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Coly Li 9aaf516546 bcache: make cutoff_writeback and cutoff_writeback_sync tunable 
Currently the cutoff writeback and cutoff writeback sync thresholds are
defined by CUTOFF_WRITEBACK (40) and CUTOFF_WRITEBACK_SYNC (70) as
static values. Most of time these they work fine, but when people want
to do research on bcache writeback mode performance tuning, there is no
chance to modify the soft and hard cutoff writeback values.

This patch introduces two module parameters bch_cutoff_writeback_sync
and bch_cutoff_writeback which permit people to tune the values when
loading bcache.ko. If they are not specified by module loading, current
values CUTOFF_WRITEBACK_SYNC and CUTOFF_WRITEBACK will be used as
default and nothing changes.

When people want to tune this two values,
- cutoff_writeback can be set in range [1, 70]
- cutoff_writeback_sync can be set in range [1, 90]
- cutoff_writeback always <= cutoff_writeback_sync

The default values are strongly recommended to most of users for most of
workloads. Anyway, if people wants to take their own risk to do research
on new writeback cutoff tuning for their own workload, now they can make
it.

Signed-off-by: Coly Li <colyli@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-12-13 08:15:54 -07:00
..
accessibility
acpi libnvdimm fixes 4.20-rc6 2018-12-09 09:46:54 -08:00
amba
android binder: fix race that allows malicious free of live buffer 2018-11-26 20:01:47 +01:00
ata Linux 4.20-rc6 2018-12-09 17:45:40 -07:00
atm firestream: fix spelling mistake: "Inititing" -> "Initializing" 2018-11-27 15:32:06 -08:00
auxdisplay The Compiler Attributes series 2018-11-01 18:34:46 -07:00
base devres: Align data[] to ARCH_KMALLOC_MINALIGN 2018-11-11 11:40:04 -08:00
bcma
block mtip32xx: use BLK_STS_DEV_RESOURCE for device resources 2018-12-10 14:45:19 -07:00
bluetooth
bus
cdrom
char
clk clk: zynqmp: Off by one in zynqmp_is_valid_clock() 2018-12-03 09:54:48 -08:00
clocksource Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2018-11-11 16:41:50 -06:00
connector
cpufreq cpufreq: ti-cpufreq: Only register platform_device when supported 2018-11-19 11:26:06 +01:00
cpuidle ARM: cpuidle: Convert to use cpuidle_register|unregister() 2018-11-08 18:53:00 +01:00
crypto crypto: hisilicon - Fix reference after free of memories on error path 2018-11-09 17:35:43 +08:00
dax
dca
devfreq
dio
dma dmaengine: dw: Fix FIFO size for Intel Merrifield 2018-12-06 22:53:05 +05:30
dma-buf udmabuf: set read/write flag when exporting 2018-11-16 08:50:53 +01:00
edac * skx_edac: Address translation for NVDIMMs (Tony Luck and Qiuxu Zhuo) 2018-11-02 11:17:22 -07:00
eisa
extcon
firewire
firmware efi: Prevent GICv3 WARN() by mapping the memreserve table before first use 2018-11-27 13:50:20 +01:00
fmc
fpga
fsi fsi: fsi-scom.c: Remove duplicate header 2018-11-26 10:13:04 +11:00
gnss gnss: sirf: fix activation retry handling 2018-12-06 17:22:23 +01:00
gpio ARM: SoC fixes 2018-12-02 12:19:44 -08:00
gpu drm/ast: Fix connector leak during driver unload 2018-12-06 14:12:02 +10:00
hid Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2018-12-04 08:47:04 -08:00
hsi
hv Drivers: hv: vmbus: Offload the handling of channels to two workqueues 2018-12-03 08:01:01 +01:00
hwmon hwmon: (w83795) temp4_type has writable permission 2018-11-18 14:34:56 -08:00
hwspinlock
hwtracing
i2c i2c: uniphier-f: fix violation of tLOW requirement for Fast-mode 2018-12-06 23:14:59 +01:00
ide Linux 4.20-rc6 2018-12-09 17:45:40 -07:00
idle
iio iio/hid-sensors: Fix IIO_CHAN_INFO_RAW returning wrong values for signed numbers 2018-11-16 11:42:12 +00:00
infiniband RDMA/mlx5: Initialize return variable in case pagefault was skipped 2018-11-29 15:16:45 -07:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2018-12-04 08:47:04 -08:00
iommu iommu/vt-d: Use memunmap to free memremap 2018-11-22 17:02:21 +01:00
ipack
irqchip irqchip/irq-mvebu-sei: Fix a NULL vs IS_ERR() bug in probe function 2018-11-01 12:38:48 +01:00
isdn Merge branch 'work.afs' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2018-11-01 19:58:52 -07:00
leds LED fixes for 4.20-rc2 2018-11-08 17:49:04 -06:00
lightnvm lightnvm: pblk: do not overwrite ppa list with meta list 2018-12-11 12:22:35 -07:00
macintosh memblock: stop using implicit alignment to SMP_CACHE_BYTES 2018-10-31 08:54:16 -07:00
mailbox
mcb
md bcache: make cutoff_writeback and cutoff_writeback_sync tunable 2018-12-13 08:15:54 -07:00
media media: dvb-pll: don't re-validate tuner frequencies 2018-11-27 13:51:32 -05:00
memory
memstick ms_block: remove unused pointer 'set' 2018-11-08 06:17:26 -07:00
message
mfd Revert "mfd: cros_ec: Use devm_kzalloc for private data" 2018-12-05 09:59:38 +00:00
misc misc: mic/scif: fix copy-paste error in scif_create_remote_lookup 2018-11-27 09:00:38 +01:00
mmc Linux 4.20-rc5 2018-12-04 09:38:05 -07:00
mtd mtd: nand: Fix memory allocation in nanddev_bbt_init() 2018-11-28 15:41:50 +01:00
mux
net bnxt_en: Fix _bnxt_get_max_rings() for 57500 chips. 2018-12-09 11:46:58 -08:00
nfc
ntb ntb: idt: Alter the driver info comments 2018-11-01 10:33:12 -04:00
nubus
nvdimm Linux 4.20-rc6 2018-12-09 17:45:40 -07:00
nvme lightnvm: disable interleaved metadata 2018-12-11 12:22:35 -07:00
nvmem nvmem: core: fix regression in of_nvmem_cell_get() 2018-11-11 09:15:29 -08:00
of Devicetree fixes for 4.20-rc: 2018-11-09 16:41:58 -06:00
opp OPP: Fix parsing of multiple phandles in "operating-points-v2" property 2018-11-23 10:47:21 +05:30
oprofile
parisc
parport
pci Linux 4.20-rc6 2018-12-09 17:45:40 -07:00
pcmcia
perf
phy phy: qcom-qusb2: Fix HSTX_TRIM tuning with fused value for SDM845 2018-11-21 13:13:58 +05:30
pinctrl pinctrl: meson: fix meson8b ao pull register bits 2018-11-05 09:33:22 +01:00
platform platform-drivers-x86 for v4.20-1 2018-11-01 08:42:21 -07:00
pnp
power
powercap
pps
ps3
ptp
pwm
rapidio
ras
regulator
remoteproc
reset
rpmsg
rtc Staging and IIO driver fixes for 4.20-rc5 2018-11-30 12:23:44 -08:00
s390 Linux 4.20-rc6 2018-12-09 17:45:40 -07:00
sbus drivers/sbus/char: add of_node_put() 2018-12-02 20:55:23 -08:00
scsi Linux 4.20-rc6 2018-12-09 17:45:40 -07:00
sfi mm: remove include/linux/bootmem.h 2018-10-31 08:54:16 -07:00
sh
siox
slimbus slimbus: ngd: remove unnecessary check 2018-11-07 14:59:28 +01:00
sn
soc soc: ti: QMSS: Fix usage of irq_set_affinity_hint 2018-11-02 11:22:09 -07:00
soundwire
spi spi: Fixes for v4.20 2018-11-28 08:33:55 -08:00
spmi
ssb
staging Staging fixes for 4.20-rc6 2018-12-09 10:35:33 -08:00
target sbitmap: optimize wakeup check 2018-11-30 14:48:04 -07:00
tc
tee
thermal thermal: broadcom: constify thermal_zone_of_device_ops structure 2018-12-05 06:47:46 -08:00
thunderbolt thunderbolt: Prevent root port runtime suspend during NVM upgrade 2018-11-26 20:38:49 +01:00
tty TTY driver fixes for 4.20-rc6 2018-12-09 10:24:29 -08:00
uio uio: Fix an Oops on load 2018-11-11 09:21:46 -08:00
usb USB-serial fix for v4.20-rc6 2018-12-06 18:02:58 +01:00
uwb
vfio VFIO updates for v4.20 2018-10-31 11:01:38 -07:00
vhost Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-12-09 15:12:33 -08:00
video fbdev changes for v4.20: 2018-10-31 11:41:37 -07:00
virt
virtio
visorbus
vlynq
vme
w1
watchdog
xen xen: fixes for 4.20-rc5 2018-12-02 12:15:55 -08:00
zorro
Kconfig
Makefile