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    Subject[PATCH 0/9] Optimize string operations by enhanced REP MOVSB/STOSB
    Date
    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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