linux-kernel - [RFC PATCH 0/4] x86_64/mm: remove bottom-up allocation style by pushing forward the parsing of mem hotplug info

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Date:   Mon,  7 Jan 2019 16:24:41 +0800
From:   Pingfan Liu <kernelfans@...il.com>
To:     x86@...nel.org, linux-acpi@...r.kernel.org
Cc:     Pingfan Liu <kernelfans@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>, linux-kernel@...r.kernel.org
Subject: [RFC PATCH 0/4] x86_64/mm: remove bottom-up allocation style by pushing forward the parsing of mem hotplug info 

Background about the defect of the current bottom-up allocation style, take
the following scenario:
  |  unmovable node |     movable node                           |
     | kaslr-kernel |subtree of pgtable for phy<->virt |

Although kaslr-kernel can avoid to stain the movable node. But the
pgtable can still stain the movable node. That is a probability problem,
with low probability, but still exist. This patch tries to eliminate the
probability. With the previous patch, at the point of init_mem_mapping(),
memblock allocator can work with the knowledge of acpi memory hotmovable
info, and avoid to stain the movable node. As a result,
memory_map_bottom_up() is not needed any more.

Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Borislav Petkov <bp@...en8.de>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: Dave Hansen <dave.hansen@...ux.intel.com>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc: Len Brown <lenb@...nel.org>
Cc: linux-kernel@...r.kernel.org

Pingfan Liu (4):
  acpi: change the topo of acpi_table_upgrade()
  x86/setup: parse acpi to get hotplug info before init_mem_mapping()
  x86/mm: set allowed range for memblock allocator
  x86/mm: remove bottom-up allocation style for x86_64

 arch/arm64/kernel/setup.c |   2 +-
 arch/x86/kernel/setup.c   |  17 ++++-
 arch/x86/mm/init.c        | 154 +++++++---------------------------------------
 arch/x86/mm/init_32.c     | 123 ++++++++++++++++++++++++++++++++++++
 arch/x86/mm/mm_internal.h |   7 +++
 drivers/acpi/tables.c     |   4 +-
 include/linux/acpi.h      |   5 +-
 7 files changed, 172 insertions(+), 140 deletions(-)

-- 
2.7.4