linux-kernel - [PATCH v2 0/2] arm64/mm: Enable color zero pages

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Message-Id: <20200923053721.28873-1-gshan@redhat.com>
Date:   Wed, 23 Sep 2020 15:37:19 +1000
From:   Gavin Shan <gshan@...hat.com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, mark.rutland@....com,
        anshuman.khandual@....com, robin.murphy@....com, will@...nel.org,
        catalin.marinas@....com, shan.gavin@...il.com
Subject: [PATCH v2 0/2] arm64/mm: Enable color zero pages

The feature of color zero pages isn't enabled on arm64, meaning all
read-only (anonymous) VM areas are backed up by same zero page. It
leads pressure to L1 (data) cache on reading data from them. This
tries to enable color zero pages.

PATCH[1/2] decouples the zero PGD table from zero page
PATCH[2/2] allocates the needed zero pages according to L1 cache size

Changelog
=========
v2:
   * Rebased to 5.9.rc6                                      (Gavin)
   * Retrieve cache topology from ACPI/DT                    (Will/Robin)

Gavin Shan (2):
  arm64/mm: Introduce zero PGD table
  arm64/mm: Enable color zero pages

 arch/arm64/include/asm/cache.h       |  3 ++
 arch/arm64/include/asm/mmu_context.h |  6 +--
 arch/arm64/include/asm/pgtable.h     | 11 ++++-
 arch/arm64/kernel/cacheinfo.c        | 67 ++++++++++++++++++++++++++++
 arch/arm64/kernel/setup.c            |  2 +-
 arch/arm64/kernel/vmlinux.lds.S      |  4 ++
 arch/arm64/mm/init.c                 | 37 +++++++++++++++
 arch/arm64/mm/mmu.c                  |  7 ---
 arch/arm64/mm/proc.S                 |  2 +-
 drivers/base/cacheinfo.c             |  3 +-
 include/linux/cacheinfo.h            |  6 +++
 11 files changed, 132 insertions(+), 16 deletions(-)

-- 
2.23.0