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

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Message-Id: <1592226918-26378-1-git-send-email-anshuman.khandual@arm.com>
Date:   Mon, 15 Jun 2020 18:45:16 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     linux-mm@...ck.org, linux-arm-kernel@...ts.infradead.org
Cc:     catalin.marinas@....com, will@...nel.org, mark.rutland@....com,
        ziy@...dia.com, Anshuman Khandual <anshuman.khandual@....com>,
        Marc Zyngier <maz@...nel.org>,
        Suzuki Poulose <suzuki.poulose@....com>,
        linux-kernel@...r.kernel.org
Subject: [RFC 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 v5.8-rc1.

Changes in RFC V2:

- 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 per generic memory semantics
  arm64/mm: Enable THP migration

 arch/arm64/Kconfig               |   4 ++
 arch/arm64/include/asm/pgtable.h | 102 +++++++++++++++++++++++++++----
 arch/arm64/mm/hugetlbpage.c      |   2 +-
 arch/arm64/mm/mmu.c              |  20 ++++++
 4 files changed, 116 insertions(+), 12 deletions(-)

-- 
2.20.1