dect
/
linux-2.6
Archived
13
0
Fork 0
Code Releases Activity
This repository has been archived on 2022-02-17. You can view files and clone it, but cannot push or open issues or pull requests.
linux-2.6/drivers
History
Nick Piggin 2a4419b5b2 fs: fs_struct rwlock to spinlock 
fs: fs_struct rwlock to spinlock

struct fs_struct.lock is an rwlock with the read-side used to protect root and
pwd members while taking references to them. Taking a reference to a path
typically requires just 2 atomic ops, so the critical section is very small.
Parallel read-side operations would have cacheline contention on the lock, the
dentry, and the vfsmount cachelines, so the rwlock is unlikely to ever give a
real parallelism increase.

Replace it with a spinlock to avoid one or two atomic operations in typical
path lookup fastpath.

Signed-off-by: Nick Piggin <npiggin@kernel.dk>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
 		2010-08-18 08:35:46 -04:00
..
accessibility
…
acpi Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6 2010-08-15 17:37:07 -07:00
amba
…
ata Merge branch 'linus' into release 2010-08-15 01:06:31 -04:00
atm Merge branch 'next-devicetree' of git://git.secretlab.ca/git/linux-2.6 2010-08-12 09:11:31 -07:00
auxdisplay
…
base
…
block Merge branch 'next-devicetree' of git://git.secretlab.ca/git/linux-2.6 2010-08-12 09:11:31 -07:00
bluetooth
…
cdrom
…
char Merge branch 'params' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus 2010-08-12 10:01:59 -07:00
clocksource
…
connector
…
cpufreq
…
cpuidle
…
crypto [S390] zcrypt: fix Kconfig dependencies 2010-08-13 10:06:54 +02:00
dca
…
dio
…
dma Merge branch 'next-devicetree' of git://git.secretlab.ca/git/linux-2.6 2010-08-12 09:11:31 -07:00
edac Merge branch 'next-devicetree' of git://git.secretlab.ca/git/linux-2.6 2010-08-12 09:11:31 -07:00
eisa
…
firewire
…
firmware Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6 2010-08-14 12:34:34 -07:00
gpio gpiolib: Implement set_debounce for WM831x GPIOs 2010-08-12 11:27:57 +02:00
gpu Merge git://git.infradead.org/~dwmw2/ideapad-2.6 2010-08-13 18:04:52 -07:00
hid
…
hwmon hwmon: (via-cputemp) Remove bogus "SHOW" global variable 2010-08-14 21:09:02 +02:00
i2c Merge branch 'for-linus/i2c-2636' of git://git.fluff.org/bjdooks/linux 2010-08-14 11:57:54 -07:00
ide
…
idle Merge branch 'idle-release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-idle-2.6 2010-08-15 11:17:52 -07:00
ieee1394
…
ieee802154
…
infiniband Merge branch 'next-devicetree' of git://git.secretlab.ca/git/linux-2.6 2010-08-12 09:11:31 -07:00
input Input: fix faulty XXinput_* calls 2010-08-13 12:03:24 -07:00
isdn Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6 2010-08-13 10:38:12 -07:00
leds Merge branch 'next-devicetree' of git://git.secretlab.ca/git/linux-2.6 2010-08-12 09:11:31 -07:00
lguest
…
macintosh Merge branch 'i2c-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging 2010-08-12 10:06:29 -07:00
mca
…
md dm mpath: support discard 2010-08-12 04:14:32 +01:00
media v4l: Remove reference to bkl ioctl in compat ioctl handling 2010-08-14 00:24:24 +02:00
memstick memstick: fix hangs on unexpected device removal in mspro_blk 2010-08-12 08:43:31 -07:00
message fusion: add function parameter names to kernel-doc 2010-08-14 16:21:00 -07:00
mfd Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/lrg/voltage-2.6 2010-08-12 10:01:30 -07:00
misc Merge branch 'params' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus 2010-08-12 10:01:59 -07:00
mmc Merge branch 'next-spi' of git://git.secretlab.ca/git/linux-2.6 2010-08-14 11:54:09 -07:00
mtd Merge git://git.infradead.org/mtd-2.6 2010-08-15 17:32:47 -07:00
net pcmcia: xirc2ps_cs bugfix 2010-08-13 16:55:26 -07:00
nubus
…
of
…
oprofile
…
parisc
…
parport Merge branch 'next-devicetree' of git://git.secretlab.ca/git/linux-2.6 2010-08-12 09:11:31 -07:00
pci Merge git://git.infradead.org/iommu-2.6 2010-08-15 17:34:20 -07:00
pcmcia Merge branch 'next-devicetree' of git://git.secretlab.ca/git/linux-2.6 2010-08-12 09:11:31 -07:00
platform ideapad: Only allow camera state to be set to 0 or 1 2010-08-11 18:00:52 +01:00
pnp
…
power Merge git://git.infradead.org/battery-2.6 2010-08-12 09:58:33 -07:00
pps
…
ps3
…
rapidio
…
regulator
…
rtc Merge branch 'next-devicetree' of git://git.secretlab.ca/git/linux-2.6 2010-08-12 09:11:31 -07:00
s390 Merge branch 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6 2010-08-13 10:54:04 -07:00
sbus
…
scsi Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6 2010-08-14 12:34:34 -07:00
serial Merge branch 'next-devicetree' of git://git.secretlab.ca/git/linux-2.6 2010-08-12 09:11:31 -07:00
sfi
…
sh
…
sn
…
spi Merge branch 'next-spi' of git://git.secretlab.ca/git/linux-2.6 2010-08-14 11:54:09 -07:00
ssb
…
staging fs: fs_struct rwlock to spinlock 2010-08-18 08:35:46 -04:00
tc
…
telephony
…
thermal
…
uio
…
usb Merge branch 'i2c-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging 2010-08-12 10:06:29 -07:00
uwb
…
vhost
…
video Merge branch 'i2c-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging 2010-08-12 10:06:29 -07:00
virtio
…
vlynq
…
w1
…
watchdog watchdog: hpwdt (12/12): Make NMI decoding a compile-time option 2010-08-13 20:54:53 +00:00
xen Merge branch 'stable/xen-swiotlb-0.8.6' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen 2010-08-12 09:09:41 -07:00
zorro
…
Kconfig
…
Makefile
…