[RESEND RFC 0/2] ARM: mm: HugeTLB + THP support for non-LPAE
Steve Capper
steve.capper at linaro.org
Thu Aug 29 05:24:17 EDT 2013
Hello,
I'm resending this series to try and provoke some discussion.
--
The following patches bring both HugeTLB support and Transparent
HugePage (THP) support to ARM for 2 levels of paging (i.e. without
LPAE).
This code has been tested on an Arndale board (Exynos 5250), and
is based on 3.11-rc1, with the hugepage simplification patch:
http://lists.infradead.org/pipermail/linux-arm-kernel/2013-July/184117.html
HugeTLB and THP support for LPAE has already been merged in 3.11-rc1.
Hugepages can give nice performance boosts to workloads that put
pressure on the TLBs. I've observed uplifts of ~5% to some tasks
just by enabling hugepages via the libhugetlbfs tools. Other
people have observed decent performance boosts when huge pages
are enabled:
http://lists.infradead.org/pipermail/linux-arm-kernel/2013-February/148835.html
I would appreciate any discussion on these patches, as there are
people who have an interest in having huge page support in
non-LPAE kernels.
Cheers,
--
Steve
Steve Capper (2):
ARM: mm: HugeTLB support for non-LPAE systems.
ARM: mm: Transparent huge page support for non-LPAE systems.
arch/arm/Kconfig | 4 +-
arch/arm/include/asm/hugetlb-2level.h | 126 +++++++++++++++++++++++++
arch/arm/include/asm/hugetlb.h | 4 +
arch/arm/include/asm/pgtable-2level.h | 170 ++++++++++++++++++++++++++++++++++
arch/arm/include/asm/pgtable-3level.h | 6 ++
arch/arm/include/asm/pgtable.h | 7 +-
arch/arm/include/asm/tlb.h | 10 +-
arch/arm/kernel/head.S | 10 +-
arch/arm/mm/fault.c | 13 ---
arch/arm/mm/fsr-2level.c | 4 +-
arch/arm/mm/hugetlbpage.c | 2 +-
arch/arm/mm/mmu.c | 27 ++++++
12 files changed, 360 insertions(+), 23 deletions(-)
create mode 100644 arch/arm/include/asm/hugetlb-2level.h
--
1.8.1.4
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