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Vitaly Wool 9a001fc19c z3fold: the 3-fold allocator for compressed pages 
This patch introduces z3fold, a special purpose allocator for storing
compressed pages.  It is designed to store up to three compressed pages
per physical page.  It is a ZBUD derivative which allows for higher
compression ratio keeping the simplicity and determinism of its
predecessor.

This patch comes as a follow-up to the discussions at the Embedded Linux
Conference in San-Diego related to the talk [1].  The outcome of these
discussions was that it would be good to have a compressed page
allocator as stable and deterministic as zbud with with higher
compression ratio.

To keep the determinism and simplicity, z3fold, just like zbud, always
stores an integral number of compressed pages per page, but it can store
up to 3 pages unlike zbud which can store at most 2.  Therefore the
compression ratio goes to around 2.6x while zbud's one is around 1.7x.

The patch is based on the latest linux.git tree.

This version has been updated after testing on various simulators (e.g.
ARM Versatile Express, MIPS Malta, x86_64/Haswell) and basing on
comments from Dan Streetman [3].

[1] https://openiotelc2016.sched.org/event/6DAC/swapping-and-embedded-compression-relieves-the-pressure-vitaly-wool-softprise-consulting-ou
[2] https://lkml.org/lkml/2016/4/21/799
[3] https://lkml.org/lkml/2016/5/4/852

Link: http://lkml.kernel.org/r/20160509151753.ec3f9fda3c9898d31ff52a32@gmail.com
Signed-off-by: Vitaly Wool <vitalywool@gmail.com>
Cc: Seth Jennings <sjenning@redhat.com>
Cc: Dan Streetman <ddstreet@ieee.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-05-20 17:58:30 -07:00
..
ABI powerpc updates for 4.7 2016-05-20 10:12:41 -07:00
accounting taskstats: fix nl parsing in accounting/getdelays.c 2016-04-27 12:50:14 -04:00
acpi ACPI / tables: Convert initrd table override to table upgrade mechanism 2016-04-18 23:59:09 +02:00
aoe
arm Documentation: fix common spelling mistakes 2016-04-28 07:51:59 -06:00
arm64 IOMMU Updates for Linux v4.7 2016-05-19 17:07:04 -07:00
auxdisplay
backlight
blackfin
block The most interesting thing (IMO) this time around is some beginning 2016-05-19 18:07:25 -07:00
blockdev cpqarray: remove it from the kernel 2016-03-14 09:06:01 -06:00
bus-devices
cdrom
cgroup-v1 Documentation/memcg: update kmem limit doc as codes behavior 2016-05-14 10:12:45 -06:00
cma
connector samples: connector: from Documentation to samples directory 2016-04-28 07:47:35 -06:00
console
cpu-freq Documentation: cpufreq: intel_pstate: fix typo 2016-02-18 20:31:53 +01:00
cpuidle
cris
crypto crypto: doc - Use ahash 2016-02-06 15:33:11 +08:00
development-process
device-mapper dm stats: fix spelling mistake in Documentation 2016-05-05 15:25:54 -04:00
devicetree - New Drivers 2016-05-20 11:10:24 -07:00
dmaengine Merge branch 'topic/async' into for-linus 2016-01-06 15:17:47 +05:30
DocBook Merge branch 'akpm' (patches from Andrew) 2016-05-19 20:00:06 -07:00
driver-model - New Drivers 2016-05-20 11:10:24 -07:00
dvb [media] media: change email address 2016-01-25 12:01:08 -02:00
early-userspace
EDID
extcon
fault-injection net: Add support for CHANGEUPPER notifier error injection 2015-12-03 11:49:23 -05:00
fb Documentation: fb: fix spelling mistakes 2016-05-10 12:05:27 +03:00
features powerpc: Add HAVE_PERF_USER_STACK_DUMP support 2016-05-11 21:54:05 +10:00
filesystems The most interesting thing (IMO) this time around is some beginning 2016-05-19 18:07:25 -07:00
firmware_class Documentation: fix common spelling mistakes 2016-04-28 07:51:59 -06:00
fmc
fpga usage documentation for FPGA manager core 2015-10-07 18:07:20 +01:00
frv
gpio gpio: clarify open drain/source docs 2016-04-27 10:23:44 +02:00
hid
hwmon The most interesting thing (IMO) this time around is some beginning 2016-05-19 18:07:25 -07:00
i2c [media] rtl2832: change the i2c gate to be mux-locked 2016-05-04 22:40:02 +02:00
ia64
ide
iio iio: Documentation: Add IIO configfs documentation 2015-12-03 18:19:28 +00:00
infiniband Documentation: fix common spelling mistakes 2016-04-28 07:51:59 -06:00
input Input: clarify we want BTN_TOOL_<name> on proximity 2016-04-06 10:23:09 -07:00
ioctl gpio: uapi: use 0xB4 as ioctl() major 2016-03-10 16:02:52 +07:00
isdn isdn: i4l: move active-isdn drivers to staging 2016-03-05 15:00:38 -08:00
ja_JP Documentatio: HOWTO: remove regression postings info from translations 2016-04-16 10:49:08 -06:00
kbuild kbuild: document recursive dependency limitation / resolution 2015-10-08 15:36:16 +02:00
kdump ARM: kexec: fix crashkernel= handling 2016-05-03 11:13:45 +01:00
ko_KR Documentation: HOWTO: update git home URL in translations 2016-04-16 10:49:18 -06:00
laptops Documentation: laptops: fix spelling mistake 2016-04-28 07:21:48 -06:00
leds Documentation: leds: Add description of brightness setting API 2016-01-04 09:57:31 +01:00
livepatch Merge branches 'for-4.7/core', 'for-4.7/livepatching-doc' and 'for-4.7/livepatching-ppc64' into for-linus 2016-05-17 12:06:35 +02:00
locking locking/Documentation/lockdep: Fix spelling mistakes 2016-04-28 10:40:57 +02:00
m68k
memory-devices
metag
mic Char/Misc patches for 4.6-rc1 2016-03-17 13:47:50 -07:00
mips
misc-devices Merge char-misc-next into staging-next 2016-02-22 14:46:24 -08:00
mmc Documentation: mmc: Add the introduction for mmc-utils 2016-03-31 00:54:22 -06:00
mn10300
mtd Documentation: mtd: improve nand_ecc.txt for readability and correctness 2015-11-17 17:05:14 -08:00
namespaces
netlabel
networking The most interesting thing (IMO) this time around is some beginning 2016-05-19 18:07:25 -07:00
nfc
nios2
nvdimm libnvdimm: documentation clarifications 2015-11-12 09:55:23 -08:00
nvmem
parisc
PCI
pcmcia pcmcia: Fix typo in locking documentation 2015-08-07 14:34:58 +02:00
phy
platform
power PM / runtime: Document steps for device removal 2016-04-05 03:46:59 +02:00
powerpc powerpc/eeh: rename EEH from "extended" to "enhanced" error handling 2016-04-11 20:30:42 +10:00
pps Documentation: pps: fix spelling mistake 2016-04-28 07:23:59 -06:00
prctl Documentation: Fix int/unsigned int comparison 2016-02-17 14:09:43 -07:00
pti
ptp Another relatively boring cycle for the docs tree: typo fixes, translation 2016-03-17 12:09:35 -07:00
rapidio rapidio: add mport char device driver 2016-03-22 15:36:02 -07:00
RCU The most interesting thing (IMO) this time around is some beginning 2016-05-19 18:07:25 -07:00
s390 s390/zcore: remove /sys/kernel/debug/zcore/mem 2015-11-27 09:24:12 +01:00
scheduler
scsi The most interesting thing (IMO) this time around is some beginning 2016-05-19 18:07:25 -07:00
security The most interesting thing (IMO) this time around is some beginning 2016-05-19 18:07:25 -07:00
serial serial: doc: Use port->state instead of info 2016-05-14 10:18:25 -06:00
sh
sound ALSA: compress: fix some typo 2016-05-08 11:27:44 +02:00
spi spi: tools: move spidev_test metadata 2015-11-30 12:14:12 +00:00
sysctl mm: /proc/sys/vm/stat_refresh to force vmstat update 2016-05-19 19:12:14 -07:00
target target/user: Report capability of handling out-of-order completions to userspace 2016-03-10 21:49:09 -08:00
thermal thermal: doc: Add details of devm_thermal_zone_of_sensor_{register,unregister} 2016-03-09 10:51:41 -08:00
timers Documentation: fix common spelling mistakes 2016-04-28 07:51:59 -06:00
tpm
trace This includes two new updates for the ftrace infrastructure. 2016-05-18 18:55:19 -07:00
usb doc: usb: Fix typo in gadget_multi documentation 2016-04-15 15:45:19 -06:00
vDSO
video4linux The most interesting thing (IMO) this time around is some beginning 2016-05-19 18:07:25 -07:00
virtual kvm: introduce KVM_MAX_VCPU_ID 2016-05-11 22:37:54 +02:00
vm z3fold: the 3-fold allocator for compressed pages 2016-05-20 17:58:30 -07:00
w1 w1: masters: omap_hdq: add support for 1-wire mode 2015-10-05 04:47:09 +01:00
watchdog Merge git://www.linux-watchdog.org/linux-watchdog 2016-03-19 19:35:51 -07:00
wimax
x86 The most interesting thing (IMO) this time around is some beginning 2016-05-19 18:07:25 -07:00
xtensa
zh_CN Documentation:Update Documentation/zh_CN/arm64/booting.txt 2016-04-28 07:15:36 -06:00
00-INDEX
adding-syscalls.txt documentation: trivial typo: adding-syscalls.txt: s/statat/fstatat/ 2016-04-18 11:31:49 -06:00
applying-patches.txt
assoc_array.txt
atomic_ops.txt locking/atomics, cmpxchg: Privatize the inclusion of asm/cmpxchg.h 2015-09-13 10:35:46 +02:00
bad_memory.txt
basic_profiling.txt
bcache.txt
binfmt_misc.txt
braille-console.txt
bt8xxgpio.txt
btmrvl.txt
BUG-HUNTING
bus-virt-phys-mapping.txt
cachetlb.txt
cgroup-v2.txt Merge branch 'for-4.6-ns' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup 2016-03-21 10:05:13 -07:00
Changes There is a nice new document from Neil on how pathname lookups work and 2015-11-05 15:59:24 -08:00
circular-buffers.txt
clk.txt
coccinelle.txt
CodeOfConflict
CodingStyle Documentation/CodingStyle: add space before parenthesis in example macro 2016-01-25 12:36:28 -07:00
cpu-hotplug.txt Documentation: cpu-hotplug: Fix sysfs mount instructions 2015-12-10 11:35:30 -07:00
cpu-load.txt
cputopology.txt
crc32.txt
dcdbas.txt
debugging-modules.txt
debugging-via-ohci1394.txt
dell_rbu.txt
devices.txt
digsig.txt
DMA-API-HOWTO.txt dma-mapping: always provide the dma_map_ops based implementation 2016-01-20 17:09:18 -08:00
DMA-API.txt DMA-API: fix confusing sentence in Documentation/DMA-API.txt 2016-01-11 18:29:00 -07:00
DMA-attributes.txt ARM: 8506/1: common: DMA-mapping: add DMA_ATTR_ALLOC_SINGLE_PAGES attribute 2016-02-11 15:33:38 +00:00
dma-buf-sharing.txt dma-buf: Update docs for SYNC ioctl 2016-03-21 09:26:45 +01:00
DMA-ISA-LPC.txt
dontdiff Documentation: dontdiff: remove media from dontdiff 2015-11-11 10:08:07 -07:00
dynamic-debug-howto.txt
edac.txt EDAC: Remove references to bluesmoke.sourceforge.net 2015-11-26 14:46:06 +01:00
efi-stub.txt doc: efi-stub.txt: Fix arm64 paths 2015-12-14 15:24:03 +00:00
eisa.txt
email-clients.txt A few more documentation patches that wandered in and have no reason to 2015-11-13 09:19:05 -08:00
flexible-arrays.txt
futex-requeue-pi.txt
gcov.txt
gdb-kernel-debugging.txt
highuid.txt
HOWTO Documentation: Howto: Fixed subtitles style 2016-03-09 15:30:03 -07:00
hsi.txt
hw_random.txt hwrng: doc - Fix device node name reference /dev/hw_random => /dev/hwrng 2015-09-21 22:00:41 +08:00
hwspinlock.txt
init.txt
initrd.txt
intel_txt.txt
Intel-IOMMU.txt iommu/vt-d: Fix link to Intel IOMMU Specification 2016-01-29 12:32:12 +01:00
io_ordering.txt
io-mapping.txt
iostats.txt
IPMI.txt ipmi watchdog : add panic_wdt_timeout parameter 2015-11-16 06:28:43 -06:00
IRQ-affinity.txt
IRQ-domain.txt Documentation/IRQ-domain.txt: Document irq_domain_create_{linear, tree} 2016-03-31 00:32:59 -06:00
IRQ.txt
irqflags-tracing.txt
isapnp.txt
java.txt
kasan.txt mm, kasan: SLAB support 2016-03-25 16:37:42 -07:00
kcov.txt kernel: add kcov code coverage 2016-03-22 15:36:02 -07:00
kernel-doc-nano-HOWTO.txt
kernel-docs.txt Documentation: update Michael K. Johnson's work 2016-04-15 15:37:25 -06:00
kernel-parameters.txt Merge branch 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm 2016-05-20 10:01:38 -07:00
kernel-per-CPU-kthreads.txt irq_poll: make blk-iopoll available outside the block layer 2015-12-11 11:52:24 -08:00
kmemcheck.txt
kmemleak.txt
kobject.txt
kprobes.txt
kref.txt
kselftest.txt Documentation: kselftest: Remove duplicate word 2016-03-09 15:33:38 -07:00
ldm.txt
local_ops.txt
lockup-watchdogs.txt kernel/watchdog.c: add sysctl knob hardlockup_panic 2015-11-05 19:34:48 -08:00
logo.gif
logo.txt
lzo.txt Documentation: lzo: fix spelling mistakes 2016-04-28 07:23:11 -06:00
magic-number.txt
mailbox.txt Documentation: minor typo fix in mailbox.txt 2015-08-13 18:03:18 -06:00
Makefile [media] samples: v4l: from Documentation to samples directory 2016-05-09 18:34:37 -03:00
ManagementStyle
md-cluster.txt md-cluster: change array_sectors and update size are not supported 2016-05-04 12:39:35 -07:00
md.txt
memory-barriers.txt locking/Documentation: Clarify that ACQUIRE applies to loads, RELEASE applies to stores 2016-04-28 10:57:51 +02:00
memory-hotplug.txt memory_hotplug: introduce CONFIG_MEMORY_HOTPLUG_DEFAULT_ONLINE 2016-05-19 19:12:14 -07:00
men-chameleon-bus.txt
module-signing.txt modsign: Fix documentation on module signing enforcement parameter. 2016-03-12 01:48:11 -07:00
mono.txt
nommu-mmap.txt
ntb.txt
numastat.txt
oops-tracing.txt
padata.txt
parport-lowlevel.txt
parport.txt
percpu-rw-semaphore.txt
phy.txt phy: core: Allow children node to be overridden 2016-04-29 16:39:39 +02:00
pi-futex.txt
pinctrl.txt
pnp.txt
preempt-locking.txt
printk-formats.txt mm, printk: introduce new format string for flags 2016-03-15 16:55:16 -07:00
pwm.txt
ramoops.txt
rbtree.txt documentation: fix small typo in rbtree.txt 2015-09-13 14:38:50 -06:00
remoteproc.txt
rfkill.txt rfkill: Add documentation about LED triggers 2016-02-24 09:13:12 +01:00
robust-futex-ABI.txt
robust-futexes.txt Documentation: robust-futexes: fix spelling mistakes 2016-04-28 07:26:41 -06:00
rpmsg.txt rpmsg: use module_rpmsg_driver in existing drivers and examples 2016-05-06 11:09:01 -07:00
rtc.txt rtc: implement a sysfs interface for clock offset 2016-03-14 17:08:16 +01:00
SAK.txt
SecurityBugs
serial-console.txt
sgi-ioc4.txt
SM501.txt
smsc_ece1099.txt
sparse.txt
stable_api_nonsense.txt
stable_kernel_rules.txt stable_kernel_rules.txt: Remove extra space after Cc: 2015-11-20 16:54:57 -07:00
static-keys.txt locking/static_keys: Fix up the static keys documentation 2015-09-15 07:12:06 +02:00
SubmitChecklist
SubmittingDrivers
SubmittingPatches SubmittingPatches: fix spelling of "git send-email" 2016-01-25 12:30:18 -07:00
svga.txt
sysfs-rules.txt
sysrq.txt Doc: correct the location of sysrq.c 2016-04-28 08:02:36 -06:00
this_cpu_ops.txt
ubsan.txt UBSAN: run-time undefined behavior sanity checker 2016-01-20 17:09:18 -08:00
unaligned-memory-access.txt
unicode.txt
unshare.txt
vfio.txt
VGA-softcursor.txt
vgaarbiter.txt
video-output.txt
vme_api.txt
volatile-considered-harmful.txt
workqueue.txt
xillybus.txt Documentation: xillybus: fix spelling mistake 2016-04-28 07:44:54 -06:00
xz.txt
zorro.txt