == Changes to existing drivers == 2015-06-23 17:31:27 -07:00
s390 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2015-06-24 08:45:27 -07:00
sbus
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scsi SCSI misc on 20150622 2015-06-23 15:55:44 -07:00
sfi
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sh
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sn
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soc soc: mediatek: Add compile dependency to pmic-wrapper 2015-05-27 16:27:05 +02:00
spi Merge remote-tracking branches 'spi/topic/sirf', 'spi/topic/spidev' and 'spi/topic/zynq' into spi-next 2015-06-18 00:19:56 +01:00
spmi
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ssb SSB: Fix handling of ssb_pmu_get_alp_clock() 2015-06-09 16:38:06 +02:00
staging mm: oom_kill: clean up victim marking and exiting interfaces 2015-06-24 17:49:43 -07:00
target SCSI misc on 20150622 2015-06-23 15:55:44 -07:00
tc
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thermal Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux-soc-thermal into for-rc 2015-05-19 08:12:27 +08:00
thunderbolt
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tty mm: oom_kill: simplify OOM killer locking 2015-06-24 17:49:43 -07:00
uio
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usb SCSI misc on 20150622 2015-06-23 15:55:44 -07:00
uwb
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vfio powerpc updates for 4.2 2015-06-24 08:46:32 -07:00
vhost SCSI misc on 20150622 2015-06-23 15:55:44 -07:00
video fbdev changes for 4.2 2015-06-23 16:23:30 -07:00
virt
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virtio PCI changes for the v4.2 merge window: 2015-06-23 13:41:24 -07:00
vlynq
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vme
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w1
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watchdog
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xen SCSI misc on 20150622 2015-06-23 15:55:44 -07:00
zorro
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Kconfig
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Makefile
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