Commit e0533dee authored by Bailu Lin's avatar Bailu Lin Committed by Jonathan Corbet
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Documentation: Chinese translation of Documentation/arm64/hugetlbpage.rst



This is a Chinese translated version of
 Documentation/arm64/hugetlbpage.rst

Signed-off-by: default avatarBailu Lin <bailu.lin@vivo.com>
Reviewed-by: default avatarAlex Shi <alex.shi@linux.alibaba.com>
Link: https://lore.kernel.org/r/20201014022003.43862-1-bailu.lin@vivo.com


Signed-off-by: default avatarJonathan Corbet <corbet@lwn.net>
parent d7a4c55b
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.. _hugetlbpage_index:

====================
HugeTLBpage on ARM64
====================
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.. include:: ../disclaimer-zh_CN.rst

:Original: :ref:`Documentation/arm64/hugetlbpage.rst <hugetlbpage_index>`

Translator: Bailu Lin <bailu.lin@vivo.com>

=====================
ARM64中的 HugeTLBpage
=====================

大页依靠有效利用 TLBs 来提高地址翻译的性能。这取决于以下
两点 -

  - 大页的大小
  - TLBs 支持的条目大小

ARM64 接口支持2种大页方式。

1) pud/pmd 级别的块映射
-----------------------

这是常规大页,他们的 pmd 或 pud 页面表条目指向一个内存块。
不管 TLB 中支持的条目大小如何,块映射可以减少翻译大页地址
所需遍历的页表深度。

2) 使用连续位
-------------

架构中转换页表条目(D4.5.3, ARM DDI 0487C.a)中提供一个连续
位告诉 MMU 这个条目是一个连续条目集的一员,它可以被缓存在单
个 TLB 条目中。

在 Linux 中连续位用来增加 pmd 和 pte(最后一级)级别映射的大
小。受支持的连续页表条目数量因页面大小和页表级别而异。


支持以下大页尺寸配置 -

  ====== ========   ====    ========    ===
  -      CONT PTE    PMD    CONT PMD    PUD
  ====== ========   ====    ========    ===
  4K:         64K     2M         32M     1G
  16K:         2M    32M          1G
  64K:         2M   512M         16G
  ====== ========   ====    ========    ===
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@@ -14,3 +14,4 @@ ARM64 架构
    :maxdepth: 2

    amu
    hugetlbpage