From: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx> Here's alternative implementation of huge zero page: virtual huge zero page. Virtual huge zero page is a PMD table with all entries set to zero page. H. Peter Anvin asked to evaluate this implementation option. Pros: - cache friendly (not yet benchmarked); - less changes required (if I haven't miss something ;); Cons: - increases TLB pressure; - requires per-arch enabling; - one more check on handle_mm_fault() path. At the moment I did only sanity check. Testing is required. Any opinion? Kirill A. Shutemov (3): asm-generic: introduce pmd_special() and pmd_mkspecial() mm, thp: implement virtual huge zero page x86: implement HAVE_PMD_SPECAIL arch/Kconfig | 6 ++++++ arch/x86/Kconfig | 1 + arch/x86/include/asm/pgtable.h | 14 +++++++++++++- include/asm-generic/pgtable.h | 12 ++++++++++++ include/linux/mm.h | 8 ++++++++ mm/huge_memory.c | 38 ++++++++++++++++++++++++++++++++++++++ mm/memory.c | 15 ++++++++------- 7 files changed, 86 insertions(+), 8 deletions(-) -- 1.7.7.6 -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
