Minchan Kim 213b53a48f zram: promote zram from staging ... (cherry pick from commit cd67e10ac6) Zram has lived in staging for a LONG LONG time and have been fixed/improved by many contributors so code is clean and stable now. Of course, there are lots of product using zram in real practice. The major TV companys have used zram as swap since two years ago and recently our production team released android smart phone with zram which is used as swap, too and recently Android Kitkat start to use zram for small memory smart phone. And there was a report Google released their ChromeOS with zram, too and cyanogenmod have been used zram long time ago. And I heard some disto have used zram block device for tmpfs. In addition, I saw many report from many other peoples. For example, Lubuntu start to use it. The benefit of zram is very clear. With my experience, one of the benefit was to remove jitter of video application with backgroud memory pressure. It would be effect of efficient memory usage by compression but more issue is whether swap is there or not in the system. Recent mobile platforms have used JAVA so there are many anonymous pages. But embedded system normally are reluctant to use eMMC or SDCard as swap because there is wear-leveling and latency issues so if we do not use swap, it means we can't reclaim anoymous pages and at last, we could encounter OOM kill. :( Although we have real storage as swap, it was a problem, too. Because it sometime ends up making system very unresponsible caused by slow swap storage performance. Quote from Luigi on Google "Since Chrome OS was mentioned: the main reason why we don't use swap to a disk (rotating or SSD) is because it doesn't degrade gracefully and leads to a bad interactive experience. Generally we prefer to manage RAM at a higher level, by transparently killing and restarting processes. But we noticed that zram is fast enough to be competitive with the latter, and it lets us make more efficient use of the available RAM. " and he announced. http://www.spinics.net/lists/linux-mm/msg57717.html Other uses case is to use zram for block device. Zram is block device so anyone can format the block device and mount on it so some guys on the internet start zram as /var/tmp. http://forums.gentoo.org/viewtopic-t-838198-start-0.html Let's promote zram and enhance/maintain it instead of removing. Signed-off-by: Minchan Kim <minchan@kernel.org> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Acked-by: Nitin Gupta <ngupta@vflare.org> Acked-by: Pekka Enberg <penberg@kernel.org> Cc: Bob Liu <bob.liu@oracle.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Hugh Dickins <hughd@google.com> Cc: Jens Axboe <axboe@kernel.dk> Cc: Luigi Semenzato <semenzato@google.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Rik van Riel <riel@redhat.com> Cc: Seth Jennings <sjenning@linux.vnet.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Bug: 24810447 Change-Id: Ie338290523af86fc4401a1560920de1b71100152		2018-01-01 21:26:45 +03:00
..
ABI	Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1	2017-12-27 17:13:15 +03:00
accounting
acpi	Update documentation for parameter *notrigger* in einj.txt	2012-03-30 03:30:19 -04:00
aoe	Documentation: remove references to /etc/modprobe.conf	2012-03-30 16:03:15 -07:00
arm	uio: msm_sharedmem: Add new device driver for sharedmemory access	2014-07-15 23:59:19 +00:00
auxdisplay
backlight	backlight: new backlight driver for LP855x devices	2012-03-23 16:58:33 -07:00
blackfin	doc: fix broken references	2011-09-27 18:08:04 +02:00
block	block: Add test-iosched scheduler	2013-02-27 18:13:18 -08:00
blockdev	zram: promote zram from staging	2018-01-01 21:26:45 +03:00
cdrom	doc: fix broken references	2011-09-27 18:08:04 +02:00
cgroups	Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1	2017-12-27 17:13:15 +03:00
connector
console
cpu-freq	cpufreq: interactive: add boost pulse interface	2012-05-03 17:41:51 -07:00
cpuidle	cpuidle: add a sysfs entry to disable specific C state for debug purpose.	2012-03-30 01:52:58 -04:00
cris
crypto	crypto: Add MSM crypto drivers	2013-02-25 11:29:28 -08:00
development-process	Documentation: Update stable address	2011-12-12 14:14:31 -08:00
device-mapper	dm: verity fix documentation	2012-07-16 09:04:25 -07:00
devicetree	Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1	2017-12-27 17:13:15 +03:00
DocBook	ALSA: Remove transfer_ack_{begin,end} callbacks from struct snd_pcm_runtime	2017-03-07 05:44:05 +00:00
driver-model	Merge remote-tracking branches 'regulator/topic/devm' and 'regulator/topic/stub' into regulator-next	2012-03-18 21:38:28 +00:00
dvb	Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1	2017-12-27 17:13:15 +03:00
early-userspace
EDID	drm: allow loading an EDID as firmware to override broken monitor	2012-03-20 10:09:28 +00:00
fault-injection	fault-injection: update documentation with the mmc module param	2011-10-26 16:32:13 -04:00
fb	Documentation: remove references to /etc/modprobe.conf	2012-03-30 16:03:15 -07:00
filesystems	BACKPORT: mm: /proc/pid/smaps:: show proportional swap share of the mapping	2017-12-27 22:48:40 +03:00
firmware_class	firmware loader: document firmware cache mechanism	2017-12-28 12:57:14 +03:00
frv	doc: fix broken references	2011-09-27 18:08:04 +02:00
hid	HID: uhid: add documentation	2013-03-04 12:45:09 -08:00
hwmon	hwmon: (coretemp) Add support for Atom CE4110/4150/4170	2014-04-14 06:44:31 -07:00
i2c	i2c-piix4: Add AMD CZ SMBus device ID	2014-06-07 16:02:14 -07:00
i2o	Documentation: Fix multiple typo in Documentation	2012-03-07 16:08:24 +01:00
ia64
ide	Documentation: remove references to /etc/modprobe.conf	2012-03-30 16:03:15 -07:00
infiniband
input	Documentation: input.txt: clarify mousedev 'cat' command syntax	2012-03-30 16:03:15 -07:00
ioctl	Merge branch 'for-next' of git://gitorious.org/kernel-hsi/kernel-hsi	2012-04-02 09:50:40 -07:00
isdn	Documentation: remove references to /etc/modprobe.conf	2012-03-30 16:03:15 -07:00
ja_JP	Documentation: Update stable address in Chinese and Japanese translations	2014-06-07 16:02:02 -07:00
kbuild	Documentation: mention scripts/diffconfig tool	2012-03-30 16:03:15 -07:00
kdump	[S390] Add s390x description to Documentation/kdump/kdump.txt	2011-12-27 11:27:13 +01:00
ko_KR	driver-core: documentation: fix up Greg's email address	2012-02-15 14:48:01 -08:00
laptops	Documentation: remove references to /etc/modprobe.conf	2012-03-30 16:03:15 -07:00
leds	drivers/leds/leds-lp5521.c: support led pattern data	2012-03-23 16:58:34 -07:00
m68k
make
mips
misc-devices
mmc	mmc: use percentage changed sectors as indication to check BKOPS need	2013-03-15 17:08:16 -07:00
mn10300
mtd	mtd: msm_qpic_nand: Initial driver for QPIC based NAND controller	2013-02-27 18:17:42 -08:00
namespaces
netlabel
networking	Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1	2017-12-27 17:13:15 +03:00
nfc
parisc
PCI	doc: fix broken references	2011-09-27 18:08:04 +02:00
pcmcia
power	Documentation: Point to correct header file	2013-02-25 11:36:56 -08:00
powerpc	Documentation/powerpc/mpc52xx.txt: Checkpatch cleanup	2012-03-18 23:59:34 +01:00
pps
prctl	Documentation: prctl/seccomp_filter	2014-10-31 19:46:17 -07:00
pti
ptp
rapidio	RapidIO: documentation update	2011-11-02 16:07:02 -07:00
RCU	rcu: Call out dangers of expedited RCU primitives	2012-02-21 09:06:08 -08:00
s390	Documentation: remove references to /etc/modprobe.conf	2012-03-30 16:03:15 -07:00
scheduler	sched: Remove sched_switch	2012-01-27 13:28:53 +01:00
scsi	SCSI updates on 20120331	2012-03-31 13:31:23 -07:00
security	KEYS: Add invalidation support	2016-10-29 23:12:12 +08:00
serial	Documentation: remove references to /etc/modprobe.conf	2012-03-30 16:03:15 -07:00
sh
sound	Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1	2017-12-27 17:13:15 +03:00
sparc
spi	spi: create a message queueing infrastructure	2012-03-07 19:19:48 -07:00
sysctl	Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1	2017-12-27 17:13:15 +03:00
target	Documentation: Fix typo in tcm_mod_builder.py	2012-02-10 09:52:18 +01:00
telephony
thermal	thermal: Rename generate_netlink_event	2012-01-23 03:15:25 -05:00
timers	time: Remove CONFIG_TIMER_STATS	2017-07-02 13:03:26 +03:00
trace	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2012-03-20 21:12:50 -07:00
usb	usb: misc: Add kickstart bridge driver	2013-02-27 18:19:01 -08:00
vDSO
video4linux	Documentation: remove references to /etc/modprobe.conf	2012-03-30 16:03:15 -07:00
virtual	Merge branch 'kvm-updates/3.4' of git://git.kernel.org/pub/scm/virt/kvm/kvm	2012-03-28 14:35:31 -07:00
vm	ksm: Provide support to use deferred timers for scanner thread	2016-10-29 23:12:17 +08:00
w1
watchdog	watchdog: Add support for WDIOC_GETTIMELEFT IOCTL in watchdog core	2012-03-27 20:15:37 +02:00
wimax
x86	x86-64, espfix: Don't leak bits 31:16 of %esp returning to 16-bit stack	2014-08-07 12:00:10 -07:00
zh_CN	Documentation: Update stable address in Chinese and Japanese translations	2014-06-07 16:02:02 -07:00
.gitignore
00-INDEX	crc32: move long comment about crc32 fundamentals to Documentation/	2012-03-23 16:58:37 -07:00
android.txt	[docs] android: Add android config documentation to boot framework.	2012-04-09 13:53:13 -07:00
applying-patches.txt
atomic_ops.txt	doc: Add load/store guarantees to Documentation/atomic-ops.txt	2011-12-11 10:31:58 -08:00
bad_memory.txt
basic_profiling.txt
binfmt_misc.txt
braille-console.txt
bt8xxgpio.txt
btmrvl.txt
BUG-HUNTING
bus-virt-phys-mapping.txt	doc: fix broken references	2011-09-27 18:08:04 +02:00
cachetlb.txt
Changes
circular-buffers.txt
clk.txt	Documentation: common clk API	2012-03-16 20:35:01 +00:00
coccinelle.txt	coccinelle.txt: update documentation to include M= option	2012-01-14 22:25:56 +01:00
CodingStyle	Documentation: CodingStyle: add inline assembly guidelines	2012-03-30 16:03:15 -07:00
cpu-hotplug.txt	documentation: remove references to cpu_*_map.	2012-03-29 15:38:31 +10:30
cpu-load.txt
cputopology.txt
crc32.txt	crc32: move long comment about crc32 fundamentals to Documentation/	2012-03-23 16:58:37 -07:00
csdio.txt	mmc: Char SDIO Device Driver	2013-02-25 11:29:22 -08:00
dcdbas.txt
debugging-modules.txt
debugging-via-ohci1394.txt
dell_rbu.txt
devices.txt	vhost-net: add module alias (v2.1)	2012-01-13 10:12:23 -08:00
digsig.txt	crypto: digital signature verification support	2011-11-09 12:10:37 +02:00
DMA-API-HOWTO.txt
DMA-API.txt	include/linux/dma-mapping.h: add dma_zalloc_coherent()	2011-11-02 16:07:02 -07:00
DMA-attributes.txt	common: DMA-mapping: Add strongly ordered memory attribute	2013-03-07 15:23:21 -08:00
dma-buf-sharing.txt	dma-buf: mmap support	2012-05-22 14:01:06 -07:00
DMA-ISA-LPC.txt
dmaengine.txt	Documentation: Fix multiple typo in Documentation	2012-03-07 16:08:24 +01:00
dontdiff	Documentation: remove 'mach' from dontdiff file	2012-03-30 16:03:15 -07:00
dynamic-debug-howto.txt	dynamic_debug: process multiple debug-queries on a line	2012-01-24 12:50:36 -08:00
edac.txt	EDAC: Correct scrub rate API	2012-03-19 12:03:58 +01:00
eisa.txt
email-clients.txt	Documentation: email-clients: Add better Thunderbird information	2011-08-13 18:34:03 -07:00
feature-removal-schedule.txt	Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media	2012-05-14 11:23:37 -07:00
flexible-arrays.txt
futex-requeue-pi.txt
gcov.txt
genlock.txt	base: genlock: allow synchronization with a single gralloc handle	2013-02-25 11:29:17 -08:00
gpio.txt	Documentation/gpio.txt: Explain expected pinctrl interaction	2012-03-12 11:27:07 -06:00
highuid.txt
HOWTO	docs: update HOWTO for 2.6.x -> 3.x versioning	2012-06-01 15:18:18 +08:00
hw_random.txt
hwspinlock.txt	hwspinlock/core: register a bank of hwspinlocks in a single API call	2011-09-21 19:45:34 +03:00
init.txt
initrd.txt
Intel-IOMMU.txt
intel_txt.txt
io-mapping.txt
io_ordering.txt
iostats.txt
IPMI.txt
IRQ-affinity.txt
IRQ-domain.txt	irq_domain: add documentation and MAINTAINERS entry.	2012-02-14 14:06:47 -07:00
IRQ.txt
irqflags-tracing.txt
isapnp.txt
java.txt
kernel-doc-nano-HOWTO.txt
kernel-docs.txt	doc: fix broken references	2011-09-27 18:08:04 +02:00
kernel-parameters.txt	Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1	2017-12-27 17:13:15 +03:00
kmemcheck.txt
kmemleak.txt	kmemleak: Handle percpu memory allocation	2011-12-02 16:12:42 +00:00
kobject.txt	driver-core: documentation: fix up Greg's email address	2012-02-15 14:48:01 -08:00
kprobes.txt
kref.txt
ldm.txt
local_ops.txt
lockdep-design.txt	lockdep: Update documentation for lock-class leak detection	2011-12-11 10:31:23 -08:00
lockstat.txt
lockup-watchdogs.txt	watchdog: Update documentation	2012-02-11 15:11:28 +01:00
logo.gif
logo.txt
lzo.txt	Documentation: lzo: document part of the encoding	2015-02-02 17:04:43 +08:00
magic-number.txt	drivers/net: fix up stale paths from driver reorg	2012-01-30 12:54:40 -05:00
Makefile	mm: move hugepage test examples to tools/testing/selftests/vm	2012-03-28 17:14:37 -07:00
ManagementStyle
mca.txt
md.txt	md: create externally visible flags for supporting hot-replace.	2011-12-23 10:17:51 +11:00
media-framework.txt	doc: fix broken references	2011-09-27 18:08:04 +02:00
memory-barriers.txt	doc: fix broken references	2011-09-27 18:08:04 +02:00
memory-hotplug.txt
memory.txt
mono.txt	Documentation: remove references to /etc/modprobe.conf	2012-03-30 16:03:15 -07:00
mutex-design.txt
nommu-mmap.txt
numastat.txt	Doc: Update numastat.txt	2012-02-28 16:05:06 +01:00
oops-tracing.txt	module,bug: Add TAINT_OOT_MODULE flag for modules not built in-tree	2011-11-07 07:54:42 +10:30
padata.txt
parport-lowlevel.txt
parport.txt	Documentation: remove references to /etc/modprobe.conf	2012-03-30 16:03:15 -07:00
pi-futex.txt
pinctrl.txt	pinctrl: fix example .get_group_pins implementation signature	2015-09-18 09:20:24 +08:00
pnp.txt
preempt-locking.txt
printk-formats.txt
prio_tree.txt
ramoops.txt	Documentation: add Ramoops usage description	2011-08-13 18:34:03 -07:00
rbtree.txt
remoteproc.txt	remoteproc: remove the single rpmsg vdev limitation	2012-03-06 19:14:12 +02:00
rfkill.txt	doc: fix broken references	2011-09-27 18:08:04 +02:00
robust-futex-ABI.txt
robust-futexes.txt
rpmsg.txt	rpmsg: add virtio-based remote processor messaging bus	2012-02-08 22:53:58 +02:00
rt-mutex-design.txt
rt-mutex.txt
rtc.txt
SAK.txt
SecurityBugs
serial-console.txt
sgi-ioc4.txt
sgi-visws.txt
SM501.txt
sparse.txt
spinlocks.txt
stable_api_nonsense.txt
stable_kernel_rules.txt	stable_kernel_rules: Add pointer to netdev-FAQ for network patches	2014-09-25 11:49:09 +08:00
static-keys.txt	static keys: Add docs better explaining the whole 'struct static_key' mechanism	2012-02-24 09:12:19 +01:00
SubmitChecklist
SubmittingDrivers	Documentation: SubmittingDrivers: fix Linus's git tree URL	2011-08-13 18:34:03 -07:00
SubmittingPatches	Documentation: fix spelling error in SubmittingPatches	2011-08-13 18:34:02 -07:00
svga.txt
sync.txt	sync: add Documentation/sync.txt	2013-03-15 17:13:08 -07:00
sysfs-rules.txt
sysrq.txt	Documentation: sysrq: Crutcher Dunnavant is unavailable	2012-03-30 16:03:15 -07:00
unaligned-memory-access.txt
unicode.txt
unshare.txt
VGA-softcursor.txt
vgaarbiter.txt	misc latin1 to utf8 conversions	2012-01-02 13:04:55 +01:00
video-output.txt
volatile-considered-harmful.txt
workqueue.txt
xz.txt
zorro.txt