linux-kernel - [PATCH V2 0/2] arm64/mm: Enable THP migration

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Date:   Wed,  9 Sep 2020 10:23:01 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     linux-mm@...ck.org, linux-arm-kernel@...ts.infradead.org
Cc:     will@...nel.org, catalin.marinas@....com,
        akpm@...ux-foundation.org, rcampbell@...dia.com, ziy@...dia.com,
        Jonathan.Cameron@...wei.com,
        Anshuman Khandual <anshuman.khandual@....com>,
        Mark Rutland <mark.rutland@....com>,
        Marc Zyngier <maz@...nel.org>,
        Suzuki Poulose <suzuki.poulose@....com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH V2 0/2] arm64/mm: Enable THP migration

This series enables THP migration on arm64 via ARCH_ENABLE_THP_MIGRATION.
But first this modifies all existing THP helpers like pmd_present() and
pmd_trans_huge() etc per expected generic memory semantics as concluded
from a previous discussion here.

https://lkml.org/lkml/2018/10/9/220

This series is based on v5.9-rc4.

Changes in V2:

- Renamed clr_pmd_bit() as clear_pmd_bit() per Catalin
- Updated in-code documentation per Catalin and Ralph
- Updated commit message in the first patch per Catalin
- Updated commit message in the second patch per Catalin
- Added tags from Catalin

Changes in V1: (https://patchwork.kernel.org/project/linux-mm/list/?series=333627)

- Used new PMD_PRESENT_INVALID (bit 59) to represent invalidated PMD state per Catalin

Changes in RFC V2: (https://patchwork.kernel.org/project/linux-mm/list/?series=302965)

- Used PMD_TABLE_BIT to represent splitting PMD state per Catalin

Changes in RFC V1: (https://patchwork.kernel.org/project/linux-mm/list/?series=138797)

Cc: Catalin Marinas <catalin.marinas@....com>
Cc: Will Deacon <will@...nel.org>
Cc: Mark Rutland <mark.rutland@....com>
Cc: Marc Zyngier <maz@...nel.org>
Cc: Suzuki Poulose <suzuki.poulose@....com>
Cc: Zi Yan <ziy@...dia.com>
Cc: linux-arm-kernel@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org

Anshuman Khandual (2):
  arm64/mm: Change THP helpers to comply with generic MM semantics
  arm64/mm: Enable THP migration

 arch/arm64/Kconfig                    |  4 +++
 arch/arm64/include/asm/pgtable-prot.h |  7 +++++
 arch/arm64/include/asm/pgtable.h      | 39 ++++++++++++++++++++++++---
 3 files changed, 47 insertions(+), 3 deletions(-)

-- 
2.20.1