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    Subject[PATCH, RFC 0/6] Avoid cache trashing on clearing huge/gigantic page
    Date
    From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>

    Clearing a 2MB huge page will typically blow away several levels of CPU
    caches. To avoid this only cache clear the 4K area around the fault
    address and use a cache avoiding clears for the rest of the 2MB area.

    It would be nice to test the patchset with more workloads. Especially if
    you see performance regression with THP.

    Any feedback is appreciated.

    Andi Kleen (6):
    THP: Use real address for NUMA policy
    mm: make clear_huge_page tolerate non aligned address
    THP: Pass real, not rounded, address to clear_huge_page
    x86: Add clear_page_nocache
    mm: make clear_huge_page cache clear only around the fault address
    x86: switch the 64bit uncached page clear to SSE/AVX v2

    arch/x86/include/asm/page.h | 2 +
    arch/x86/include/asm/string_32.h | 5 ++
    arch/x86/include/asm/string_64.h | 5 ++
    arch/x86/lib/Makefile | 1 +
    arch/x86/lib/clear_page_nocache_32.S | 30 +++++++++++
    arch/x86/lib/clear_page_nocache_64.S | 92 ++++++++++++++++++++++++++++++++++
    arch/x86/mm/fault.c | 7 +++
    mm/huge_memory.c | 17 +++---
    mm/memory.c | 29 ++++++++++-
    9 files changed, 178 insertions(+), 10 deletions(-)
    create mode 100644 arch/x86/lib/clear_page_nocache_32.S
    create mode 100644 arch/x86/lib/clear_page_nocache_64.S

    --
    1.7.7.6



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