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8d92890bd6
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NeilBrown 8d92890bd6 mm/writeback: discard NR_UNSTABLE_NFS, use NR_WRITEBACK instead 
After an NFS page has been written it is considered "unstable" until a
COMMIT request succeeds.  If the COMMIT fails, the page will be
re-written.

These "unstable" pages are currently accounted as "reclaimable", either
in WB_RECLAIMABLE, or in NR_UNSTABLE_NFS which is included in a
'reclaimable' count.  This might have made sense when sending the COMMIT
required a separate action by the VFS/MM (e.g.  releasepage() used to
send a COMMIT).  However now that all writes generated by ->writepages()
will automatically be followed by a COMMIT (since commit 919e3bd9a8
("NFS: Ensure we commit after writeback is complete")) it makes more
sense to treat them as writeback pages.

So this patch removes NR_UNSTABLE_NFS and accounts unstable pages in
NR_WRITEBACK and WB_WRITEBACK.

A particular effect of this change is that when
wb_check_background_flush() calls wb_over_bg_threshold(), the latter
will report 'true' a lot less often as the 'unstable' pages are no
longer considered 'dirty' (as there is nothing that writeback can do
about them anyway).

Currently wb_check_background_flush() will trigger writeback to NFS even
when there are relatively few dirty pages (if there are lots of unstable
pages), this can result in small writes going to the server (10s of
Kilobytes rather than a Megabyte) which hurts throughput.  With this
patch, there are fewer writes which are each larger on average.

Where the NR_UNSTABLE_NFS count was included in statistics
virtual-files, the entry is retained, but the value is hard-coded as
zero.  static trace points and warning printks which mentioned this
counter no longer report it.

[akpm@linux-foundation.org: re-layout comment]
[akpm@linux-foundation.org: fix printk warning]
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Acked-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Acked-by: Michal Hocko <mhocko@suse.com>	[mm]
Cc: Christoph Hellwig <hch@lst.de>
Cc: Chuck Lever <chuck.lever@oracle.com>
Link: http://lkml.kernel.org/r/87d06j7gqa.fsf@notabene.neil.brown.name
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-06-02 10:59:08 -07:00
..
accessibility
acpi ACPI: EC: PM: Avoid flushing EC work when EC GPE is inactive 2020-05-18 13:15:13 +02:00
amba amba: Initialize dma_parms for amba devices 2020-04-28 17:44:34 +02:00
android Merge 5.6-rc7 into char-misc-next 2020-03-23 07:59:38 +01:00
ata ata: sata_inic162x fix a spelling issue 2020-04-23 09:59:30 -06:00
atm .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
auxdisplay Merge 5.6-rc7 into char-misc-next 2020-03-23 07:59:38 +01:00
base mm/writeback: discard NR_UNSTABLE_NFS, use NR_WRITEBACK instead 2020-06-02 10:59:08 -07:00
bcma
block mm/writeback: replace PF_LESS_THROTTLE with PF_LOCAL_THROTTLE 2020-06-02 10:59:08 -07:00
bluetooth Bluetooth: btusb: print Intel fw build version in power-on boot 2020-03-16 08:57:40 +01:00
bus bus: mhi: core: Fix some error return code 2020-05-15 16:32:20 +02:00
cdrom
char Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2020-06-01 12:00:10 -07:00
clk clk: qcom: gcc: Fix parent for gpll0_out_even 2020-05-26 17:15:06 -07:00
clocksource clocksource/drivers/timer-vf-pit: Add missing parenthesis 2020-04-05 09:24:58 +02:00
connector
counter counter: 104-quad-8: Add lock guards - generic interface 2020-04-19 17:50:00 +01:00
cpufreq cpufreq: intel_pstate: Only mention the BIOS disabling turbo mode once 2020-04-27 10:30:11 +02:00
cpuidle Merge branch 'pm-cpuidle' 2020-04-10 11:32:22 +02:00
crypto Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2020-06-01 12:00:10 -07:00
dax vfs: track per-sb writeback errors and report them to syncfs 2020-06-02 10:59:05 -07:00
dca
devfreq PM / devfreq: Fix handling dev_pm_qos_remove_request result 2020-03-25 08:35:03 +09:00
dio
dma dmaengine: tegra210-adma: Fix an error handling path in 'tegra_adma_probe()' 2020-05-19 22:26:01 +05:30
dma-buf dma-buf: fix documentation build warnings 2020-04-30 19:47:39 +05:30
edac Merge branches 'edac-i10nm' and 'edac-misc' into edac-updates-for-5.8 2020-06-01 11:39:15 +02:00
eisa .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
extcon Char/Misc driver patches for 5.7-rc1 2020-04-03 13:22:40 -07:00
firewire
firmware Printk changes for 5.8 2020-06-01 12:13:30 -07:00
fpga fpga: dfl: pci: fix return value of cci_pci_sriov_configure 2020-03-30 20:45:30 -07:00
fsi
gnss
gpio gpio: fix locking open drain IRQ lines 2020-05-29 14:01:49 +02:00
gpu drm fixes for 5.7 final 2020-05-29 12:32:46 -07:00
greybus
hid HID: quirks: Add HID_QUIRK_NO_INIT_REPORTS quirk for Dell K12A keyboard-dock 2020-05-04 11:24:58 +02:00
hsi
hv hyperv-fixes for 5.7-rc4 2020-04-27 13:28:27 -07:00
hwmon hwmon: Add Baikal-T1 PVT sensor driver 2020-05-28 07:59:45 -07:00
hwspinlock hwspinlock: hwspinlock_internal.h: Replace zero-length array with flexible-array member 2020-03-25 22:30:46 -07:00
hwtracing coresight: cti: remove incorrect NULL return check 2020-05-15 16:32:20 +02:00
i2c i2c: mux: demux-pinctrl: Fix an error handling path in 'i2c_demux_pinctrl_probe()' 2020-05-15 11:23:49 +02:00
i3c i3c master: GETMRL's 3rd byte is optional even with BCR_IBI_PAYLOAD 2020-04-16 14:27:46 +02:00
ide drivers/ide: Fix build regression. 2020-04-04 18:07:59 -07:00
idle Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2020-03-30 16:40:08 -07:00
iio iio: sca3000: Remove an erroneous 'get_device()' 2020-05-10 10:53:36 +01:00
infiniband IB/ipoib: Fix double free of skb in case of multicast traffic in CM mode 2020-05-27 21:14:09 -03:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2020-05-28 12:41:11 -07:00
interconnect interconnect: qcom: Move the static keyword to the front of declaration 2020-04-29 13:11:44 +02:00
iommu iommu: Fix reference count leak in iommu_group_alloc. 2020-05-29 15:27:50 +02:00
ipack ipack: tpci200: fix error return code in tpci200_register() 2020-05-15 16:32:20 +02:00
irqchip Merge branch 'irq/gic-v4.1-fixes-5.7' into irq/irqchip-5.7 2020-04-17 08:59:55 +01:00
isdn mISDN: make dmril and dmrim static 2020-04-16 13:52:31 -07:00
leds leds: core: Fix warning message when init_data 2020-04-06 23:12:08 +02:00
lightnvm for-5.7/drivers-2020-03-29 2020-03-30 11:43:51 -07:00
macintosh Char/Misc driver patches for 5.7-rc1 2020-04-03 13:22:40 -07:00
mailbox mailbox: imx: add SCU MU support 2020-03-19 23:04:32 -05:00
mcb
md md: remove __clear_page_buffers and use attach/detach_page_private 2020-06-02 10:59:07 -07:00
media usb: pulse8-cec: Switch to use %ptT 2020-05-20 14:54:26 +02:00
memory ARM: driver updates 2020-04-03 15:05:35 -07:00
memstick
message scsi: message: fusion: Replace zero-length array with flexible-array member 2020-03-26 22:40:47 -04:00
mfd mfd: Add Gateworks System Controller core driver 2020-05-20 10:28:57 +01:00
misc misc: rtsx: Add short delay after exit from ASPM 2020-05-22 13:27:38 +02:00
mmc mmc: block: Fix use-after-free issue for rpmb 2020-05-25 10:45:17 +02:00
most most: core: use function subsys_initcall() 2020-04-28 15:04:09 +02:00
mtd Fixes and new features for pstore 2020-06-01 12:07:34 -07:00
mux
net drivers/net/ibmvnic: Update VNIC protocol version reporting 2020-05-29 17:20:59 -07:00
nfc Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2020-06-01 12:00:10 -07:00
ntb pci-v5.7-changes 2020-04-03 14:25:02 -07:00
nubus
nvdimm libnvdimm for 5.7 2020-04-08 21:03:40 -07:00
nvme nvme-pci: avoid race between nvme_reap_pending_cqes() and nvme_poll() 2020-05-27 20:32:56 +02:00
nvmem nvmem: core: remove nvmem_sysfs_get_groups() 2020-03-25 19:23:49 +01:00
of of: unittest: kmemleak in duplicate property update 2020-04-17 08:31:34 -05:00
opp opp: Manage empty OPP tables with clk handle 2020-04-13 16:14:55 +05:30
oprofile
parisc parisc: Replace setup_irq() by request_irq() 2020-04-05 22:05:23 +02:00
parport
pci PCI: Move Apex Edge TPU class quirk to fix BAR assignment 2020-04-14 19:16:51 -05:00
pcmcia pcmcia: remove some unused space characters 2020-03-31 18:48:22 +02:00
perf arm64 updates for 5.7: 2020-03-31 10:05:01 -07:00
phy phy: qualcomm: usb-hs-28nm: Prepare clocks in init 2020-04-30 12:10:49 +05:30
pinctrl pinctrl: qcom: Add affinity callbacks to msmgpio IRQ chip 2020-05-12 14:29:29 +02:00
platform Fixes and new features for pstore 2020-06-01 12:07:34 -07:00
pnp
power power: supply: bd70528: rename linear_range to avoid collision 2020-05-08 18:18:13 +01:00
powercap Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2020-03-30 16:40:08 -07:00
pps
ps3 powerpc/ps3: Remove an unneeded NULL check 2020-04-03 00:09:59 +11:00
ptp ptp: Remove unneeded conversion to bool 2020-04-21 15:45:32 -07:00
pwm pwm: pca9685: Fix PWM/GPIO inter-operation 2020-04-03 21:41:42 +02:00
rapidio rapidio: fix an error in get_user_pages_fast() error handling 2020-05-23 10:26:31 -07:00
ras
regulator Merge remote-tracking branch 'regulator/for-5.8' into regulator-linus 2020-06-01 13:01:44 +01:00
remoteproc remoteproc fixes for v5.7 2020-04-23 09:28:15 -07:00
reset
rpmsg rpmsg: pull in slab.h 2020-04-17 06:05:29 -04:00
rtc - New Drivers 2020-04-07 19:48:52 -07:00
s390 s390/ism: fix error return code in ism_probe() 2020-05-13 12:14:51 -07:00
sbus misc: move FLASH_MINOR into miscdevice.h and fix conflicts 2020-03-18 12:27:04 +01:00
scsi scsi: pm: Balance pm_only counter of request queue during system resume 2020-05-11 19:43:25 -04:00
sfi
sh
siox
slimbus slimbus: ngd: add v2.1.0 compatible 2020-03-12 16:51:15 +01:00
soc soc: mediatek: cmdq: return send msg error code 2020-05-16 19:55:50 +02:00
soundwire Char/Misc driver patches for 5.7-rc1 2020-04-03 13:22:40 -07:00
spi Merge remote-tracking branch 'spi/for-5.8' into spi-next 2020-05-30 00:03:53 +01:00
spmi
ssb ssb: Use scnprintf() for avoiding potential buffer overflow 2020-03-12 15:44:12 +02:00
staging iio-fixes-for-5.7b Second set of fixes for IIO in the 5.7 cycle. 2020-05-15 16:04:24 +02:00
target scsi: target: Put lun_ref at end of tmr processing 2020-05-14 20:27:05 -04:00
tc
tee ARM: driver updates 2020-04-03 15:05:35 -07:00
thermal - Convert tsens configuration DT binding to yaml (Rajeshwari) 2020-04-07 20:00:16 -07:00
thunderbolt thunderbolt: Check return value of tb_sw_read() in usb4_switch_op() 2020-04-28 19:00:59 +02:00
tty tty: serial: add missing spin_lock_init for SiFive serial console 2020-05-15 14:55:10 +02:00
uio uio: uio_pdrv_genirq: use new devm_uio_register_device() function 2020-03-18 12:34:10 +01:00
usb USB: gadget: fix illegal array access in binding with UDC 2020-05-15 15:42:17 +02:00
vdpa vdpasim: remove unused variable 'ret' 2020-05-11 06:44:12 -04:00
vfio vfio/type1: Fix VA->PA translation for PFNMAP VMAs in vaddr_get_pfn() 2020-04-23 12:10:01 -06:00
vhost virtio: build warning fixes 2020-05-21 12:59:29 -07:00
video drm fixes for 5.7-rc1 2020-04-07 20:24:34 -07:00
virt virt: vbox: Use fallthrough; 2020-03-19 07:41:03 +01:00
virtio virtio-balloon: Avoid using the word 'report' when referring to free page hinting 2020-04-17 06:05:30 -04:00
visorbus
vlynq
vme
w1
watchdog watchdog: sp805: fix restart handler 2020-04-08 11:18:38 +02:00
xen xen: branch for v5.7-rc2 2020-04-17 10:35:17 -07:00
zorro SPDX patches for 5.7-rc1. 2020-04-03 13:12:26 -07:00
Kconfig virtio: fixes, vdpa 2020-04-08 10:51:53 -07:00
Makefile virtio: fixes, vdpa 2020-04-08 10:51:53 -07:00