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cf8fb5533f
linux/arch/powerpc/lib
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Anton Blanchard cf8fb5533f powerpc: Optimise the 64bit optimised __clear_user 
I blame Mikey for this. He elevated my slightly dubious testcase:

to benchmark status. And naturally we need to be number 1 at creating
zeros. So lets improve __clear_user some more.

As Paul suggests we can use dcbz for large lengths. This patch gets
the destination cacheline aligned then uses dcbz on whole cachelines.

Before:
10485760000 bytes (10 GB) copied, 0.414744 s, 25.3 GB/s

After:
10485760000 bytes (10 GB) copied, 0.268597 s, 39.0 GB/s

39 GB/s, a new record.

Signed-off-by: Anton Blanchard <anton@samba.org>
Tested-by: Olof Johansson <olof@lixom.net>
Acked-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2012-07-03 14:14:48 +10:00
..
alloc.c Disintegrate asm/system.h for PowerPC 2012-03-28 18:30:02 +01:00
checksum_32.S powerpc: Rename files to have consistent _32/_64 suffixes 2005-10-10 21:52:43 +10:00
checksum_64.S powerpc: Optimise 64bit csum_partial_copy_generic and add csum_and_copy_from_user 2010-09-02 14:07:30 +10:00
checksum_wrappers_64.c powerpc: various straight conversions from module.h --> export.h 2011-10-31 19:30:44 -04:00
code-patching.c powerpc: Have patch_instruction detect faults 2012-07-03 14:14:38 +10:00
copy_32.S powerpc: Fix incorrect .stabs entry for copy_32.S 2010-09-02 14:07:34 +10:00
copypage_64.S powerpc: POWER7 optimised copy_page using VMX and enhanced prefetch 2012-07-03 14:14:44 +10:00
copypage_power7.S powerpc: POWER7 optimised copy_page using VMX and enhanced prefetch 2012-07-03 14:14:44 +10:00
copyuser_64.S powerpc: Remove CONFIG_POWER4_ONLY 2012-04-30 15:37:26 +10:00
copyuser_power7.S powerpc: Use enhanced touch instructions in POWER7 copy_to_user/copy_from_user 2012-07-03 14:14:45 +10:00
crtsavres.S powerpc: Fix module building for gcc 4.5 and 64 bit 2010-07-08 18:11:38 +10:00
devres.c powerpc: various straight conversions from module.h --> export.h 2011-10-31 19:30:44 -04:00
div64.S powerpc: Fix a corner case in __div64_32 2005-10-20 09:37:02 +10:00
feature-fixups-test.S powerpc: Ensure the else case of feature sections will fit 2011-01-21 14:08:33 +11:00
feature-fixups.c powerpc: Copy down exception vectors after feature fixups 2011-11-16 14:47:54 +11:00
hweight_64.S powerpc: Hardcode popcnt instructions for old assemblers 2010-12-09 15:35:30 +11:00
ldstfp.S powerpc: mtmsrd not defined 2010-09-02 14:07:34 +10:00
locks.c powerpc: Remove FW_FEATURE ISERIES from arch code 2012-03-21 11:16:11 +11:00
Makefile powerpc: POWER7 optimised memcpy using VMX and enhanced prefetch 2012-07-03 14:14:46 +10:00
mem_64.S powerpc: Remove CONFIG_POWER4_ONLY 2012-04-30 15:37:26 +10:00
memcpy_64.S powerpc: POWER7 optimised memcpy using VMX and enhanced prefetch 2012-07-03 14:14:46 +10:00
memcpy_power7.S powerpc: POWER7 optimised memcpy using VMX and enhanced prefetch 2012-07-03 14:14:46 +10:00
rheap.c powerpc: various straight conversions from module.h --> export.h 2011-10-31 19:30:44 -04:00
sstep.c Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2011-05-20 13:28:01 -07:00
string_64.S powerpc: Optimise the 64bit optimised __clear_user 2012-07-03 14:14:48 +10:00
string.S powerpc: 64bit optimised __clear_user 2012-07-03 14:14:41 +10:00
usercopy_64.c powerpc: Rename files to have consistent _32/_64 suffixes 2005-10-10 21:52:43 +10:00
vmx-helper.c powerpc: POWER7 optimised copy_page using VMX and enhanced prefetch 2012-07-03 14:14:44 +10:00