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Minchan Kim bb416d18b8 zram: writeback throttle 
If there are lots of write IO with flash device, it could have a
wearout problem of storage. To overcome the problem, admin needs
to design write limitation to guarantee flash health
for entire product life.

This patch creates a new knob "writeback_limit" for zram.

writeback_limit's default value is 0 so that it doesn't limit
any writeback. If admin want to measure writeback count in a
certain period, he could know it via /sys/block/zram0/bd_stat's
3rd column.

If admin want to limit writeback as per-day 400M, he could do it
like below.

	MB_SHIFT=20
	4K_SHIFT=12
	echo $((400<<MB_SHIFT>>4K_SHIFT)) > \
		/sys/block/zram0/writeback_limit.

If admin want to allow further write again, he could do it like below

	echo 0 > /sys/block/zram0/writeback_limit

If admin want to see remaining writeback budget,

	cat /sys/block/zram0/writeback_limit

The writeback_limit count will reset whenever you reset zram (e.g., system
reboot, echo 1 > /sys/block/zramX/reset) so keeping how many of writeback
happened until you reset the zram to allocate extra writeback budget in
next setting is user's job.

[minchan@kernel.org: v4]
  Link: http://lkml.kernel.org/r/20181203024045.153534-8-minchan@kernel.org
Link: http://lkml.kernel.org/r/20181127055429.251614-8-minchan@kernel.org
Signed-off-by: Minchan Kim <minchan@kernel.org>
Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: Joey Pabalinas <joeypabalinas@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2018-12-28 12:11:49 -08:00
..
accessibility
acpi pstore improvements and refactorings 2018-12-27 11:15:21 -08:00
amba
android
ata
atm
auxdisplay auxdisplay: charlcd: fix x/y command parsing 2018-12-21 21:27:21 +01:00
base drivers/base/memory.c: remove an unnecessary check on NR_MEM_SECTIONS 2018-12-28 12:11:48 -08:00
bcma
block zram: writeback throttle 2018-12-28 12:11:49 -08:00
bluetooth Bluetooth: hci_bcm: Handle specific unknown packets after firmware loading 2018-12-19 13:43:42 +01:00
bus
cdrom
char mm: convert totalram_pages and totalhigh_pages variables to atomic 2018-12-28 12:11:47 -08:00
clk Merge branch 'clk-imx7ulp' into clk-next 2018-12-14 14:03:38 -08:00
clocksource Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2018-12-25 15:44:08 -08:00
connector
cpufreq powerpc updates for 4.21 2018-12-27 10:43:24 -08:00
cpuidle powerpc updates for 4.21 2018-12-27 10:43:24 -08:00
crypto Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2018-12-27 13:53:32 -08:00
dax mm, devm_memremap_pages: fix shutdown handling 2018-12-28 12:11:47 -08:00
dca
devfreq PM / devfreq: add devfreq_suspend/resume() functions 2018-12-11 11:40:13 +09:00
dio
dma dmaengine: dw: Fix FIFO size for Intel Merrifield 2018-12-06 22:53:05 +05:30
dma-buf
edac EDAC, fsl_ddr: Add LS1021A to the list of supported hardware 2018-12-19 11:57:45 +01:00
eisa
extcon
firewire
firmware pstore improvements and refactorings 2018-12-27 11:15:21 -08:00
fmc
fpga
fsi
gnss gnss: sirf: fix activation retry handling 2018-12-06 17:22:23 +01:00
gpio regmap: Updates for v4.21 2018-12-25 14:48:06 -08:00
gpu mm: convert totalram_pages and totalhigh_pages variables to atomic 2018-12-28 12:11:47 -08:00
hid Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/hid/hid 2018-12-10 11:04:41 -08:00
hsi
hv mm: convert totalram_pages and totalhigh_pages variables to atomic 2018-12-28 12:11:47 -08:00
hwmon Merge branch 'x86-amd-nb-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2018-12-26 16:12:50 -08:00
hwspinlock
hwtracing
i2c platform-drivers-x86 for v4.21-1 2018-12-25 11:04:17 -08:00
i3c i3c: master: cdns: fix I2C transfers in Cadence I3C master driver 2018-12-12 17:08:32 +01:00
ide powerpc updates for 4.21 2018-12-27 10:43:24 -08:00
idle
iio platform-drivers-x86 for v4.21-1 2018-12-25 11:04:17 -08:00
infiniband Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-12-20 11:53:36 -08:00
input Merge branch 'parisc-4.21-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux 2018-12-26 11:14:52 -08:00
iommu
ipack
irqchip irqchip updates for 4.21 2018-12-18 18:37:27 +01:00
isdn
leds LEDs for 4.21-rc1 2018-12-25 14:52:50 -08:00
lightnvm
macintosh macintosh: Use of_node_name_{eq, prefix} for node name comparisons 2018-12-22 21:29:56 +11:00
mailbox
mcb
md mm: convert totalram_pages and totalhigh_pages variables to atomic 2018-12-28 12:11:47 -08:00
media mm: convert totalram_pages and totalhigh_pages variables to atomic 2018-12-28 12:11:47 -08:00
memory
memstick
message
mfd mfd: axp20x: use explicit bit defines 2018-12-13 16:40:03 +00:00
misc mm: convert totalram_pages and totalhigh_pages variables to atomic 2018-12-28 12:11:47 -08:00
mmc mmc: core: Use a minimum 1600ms timeout when enabling CACHE ctrl 2018-12-17 08:59:42 +01:00
mtd spi: Updates for v4.21 2018-12-25 14:43:54 -08:00
mux
net Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2018-12-27 13:53:32 -08:00
nfc
ntb
nubus
nvdimm mm, devm_memremap_pages: fix shutdown handling 2018-12-28 12:11:47 -08:00
nvme nvmet-rdma: fix response use after free 2018-12-07 07:11:11 -08:00
nvmem
of Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2018-12-27 13:04:52 -08:00
opp Merge branch 'opp/genpd/propagation' into opp/linux-next 2018-12-14 16:28:52 +05:30
oprofile
parisc mm: convert totalram_pages and totalhigh_pages variables to atomic 2018-12-28 12:11:47 -08:00
parport
pci mm, hmm: mark hmm_devmem_{add, add_resource} EXPORT_SYMBOL_GPL 2018-12-28 12:11:48 -08:00
pcmcia
perf drivers/perf: Add Cavium ThunderX2 SoC UNCORE PMU driver 2018-12-06 13:03:17 +00:00
phy
pinctrl pinctrl: sunxi: a83t: Fix IRQ offset typo for PH11 2018-12-07 13:32:19 +01:00
platform Here's the main MIPS pull for Linux 4.21. Core architecture changes 2018-12-26 10:45:33 -08:00
pnp
power PM / AVS: SmartReflex: Switch to SPDX Licence ID 2018-12-12 13:54:28 +01:00
powercap
pps
ps3
ptp
pwm pwm: imx: Add ipg clock operation 2018-12-24 12:06:56 +01:00
rapidio
ras
regulator Merge remote-tracking branch 'regulator/topic/coupled' into regulator-next 2018-12-21 13:43:35 +00:00
remoteproc
reset
rpmsg
rtc
s390 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-12-09 21:43:31 -08:00
sbus Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-next 2018-12-26 10:32:18 -08:00
scsi Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2018-12-27 13:04:52 -08:00
sfi
sh
siox
slimbus
sn
soc Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2018-12-27 13:04:52 -08:00
soundwire
spi spi: Updates for v4.21 2018-12-25 14:43:54 -08:00
spmi
ssb
staging mm: convert totalram_pages and totalhigh_pages variables to atomic 2018-12-28 12:11:47 -08:00
target Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2018-12-27 13:04:52 -08:00
tc
tee
thermal thermal: stm32: Fix stm_thermal_read_factory_settings 2018-12-10 20:15:28 -08:00
thunderbolt
tty audit/stable-4.21 PR 20181224 2018-12-27 11:58:50 -08:00
uio uio_hv_generic: set callbacks on open 2018-12-11 14:23:17 +01:00
usb Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2018-12-27 13:53:32 -08:00
uwb
vfio vfio_pci: Add NVIDIA GV100GL [Tesla V100 SXM2] subdriver 2018-12-21 16:20:47 +11:00
vhost Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2018-12-27 13:04:52 -08:00
video drm pull request for 4.21-rc1 2018-12-25 11:48:26 -08:00
virt
virtio
visorbus
vlynq
vme
w1
watchdog
xen mm/memory_hotplug: drop "online" parameter from add_memory_resource() 2018-12-28 12:11:48 -08:00
zorro
Kconfig
Makefile