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David Brownell b963801164 USB: ehci-hcd unlink speedups 
This patch fixes some performance bugs observed with some workloads
when unlinking EHCI queue header (QH) descriptors from the async ring
(control/bulk schedule).

The mechanism intended to defer unlinking an empty QH (so there is no
penalty in common cases where it's quickly reused) was not working as
intended.  Sometimes the unlink was scheduled:

 - too quickly ... which can be a *strong* negative effect, since
   that QH becomes unavailable for immediate re-use;

 - too slowly ... wasting DMA cycles, usually a minor issue except
   for increased bus contention and power usage;

Plus there was an extreme case of "too slowly":  a logical error in the
IAA watchdog-timer conversion meant that sometimes the unlink never
got scheduled.

The fix replaces a simple counter with a timestamp derived from the
controller's 8 KHz microframe counter, and adjusts the timer usage
for some issues associated with HZ being less than 8K.

(Based on a patch originally by Alan Stern, and good troubleshooting
from  Leonid.)

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Leonid <leonidv11@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2008-07-21 15:16:27 -07:00
..
accessibility
acpi APCI: revert another duplicated patch 2008-07-20 17:14:57 -07:00
amba
ata Merge commit 'origin/master' 2008-07-16 11:07:59 +10:00
atm Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux-2.6 2008-07-18 02:39:39 -07:00
auxdisplay Miguel Ojeda has moved 2008-07-04 10:40:05 -07:00
base Merge branch 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6 2008-07-16 17:25:46 -07:00
block m68k: Return -ENODEV if no device is found 2008-07-20 17:24:38 -07:00
bluetooth Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6 2008-07-20 17:43:29 -07:00
cdrom cdrom: revert commit 22a9189 (cdrom: use kmalloced buffers instead of buffers on stack) 2008-07-04 09:52:14 +02:00
char Merge branch 'x86/for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2008-07-21 10:34:25 -07:00
clocksource Fix printk format warning in clocksource/acpi_pm.c 2008-07-15 11:01:39 -07:00
connector
cpufreq
cpuidle
crypto crypto: ixp4xx - Select CRYPTO_AUTHENC 2008-07-13 20:12:11 +08:00
dca
dio dio: use dio_match_device() in dio_bus_match() 2008-07-20 17:24:40 -07:00
dma
edac
eisa
firewire Merge branch 'sbp2-spindown' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6 2008-07-15 12:39:44 -07:00
firmware Merge git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git 2008-07-14 15:51:11 -07:00
gpio gpio: pca953x (i2c) handles max7310 too 2008-07-04 10:40:06 -07:00
gpu drm/radeon: fixup issue with radeon and PAT support. 2008-07-15 15:48:05 +10:00
hid Merge commit 'v2.6.26' into bkl-removal 2008-07-14 15:29:34 -06:00
hwmon Merge master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux-2.6 into next 2008-07-21 00:55:14 -04:00
i2c i2c: Convert the max6875 driver to a new-style i2c driver 2008-07-16 19:30:07 +02:00
ide Merge git://git.kernel.org/pub/scm/linux/kernel/git/brodo/pcmcia-fixes-2.6 2008-07-17 10:55:07 -07:00
ieee1394 Merge branch 'sbp2-spindown' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6 2008-07-15 12:39:44 -07:00
infiniband Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux-2.6 2008-07-18 02:39:39 -07:00
input Merge master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux-2.6 into next 2008-07-21 00:55:14 -04:00
isdn Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6 2008-07-20 17:43:29 -07:00
leds
lguest Merge branch 'generic-ipi' into generic-ipi-for-linus 2008-07-15 21:55:59 +02:00
macintosh Merge master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux-2.6 into next 2008-07-21 00:55:14 -04:00
mca
md Merge git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-2.6-dm 2008-07-21 10:30:10 -07:00
media Merge git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/v4l-dvb 2008-07-20 21:14:42 -07:00
memstick
message Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6 2008-07-15 18:58:04 -07:00
mfd mfd: let asic3 use mem resource instead of bus_shift 2008-07-20 19:56:44 +02:00
misc fujitsu-laptop: depends on INPUT 2008-07-16 23:27:03 +02:00
mmc Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/drzeus/mmc 2008-07-16 15:17:52 -07:00
mtd [MIPS] MTX-1 flash partition setup move to platform devices registration 2008-07-15 18:44:38 +01:00
net Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6 2008-07-21 11:29:52 -07:00
nubus
of OpenFirmware: Include <linux/of_i2c.h> from of_i2c.c. 2008-07-12 12:10:52 -06:00
oprofile
parisc
parport
pci pci kernel-doc fatal error 2008-07-21 10:43:26 -07:00
pcmcia Merge git://git.kernel.org/pub/scm/linux/kernel/git/brodo/pcmcia-fixes-2.6 2008-07-17 10:55:07 -07:00
pnp PNPACPI: add support for HP vendor-specific CCSR descriptors 2008-07-16 23:27:07 +02:00
power
ps3
rapidio rapidio: fix device reference counting 2008-07-10 18:04:43 -07:00
rtc Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm 2008-07-14 16:06:58 -07:00
s390 Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux-2.6 2008-07-18 02:39:39 -07:00
sbus drivers/sbus/: cleanups 2008-07-17 21:38:17 -07:00
scsi scsi_dh: Verify "dev" is a sdev before accessing it. 2008-07-16 17:54:21 -07:00
serial atmel_serial: Fix tty_port breakage 2008-07-20 17:12:37 -07:00
sh
sn
spi Merge commit '85082fd7cbe3173198aac0eb5e85ab1edcc6352c' into test-build 2008-07-15 15:44:51 +10:00
ssb Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2008-07-08 16:30:17 -07:00
tc
telephony
thermal
uio Merge commit 'v2.6.26' into bkl-removal 2008-07-14 15:29:34 -06:00
usb USB: ehci-hcd unlink speedups 2008-07-21 15:16:27 -07:00
video export c2p 2008-07-20 17:24:39 -07:00
virtio
w1 w1/ds2482: Convert to a new-style driver 2008-07-16 19:30:07 +02:00
watchdog Merge commit 'origin/master' 2008-07-16 11:07:59 +10:00
xen Merge branch 'x86/paravirt-spinlocks' into x86/for-linus 2008-07-21 16:45:56 +02:00
zorro zorro: use memory_read_from_buffer 2008-07-20 17:24:38 -07:00
Kconfig
Makefile gpu: re-order GPU subdirectory vs char for AGP vs DRM startup. 2008-07-21 08:42:49 +10:00