Markus Stockhausen
d06f191f8e
md/raid5: introduce configuration option rmw_level ...
Depending on the available coding we allow optimized rmw logic for write
operations. To support easier testing this patch allows manual control
of the rmw/rcw descision through the interface /sys/block/mdX/md/rmw_level.
The configuration can handle three levels of control.
rmw_level=0: Disable rmw for all RAID types. Hardware assisted P/Q
calculation has no implementation path yet to factor in/out chunks of
a syndrome. Enforcing this level can be benefical for slow CPUs with
hardware syndrome support and fast SSDs.
rmw_level=1: Estimate rmw IOs and rcw IOs. Execute rmw only if we will
save IOs. This equals the "old" unpatched behaviour and will be the
default.
rmw_level=2: Execute rmw even if calculated IOs for rmw and rcw are
equal. We might have higher CPU consumption because of calculating the
parity twice but it can be benefical otherwise. E.g. RAID4 with fast
dedicated parity disk/SSD. The option is implemented just to be
forward-looking and will ONLY work with this patch!
Signed-off-by: Markus Stockhausen <stockhausen@collogia.de>
Signed-off-by: NeilBrown <neilb@suse.de>
2015-04-22 08:00:42 +10:00
Revert "x86/PCI: Refine the way to release PCI IRQ resources"
2015-03-20 14:56:19 +01:00
ARM: 8256/1: driver coamba: add device binding path 'driver_override'
2015-02-10 10:23:15 +00:00
android: binder: fix binder mmap failures
2015-03-01 18:43:51 -08:00
libata: Blacklist queued TRIM on Samsung SSD 850 Pro
2015-03-27 15:22:46 -04:00
regmap: Fix for v4.0
2015-03-24 16:42:54 -07:00
NVMe: Initialize device list head before starting
2015-03-23 09:35:12 -06:00
Bluetooth: btusb: Fix issue with CSR based Intel Wireless controllers
2015-02-23 09:30:35 +02:00
ARM: SoC platform changes
2015-02-17 09:27:54 -08:00
Not entirely surprising: the ongoing QEMU work on virtio 1.0 has revealed
2015-03-17 10:36:01 -07:00
The clk fixes for 4.0-rc4 comprise three themes. First are the usual
2015-03-15 15:07:08 -07:00
clocksource/drivers/sun5i: Fix cpufreq interaction with sched_clock()
2015-03-26 10:59:40 +01:00
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: mvebu: Update cpuidle thresholds for Armada XP SOCs
2015-03-13 18:31:29 +01:00
Merge branch 'for-linus' of git://git.infradead.org/users/vkoul/slave-dma
2015-02-18 08:49:20 -08:00
Merge branches 'pm-cpufreq', 'pm-cpuidle', 'pm-devfreq', 'pm-opp' and 'pm-tools'
2015-02-13 21:39:06 +01:00
dmaengine: moxart-dma: Fix memory leak when stopping a running transfer
2015-03-30 23:17:08 +05:30
* A fix to sb_edac for proper detection on SNB machines
2015-02-19 11:18:14 -08:00
* Fix integer overflow issue in the DMI SMBIOS 3.0 code when
2015-03-31 10:45:47 +02:00
gpio: syscon: reduce message level when direction reg offset not in dt
2015-03-27 11:17:08 +01:00
Merge branch 'drm-fixes-4.0' of git://people.freedesktop.org/~agd5f/linux into drm-fixes
2015-04-03 09:28:55 +10:00
HID: wacom: check for wacom->shared before following the pointer
2015-03-17 20:59:55 +01:00
Char / Misc patches for 3.20-rc1
2015-02-15 10:48:44 -08:00
hwmon: (ads7828) Check return value of devm_regmap_init_i2c
2015-02-22 20:10:30 -08:00
Revert "i2c: core: Dispose OF IRQ mapping at client removal time"
2015-03-12 10:23:05 +01:00
ide_tape: convert jiffies with jiffies_to_msecs
2015-03-18 23:25:57 -04:00
intel_idle: Add ->enter_freeze callbacks
2015-02-15 19:40:09 +01:00
iio: imu: Use iio_trigger_get for indio_dev->trig assignment
2015-03-28 13:51:40 +00:00
IB/uverbs: Prevent integer overflow in ib_umem_get address arithmetic
2015-04-02 09:53:59 -07:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
2015-04-06 14:10:08 -07:00
iommu/vt-d: Remove unused variable
2015-03-24 15:39:26 +01:00
Merge branch 'irqchip/urgent-gic' into irqchip/urgent
2015-03-29 19:34:05 +00:00
isdn: icn: use strlcpy() when parsing setup options
2015-03-15 22:24:37 -04:00
lguest: now needs PCI_DIRECT.
2015-04-01 10:29:05 -07:00
Merge branch 'mailbox-devel' of git://git.linaro.org/landing-teams/working/fujitsu/integration
2015-02-11 12:56:40 -08:00
md/raid5: introduce configuration option rmw_level
2015-04-22 08:00:42 +10:00
mm: gup: use get_user_pages_unlocked
2015-02-11 17:06:05 -08:00
mfd: kempld-core: Fix callback return value check
2015-03-12 09:27:58 +00:00
mei: make device disabled on stop unconditionally
2015-03-01 19:34:50 -08:00
mmc: pwrseq_simple: fix error path in mmc_pwrseq_simple_alloc
2015-03-19 11:26:35 +01:00
This pull request fixes a bug introduced during the v4.0 merge window where we
2015-03-21 10:36:44 -07:00
net/mlx4_core: Fix error message deprecation for ConnectX-2 cards
2015-04-06 17:32:27 -04:00
drivers/of: Add empty ranges quirk for PA-Semi
2015-03-27 19:31:16 -07:00
PCI updates for v4.0:
2015-03-12 09:45:46 -07:00
Revert "pcmcia: add a new resource manager for non ISA systems"
2015-03-11 14:21:23 +01:00
phy: omap-usb2: Fix missing clk_prepare call when using old dt name
2015-03-13 17:14:39 +05:30
pinctrl: sun4i: GPIOs configured as irq must be set to input before reading
2015-03-18 10:56:46 +01:00
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
Merge branches 'pnp', 'pm-cpuidle' and 'pm-cpufreq'
2015-02-21 04:29:16 +01:00
powercap / RAPL: handle domains with different energy units
2015-03-13 23:18:44 +01:00
pwm: tegra: Use NSEC_PER_SEC
2015-02-18 08:40:29 +01:00
Merge branch 'for-linus' of git://git.infradead.org/users/vkoul/slave-dma
2015-02-18 08:49:20 -08:00
Merge remote-tracking branches 'regulator/fix/doc' and 'regulator/fix/palmas' into regulator-linus
2015-03-23 11:43:42 -07:00
virtio_rpmsg: set DRIVER_OK before using device
2015-03-13 15:55:42 +10:30
drivers/rtc/rtc-mrst: fix suspend/resume
2015-03-25 16:20:30 -07:00
s390/dcss: array index 'i' is used before limits check.
2015-02-26 09:24:48 +01:00
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
drivers: sh: Disable PM runtime for multi-platform r8a7740 with genpd
2015-02-24 07:26:12 +09:00
ARM: SoC driver updates
2015-02-17 09:38:59 -08:00
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
treewide: Remove unnecessary SSB_DEVTABLE_END macro
2015-02-11 14:38:29 -08:00
3rd set of IIO fixes for the 4.0 cycle.
2015-03-24 22:55:20 +01:00
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
thermal: Make sysfs attributes of cooling devices default attributes
2015-03-05 01:47:57 -04:00
tty: serial: fsl_lpuart: clear receive flag on FIFO flush
2015-03-26 23:13:14 +01:00
USB-serial fixes for v4.0-rc6
2015-04-01 13:42:58 +02:00
USB patches for 3.20-rc1
2015-02-15 10:24:55 -08:00
vfio-pci: Add missing break to enable VFIO_PCI_ERR_IRQ_INDEX
2015-03-12 09:51:38 -06:00
Merge git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending
2015-03-21 11:24:38 -07:00
OMAPDSS: fix regression with display sysfs files
2015-02-26 10:23:15 +02:00
virtio_mmio: fix access width for mmio
2015-03-17 12:12:21 +10:30
watchdog: imgpdc: Fix default heartbeat
2015-03-27 08:47:50 +01:00
xen: regression fixes for 4.0-rc6
2015-04-02 13:53:53 -07:00
d06f191f8e