arm64: mm: enable per pmd page table lock

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Switch from per mm_struct to per pmd page table lock by enabling
ARCH_ENABLE_SPLIT_PMD_PTLOCK. This provides better granularity for
large system.

I'm not sure if there is contention on mm->page_table_lock. Given
the option comes at no cost (apart from initializing more spin
locks), why not enable it now.

We only do so when pmd is not folded, so we don't mistakenly call
pgtable_pmd_page_ctor() on pud or p4d in pgd_pgtable_alloc().

Signed-off-by: Yu Zhao <yuzhao@google.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

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Yu Zhao 2019-03-11 18:57:49 -06:00 • committed by Will Deacon

parent 14b94d0757

commit 54c8d9119e

3 changed files with 18 additions and 2 deletions

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3

arch/arm64/Kconfig

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12

arch/arm64/include/asm/pgalloc.h

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5

arch/arm64/include/asm/tlb.h

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