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
Power management and ACPI material for v4.2-rc1
2015-06-23 14:18:07 -07:00
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
regmap: Fixes for v4.2
2015-06-23 17:25:32 -07:00
SCSI misc on 20150622
2015-06-23 15:55:44 -07:00
Power management and ACPI material for v4.2-rc1
2015-06-23 14:18:07 -07:00
powerpc updates for 4.2
2015-06-24 08:46:32 -07:00
fbdev changes for 4.2
2015-06-23 16:23:30 -07:00
clocksource: Increase dependencies of timer-stm32 to limit build wreckage
2015-06-21 20:01:48 +02:00
Power management and ACPI material for v4.2-rc1
2015-06-23 14:18:07 -07:00
Merge branch 'pm-cpuidle'
2015-06-22 15:15:36 +02:00
Power management and ACPI material for v4.2-rc1
2015-06-23 14:18:07 -07:00
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
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
This is the big bulk of GPIO changes queued for the v4.2
2015-06-23 13:34:02 -07:00
Power management and ACPI material for v4.2-rc1
2015-06-23 14:18:07 -07:00
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: nokia-modem: use flags argument of devm_gpiod_get to set direction
2015-06-23 02:40:03 +02:00
hwmon changes for v4.2
2015-06-23 13:39:56 -07:00
hwtracing /coresight
== Changes to existing drivers ==
2015-06-23 17:31:27 -07:00
SCSI misc on 20150622
2015-06-23 15:55:44 -07:00
== Changes to existing drivers ==
2015-06-23 17:31:27 -07:00
IOMMU Updates for Linux v4.2
2015-06-23 18:27:19 -07:00
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
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
2015-06-23 14:08:54 -07:00
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/nvram: Remove as unused
2015-06-15 16:42:37 +10:00
md: make sure MD_RECOVERY_DONE is clear before starting recovery/resync
2015-06-12 20:16:33 +10:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
2015-06-23 14:08:54 -07:00
fusion: remove dead MTRR code
2015-06-13 08:44:14 -07:00
== Changes to existing drivers ==
2015-06-23 17:31:27 -07:00
cxl: Fix typo in debug print
2015-06-19 17:10:30 +10:00
mmc: queue: prevent soft lockups on PREEMPT=n
2015-06-18 09:21:04 +02:00
powerpc updates for 4.2
2015-06-24 08:46:32 -07:00
Changes for 4.2
2015-06-23 15:53:26 -07:00
PCI changes for the v4.2 merge window:
2015-06-23 13:41:24 -07:00
arm64 updates for 4.2, mostly refactoring/clean-up:
2015-06-24 10:02:15 -07:00
Power management and ACPI material for v4.2-rc1
2015-06-23 14:18:07 -07:00
pcmcia: do not break rsrc_nonstatic when handling anonymous cards
2015-06-16 07:29:39 +02:00
== Changes to existing drivers ==
2015-06-23 17:31:27 -07:00
Merge branches 'pnp' and 'pm-tools'
2015-06-19 01:18:43 +02:00
power supply and reset changes for the v4.2 series
2015-06-23 16:10:27 -07:00
pwm: Changes for v4.2-rc1
2015-06-23 13:32:38 -07:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
2015-06-23 14:08:54 -07:00
== Changes to existing drivers ==
2015-06-23 17:31:27 -07:00
== Changes to existing drivers ==
2015-06-23 17:31:27 -07:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
2015-06-24 08:45:27 -07:00
SCSI misc on 20150622
2015-06-23 15:55:44 -07:00
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
SSB: Fix handling of ssb_pmu_get_alp_clock()
2015-06-09 16:38:06 +02:00
mm: oom_kill: clean up victim marking and exiting interfaces
2015-06-24 17:49:43 -07:00
SCSI misc on 20150622
2015-06-23 15:55:44 -07:00
mm: oom_kill: simplify OOM killer locking
2015-06-24 17:49:43 -07:00
SCSI misc on 20150622
2015-06-23 15:55:44 -07:00
powerpc updates for 4.2
2015-06-24 08:46:32 -07:00
SCSI misc on 20150622
2015-06-23 15:55:44 -07:00
fbdev changes for 4.2
2015-06-23 16:23:30 -07:00
PCI changes for the v4.2 merge window:
2015-06-23 13:41:24 -07:00
SCSI misc on 20150622
2015-06-23 15:55:44 -07:00
dc56401fc9