AcoSail/kernel_optimize_test
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c626e3f5ca
kernel_optimize_test/arch/arm
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Nicolas Pitre c626e3f5ca [ARM] alternative copy_to_user: more precise fallback threshold 
Previous size thresholds were guessed from various user space benchmarks
using a kernel with and without the alternative uaccess option.  This
is however not as precise as a kernel based test to measure the real
speed of each method.

This adds a simple test bench to show the time needed for each method.
With this, the optimal size treshold for the alternative implementation
can be determined with more confidence.  It appears that the optimal
threshold for both copy_to_user and clear_user is around 64 bytes. This
is not a surprise knowing that the memcpy and memset implementations
need at least 64 bytes to achieve maximum throughput.

One might suggest that such test be used to determine the optimal
threshold at run time instead, but results are near enough to 64 on
tested targets concerned by this alternative copy_to_user implementation,
so adding some overhead associated with a variable threshold is probably
not worth it for now.

Signed-off-by: Nicolas Pitre <nico@marvell.com>
2009-05-30 01:10:15 -04:00
..
boot arm: allow usage of string functions in linux/string.h 2009-03-31 13:05:36 +10:30
common [ARM] smp: fix cpumask usage in ARM SMP code 2009-05-17 16:22:46 +01:00
configs Merge branch 'for-rmk' of git://git.pengutronix.de/git/imx/linux-2.6 2009-05-05 09:22:26 +01:00
include/asm [ARM] allow for alternative __copy_to_user/__clear_user implementations 2009-05-29 22:34:45 -04:00
kernel [ARM] smp: fix cpumask usage in ARM SMP code 2009-05-17 16:22:46 +01:00
lib [ARM] alternative copy_to_user: more precise fallback threshold 2009-05-30 01:10:15 -04:00
mach-aaec2000 [ARM] pass reboot command line to arch_reset() 2009-03-19 16:20:24 +00:00
mach-at91 clocksource: pass clocksource to read() callback 2009-04-21 13:41:47 -07:00
mach-clps711x [ARM] pass reboot command line to arch_reset() 2009-03-19 16:20:24 +00:00
mach-davinci Merge branch 'fix/asoc' into for-linus 2009-05-15 15:38:26 +02:00
mach-ebsa110 [ARM] pass reboot command line to arch_reset() 2009-03-19 16:20:24 +00:00
mach-ep93xx [ARM] 5509/1: ep93xx: clkdev enable UARTS 2009-05-16 19:55:56 +01:00
mach-footbridge [ARM] pass reboot command line to arch_reset() 2009-03-19 16:20:24 +00:00
mach-gemini [ARM] arch_reset() now takes a second parameter 2009-03-30 10:40:12 +01:00
mach-h720x [ARM] pass reboot command line to arch_reset() 2009-03-19 16:20:24 +00:00
mach-imx Merge master.kernel.org:/home/rmk/linux-2.6-arm 2009-04-24 08:36:41 -07:00
mach-integrator [ARM] 5517/1: integrator: don't put clock lookups in __initdata 2009-05-18 17:43:16 +01:00
mach-iop13xx dma-mapping: replace all DMA_64BIT_MASK macro with DMA_BIT_MASK(64) 2009-04-07 08:31:10 -07:00
mach-iop32x [ARM] pass reboot command line to arch_reset() 2009-03-19 16:20:24 +00:00
mach-iop33x [ARM] pass reboot command line to arch_reset() 2009-03-19 16:20:24 +00:00
mach-ixp4xx Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6 2009-05-10 10:46:45 -07:00
mach-ixp23xx [ARM] pass reboot command line to arch_reset() 2009-03-19 16:20:24 +00:00
mach-ixp2000 [ARM] pass reboot command line to arch_reset() 2009-03-19 16:20:24 +00:00
mach-kirkwood [ARM] 5460/1: Orion: reduce namespace pollution 2009-04-23 23:25:41 +01:00
mach-ks8695 Merge branch 'highmem' into devel 2009-03-24 22:47:45 +00:00
mach-l7200 [ARM] mach-l7200: fix spelling of SYS_CLOCK_OFF 2009-05-18 11:25:08 +01:00
mach-lh7a40x [ARM] pass reboot command line to arch_reset() 2009-03-19 16:20:24 +00:00
mach-loki [ARM] 5460/1: Orion: reduce namespace pollution 2009-04-23 23:25:41 +01:00
mach-mmp [ARM] arch_reset() now takes a second parameter 2009-03-30 10:40:12 +01:00
mach-msm clocksource: pass clocksource to read() callback 2009-04-21 13:41:47 -07:00
mach-mv78xx0 [ARM] 5460/1: Orion: reduce namespace pollution 2009-04-23 23:25:41 +01:00
mach-mx1 MX1ADS: remove I2C ifdefs 2009-04-16 12:57:15 +02:00
mach-mx2 imx21: activate i2c 2009-04-16 12:57:13 +02:00
mach-mx3 mx31ads: Mark as having full regulatoion constraints with 1133-EV1 board 2009-04-16 13:03:56 +02:00
mach-netx clocksource: pass clocksource to read() callback 2009-04-21 13:41:47 -07:00
mach-ns9xxx clocksource: pass clocksource to read() callback 2009-04-21 13:41:47 -07:00
mach-omap1 Merge branch 'omap-clock-fixes' into omap-fixes 2009-04-24 09:56:16 -07:00
mach-omap2 ARM: OMAP2/3: Change omapfb to use clkdev for dispc and rfbi, v2 2009-05-16 08:28:17 -07:00
mach-orion5x [ARM] 5460/1: Orion: reduce namespace pollution 2009-04-23 23:25:41 +01:00
mach-pnx4008 [ARM] pass reboot command line to arch_reset() 2009-03-19 16:20:24 +00:00
mach-pxa [ARM] 5513/1: Eurotech VIPER SBC: fix compilation error 2009-05-16 19:55:56 +01:00
mach-realview [ARM] realview: fix broadcast tick support 2009-05-17 17:11:35 +01:00
mach-rpc [ARM] pass reboot command line to arch_reset() 2009-03-19 16:20:24 +00:00
mach-s3c24a0/include/mach [ARM] S3C: Make IRQ_EINT sleep control common 2009-03-08 12:35:36 +00:00
mach-s3c2400 [ARM] remove a common set of __virt_to_bus definitions 2008-11-28 15:36:49 +00:00
mach-s3c2410 [ARM] S3C2410: mach-bast.c registering i2c data too early 2009-05-15 15:13:25 +01:00
mach-s3c2412 [ARM] S3C2412: Add missing cache flush in suspend code 2009-05-01 12:28:16 +01:00
mach-s3c2440 [ARM] Osiris: Fix double initialisation in machine block 2009-04-17 12:42:24 +01:00
mach-s3c2442 [ARM] Arrange for platforms to select appropriate CPU support 2008-11-27 12:38:00 +00:00
mach-s3c2443 S3C24XX: Move and update IIS headers 2009-03-05 12:00:59 +00:00
mach-s3c6400 [ARM] S3C64XX: Add S3C64XX_PA_IIS{0,1} to <mach/map.h> 2009-05-01 12:28:16 +01:00
mach-s3c6410 [ARM] SMDK6410: Request GPIOs for LCD power control 2009-04-15 14:46:03 +01:00
mach-sa1100 [ARM] lart: fix build error 2009-04-26 13:56:01 +01:00
mach-shark [ARM] pass reboot command line to arch_reset() 2009-03-19 16:20:24 +00:00
mach-versatile [ARM] 5518/1: versatile: don't put clock lookups in __initdata 2009-05-18 17:43:06 +01:00
mach-w90x900 [ARM] pass reboot command line to arch_reset() 2009-03-19 16:20:24 +00:00
mm Merge master.kernel.org:/home/rmk/linux-2.6-arm 2009-05-02 16:40:20 -07:00
nwfpe [ARM] nwfpe: fix 'floatx80_is_nan' sparse warning 2009-05-15 12:49:14 +01:00
oprofile Merge branch 'devel' of master.kernel.org:/home/rmk/linux-2.6-arm 2009-03-28 14:03:14 -07:00
plat-iop dma-mapping: replace all DMA_32BIT_MASK macro with DMA_BIT_MASK(32) 2009-04-07 08:31:11 -07:00
plat-mxc mx27ads: move PBC mapping out of vmalloc space 2009-05-05 09:37:08 +02:00
plat-omap ARM: OMAP3: Fix number of GPIO lines for 34xx 2009-05-16 08:28:16 -07:00
plat-orion Merge master.kernel.org:/home/rmk/linux-2.6-arm 2009-04-24 08:36:41 -07:00
plat-pxa [ARM] pxa: fix issue of muxed GPIO irq_chip functions touching non-muxed GPIOs 2009-04-27 11:45:16 +08:00
plat-s3c [ARM] S3C: Do not set clk->owner field if unset 2009-05-15 15:21:57 +01:00
plat-s3c24xx [ARM] S3C24XX: Fix unused code warning in arch/arm/plat-s3c24xx/dma.c 2009-05-15 15:13:24 +01:00
plat-s3c64xx [ARM] S3C64XX: fix GPIO debug 2009-05-15 15:13:18 +01:00
tools [ARM] update mach-types 2009-03-23 16:12:37 -04:00
vfp [ARM] 5440/1: Fix VFP state corruption due to preemption during VFP exceptions 2009-04-01 22:17:50 +01:00
Kconfig [ARM] alternative copy_to_user/clear_user implementation 2009-05-29 22:36:45 -04:00
Kconfig-nommu
Kconfig.debug [ARM] 5412/1: XSCALE: add ice dcc support 2009-02-27 20:57:46 +00:00
Makefile Merge branch 'for-rmk' of git://gitorious.org/linux-gemini/mainline into devel 2009-03-26 23:10:11 +00:00