Tejun Heo be09102b41 mm: memcg: allow lowering memory.swap.max below the current usage ... Currently an attempt to set swap.max into a value lower than the actual swap usage fails, which causes configuration problems as there's no way of lowering the configuration below the current usage short of turning off swap entirely. This makes swap.max difficult to use and allows delegatees to lock the delegator out of reducing swap allocation. This patch updates swap_max_write() so that the limit can be lowered below the current usage. It doesn't implement active reclaiming of swap entries for the following reasons. * mem_cgroup_swap_full() already tells the swap machinary to aggressively reclaim swap entries if the usage is above 50% of limit, so simply lowering the limit automatically triggers gradual reclaim. * Forcing back swapped out pages is likely to heavily impact the workload and mess up the working set. Given that swap usually is a lot less valuable and less scarce, letting the existing usage dissipate over time through the above gradual reclaim and as they're falted back in is likely the better behavior. Link: http://lkml.kernel.org/r/20180523185041.GR1718769@devbig577.frc2.facebook.com Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Roman Gushchin <guro@fb.com> Acked-by: Rik van Riel <riel@surriel.com> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Cc: Michal Hocko <mhocko@kernel.org> Cc: Shaohua Li <shli@fb.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2018-06-07 17:34:37 -07:00
..
ABI	media updates for v4.18-rc1	2018-06-07 12:34:37 -07:00
accelerators	ocxl: Document new OCXL IOCTLs	2018-06-03 20:40:33 +10:00
accounting
acpi	ACPI / CPPC: Document CPPC sysfs interface	2018-04-24 12:33:28 +02:00
admin-guide	mm: memcg: allow lowering memory.swap.max below the current usage	2018-06-07 17:34:37 -07:00
aoe
arm	Documentation: arm: clean up Marvell Berlin family info	2018-05-16 13:11:57 -06:00
arm64	ARM:	2018-04-09 11:42:31 -07:00
auxdisplay
backlight
block	There's been a fair amount of work in the docs tree this time around,	2018-06-04 12:34:27 -07:00
blockdev	zram: introduce zram memory tracking	2018-06-07 17:34:34 -07:00
bpf	bpf, doc: howto use/run the BPF selftests	2018-05-14 23:02:58 -07:00
bus-devices
cdrom
cgroup-v1	page cache: use xa_lock	2018-04-11 10:28:39 -07:00
cma
connector
console
core-api	Printk changes for 4.18	2018-06-06 16:04:55 -07:00
cpu-freq	cpufreq: Drop cpufreq_table_validate_and_show()	2018-04-10 08:40:45 +02:00
cpuidle	cpuidle: Add definition of residency to sysfs documentation	2018-04-09 13:44:37 +02:00
crypto	docs: */index.rst: Add newer documents to their respective index.rst	2018-05-08 09:57:35 -06:00
dev-tools	doc: dev-tools: kselftest.rst: update contributing new tests	2018-04-27 16:56:15 -06:00
device-mapper	dm thin: update Documentation to clarify when "read_only" is valid	2018-05-10 11:18:49 -04:00
devicetree	media updates for v4.18-rc1	2018-06-07 12:34:37 -07:00
doc-guide	MAINTAINERS & files: Canonize the e-mails I use at files	2018-05-04 06:21:06 -04:00
driver-api	Driver core changes for 4.18-rc1	2018-06-05 16:29:19 -07:00
driver-model
early-userspace
EDID
extcon
fault-injection	Documentation: nvme: Documentation for nvme fault injection	2018-03-26 08:53:43 -06:00
fb
features	mm: introduce ARCH_HAS_PTE_SPECIAL	2018-06-07 17:34:35 -07:00
filesystems	overlayfs fixes for 4.18	2018-06-07 08:53:50 -07:00
firmware_class
fmc
gpio	Documentation: gpio: Move drivers-on-gpio.txt to driver-api	2018-03-23 04:22:29 +01:00
gpu	Merge remote-tracking branch 'drm/drm-next' into drm-misc-next	2018-05-11 18:08:10 +02:00
hid
hwmon	hwmon: (ltc2990) support all measurement modes	2018-05-21 07:52:01 -07:00
i2c	i2c: ocores: update HDL sources URL	2018-05-29 20:14:32 +02:00
ia64
ide
iio
infiniband
input	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input	2018-04-05 13:21:57 -07:00
ioctl	Char/Misc driver patches for 4.18-rc1	2018-06-05 16:20:22 -07:00
isdn	Documentation/isdn: check and fix dead links ...	2018-03-26 12:31:13 -04:00
kbuild	Documentation: kconfig: document a new Kconfig macro language	2018-05-29 03:31:19 +09:00
kdump
kernel-hacking
laptops
leds
lightnvm
livepatch	livepatch: Allow to call a custom callback when freeing shadow variables	2018-04-17 13:42:48 +02:00
locking
m68k
maintainer
md
media	media: cec: improve cec status documentation	2018-05-25 15:34:50 -04:00
memory-devices
mic
mips
misc-devices	misc: IBM Virtual Management Channel Driver (VMC)	2018-05-14 16:35:42 +02:00
mmc
mtd
namespaces
netlabel
networking	netdev-FAQ: clarify DaveM's position for stable backports	2018-06-05 14:19:45 -04:00
nfc
nios2
nvdimm
nvmem
openrisc
parisc
PCI
pcmcia
perf
phy
platform
power	firmware: Fix firmware documentation for recent file renames	2018-04-23 13:03:26 +02:00
powerpc
pps
process	There's been a fair amount of work in the docs tree this time around,	2018-06-04 12:34:27 -07:00
pti
ptp	ptp: Fix documentation to match code.	2018-03-26 12:13:21 -04:00
rapidio
RCU	doc: Ensure whatisRCU.txt actually says what RCU is	2018-05-15 10:28:12 -07:00
s390
scheduler	sched/deadline/Documentation: Add overrun signal and GRUB-PA documentation	2018-05-14 09:12:27 +02:00
scsi	block: remove BLK_EH_HANDLED	2018-05-29 08:59:21 -06:00
security	docs: */index.rst: Add newer documents to their respective index.rst	2018-05-08 09:57:35 -06:00
serial
sh
sound	sound updates for 4.18	2018-06-06 09:08:38 -07:00
sparc
sphinx	MAINTAINERS & files: Canonize the e-mails I use at files	2018-05-04 06:21:06 -04:00
sphinx-static
spi
sysctl	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	2018-06-06 18:39:49 -07:00
target
thermal	thermal: Add cooling device's statistics in sysfs	2018-04-02 21:49:01 +08:00
timers
trace	One new feature was added to ftrace, which is the trace_marker now supports	2018-06-06 16:39:18 -07:00
translations	Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2018-06-04 16:40:11 -07:00
usb
userspace-api	audit/stable-4.18 PR 20180605	2018-06-06 16:34:00 -07:00
virtual	kvm: rename KVM_HINTS_DEDICATED to KVM_HINTS_REALTIME	2018-05-17 19:12:13 +02:00
vm	docs/vm: move ksm and transhuge from "user" to "internals" section.	2018-05-29 06:45:55 -06:00
w1
watchdog	watchdog: remove bfin_wdt driver	2018-03-26 15:57:04 +02:00
wimax
x86	Merge branch 'x86-cache-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2018-06-04 21:34:39 -07:00
xtensa
.gitignore
00-INDEX	docs: admin-guide: add cgroup-v2 documentation	2018-05-10 15:42:41 -06:00
atomic_bitops.txt
atomic_t.txt
bt8xxgpio.txt
btmrvl.txt
bus-virt-phys-mapping.txt
Changes
clearing-warn-once.txt
CodingStyle
conf.py
cpu-load.txt
cputopology.txt
crc32.txt
dcdbas.txt
debugging-modules.txt
debugging-via-ohci1394.txt
dell_rbu.txt	Documentation: remove stale firmware API reference	2018-05-14 16:44:41 +02:00
digsig.txt
DMA-API-HOWTO.txt
DMA-API.txt
DMA-attributes.txt
DMA-ISA-LPC.txt
docutils.conf
dontdiff
efi-stub.txt
eisa.txt
flexible-arrays.txt
futex-requeue-pi.txt
gcc-plugins.txt
highuid.txt
hw_random.txt
hwspinlock.txt
index.rst	docs/vm: add index.rst and link MM documentation to top level index	2018-04-16 14:18:15 -06:00
intel_txt.txt
Intel-IOMMU.txt
io_ordering.txt
io-mapping.txt
iostats.txt
IPMI.txt
IRQ-affinity.txt
IRQ-domain.txt
IRQ.txt
irqflags-tracing.txt
isa.txt
isapnp.txt
kernel-per-CPU-kthreads.txt
kobject.txt
kprobes.txt
kref.txt
ldm.txt
lockup-watchdogs.txt
logo.gif
logo.txt
lsm.txt
lzo.txt
mailbox.txt
Makefile
memory-barriers.txt	Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2018-06-04 16:40:11 -07:00
memory-hotplug.txt
men-chameleon-bus.txt
nommu-mmap.txt
ntb.txt
numastat.txt
padata.txt
parport-lowlevel.txt
percpu-rw-semaphore.txt
phy.txt
pi-futex.txt
pnp.txt
preempt-locking.txt
pwm.txt
rbtree.txt
remoteproc.txt
rfkill.txt
robust-futex-ABI.txt
robust-futexes.txt
rpmsg.txt
rtc.txt
SAK.txt
sgi-ioc4.txt
siphash.txt
SM501.txt
smsc_ece1099.txt
speculation.txt
static-keys.txt
SubmittingPatches
svga.txt
switchtec.txt
sync_file.txt
tee.txt
this_cpu_ops.txt
unaligned-memory-access.txt
vfio-mediated-device.txt
vfio.txt	vfio: fix documentation	2018-05-08 09:16:41 -06:00
video-output.txt
xillybus.txt
xz.txt
zorro.txt