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| author | Yu Zhao | 2019-03-12 01:57:49 +0100 |
|---|---|---|
| committer | Will Deacon | 2019-04-09 12:21:50 +0200 |
| commit | 54c8d9119ec85de48fd0707946a5e57df9ad7acf (patch) | |
| tree | bb63c0e6365016782e0d0646a6ad9e004ed88fc5 /arch/arm64/Kconfig | |
| parent | KVM: ARM: Remove pgtable page standard functions from stage-2 page tables (diff) | |
| download | kernel-qcow2-linux-54c8d9119ec85de48fd0707946a5e57df9ad7acf.tar.gz kernel-qcow2-linux-54c8d9119ec85de48fd0707946a5e57df9ad7acf.tar.xz kernel-qcow2-linux-54c8d9119ec85de48fd0707946a5e57df9ad7acf.zip | |
arm64: mm: enable per pmd page table lock
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>
Diffstat (limited to 'arch/arm64/Kconfig')
| -rw-r--r-- | arch/arm64/Kconfig | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 7e34b9eba5de..555af5035592 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -889,6 +889,9 @@ config ARCH_WANT_HUGE_PMD_SHARE config ARCH_HAS_CACHE_LINE_SIZE def_bool y +config ARCH_ENABLE_SPLIT_PMD_PTLOCK + def_bool y if PGTABLE_LEVELS > 2 + config SECCOMP bool "Enable seccomp to safely compute untrusted bytecode" ---help--- |