Michal Hocko f61c42a7d9 memcg: remove tasks/children test from mem_cgroup_force_empty() ... Tejun has correctly pointed out that tasks/children test in mem_cgroup_force_empty is not correct because there is no other locking which preserves this state throughout the rest of the function so both new tasks can join the group or new children groups can be added while somebody is writing to memory.force_empty. A new task would break mem_cgroup_reparent_charges expectation that all failures as described by mem_cgroup_force_empty_list are temporal and there is no way out. The main use case for the knob as described by Documentation/cgroups/memory.txt is to: " The typical use case for this interface is before calling rmdir(). Because rmdir() moves all pages to parent, some out-of-use page caches can be moved to the parent. If you want to avoid that, force_empty will be useful. " This means that reparenting is not really required as rmdir will reparent pages implicitly from the safe context. If we remove it from mem_cgroup_force_empty then we are safe even with existing tasks because the number of reclaim attempts is bounded. Moreover the knob still does what the documentation claims (modulo reparenting which doesn't make any difference) and users might expect. Longterm we want to deprecate the whole knob and put the reparented pages to the tail of parent LRU during cgroup removal. tj: Removed unused variable @cgrp from mem_cgroup_force_empty() Signed-off-by: Michal Hocko <mhocko@suse.cz> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Acked-by: Li Zefan <lizefan@huawei.com> Signed-off-by: Tejun Heo <tj@kernel.org>		2014-05-16 13:22:48 -04:00
..
ABI	More ACPI and power management fixes and updates for 3.15-rc1	2014-04-11 13:20:04 -07:00
DocBook	Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux	2014-04-19 10:35:30 -07:00
EDID	…
PCI	Merge branch 'pci/dead-code' into next	2014-02-20 14:32:34 -07:00
RCU	documentation: Fix some inconsistencies in RTFP.txt	2014-02-17 14:56:10 -08:00
accounting	…
acpi	ACPI and power management updates for 3.14-rc1	2014-01-24 15:51:02 -08:00
aoe	…
arm	Merge branch 'mvebu/soc3' into next/dt	2014-03-17 12:13:09 +01:00
arm64	- Documentation clarification on CPU topology and booting requirements	2014-04-08 12:06:03 -07:00
auxdisplay	…
backlight	…
blackfin	Documentation/: update 00-INDEX files	2014-02-10 16:01:40 -08:00
block	Documentation/: update 00-INDEX files	2014-02-10 16:01:40 -08:00
blockdev	zram: propagate error to user	2014-04-07 16:36:02 -07:00
bus-devices	…
cdrom	…
cgroups	memcg: remove tasks/children test from mem_cgroup_force_empty()	2014-05-16 13:22:48 -04:00
connector	connector: add portid to unicast in addition to broadcasting	2014-02-07 15:40:17 -08:00
console	…
cpu-freq	cpufreq: Add stop CPU callback to cpufreq_driver interface	2014-03-20 03:50:12 +01:00
cpuidle	…
cris	…
crypto	…
development-process	…
device-mapper	dm: add era target	2014-03-27 16:56:23 -04:00
devicetree	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2014-04-18 17:53:46 -07:00
driver-model	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2014-01-22 21:21:55 -08:00
dvb	Linux 3.14-rc5	2014-03-11 06:55:49 -03:00
early-userspace	…
extcon	…
fault-injection	…
fb	Documentation/: update 00-INDEX files	2014-02-10 16:01:40 -08:00
filesystems	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2014-04-12 14:49:50 -07:00
firmware_class	…
fmc	FMC: make eeprom attribute writable	2014-02-28 15:12:08 -08:00
frv	…
gpio	gpio: make gpiod_direction_output take a logical value	2014-02-07 09:47:02 +01:00
hid	HID: uhid: Add UHID_CREATE2 + UHID_INPUT2	2014-04-01 18:27:33 +02:00
hwmon	Merge branch 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging	2014-04-05 18:45:11 -07:00
i2c	Documentation: i2c: improve section about flags mangling the protocol	2014-04-06 13:53:48 +02:00
i2o	…
ia64	…
ide	Documentation/: update 00-INDEX files	2014-02-10 16:01:40 -08:00
infiniband	…
input	doc: fix double words	2014-03-21 13:16:58 +01:00
ioctl	s390/hypfs: add interface for diagnose 0x304	2014-01-24 09:40:59 +01:00
isdn	…
ja_JP	Documentation: Update stable address in Chinese and Japanese translations	2014-04-16 14:13:27 -07:00
kbuild	kconfig: make allnoconfig disable options behind EMBEDDED and EXPERT	2014-04-07 16:36:09 -07:00
kdump	…
ko_KR	…
laptops	Documentation/: update 00-INDEX files	2014-02-10 16:01:40 -08:00
leds	Documentation/: update 00-INDEX files	2014-02-10 16:01:40 -08:00
m68k	Documentation/: update 00-INDEX files	2014-02-10 16:01:40 -08:00
make	…
memory-devices	…
metag	…
mic	…
mips	…
misc-devices	Merge branch 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging	2014-01-29 18:56:27 -08:00
mmc	…
mn10300	…
mtd	…
namespaces	…
netlabel	…
networking	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	2014-04-02 20:53:45 -07:00
nfc	…
parisc	…
pcmcia	…
phy	phy: Add new Exynos USB 2.0 PHY driver	2014-03-08 12:39:44 +05:30
power	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2014-04-02 16:23:38 -07:00
powerpc	…
pps	…
prctl	…
pti	…
ptp	ptp: Fix compiler warnings in the testptp utility	2014-03-27 14:51:47 -04:00
rapidio	rapidio: rework device hierarchy and introduce mport class of devices	2014-04-07 16:36:07 -07:00
s390	Documentation/: update 00-INDEX files	2014-02-10 16:01:40 -08:00
scheduler	asm/system.h: clean asm/system.h from docs	2014-04-07 16:36:11 -07:00
scsi	[SCSI] megaraid_sas: Version and Changelog update	2014-03-15 10:19:21 -07:00
security	doc: fix double words	2014-03-21 13:16:58 +01:00
serial	Documentation/serial: Delete obsolete driver documentation	2014-04-16 14:20:34 -07:00
sh	…
sound	x86, platforms: Remove SGI Visual Workstation	2014-02-27 08:07:39 -08:00
spi	Merge remote-tracking branches 'spi/topic/s3c64xx', 'spi/topic/sc18is602', 'spi/topic/sh-hspi', 'spi/topic/sh-msiof', 'spi/topic/sh-sci', 'spi/topic/sirf' and 'spi/topic/spidev' into spi-next	2014-03-30 00:51:34 +00:00
sysctl	hung_task: check the value of "sysctl_hung_task_timeout_sec"	2014-04-07 16:36:07 -07:00
target	…
thermal	…
timers	Documentation/: update 00-INDEX files	2014-02-10 16:01:40 -08:00
tpm	…
trace	Most of the changes were largely clean ups, and some documentation.	2014-04-03 10:26:31 -07:00
usb	doc: fix double words	2014-03-21 13:16:58 +01:00
vDSO	…
video4linux	[media] s5p-fimc: Remove reference to outdated macro	2014-03-14 10:37:43 -03:00
virtual	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2014-04-02 16:23:38 -07:00
vm	Documentation/vm/numa_memory_policy.txt: fix wrong document in numa_memory_policy.txt	2014-04-18 16:40:08 -07:00
w1	Merge 3.14-rc3 into char-misc-next	2014-02-18 08:09:40 -08:00
watchdog	watchdog: it87_wdt: Work around non-working CIR interrupts	2014-03-31 13:33:55 +02:00
wimax	…
x86	x86, boot: Correct max ramdisk size name	2014-03-13 15:32:42 -07:00
xtensa	…
zh_CN	driver core fixes for 3.15-rc2	2014-04-18 16:59:52 -07:00
.gitignore	…
00-INDEX	Merge branch 'x86-nuke-platforms-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2014-04-02 13:15:58 -07:00
BUG-HUNTING	…
Changes	…
CodingStyle	…
DMA-API-HOWTO.txt	…
DMA-API.txt	…
DMA-ISA-LPC.txt	…
DMA-attributes.txt	…
HOWTO	…
IPMI.txt	…
IRQ-affinity.txt	…
IRQ-domain.txt	…
IRQ.txt	…
Intel-IOMMU.txt	…
Makefile	…
ManagementStyle	…
SAK.txt	…
SM501.txt	…
SecurityBugs	…
SubmitChecklist	…
SubmittingDrivers	…
SubmittingPatches	Documentation/SubmittingPatches: update some dead URLs	2014-04-03 16:21:27 -07:00
VGA-softcursor.txt	…
applying-patches.txt	…
assoc_array.txt	…
atomic_ops.txt	…
bad_memory.txt	…
basic_profiling.txt	…
bcache.txt	…
binfmt_misc.txt	…
braille-console.txt	…
bt8xxgpio.txt	…
btmrvl.txt	…
bus-virt-phys-mapping.txt	…
cachetlb.txt	…
circular-buffers.txt	…
clk.txt	Documentation: clk: Add locking documentation	2014-03-19 14:56:06 -07:00
coccinelle.txt	…
cpu-hotplug.txt	Doc/cpu-hotplug: Specify race-free way to register CPU hotplug callbacks	2014-03-20 13:43:40 +01:00
cpu-load.txt	…
cputopology.txt	…
crc32.txt	…
dcdbas.txt	…
debugging-modules.txt	…
debugging-via-ohci1394.txt	…
dell_rbu.txt	…
devices.txt	Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media	2014-04-04 09:50:07 -07:00
digsig.txt	…
dma-buf-sharing.txt	…
dmaengine.txt	…
dmatest.txt	…
dontdiff	Documentation: LLVMLinux: Update Documentation/dontdiff	2014-04-09 13:44:34 -07:00
dynamic-debug-howto.txt	dynamic-debug-howto.txt: update since new wildcard support	2014-01-23 16:36:55 -08:00
edac.txt	[media, edac] Change my email address	2014-02-07 08:03:07 -02:00
efi-stub.txt	…
eisa.txt	…
email-clients.txt	…
flexible-arrays.txt	…
futex-requeue-pi.txt	doc: fix double words	2014-03-21 13:16:58 +01:00
gcov.txt	…
highuid.txt	…
hw_random.txt	…
hwspinlock.txt	…
init.txt	…
initrd.txt	…
intel_txt.txt	…
io-mapping.txt	…
io_ordering.txt	…
iostats.txt	…
irqflags-tracing.txt	asm/system.h: clean asm/system.h from docs	2014-04-07 16:36:11 -07:00
isapnp.txt	…
java.txt	…
kernel-doc-nano-HOWTO.txt	…
kernel-docs.txt	…
kernel-parameters.txt	Documentation/serial: Delete obsolete driver documentation	2014-04-16 14:20:34 -07:00
kernel-per-CPU-kthreads.txt	Documentation/kernel-per-CPU-kthreads.txt: Workqueue affinity	2014-02-17 14:56:08 -08:00
kmemcheck.txt	doc: fix double words	2014-03-21 13:16:58 +01:00
kmemleak.txt	Documentation/kmemleak.txt: updates	2014-04-03 16:21:27 -07:00
kobject.txt	…
kprobes.txt	…
kref.txt	…
ldm.txt	…
local_ops.txt	…
lockdep-design.txt	…
lockstat.txt	…
lockup-watchdogs.txt	…
logo.gif	…
logo.txt	…
magic-number.txt	Documentation/serial: Delete obsolete driver documentation	2014-04-16 14:20:34 -07:00
md.txt	…
media-framework.txt	…
memory-barriers.txt	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2014-04-02 16:23:38 -07:00
memory-hotplug.txt	…
module-signing.txt	Nothing major: the stricter permissions checking for sysfs broke	2014-04-06 09:38:07 -07:00
mono.txt	…
mutex-design.txt	…
nommu-mmap.txt	…
numastat.txt	…
oops-tracing.txt	Use 'E' instead of 'X' for unsigned module taint flag.	2014-03-31 14:52:43 +10:30
padata.txt	…
parport-lowlevel.txt	…
parport.txt	…
percpu-rw-semaphore.txt	…
phy.txt	drivers: phy: Add support for optional phys	2014-02-05 05:48:43 +00:00
pi-futex.txt	…
pinctrl.txt	…
pnp.txt	…
preempt-locking.txt	…
printk-formats.txt	vsprintf: add %pad extension for dma_addr_t use	2014-01-23 16:36:56 -08:00
pwm.txt	…
ramoops.txt	…
rbtree.txt	…
remoteproc.txt	…
rfkill.txt	…
robust-futex-ABI.txt	…
robust-futexes.txt	…
rpmsg.txt	…
rt-mutex-design.txt	…
rt-mutex.txt	…
rtc.txt	…
serial-console.txt	…
sgi-ioc4.txt	…
smsc_ece1099.txt	…
sparse.txt	…
spinlocks.txt	…
stable_api_nonsense.txt	…
stable_kernel_rules.txt	stable_kernel_rules: spelling/word usage	2014-04-16 14:13:26 -07:00
static-keys.txt	…
svga.txt	…
sysfs-rules.txt	…
sysrq.txt	…
this_cpu_ops.txt	…
unaligned-memory-access.txt	…
unicode.txt	…
unshare.txt	…
vfio.txt	…
vgaarbiter.txt	…
video-output.txt	…
vme_api.txt	…
volatile-considered-harmful.txt	…
workqueue.txt	…
ww-mutex-design.txt	…
xz.txt	…
zorro.txt	…