Vitaly Wool 45190f01dd mm/zswap.c: add allocation hysteresis if pool limit is hit ... zswap will always try to shrink pool when zswap is full. If there is a high pressure on zswap it will result in flipping pages in and out zswap pool without any real benefit, and the overall system performance will drop. The previous discussion on this subject [1] ended up with a suggestion to implement a sort of hysteresis to refuse taking pages into zswap pool until it has sufficient space if the limit has been hit. This is my take on this. Hysteresis is controlled with a sysfs-configurable parameter (namely, /sys/kernel/debug/zswap/accept_threhsold_percent). It specifies the threshold at which zswap would start accepting pages again after it became full. Setting this parameter to 100 disables the hysteresis and sets the zswap behavior to pre-hysteresis state. [1] https://lkml.org/lkml/2019/11/8/949 Link: http://lkml.kernel.org/r/20200108200118.15563-1-vitaly.wool@konsulko.com Signed-off-by: Vitaly Wool <vitaly.wool@konsulko.com> Cc: Dan Streetman <ddstreet@ieee.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2020-01-31 10:30:39 -08:00
..
ABI	Staging/IIO patches for 5.6-rc1	2020-01-29 10:15:11 -08:00
accounting
admin-guide	- Fix DM core's potential for q->make_request_fn NULL pointer in the	2020-01-29 18:08:49 -08:00
arm
arm64	Merge branch 'for-next/rng' into for-next/core	2020-01-22 11:38:53 +00:00
block	docs: block/biovecs: update the location of bio.c	2020-01-10 10:23:15 -07:00
bpf	bpf: Add s390 testing documentation	2019-10-30 16:25:31 +01:00
cdrom
core-api	mm, tree-wide: rename put_user_page*() to unpin_user_page*()	2020-01-31 10:30:38 -08:00
cpu-freq
crypto	crypto: algapi - make unregistration functions return void	2019-12-20 14:58:35 +08:00
dev-tools	kunit: update documentation to describe module-based build	2020-01-09 16:44:10 -07:00
devicetree	Char/Misc driver changes for 5.6-rc1	2020-01-29 10:35:54 -08:00
doc-guide	Add a maintainer entry profile for documentation	2020-01-24 09:48:39 -07:00
driver-api	Char/Misc driver changes for 5.6-rc1	2020-01-29 10:35:54 -08:00
EDID
fault-injection
fb
features	riscv: gcov: enable gcov for RISC-V	2020-01-03 00:47:02 -08:00
filesystems	It has been a relatively quiet cycle for documentation, but there's still a	2020-01-29 15:27:31 -08:00
firmware_class
firmware-guide	docs: firmware-guide: ACPI: Replace dma_request_slave_channel() with dma_request_chan()	2019-12-19 22:58:12 +01:00
fpga	Documentation: fpga: dfl: add descriptions for thermal/power management interfaces	2019-10-16 19:18:26 -07:00
gpu	drm/amdgpu: Improve RAS documentation (v2)	2019-11-06 16:27:48 -05:00
hid
hwmon	hwmon: (adm1177) Add ADM1177 Hot Swap Controller and Digital Power Monitor driver	2020-01-23 13:15:11 -08:00
i2c	Here's the main documentation changes for 5.5:	2019-12-02 11:51:02 -08:00
ia64
ide
iio
infiniband
input
isdn	isdn: capi: dead code removal	2019-12-11 09:12:38 +01:00
kbuild	kbuild: clarify the difference between obj-y and obj-m w.r.t. descending	2019-12-22 00:25:35 +09:00
kernel-hacking	Documentation: kernel-hacking: hacking.rst: Change reference to document namespaces.rst to symbol-namespaces.rst	2019-12-19 09:36:23 -07:00
leds
livepatch	livepatch: Documentation of the new API for tracking system state changes	2019-11-01 13:08:24 +01:00
locking	doc:locking: fix locktorture parameter description	2019-12-19 11:04:29 -07:00
m68k
maintainer	Add a maintainer entry profile for documentation	2020-01-24 09:48:39 -07:00
media	doc: fix typo of snapshot in documentation	2020-01-11 14:30:24 -08:00
mic
mips
misc-devices	Documentation: fix Sphinx warning in xilinx_sdfec.rst	2019-12-19 09:26:25 -07:00
netlabel
networking	Documentation: net: octeontx2: Add RVU HW and drivers overview	2020-01-27 14:33:40 +01:00
nios2
nvdimm	docs: nvdimm: use ReST notation for subsection	2020-01-24 09:54:42 -07:00
openrisc
parisc
PCI
pcmcia
power	pci-v5.5-changes	2019-12-03 13:58:22 -08:00
powerpc	powerpc/fsl_booke/32: Document KASLR implementation	2019-11-13 19:27:58 +11:00
process	It has been a relatively quiet cycle for documentation, but there's still a	2020-01-29 15:27:31 -08:00
RCU	Merge branches 'doc.2019.12.10a', 'exp.2019.12.09a', 'fixes.2020.01.24a', 'kfree_rcu.2020.01.24a', 'list.2020.01.10a', 'preempt.2020.01.24a' and 'torture.2019.12.09a' into HEAD	2020-01-24 10:37:27 -08:00
riscv	It has been a relatively quiet cycle for documentation, but there's still a	2020-01-29 15:27:31 -08:00
s390
scheduler	Documentation/scheduler: fix links in sched-stats	2019-10-29 04:35:41 -06:00
scsi	scsi: smartpqi: Update attribute name to driver_version	2019-12-09 19:17:36 -05:00
security	Documentation: security: core.rst: fix warnings	2019-11-22 10:01:47 -07:00
sh
sound	sound updates for 5.6-rc1	2020-01-28 16:26:57 -08:00
sparc
sphinx	docs: Keep up with the location of NoUri	2020-01-24 09:47:05 -07:00
sphinx-static
spi
target
timers
trace	docs: ftrace: Fix small notation mistake	2020-01-10 10:52:47 -07:00
translations	docs/zh_CN: translate kernel enforcement statement	2019-12-30 12:00:46 -07:00
usb	docs: usb: remove some broken references	2020-01-28 13:41:22 -07:00
userspace-api	staging: remove isdn capi drivers	2019-12-11 09:11:29 +01:00
virt	KVM: Add support for secure guests under the Protected Execution	2019-11-29 19:20:08 +01:00
virtual
vm	mm/zswap.c: add allocation hysteresis if pool limit is hit	2020-01-31 10:30:39 -08:00
w1	docs: w1: Fix a typo in omap-hdq.rst	2019-12-30 11:58:02 -07:00
watchdog
x86	It has been a relatively quiet cycle for documentation, but there's still a	2020-01-29 15:27:31 -08:00
xtensa
.gitignore
asm-annotations.rst	Documentation: Call out example SYM_FUNC_* usage as x86-specific	2020-01-16 12:53:16 -07:00
atomic_bitops.txt
atomic_t.txt
bus-virt-phys-mapping.txt
Changes
CodingStyle
conf.py
COPYING-logo
crc32.txt
debugging-modules.txt
debugging-via-ohci1394.txt
digsig.txt
DMA-API-HOWTO.txt
DMA-API.txt
DMA-attributes.txt	dma-mapping: remove the DMA_ATTR_WRITE_BARRIER flag	2019-11-14 12:01:54 -04:00
DMA-ISA-LPC.txt
docutils.conf
dontdiff	modpost: dump missing namespaces into a single modules.nsdeps file	2019-11-11 20:10:01 +09:00
futex-requeue-pi.txt
hwspinlock.txt
index.rst	Here's the main documentation changes for 5.5:	2019-12-02 11:51:02 -08:00
io_ordering.txt
io-mapping.txt
IPMI.txt
IRQ-affinity.txt
IRQ-domain.txt
IRQ.txt
irqflags-tracing.txt
Kconfig
kobject.txt
kprobes.txt
kref.txt
logo.gif
lzo.txt
mailbox.txt
Makefile	Kbuild updates for v5.5	2019-12-02 17:35:04 -08:00
memory-barriers.txt	docs/memory-barriers.txt: Remove remaining references to mmiowb()	2019-11-22 10:00:46 -07:00
nommu-mmap.txt
percpu-rw-semaphore.txt
pi-futex.txt
preempt-locking.txt
rbtree.txt
remoteproc.txt
robust-futex-ABI.txt
robust-futexes.txt
rpmsg.txt
speculation.txt
static-keys.txt
SubmittingPatches
tee.txt	Documentation: tee: add AMD-TEE driver details	2020-01-04 13:49:51 +08:00
this_cpu_ops.txt
unaligned-memory-access.txt
xz.txt