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Tang Junhui a8394090a9 bcache: correct cache_dirty_target in __update_writeback_rate() 
__update_write_rate() uses a Proportion-Differentiation Controller
algorithm to control writeback rate. A dirty target number is used in
this PD controller to control writeback rate. A larger target number
will make the writeback rate smaller, on the versus, a smaller target
number will make the writeback rate larger.

bcache uses the following steps to calculate the target number,
1) cache_sectors = all-buckets-of-cache-set * buckets-size
2) cache_dirty_target = cache_sectors * cached-device-writeback_percent
3) target = cache_dirty_target *
(sectors-of-cached-device/sectors-of-all-cached-devices-of-this-cache-set)

The calculation at step 1) for cache_sectors is incorrect, which does
not consider dirty blocks occupied by flash only volume.

A flash only volume can be took as a bcache device without cached
device. All data sectors allocated for it are persistent on cache device
and marked dirty, they are not touched by bcache writeback and garbage
collection code. So data blocks of flash only volume should be ignore
when calculating cache_sectors of cache set.

Current code does not subtract dirty sectors of flash only volume, which
results a larger target number from the above 3 steps. And in sequence
the cache device's writeback rate is smaller then a correct value,
writeback speed is slower on all cached devices.

This patch fixes the incorrect slower writeback rate by subtracting
dirty sectors of flash only volumes in __update_writeback_rate().

(Commit log composed by Coly Li to pass checkpatch.pl checking)

Signed-off-by: Tang Junhui <tang.junhui@zte.com.cn>
Reviewed-by: Coly Li <colyli@suse.de>
Cc: stable@vger.kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
 		2017-09-06 08:17:33 -06:00
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accessibility
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acpi Merge branches 'acpica-fix', 'acpi-ec-fix' and 'acpi-properties-fix' 2017-08-24 22:22:53 +02:00
amba
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android ANDROID: binder: fix proc->tsk check. 2017-08-22 18:42:57 -07:00
ata libata: fix a couple of doc build warnings 2017-07-31 08:03:06 -07:00
atm atm: zatm: Fix an error handling path in 'zatm_init_one()' 2017-07-18 11:37:46 -07:00
auxdisplay
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base driver core fixes for 4.13-rc5 2017-08-13 12:44:18 -07:00
bcma
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block block/loop: remove unused field 2017-09-01 13:57:35 -06:00
bluetooth Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2017-07-05 12:31:59 -07:00
bus bus: uniphier-system-bus: set up registers when resuming 2017-08-04 12:57:18 +02:00
cdrom block: don't set bounce limit in blk_init_queue 2017-06-27 12:13:45 -06:00
char random: fix warning message on ia64 and parisc 2017-08-08 09:36:46 -07:00
clk clk: keystone: sci-clk: Fix sci_clk_get 2017-08-02 18:37:26 -07:00
clocksource clocksource/drivers/Kconfig: Fix CLKSRC_PISTACHIO dependencies 2017-08-11 12:53:29 +02:00
connector
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cpufreq cpufreq: intel_pstate: report correct CPU frequencies during trace 2017-08-11 01:25:53 +02:00
cpuidle powerpc/powernv/idle: Disable LOSE_FULL_CONTEXT states when stop-api fails 2017-08-08 20:21:23 +10:00
crypto crypto: ixp4xx - Fix error handling path in 'aead_perform()' 2017-08-09 20:01:33 +08:00
dax - A few DM integrity fixes that improve performance. One that address 2017-07-28 12:17:17 -07:00
dca
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devfreq PM / devfreq: constify attribute_group structures. 2017-07-06 10:17:24 +09:00
dio
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dma dmaengine: tegra210-adma: fix of_irq_get() error check 2017-08-09 11:39:16 +05:30
dma-buf dma-buf/sync_file: Allow multiple sync_files to wrap a single dma-fence 2017-07-31 10:55:24 -03:00
edac EDAC, pnd2: Fix Apollo Lake DIMM detection 2017-06-29 10:37:50 +02:00
eisa
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extcon
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firewire
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firmware efi: avoid fortify checks in EFI stub 2017-07-12 16:26:02 -07:00
fmc
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fpga
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fsi drivers/fsi: fix fsi_slave_mode prototype 2017-07-17 16:13:54 +02:00
gpio gpio: mvebu: Fix cause computation in irq handler 2017-08-14 15:00:43 +02:00
gpu Merge tag 'drm-misc-fixes-2017-08-24' of git://anongit.freedesktop.org/git/drm-misc into drm-fixes 2017-08-25 09:29:38 +10:00
hid HID: ortek: add one more buggy device 2017-07-24 17:38:21 +02:00
hsi HSI changes for the v4.13 series 2017-07-04 14:28:22 -07:00
hv vmbus: re-enable channel tasklet 2017-07-17 15:00:47 +02:00
hwmon hwmon: (applesmc) Avoid buffer overruns 2017-07-15 16:38:56 -07:00
hwspinlock
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hwtracing Char/Misc patches for 4.13-rc1 2017-07-03 20:55:59 -07:00
i2c i2c: designware: Fix runtime PM for I2C slave mode 2017-08-17 17:55:29 +02:00
ide ide-floppy: Use blk_rq_is_scsi() 2017-08-18 08:36:58 -06:00
idle intel_idle: Use more common logging style 2017-06-29 22:58:35 +02:00
iio iio: magnetometer: st_magn: remove ihl property for LSM303AGR 2017-08-20 15:21:49 +01:00
infiniband IB/mlx5: Always return success for RoCE modify port 2017-08-24 15:33:33 -04:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2017-08-26 12:48:29 -07:00
iommu iommu: Fix wrong freeing of iommu_device->dev 2017-08-15 13:58:48 +02:00
ipack
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irqchip irqchip fixes for 4.13 2017-08-14 09:34:10 +02:00
isdn mISDN: Fix null pointer dereference at mISDN_FsmNew 2017-08-11 14:56:23 -07:00
leds LED updates for 4.13 2017-07-06 11:32:40 -07:00
lguest
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lightnvm lightnvm: pblk: advance bio according to lba index 2017-07-28 08:06:00 -06:00
macintosh Merge branch 'work.misc-set_fs' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2017-07-05 13:13:32 -07:00
mailbox mailbox: pcc: Fix crash when request PCC channel 0 2017-07-26 02:11:47 +02:00
mcb
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md bcache: correct cache_dirty_target in __update_writeback_rate() 2017-09-06 08:17:33 -06:00
media media: platform: davinci: drop VPFE_CMD_S_CCDC_RAW_PARAMS 2017-07-26 06:14:33 -04:00
memory memory: atmel-ebi: Fix smc cycle xlate converter 2017-07-26 22:37:54 +02:00
memstick
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message
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mfd ARM: SoC fixes for 4.13 2017-08-24 14:01:18 -07:00
misc mei: exclude device from suspend direct complete optimization 2017-08-10 14:13:18 -07:00
mmc mmc: block: prevent propagating R1_OUT_OF_RANGE for open-ending mode 2017-08-21 13:32:31 +02:00
mtd mtd: nand: atmel: Relax tADL_min constraint 2017-08-24 20:59:50 -07:00
mux mux: mux-core: unregister mux_class in mux_exit() 2017-07-17 16:38:35 +02:00
net net/mlx4_core: Enable 4K UAR if SRIOV module parameter is not enabled 2017-08-18 16:15:37 -07:00
nfc NFC 4.13 pull request 2017-07-01 14:30:39 -07:00
ntb ntb: transport shouldn't disable link due to bogus values in SPADs 2017-08-01 13:31:44 -04:00
nubus
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nvdimm block: replace bi_bdev with a gendisk pointer and partitions index 2017-08-23 12:49:55 -06:00
nvme nvme-fabrics: generate spec-compliant UUID NQNs 2017-09-01 09:48:01 +02:00
nvmem nvmem: rockchip-efuse: amend compatible rk322x-efuse to rk3228-efuse 2017-07-17 16:15:57 +02:00
of of: fix DMA mask generation 2017-08-17 10:23:45 +02:00
oprofile
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parisc parisc: pci memory bar assignment fails with 64bit kernels on dino/cujo 2017-08-16 09:50:39 +02:00
parport
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pci pci-v4.13-fixes-3 2017-08-26 12:46:14 -07:00
pcmcia
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perf drivers/perf: arm_pmu: Request PMU SPIs with IRQF_PER_CPU 2017-07-27 13:43:22 +01:00
phy phy: bcm-ns-usb3: fix MDIO_BUS dependency 2017-07-27 17:20:19 -07:00
pinctrl Pin control fixes for the v4.13 cycle: 2017-08-09 14:30:34 -07:00
platform platform/x86: intel-vbtn: match power button on press rather than release 2017-08-05 14:37:19 -07:00
pnp This is the bulk of GPIO changes for the v4.13 series: 2017-07-07 12:40:27 -07:00
power power supply and reset changes for the v4.13 series (part 2) 2017-07-13 11:47:59 -07:00
powercap powercap/RAPL: prevent overridding bits outside of the mask 2017-06-28 00:38:34 +02:00
pps
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ps3
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ptp ptp: introduce ptp auxiliary worker 2017-08-01 15:22:55 -07:00
pwm pwm: Changes for v4.13-rc1 2017-07-13 11:49:52 -07:00
rapidio
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ras arm64 updates for 4.13: 2017-07-05 17:09:27 -07:00
regulator Merge remote-tracking branches 'regulator/topic/settle', 'regulator/topic/tps65910' and 'regulator/topic/tps65917' into regulator-next 2017-07-03 16:52:21 +01:00
remoteproc remoteproc/keystone: Fix circular dependencies for ARM configs 2017-06-27 16:21:34 -07:00
reset ARM: SoC driver updates 2017-07-04 14:47:47 -07:00
rpmsg rpmsg updates for v4.13 2017-07-06 15:38:31 -07:00
rtc rtc: ds1307: fix regmap config 2017-08-21 11:08:03 +02:00
s390 Linux 4.13-rc7 2017-08-28 13:00:44 -06:00
sbus sbus: Convert to using %pOF instead of full_name 2017-07-20 12:37:10 -07:00
scsi SCSI fixes on 20170823 2017-08-23 11:34:40 -07:00
sfi
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sh drivers/sh/intc/virq.c: delete an error message for a failed memory allocation in add_virq_to_pirq() 2017-07-06 16:24:30 -07:00
sn
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soc soc: ti: knav: Add a NULL pointer check for kdev in knav_pool_create 2017-08-21 09:19:50 +02:00
spi Merge branch 'for-spi' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2017-07-08 10:41:53 -07:00
spmi spmi: pmic-arb: Always allocate ppid_to_apid table 2017-07-17 15:00:47 +02:00
ssb
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staging staging: rtl8188eu: add RNX-N150NUB support 2017-08-18 16:01:46 -07:00
target Linux 4.13-rc7 2017-08-28 13:00:44 -06:00
tc
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tee
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thermal Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux 2017-07-14 13:12:32 -07:00
thunderbolt char/misc fixes for 4.13-rc5 2017-08-13 12:41:58 -07:00
tty pty: Repair TIOCGPTPEER 2017-08-24 13:23:03 -07:00
uio
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usb USB fixes for 4.13-rc5 2017-08-13 12:27:42 -07:00
uwb driver core patches for 4.13-rc1 2017-07-03 20:27:48 -07:00
vfio vfio/pci: Fix handling of RC integrated endpoint PCIe capability size 2017-07-27 10:39:33 -06:00
vhost Revert "vhost: cache used event for better performance" 2017-07-29 14:15:56 -07:00
video efifb: allow user to disable write combined mapping. 2017-07-31 18:45:41 +02:00
virt
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virtio virtio_pci: fix cpu affinity support 2017-08-25 21:38:26 +03:00
vlynq
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vme
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w1 w1: omap-hdq: fix error return code in omap_hdq_probe() 2017-07-17 16:48:15 +02:00
watchdog Merge git://www.linux-watchdog.org/linux-watchdog 2017-07-11 09:59:37 -07:00
xen Kbuild fixes for v4.13 2017-08-24 14:22:27 -07:00
zorro
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Kconfig
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Makefile
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