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Joe Thornber e65ff8703f dm cache policy mq: try not to writeback data that changed in the last second 
Writeback takes out a lock on the cache block, so will increase the
latency for any concurrent io.

This patch works by placing 2 sentinel objects on each level of the
multiqueues.  Every WRITEBACK_PERIOD the oldest sentinel gets moved to
the newest end of the queue level.

When looking for writeback work:
  if less than 25% of the cache is clean:
    we select the oldest object with the lowest hit count
  otherwise:
    we select the oldest object that is not past a writeback sentinel.

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
 		2015-03-31 12:03:48 -04:00
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accessibility
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acpi Revert "x86/PCI: Refine the way to release PCI IRQ resources" 2015-03-20 14:56:19 +01:00
amba ARM: 8256/1: driver coamba: add device binding path 'driver_override' 2015-02-10 10:23:15 +00:00
android android: binder: fix binder mmap failures 2015-03-01 18:43:51 -08:00
ata ata: Add a new flag to destinguish sas controller 2015-03-19 14:14:43 -04:00
atm
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auxdisplay
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base regmap: Fix for v4.0 2015-03-24 16:42:54 -07:00
bcma bcma: implement host code support for PCIe Gen 2 devices 2015-01-29 10:54:43 +02:00
block NVMe: Initialize device list head before starting 2015-03-23 09:35:12 -06:00
bluetooth Bluetooth: btusb: Fix issue with CSR based Intel Wireless controllers 2015-02-23 09:30:35 +02:00
bus ARM: SoC platform changes 2015-02-17 09:27:54 -08:00
cdrom
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char Not entirely surprising: the ongoing QEMU work on virtio 1.0 has revealed 2015-03-17 10:36:01 -07:00
clk The clk fixes for 4.0-rc4 comprise three themes. First are the usual 2015-03-15 15:07:08 -07:00
clocksource clocksource/drivers/sun5i: Fix cpufreq interaction with sched_clock() 2015-03-26 10:59:40 +01:00
connector
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coresight coresight: fix function etm_writel_cp14() parameter order 2015-02-04 10:42:55 -08:00
cpufreq Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux-soc-thermal 2015-03-06 13:43:33 -08:00
cpuidle cpuidle: mvebu: Update cpuidle thresholds for Armada XP SOCs 2015-03-13 18:31:29 +01:00
crypto Merge branch 'for-linus' of git://git.infradead.org/users/vkoul/slave-dma 2015-02-18 08:49:20 -08:00
dca
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devfreq Merge branches 'pm-cpufreq', 'pm-cpuidle', 'pm-devfreq', 'pm-opp' and 'pm-tools' 2015-02-13 21:39:06 +01:00
dio
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dma dmaengine: pl08x: Define capabilities for generic capabilities reporting 2015-03-18 21:34:29 +05:30
dma-buf
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edac * A fix to sb_edac for proper detection on SNB machines 2015-02-19 11:18:14 -08:00
eisa
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extcon
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firewire firewire: core: use correct vendor/model IDs 2015-02-02 21:56:03 +01:00
firmware * Fix regression in DMI sysfs code for handling "End of Table" entry 2015-03-02 14:18:57 +01:00
fmc
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gpio gpio: tps65912: fix wrong container_of arguments 2015-02-23 15:40:32 +01:00
gpu drm/i915: Fixup legacy plane->crtc link for initial fb config 2015-03-26 13:39:04 +02:00
hid HID: wacom: check for wacom->shared before following the pointer 2015-03-17 20:59:55 +01:00
hsi
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hv Char / Misc patches for 3.20-rc1 2015-02-15 10:48:44 -08:00
hwmon hwmon: (ads7828) Check return value of devm_regmap_init_i2c 2015-02-22 20:10:30 -08:00
hwspinlock
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i2c Revert "i2c: core: Dispose OF IRQ mapping at client removal time" 2015-03-12 10:23:05 +01:00
ide ide_tape: convert jiffies with jiffies_to_msecs 2015-03-18 23:25:57 -04:00
idle intel_idle: Add ->enter_freeze callbacks 2015-02-15 19:40:09 +01:00
iio Second round of IIO fixes for the 4.0 cycle (or round one part two really!) 2015-02-28 07:19:27 -08:00
infiniband IB/mlx4: Saturate RoCE port PMA counters in case of overflow 2015-03-18 15:17:11 -04:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2015-03-19 16:43:10 -07:00
iommu iommu/io-pgtable-arm: Add built time dependency 2015-03-03 14:04:12 +01:00
ipack
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irqchip Merge branch 'irqchip/urgent-gic' into irqchip/urgent 2015-03-15 01:41:26 +00:00
isdn isdn: icn: use strlcpy() when parsing setup options 2015-03-15 22:24:37 -04:00
leds leds: leds-gpio: Pass on error codes unmodified 2015-02-02 14:36:10 -08:00
lguest OK, this has the big virtio 1.0 implementation, as specified by OASIS. 2015-02-18 09:24:01 -08:00
macintosh
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mailbox Merge branch 'mailbox-devel' of git://git.linaro.org/landing-teams/working/fujitsu/integration 2015-02-11 12:56:40 -08:00
mcb mcb: Fix error path of mcb_pci_probe 2015-02-03 15:48:51 -08:00
md dm cache policy mq: try not to writeback data that changed in the last second 2015-03-31 12:03:48 -04:00
media mm: gup: use get_user_pages_unlocked 2015-02-11 17:06:05 -08:00
memory memory/fsl-corenet-cf: Add t1040 support 2015-01-29 22:57:43 -06:00
memstick
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message i2o: move to staging 2015-02-03 15:58:39 -08:00
mfd mfd: kempld-core: Fix callback return value check 2015-03-12 09:27:58 +00:00
misc mei: make device disabled on stop unconditionally 2015-03-01 19:34:50 -08:00
mmc mmc: pwrseq_simple: fix error path in mmc_pwrseq_simple_alloc 2015-03-19 11:26:35 +01:00
mtd This pull request fixes a bug introduced during the v4.0 merge window where we 2015-03-21 10:36:44 -07:00
net cx82310_eth: wait for firmware to become ready 2015-03-21 18:23:19 -04:00
nfc NFC: nci: Move NFCEE discovery logic 2015-02-04 09:15:18 +01:00
ntb
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nubus
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of Revert "of: Fix premature bootconsole disable with 'stdout-path'" 2015-03-19 08:46:54 -05:00
oprofile
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parisc
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parport
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pci PCI updates for v4.0: 2015-03-12 09:45:46 -07:00
pcmcia Revert "pcmcia: add a new resource manager for non ISA systems" 2015-03-11 14:21:23 +01:00
phy phy: omap-usb2: Fix missing clk_prepare call when using old dt name 2015-03-13 17:14:39 +05:30
pinctrl pinctrl: sun4i: GPIOs configured as irq must be set to input before reading 2015-03-18 10:56:46 +01:00
platform Merge branch 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-02-21 11:12:07 -08:00
pnp Merge branches 'pnp', 'pm-cpuidle' and 'pm-cpufreq' 2015-02-21 04:29:16 +01:00
power
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powercap powercap / RAPL: handle domains with different energy units 2015-03-13 23:18:44 +01:00
pps
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ps3
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ptp
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pwm pwm: tegra: Use NSEC_PER_SEC 2015-02-18 08:40:29 +01:00
rapidio Merge branch 'for-linus' of git://git.infradead.org/users/vkoul/slave-dma 2015-02-18 08:49:20 -08:00
ras
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regulator Merge remote-tracking branches 'regulator/fix/doc' and 'regulator/fix/palmas' into regulator-linus 2015-03-23 11:43:42 -07:00
remoteproc
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reset
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rpmsg virtio_rpmsg: set DRIVER_OK before using device 2015-03-13 15:55:42 +10:30
rtc drivers/rtc/rtc-mrst: fix suspend/resume 2015-03-25 16:20:30 -07:00
s390 s390/dcss: array index 'i' is used before limits check. 2015-02-26 09:24:48 +01:00
sbus
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scsi Merge branch 'for-4.0-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata 2015-03-24 17:08:29 -07:00
sfi
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sh drivers: sh: Disable PM runtime for multi-platform r8a7740 with genpd 2015-02-24 07:26:12 +09:00
sn
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soc ARM: SoC driver updates 2015-02-17 09:38:59 -08:00
spi Merge remote-tracking branches 'spi/fix/dw', 'spi/fix/queue' and 'spi/fix/qup' into spi-linus 2015-03-24 10:38:44 -07:00
spmi
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ssb treewide: Remove unnecessary SSB_DEVTABLE_END macro 2015-02-11 14:38:29 -08:00
staging vt6655: Fix late setting of byRFType. 2015-03-09 11:33:13 +01:00
target target: do not reject FUA CDBs when write cache is enabled but emulate_write_cache is 0 2015-03-19 23:26:46 -07:00
tc
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thermal thermal: Make sysfs attributes of cooling devices default attributes 2015-03-05 01:47:57 -04:00
thunderbolt
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tty serial: 8250_dw: Fix deadlock in LCR workaround 2015-03-11 16:39:52 +01:00
uio
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usb USB / PHY driver fixes for 4.0-rc5 2015-03-22 11:33:55 -07:00
uwb USB patches for 3.20-rc1 2015-02-15 10:24:55 -08:00
vfio vfio-pci: Add missing break to enable VFIO_PCI_ERR_IRQ_INDEX 2015-03-12 09:51:38 -06:00
vhost Merge git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending 2015-03-21 11:24:38 -07:00
video OMAPDSS: fix regression with display sysfs files 2015-02-26 10:23:15 +02:00
virt
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virtio virtio_mmio: fix access width for mmio 2015-03-17 12:12:21 +10:30
vlynq
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vme
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w1
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watchdog watchdog: imgpdc: Fix default heartbeat 2015-03-27 08:47:50 +01:00
xen Merge git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending 2015-03-21 11:24:38 -07:00
zorro
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Kconfig i2o: move to staging 2015-02-03 15:58:39 -08:00
Makefile
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