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From: Miles Chen <miles.chen@mediatek.com>
To: Catalin Marinas <catalin.marinas@arm.com>,
	Russell King <linux@armlinux.org.uk>,
	Minchan Kim <minchan@kernel.org>
Cc: linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org, wsd_upstream@mediatek.com
Subject: [PATCH v2 0/4] arm: support get_user_pages_fast
Date: Fri, 23 Oct 2020 17:14:33 +0800	[thread overview]
Message-ID: <20201023091437.8225-1-miles.chen@mediatek.com> (raw)

get_user_pages_fast helps app's launching time because it could reduce
mmap_sem lock contentions when app is launching.

Minchan posted a RFC patch and patch v1 [1] in 2018 and currently he has no
bandwidth to rework this patch, so I rebase Minchan's patch
(arm: support get_user_pages_fast) and modify the patch according
to Catalin's comment and re-post this patch.

First, to use generic get_user_pages_fast code, use strict mm type in
pgtable-2level-types.

2nd patch: reorder memory type table to use 5th bit of the page table

3rd patch: introduces L_PTE_SPECIAL for arm so that last patch can
support get_user_pags_fast.

4th patch: remove L_PTE_MT_VECTORS and use read-only type.


[1] https://lore.kernel.org/patchwork/cover/986573/

Change since v1:
* modify comment
* remove L_PTE_MT_VECTORS and use read-only type 

Change since RFC:
* Remove CPU_v7M - Catalin
* define DEV_NONSHARED to SHARED - Catalin
* https://lkml.kernel.org/r/20180910165011.zcighyuabshsmxjb@armageddon.cambridge.arm.com


Miles Chen (2):
  arm: mm: use strict p[gum]d types
  arm: replace vector mem type with read-only type

Minchan Kim (2):
  arm: mm: reordering memory type table
  arm: mm: introduce L_PTE_SPECIAL

 arch/arm/Kconfig                            |  4 ++--
 arch/arm/include/asm/fixmap.h               |  6 ++---
 arch/arm/include/asm/pgtable-2level-types.h | 26 ---------------------
 arch/arm/include/asm/pgtable-2level.h       | 22 +++++++++++++----
 arch/arm/include/asm/pgtable-3level.h       |  6 -----
 arch/arm/include/asm/pgtable.h              | 13 +++++++++++
 arch/arm/mm/mmu.c                           |  7 +++---
 arch/arm/mm/proc-macros.S                   |  2 +-
 8 files changed, 40 insertions(+), 46 deletions(-)

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             reply	other threads:[~2020-10-23  9:28 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-23  9:14 Miles Chen [this message]
2020-10-23  9:14 ` [PATCH v2 1/4] arm: mm: use strict p[gum]d types Miles Chen
2020-10-23  9:14 ` [PATCH v2 2/4] arm: mm: reordering memory type table Miles Chen
2020-10-23 10:16   ` Russell King - ARM Linux admin
2020-10-27  8:03     ` Miles Chen
2020-10-23  9:14 ` [PATCH v2 3/4] arm: mm: introduce L_PTE_SPECIAL Miles Chen
2020-10-23 10:08   ` Russell King - ARM Linux admin
2020-10-27  7:45     ` Miles Chen
2020-10-27  9:11       ` Russell King - ARM Linux admin
2020-11-01 12:48         ` Miles Chen
2020-10-23  9:14 ` [PATCH v2 4/4] arm: replace vector mem type with read-only type Miles Chen
2020-10-23 10:12   ` Russell King - ARM Linux admin
2020-10-27  7:41     ` Miles Chen

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