Minchan Kim
cd67e10ac6
zram: promote zram from staging ...
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>
2014-01-30 16:56:55 -08:00
Documentation: fix multiple typo occurences s/KenelVersion/KernelVersion/
2014-01-29 16:22:40 -08:00
Documentation/accounting/getdelays.c: avoid strncpy in accounting tool
2013-07-03 16:08:06 -07:00
ACPI and power management updates for 3.14-rc1
2014-01-24 15:51:02 -08:00
aoe: remove do-nothing NAME="%k" term from example udev rules
2013-09-11 15:59:28 -07:00
ARM: SoC platform changes for 3.14
2014-01-23 18:40:49 -08:00
arm64: Use 42-bit address space with 64K pages
2013-11-05 17:23:52 +00:00
backlight: lp855x_bl: support new LP8555 device
2013-11-13 12:09:14 +09:00
Linux 3.13-rc6
2013-12-31 09:51:02 -07:00
zram: promote zram from staging
2014-01-30 16:56:55 -08:00
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next
2014-01-25 11:17:34 -08:00
connector - documentation: simplify netlink message length assignment
2013-10-02 16:03:51 -04:00
TTY:console: update document console.txt
2013-05-21 10:21:57 -07:00
Documentation: cpufreq / boost: Update BOOST documentation
2014-01-17 02:00:45 +01:00
cpuidle: remove cpuidle_unregister_governor()
2013-10-30 01:21:24 +01:00
drivers/dma: remove unused support for MEMSET operations
2013-07-03 16:07:42 -07:00
Documentation: development-process: Update -mm and -next URLs
2013-07-25 12:37:24 +02:00
dm cache: add policy name to status output
2014-01-16 13:44:11 -05:00
Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux
2014-01-29 20:49:12 -08:00
Merge branch 'master' into for-next
2013-12-19 15:08:32 +01:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
2014-01-22 21:21:55 -08:00
[media] get_dvb_firmware: Fix the location of firmware for Terratec HTC
2013-01-01 11:18:26 -02:00
Documentation: remove reference to 2.7 kernel in early-userspace
2013-08-20 12:47:28 +02:00
drm: Add 1600x1200 (UXGA) screen resolution to the built-in EDIDs
2013-04-12 14:06:16 +10:00
extcon: fix switch class porting guide (Documentation)
2014-01-07 11:54:28 +09:00
Documentation/fb/viafb.modes fix a typo
2013-08-20 12:41:11 +02:00
Merge branch 'for-3.14' of git://linux-nfs.org/~bfields/linux
2014-01-30 10:18:43 -08:00
doc: Fix typo "is is" in Documentations
2013-08-27 10:50:52 +02:00
gpiolib: return -ENOENT if no GPIO mapping exists
2013-12-12 19:33:59 +01:00
HID: uhid: use generic hidinput_input_event()
2013-07-31 10:33:05 +02:00
Update Jean Delvare's e-mail address
2014-01-29 20:40:08 +01:00
Merge branch 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux
2014-01-29 19:56:20 -08:00
Fix example error_injection_tool
2013-04-02 09:39:55 -07:00
Input: fix typos in Documentation/input/gamepad.txt
2013-12-18 08:47:43 -08:00
s390/hypfs: add interface for diagnose 0x304
2014-01-24 09:40:59 +01:00
Documentation: ja_JP: Update broken link to tpp
2013-12-10 23:09:08 -08:00
Documentation/kbuild/kconfig.txt: 'make listnewconfig' replaces: yes "" | make oldconfig
2013-10-08 23:51:50 +02:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
2013-07-04 11:40:58 -07:00
Documentation: HOWTO: Updates on subsystem trees, patchwork, -next (vs. -mm) in ko_KR
2014-01-08 15:32:51 -08:00
Documentation: Fix size parameter for snprintf
2014-01-02 10:47:33 +01:00
leds: lp5523: Support LED MUX configuration on running a pattern
2014-01-27 17:28:48 -08:00
block: remove refs to XD disks from documentation
2013-05-17 15:17:12 +02:00
doc: fix misspellings with 'codespell' tool
2013-05-28 12:02:12 +02:00
misc: mic: Fix endianness issues.
2013-11-27 11:03:38 -08:00
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: core: Add in support to expose PRV for v4 MMCs
2013-03-22 12:10:42 -04:00
mtd: nand: pxa3xx: Add documentation about the controller
2014-01-03 11:22:09 -08:00
userns: Recommend use of memory control groups.
2013-01-26 22:20:06 -08:00
net: Document promote_secondaries
2014-01-27 20:39:21 -08:00
NFC: Update pn544 documentation
2013-01-10 01:27:46 +01:00
parisc: document the shadow registers
2013-07-09 22:09:19 +02:00
Merge branch 'pci/msi' into next
2014-01-07 17:34:39 -07:00
Documentation/: update FireWire debugging documentation
2014-01-12 18:54:38 +01:00
powerpc: Update the 00-Index in Documentation/powerpc
2013-08-27 14:44:27 +10:00
USB: serial: invoke dcd_change ldisc's handler.
2013-09-26 09:45:40 -07:00
ptp: add the PTP_SYS_OFFSET ioctl to the testptp program
2013-09-23 16:46:17 -04:00
doc: Fix typo in doucmentations
2013-07-25 12:34:15 +02:00
Merge branches 'doc.2013.12.03a', 'fixes.2013.12.12a', 'rcutorture.2013.12.03a' and 'sparse.2013.12.12a' into HEAD
2013-12-12 12:35:38 -08:00
qeth: bridgeport support - address notifications
2014-01-15 14:48:01 -08:00
H8/300 has been dead for several years, the kernel for it has
2013-11-12 14:13:14 +09:00
Main batch of InfiniBand/RDMA changes for 3.14:
2014-01-24 17:18:32 -08:00
ima: update IMA-templates.txt documentation
2014-01-03 07:42:59 -05:00
serial: core: delete .set_wake() callback
2013-10-16 13:16:19 -07:00
ASoC: docs: Update the Overview document
2014-01-07 17:56:32 +00:00
spi: Correction to typos in Documentation/spi/spi-summary
2013-12-09 17:22:19 +00:00
mm: document improved handling of swappiness==0
2014-01-29 16:22:39 -08:00
target: Remove TF_CIT_TMPL macro
2013-10-16 13:35:02 -07:00
thermal: thermal_core: allow binding with limits on bind_params
2013-09-03 09:10:24 -04:00
doc: add missing files to timers/00-INDEX
2013-10-27 21:55:50 +00:00
drivers/tpm: add xen tpmfront interface
2013-08-09 10:57:06 -04:00
Documentation/trace/postprocess/trace-vmscan-postprocess.pl: fix the traceevent regex
2014-01-23 16:36:52 -08:00
doc: Fix typo in USB Gadget Documentation
2014-01-10 15:33:54 +01:00
[media] V4L: Add support for integer menu controls with standard menu items
2013-08-18 07:12:59 -03:00
Merge tag 'kvm-arm-for-3.14' of git://git.linaro.org/people/christoffer.dall/linux-kvm-arm into kvm-queue
2014-01-15 12:14:29 +01:00
mm: documentation: remove hopelessly out-of-date locking doc
2014-01-23 16:36:50 -08:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
2013-07-04 11:40:58 -07:00
watchdog: delete mpcore_wdt driver
2013-07-11 21:47:58 +02:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
2014-01-22 21:21:55 -08:00
xtensa: remap io area defined in device tree
2014-01-15 00:25:14 +04:00
Documentation: zh_CN: Update broken link to tpp
2013-12-10 23:09:08 -08:00
doc: fix a typo in Documentation/00-INDEX
2013-08-27 10:53:07 +02:00
KEYS: Fix multiple key add into associative array
2013-12-02 11:24:18 +00:00
Documentation: Memory barrier semantics of atomic_xchg()
2013-01-08 14:14:55 -08:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
2013-07-04 11:40:58 -07:00
Documentation: fix typo and update version in cachetlb.txt
2013-08-20 12:46:52 +02:00
remove obsolete references to powertweak
2013-11-27 20:34:32 -08:00
documentation: Update circular buffer for load-acquire/store-release
2013-12-03 10:08:57 -08:00
clk: Add set_rate_and_parent() op
2014-01-16 12:00:57 -08:00
Coccinelle: Update information about the minimal version required
2013-07-03 22:58:20 +02:00
Documentation/CodingStyle: allow multiple return statements per function
2013-07-03 16:08:01 -07:00
Documentation/cpu-hotplug.txt: fix a typo in example code
2014-01-23 16:37:01 -08:00
doc: Documentation/cputopology.txt fix typo
2013-09-04 12:59:47 +02:00
firewire: Enable remote DMA above 4 GB
2014-01-20 01:11:13 +01:00
misc: Reserve minor for VFIO
2013-12-19 10:17:11 -07:00
DMA-API: provide a helper to set both DMA and coherent DMA masks
2013-09-17 15:32:37 +01:00
DMA-API: provide a helper to set both DMA and coherent DMA masks
2013-09-17 15:32:37 +01:00
doc: Documentation/DMA-attributes.txt fix typo
2013-10-14 15:50:53 +02:00
dma-buf: Expose buffer size to userspace (v2)
2013-09-10 11:36:45 +05:30
dmatest: add a 'wait' parameter
2013-11-14 11:04:40 -08:00
dynamic-debug-howto.txt: update since new wildcard support
2014-01-23 16:36:55 -08:00
doc: Fix trivial spelling mistake in efi-stub.txt
2013-12-19 15:09:14 +01:00
doc: fix some typos
2013-12-02 14:48:28 +01:00
gcov: compile specific gcov implementation based on gcc version
2013-11-13 12:09:34 +09:00
Documentation: HOWTO: Update broken links to tpp
2013-12-10 23:09:08 -08:00
hwrng: Fix a wrong comment in Documentation/hw_random.txt
2013-03-10 18:16:36 +08:00
doc: documentation/hwspinlock.txt fix typo
2013-08-27 10:46:02 +02:00
Documentation: remove depends on CONFIG_EXPERIMENTAL
2013-01-11 11:38:03 -08:00
doc: fix some typos
2013-12-02 14:48:28 +01:00
iostats.txt: add easy-to-find description for field 6
2013-04-29 15:18:50 +02:00
ipmi: add options to disable openfirmware and PCI scanning
2013-02-27 19:10:21 -08:00
doc: fix a typo about irq affinity
2013-08-20 12:59:18 +02:00
doc: fix some typos
2013-12-02 14:48:28 +01:00
kernel-doc: Update references to SGML to refs to XML instead.
2013-05-28 12:02:11 +02:00
Bug-fixes:
2014-01-27 08:17:09 -08:00
kthread: Add pointer to vmstat-avoidance patch
2013-09-25 06:49:46 -07:00
Documentation/kmemcheck: update kmemcheck documentation
2013-08-27 10:47:05 +02:00
kobject: remove kset from sysfs immediately in kset_unregister()
2013-12-07 21:20:11 -08:00
lockstat: Report avg wait and hold times
2013-10-09 08:19:08 +02:00
wanrouter: completely decouple obsolete code from kernel.
2013-01-31 19:20:33 -05:00
doc: fix some typos in documentations
2013-12-02 14:45:19 +01:00
Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media
2013-07-13 12:09:57 -07:00
locking/doc: Rename LOCK/UNLOCK to ACQUIRE/RELEASE
2014-01-12 10:37:13 +01:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
2013-09-06 09:36:28 -07:00
Add Documentation/module-signing.txt file
2013-12-13 15:59:11 +00:00
locking/doc: Update references to kernel/mutex.c
2013-11-11 12:41:33 +01:00
drivers: phy: add generic PHY framework
2013-09-27 17:35:41 -07:00
pinctrl: Fix some typos and grammar issues in the documentation
2014-01-15 13:59:50 +01:00
vsprintf: add %pad extension for dma_addr_t use
2014-01-23 16:36:56 -08:00
Documentation/pwm: Fix trivial typos
2013-10-24 10:51:33 +02:00
doc: fix some typos in documentations
2013-12-02 14:45:19 +01:00
Documentation/robust-futex-API: Count properly to 4
2013-11-30 14:08:28 +01:00
Documentation: remove __dev* attributes.
2013-01-03 15:57:16 -08:00
doc: fix some typos in documentations
2013-12-02 14:45:19 +01:00
rtc: add ability to push out an existing wakealarm using sysfs
2013-07-03 16:07:54 -07:00
sched: Rename sched.c as sched/core.c in comments and Documentation
2013-06-19 12:58:42 +02:00
doc: fix some typos in documentations
2013-12-02 14:45:19 +01:00
Finally eradicate CONFIG_HOTPLUG
2013-06-03 14:20:18 -07:00
Documentation/SubmittingPatches: Request summaries for commit references
2013-08-20 12:58:15 +02:00
doc: Fix typo in doucmentations
2013-07-25 12:34:15 +02:00
sysrq: Allow magic SysRq key functions to be disabled through Kconfig
2013-10-16 13:01:44 -07:00
percpu: add documentation on this_cpu operations
2013-04-04 10:24:53 -07:00
ether_addr_equal: Optimize implementation, remove unused compare_ether_addr
2013-12-06 16:37:43 -05:00
vfio: fix documentation
2013-09-05 16:36:21 -06:00
VME: Rename vme_slot_get to avoid confusion with reference counting
2013-12-03 11:15:58 -08:00
workqueue: Correct/Drop references to gcwq in Documentation
2013-08-21 10:32:09 -04:00
mutex: Add support for wound/wait style locks
2013-06-26 12:10:56 +02:00
zorro/UAPI: Disintegrate include/linux/zorro*.h
2013-11-26 11:09:08 +01:00
cd67e10ac6
