Shaohua Li 466c08c71a [SCSI] don't change sdev starvation list order without request dispatched ... The sdev is deleted from starved list and then try to dispatch from this device. It's quite possible the sdev can't eventually dispatch a request, then the sdev will be in starved list tail. This isn't fair. There are two cases here: 1. unplug path. scsi_request_fn() calls to scsi_target_queue_ready(), then the dev is removed from starved list, but quite possible host queue isn't ready, the dev is moved to starved list without dispatching any request. 2. scsi_run_queue path. It deletes the dev from starved list first (both global and local starved lists), then handles the dev. Then we could have the same process like case 1. This patch fixes the first case. Case 2 isn't fixed, because there is a rare case scsi_run_queue finds host isn't busy but scsi_request_fn finds host is busy (other CPU is faster to get host queue depth). Not deleting the dev from starved list in scsi_run_queue will keep scsi_run_queue looping (though this is very rare case, because host will become busy). Fortunately fixing case 1 already gives big improvement for starvation in my test. In a 12 disk JBOD setup, running file creation under EXT4, this gives 12% more throughput. Signed-off-by: Shaohua Li <shaohua.li@intel.com> Signed-off-by: James Bottomley <JBottomley@Parallels.com>		2012-01-16 11:54:04 +04:00
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accessibility	…
acpi	Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu	2012-01-10 11:08:21 -08:00
amba	Merge branch 'pm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm	2012-01-08 13:10:57 -08:00
ata	Merge branch 'upstream-linus' of git://github.com/jgarzik/libata-dev	2012-01-10 10:19:17 -08:00
atm	…
auxdisplay	…
base	Merge branch 'dma-buf-merge' of git://people.freedesktop.org/~airlied/linux	2012-01-08 14:05:09 -08:00
bcma	…
block	Merge branch 'stable/for-linus-3.3' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen	2012-01-10 10:09:59 -08:00
bluetooth	Merge branch 'pm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm	2012-01-08 13:10:57 -08:00
cdrom	fs: move code out of buffer.c	2012-01-03 22:54:07 -05:00
char	Merge branch 'drm-core-next' of git://people.freedesktop.org/~airlied/linux	2012-01-10 11:04:36 -08:00
clk	clk: add config option HAVE_CLK_PREPARE into Kconfig	2011-12-28 21:35:06 +08:00
clocksource	Merge branch 'for-linus' of git://ftp.arm.linux.org.uk/pub/linux/arm/kernel/git-cur/linux-2.6-arm	2012-01-06 18:15:25 -08:00
connector	…
cpufreq	Merge branch 'driver-core-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core	2012-01-07 12:03:30 -08:00
cpuidle	cpu: convert 'cpu' and 'machinecheck' sysdev_class to a regular subsystem	2011-12-21 14:29:42 -08:00
crypto	…
dca	…
devfreq	Merge branch 'devfreq-for-next' of git://git.infradead.org/users/kmpark/linux-samsung into pm-devfreq	2011-12-21 09:51:23 +01:00
dio	…
dma	clock management changes for i.MX	2012-01-09 14:44:15 -08:00
edac	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2012-01-08 13:21:22 -08:00
eisa	…
firewire	…
firmware	Merge branch 'for-linus2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2012-01-08 12:19:57 -08:00
gpio	Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl	2012-01-10 10:19:57 -08:00
gpu	Merge branch 'drm-core-next' of git://people.freedesktop.org/~airlied/linux	2012-01-10 11:04:36 -08:00
hid	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid	2012-01-10 10:48:28 -08:00
hv	Merge branch 'usb-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb	2012-01-09 12:09:47 -08:00
hwmon	Merge branch 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging	2012-01-08 13:39:24 -08:00
hwspinlock	…
i2c	Driver specific changes	2012-01-09 14:39:22 -08:00
ide	…
idle	…
ieee802154	…
infiniband	infiniband changes for 3.3 merge window	2012-01-08 14:05:48 -08:00
input	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input	2012-01-10 10:55:52 -08:00
iommu	Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu	2012-01-10 11:08:21 -08:00
isdn	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2012-01-08 13:21:22 -08:00
leds	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2012-01-08 13:21:22 -08:00
lguest	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	2012-01-06 17:22:09 -08:00
macintosh	Merge branch 'driver-core-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core	2012-01-07 12:03:30 -08:00
mca	…
md	md update for 3.3	2012-01-08 13:28:33 -08:00
media	Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu	2012-01-10 11:08:21 -08:00
memstick	…
message	SCSI updates for post 3.2 merge window	2012-01-10 10:36:08 -08:00
mfd	Driver specific changes	2012-01-09 14:39:22 -08:00
misc	Merge branch 'char-misc-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc	2012-01-09 12:08:59 -08:00
mmc	clock management changes for i.MX	2012-01-09 14:44:15 -08:00
mtd	MTD pull for 3.3	2012-01-10 13:45:22 -08:00
net	Merge branch 'stable/for-linus-3.3' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen	2012-01-10 10:09:59 -08:00
nfc	Merge branch 'driver-core-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core	2012-01-07 12:03:30 -08:00
nubus	…
of	devicetree/next changes queued for v3.3 merge window	2012-01-07 12:18:52 -08:00
oprofile	Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2012-01-06 08:02:58 -08:00
parisc	…
parport	Merge branch 'tty-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty	2012-01-09 12:09:24 -08:00
pci	Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu	2012-01-10 11:08:21 -08:00
pcmcia	pcmcia: pxa: replace IRQ_GPIO() with gpio_to_irq()	2011-12-28 10:14:04 +00:00
pinctrl	pinctrl: remove unnecessary max pin number	2012-01-03 09:10:09 +01:00
platform	Merge branch 'pm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm	2012-01-08 13:10:57 -08:00
pnp	…
power	switch ->is_visible() to returning umode_t	2012-01-03 22:54:55 -05:00
pps	…
ps3	…
ptp	…
rapidio	…
regulator	regulator: set constraints.apply_uV to 0 in of_get_fixed_voltage_config	2012-01-06 11:01:09 -08:00
rtc	Driver specific changes	2012-01-09 14:39:22 -08:00
s390	Merge branch 'char-misc-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc	2012-01-09 12:08:59 -08:00
sbus	…
scsi	[SCSI] don't change sdev starvation list order without request dispatched	2012-01-16 11:54:04 +04:00
sfi	…
sh	Merge branch 'pm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm	2012-01-08 13:10:57 -08:00
sn	…
spi	Cleanups for the Samsung platforms	2012-01-09 14:30:28 -08:00
ssb	…
staging	Merge branch 'drm-core-next' of git://people.freedesktop.org/~airlied/linux	2012-01-10 11:04:36 -08:00
target	…
tc	…
telephony	…
thermal	…
tty	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-next	2012-01-09 14:47:06 -08:00
uio	…
usb	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid	2012-01-10 10:48:28 -08:00
uwb	Merge branch 'usb-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb	2012-01-09 12:09:47 -08:00
vhost	…
video	Merge branch 'stable/for-linus-3.3' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen	2012-01-10 10:09:59 -08:00
virt	…
virtio	…
vlynq	…
w1	…
watchdog	Merge git://www.linux-watchdog.org/linux-watchdog	2012-01-10 10:29:23 -08:00
xen	Merge branch 'drm-core-next' of git://people.freedesktop.org/~airlied/linux	2012-01-10 11:04:36 -08:00
zorro	misc latin1 to utf8 conversions	2012-01-02 13:04:55 +01:00
Kconfig	…
Makefile	…