Messages in this thread | | | From | "Fenghua Yu" <> | Subject | [PATCH 0/9] Optimize string operations by enhanced REP MOVSB/STOSB | Date | Tue, 17 May 2011 15:29:09 -0700 |
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From: Fenghua Yu <fenghua.yu@intel.com>
Intel processors are adding enhancements to REP MOVSB/STOSB and the use of REP MOVSB/STOSB for optimal memcpy/memset or similar functions is recommended. Enhancement availability is indicated by CPUID.7.0.EBX[9] (Enhanced REP MOVSB/STOSB).
Intel 64 and IA-32 SDM and performance optimization guide may include more model specific information and how the feature can be used. The documents will be published soon.
Fenghua Yu (9): x86, cpu: Enable enhanced REP MOVSB/STOSB feature x86/kernel/cpu/intel.c: Initialize Enhanced REP MOVSB/STOSBenhanced x86/kernel/alternative.c: Add comment for applying alternatives order x86, alternative-asm.h: Add altinstruction_entry macro x86/lib/clear_page_64.S: Support clear_page() with enhanced REP MOVSB/STOSB x86/lib/copy_user_64.S: Support copy_to_user/copy_from_user by enhanced REP MOVSB/STOSB x86/lib/memcpy_64.S: Optimize memcpy by enhanced REP MOVSB/STOSB x86/lib/memmove_64.S: Optimize memmove by enhanced REP MOVSB/STOSB x86/lib/memset_64.S: Optimize memset by enhanced REP MOVSB/STOSB
arch/x86/include/asm/alternative-asm.h | 9 ++++ arch/x86/include/asm/cpufeature.h | 1 + arch/x86/kernel/alternative.c | 9 ++++ arch/x86/kernel/cpu/intel.c | 19 +++++++-- arch/x86/lib/clear_page_64.S | 33 ++++++++++++---- arch/x86/lib/copy_user_64.S | 65 +++++++++++++++++++++++++++----- arch/x86/lib/memcpy_64.S | 45 ++++++++++++++++------ arch/x86/lib/memmove_64.S | 29 ++++++++++++++- arch/x86/lib/memset_64.S | 54 ++++++++++++++++++++------ 9 files changed, 215 insertions(+), 49 deletions(-)
-- 1.7.2
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