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e8b4553457
linux/drivers/staging
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Dan Magenheimer e8b4553457 zcache: Set SWIZ_BITS to 8 to reduce tmem bucket lock contention. 
SWIZ_BITS > 8 results in a much larger number of "tmem_obj"
allocations, likely one per page-placed-in-frontswap.  The
tmem_obj is not huge (roughly 100 bytes), but it is large
enough to add a not-insignificant memory overhead to zcache.

The SWIZ_BITS=8  will get roughly the same lock contention
without the space wastage.

The effect of SWIZ_BITS can be thought of as "2^SWIZ_BITS is
the number of unique oids that be generated" (This concept is
limited to frontswap's use of tmem).

Acked-by: Seth Jennings <sjenning@linux.vnet.ibm.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2012-02-08 14:14:12 -08:00
..
android Staging: android: fixed 80 characters warnings in lowmemorykiller.c 2011-12-22 13:33:57 -08:00
asus_oled Staging: asus_oled: Fixed use of obsolete function. 2011-11-26 18:13:54 -08:00
bcm Merge branch 'staging-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging 2012-01-09 12:18:17 -08:00
comedi module_param: make bool parameters really bool (drivers & misc) 2012-01-13 09:32:20 +10:30
cptm1217
crystalhd staging: crystalhd: bc_dts_defs.h: Fix up coding style 2011-12-16 10:54:15 -08:00
cxt1e1 Merge branch 'staging-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging 2012-01-09 12:18:17 -08:00
echo
et131x staging: et131x: Revert changes from previous commit 2011-12-08 15:03:11 -08:00
frontier Merge branch 'staging-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging 2012-01-09 12:18:17 -08:00
ft1000 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2012-01-08 13:21:22 -08:00
hv Staging: hv: storvsc: Fix a bug in create_bounce_buffer() 2011-12-08 14:59:47 -08:00
iio Merge branch 'staging-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging 2012-01-09 12:18:17 -08:00
keucr Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2012-01-08 13:21:22 -08:00
line6 staging: line6: fixed ALSA/PCM interaction 2011-12-09 19:26:09 -08:00
media Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media 2012-01-15 12:49:56 -08:00
mei staging/mei: add watchdog device registration wrappers 2011-12-22 13:46:16 -08:00
nvec staging: nvec: add device tree support 2011-11-26 17:17:14 -08:00
octeon MIPS: Octeon: Move some Ethernet support files out of staging. 2011-12-07 22:03:28 +00:00
olpc_dcon Staging: olpc_dcon.c: obsolete use of strict_stroul 2011-12-08 15:01:49 -08:00
omapdrm staging: drm/omap: fix locking issue 2012-02-08 14:14:12 -08:00
panel
phison staging/phison: Convert pci_table entries to PCI_DEVICE (if PCI_ANY_ID is used) 2011-11-28 04:24:32 +09:00
pohmelfs vfs: switch ->show_options() to struct dentry * 2012-01-06 23:19:54 -05:00
quatech_usb2 module_param: make bool parameters really bool (drivers & misc) 2012-01-13 09:32:20 +10:30
quickstart
rtl8187se Merge branch 'staging-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging 2011-10-26 15:39:02 +02:00
rtl8192e staging/rtl8192e: Register against lib80211 2011-12-22 13:48:59 -08:00
rtl8192u Staging: rtl8192u: remove api.c file 2011-11-26 16:25:54 -08:00
rtl8712 Merge branch 'staging-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging 2012-01-09 12:18:17 -08:00
rts5139 Merge branch 'staging-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging 2012-01-09 12:18:17 -08:00
rts_pstor Merge branch 'master' into pm-sleep 2011-12-21 21:59:45 +01:00
sbe-2t3e3
sep Merge branch 'staging-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging 2012-01-09 12:18:17 -08:00
serial m68k/serial: Remove obsolete IRQ_FLG_* users 2011-11-26 16:22:27 -08:00
serqt_usb2 module_param: make bool parameters really bool (drivers & misc) 2012-01-13 09:32:20 +10:30
slicoss staging: slicoss depends on NET 2011-11-18 15:00:48 -08:00
sm7xx staging/sm7xx: Convert pci_table entries to PCI_DEVICE (if PCI_ANY_ID is used) 2011-11-28 04:24:32 +09:00
speakup module_param: make bool parameters really bool (drivers & misc) 2012-01-13 09:32:20 +10:30
ste_rmi4
tidspbridge Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2012-01-08 13:21:22 -08:00
usbip staging: usbip: removed unused definitions from header 2011-12-22 13:40:03 -08:00
vme module_param: make bool parameters really bool (drivers & misc) 2012-01-13 09:32:20 +10:30
vt6655 staging: vt6655: integer overflows in private_ioctl() 2011-11-30 19:29:40 +09:00
vt6656 Merge branch 'staging-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging 2012-01-09 12:18:17 -08:00
winbond USB: convert drivers/staging/* to use module_usb_driver() 2011-11-18 09:42:11 -08:00
wlags49_h2 Merge branch 'staging-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging 2012-01-09 12:18:17 -08:00
wlags49_h25 Staging: wlags49_h25: Makefile: remove unneeded stuff 2011-10-18 13:36:04 -07:00
wlan-ng USB: convert drivers/staging/* to use module_usb_driver() 2011-11-18 09:42:11 -08:00
xgifb staging: xgifb: enable forcecrt2type as a module parameter 2011-12-08 12:26:09 -08:00
zcache zcache: Set SWIZ_BITS to 8 to reduce tmem bucket lock contention. 2012-02-08 14:14:12 -08:00
zram Staging: zram: Add a missing GFP_KERNEL specifier in zram_init_device() 2011-12-08 14:59:48 -08:00
Kconfig staging: delete gma500 driver 2012-02-08 14:14:11 -08:00
Makefile staging: delete gma500 driver 2012-02-08 14:14:11 -08:00
staging.c