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* [PATCH 0/2] Create 'old' ptes for faultaround mappings on arm64 with hardware access flag
@ 2020-12-09 16:39 ` Will Deacon
  0 siblings, 0 replies; 138+ messages in thread
From: Will Deacon @ 2020-12-09 16:39 UTC (permalink / raw)
  To: linux-kernel
  Cc: linux-mm, linux-arm-kernel, Will Deacon, Catalin Marinas,
	Jan Kara, Minchan Kim, Andrew Morton, Kirill A . Shutemov,
	Linus Torvalds, Vinayak Menon, kernel-team

Hi folks,

This series allows architectures to opt-in at runtime for faultaround
mappings to be created as 'old' instead of 'young'. Although there have
been previous attempts at this, they failed either because the decision
was deferred to userspace [1] or because it was done unconditionally and
shown to regress benchmarks for particular architectures [2].

Since this patch has demonstrated considerable benefits for arm64-based
Android devices with hardware access flag capabilities, patch two enables
this functionality there.

Cheers,

Will

[1] https://www.spinics.net/lists/linux-mm/msg143831.html
[2] 315d09bf30c2 ("Revert "mm: make faultaround produce old ptes"")

Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Vinayak Menon <vinmenon@codeaurora.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: <kernel-team@android.com>

--->8

Will Deacon (2):
  mm: Allow architectures to request 'old' entries when prefaulting
  arm64: mm: Implement arch_wants_old_faultaround_pte()

 arch/arm64/include/asm/cpufeature.h | 12 +++++++++++
 arch/arm64/include/asm/pgtable.h    |  8 +++++++-
 include/linux/mm.h                  |  5 ++++-
 mm/memory.c                         | 31 ++++++++++++++++++++++++++---
 4 files changed, 51 insertions(+), 5 deletions(-)

-- 
2.29.2.576.ga3fc446d84-goog


^ permalink raw reply	[flat|nested] 138+ messages in thread

end of thread, other threads:[~2020-12-29 20:54 UTC | newest]

Thread overview: 138+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-12-09 16:39 [PATCH 0/2] Create 'old' ptes for faultaround mappings on arm64 with hardware access flag Will Deacon
2020-12-09 16:39 ` Will Deacon
2020-12-09 16:39 ` [PATCH 1/2] mm: Allow architectures to request 'old' entries when prefaulting Will Deacon
2020-12-09 16:39   ` Will Deacon
2020-12-09 17:58   ` Linus Torvalds
2020-12-09 17:58     ` Linus Torvalds
2020-12-09 17:58     ` Linus Torvalds
2020-12-09 18:40     ` Will Deacon
2020-12-09 18:40       ` Will Deacon
2020-12-09 19:04       ` Linus Torvalds
2020-12-09 19:04         ` Linus Torvalds
2020-12-09 19:04         ` Linus Torvalds
2020-12-09 20:32         ` Matthew Wilcox
2020-12-09 20:32           ` Matthew Wilcox
2020-12-09 21:04           ` Linus Torvalds
2020-12-09 21:04             ` Linus Torvalds
2020-12-09 21:04             ` Linus Torvalds
2020-12-10 15:08         ` Kirill A. Shutemov
2020-12-10 15:08           ` Kirill A. Shutemov
2020-12-10 17:23           ` Linus Torvalds
2020-12-10 17:23             ` Linus Torvalds
2020-12-10 17:23             ` Linus Torvalds
2020-12-14 16:07             ` Kirill A. Shutemov
2020-12-14 16:07               ` Kirill A. Shutemov
2020-12-14 17:54               ` Linus Torvalds
2020-12-14 17:54                 ` Linus Torvalds
2020-12-14 17:54                 ` Linus Torvalds
2020-12-14 18:56                 ` Matthew Wilcox
2020-12-14 18:56                   ` Matthew Wilcox
2020-12-16 17:07                 ` Kirill A. Shutemov
2020-12-16 17:07                   ` Kirill A. Shutemov
2020-12-16 18:41                   ` Linus Torvalds
2020-12-16 18:41                     ` Linus Torvalds
2020-12-16 18:41                     ` Linus Torvalds
2020-12-17 10:54                     ` Kirill A. Shutemov
2020-12-17 10:54                       ` Kirill A. Shutemov
2020-12-17 18:22                       ` Linus Torvalds
2020-12-17 18:22                         ` Linus Torvalds
2020-12-17 18:22                         ` Linus Torvalds
2020-12-18 11:04                         ` Kirill A. Shutemov
2020-12-18 11:04                           ` Kirill A. Shutemov
2020-12-18 18:56                           ` Linus Torvalds
2020-12-18 18:56                             ` Linus Torvalds
2020-12-18 18:56                             ` Linus Torvalds
2020-12-19 12:41                             ` Kirill A. Shutemov
2020-12-19 12:41                               ` Kirill A. Shutemov
2020-12-19 20:08                               ` Linus Torvalds
2020-12-19 20:08                                 ` Linus Torvalds
2020-12-19 20:08                                 ` Linus Torvalds
2020-12-19 20:34                               ` Linus Torvalds
2020-12-19 20:34                                 ` Linus Torvalds
2020-12-19 20:34                                 ` Linus Torvalds
2020-12-22 10:00                                 ` Kirill A. Shutemov
2020-12-22 10:00                                   ` Kirill A. Shutemov
2020-12-24  4:04                                   ` Hugh Dickins
2020-12-24  4:04                                     ` Hugh Dickins
2020-12-24  4:04                                     ` Hugh Dickins
2020-12-25 11:31                                     ` Kirill A. Shutemov
2020-12-25 11:31                                       ` Kirill A. Shutemov
2020-12-26 17:57                                       ` Linus Torvalds
2020-12-26 17:57                                         ` Linus Torvalds
2020-12-26 17:57                                         ` Linus Torvalds
2020-12-26 20:43                                         ` Kirill A. Shutemov
2020-12-26 20:43                                           ` Kirill A. Shutemov
2020-12-26 21:03                                           ` Hugh Dickins
2020-12-26 21:03                                             ` Hugh Dickins
2020-12-26 21:03                                             ` Hugh Dickins
2020-12-26 21:16                                             ` Linus Torvalds
2020-12-26 21:16                                               ` Linus Torvalds
2020-12-26 21:16                                               ` Linus Torvalds
2020-12-26 22:40                                               ` Kirill A. Shutemov
2020-12-26 22:40                                                 ` Kirill A. Shutemov
2020-12-27  0:45                                                 ` Hugh Dickins
2020-12-27  0:45                                                   ` Hugh Dickins
2020-12-27  0:45                                                   ` Hugh Dickins
2020-12-27  2:38                                                   ` Hugh Dickins
2020-12-27  2:38                                                     ` Hugh Dickins
2020-12-27  2:38                                                     ` Hugh Dickins
2020-12-27 19:38                                                     ` Linus Torvalds
2020-12-27 19:38                                                       ` Linus Torvalds
2020-12-27 19:38                                                       ` Linus Torvalds
2020-12-27 20:32                                                       ` Damian Tometzki
2020-12-27 20:32                                                         ` Damian Tometzki
2020-12-27 22:35                                                         ` Hugh Dickins
2020-12-27 22:35                                                           ` Hugh Dickins
2020-12-27 22:35                                                           ` Hugh Dickins
2020-12-27 23:12                                                           ` Linus Torvalds
2020-12-27 23:12                                                             ` Linus Torvalds
2020-12-27 23:12                                                             ` Linus Torvalds
2020-12-27 23:40                                                             ` Linus Torvalds
2020-12-27 23:40                                                               ` Linus Torvalds
2020-12-27 23:40                                                               ` Linus Torvalds
2020-12-27 23:55                                                               ` Kirill A. Shutemov
2020-12-27 23:55                                                                 ` Kirill A. Shutemov
2020-12-27 23:48                                                       ` Kirill A. Shutemov
2020-12-27 23:48                                                         ` Kirill A. Shutemov
2020-12-28  1:54                                                         ` Linus Torvalds
2020-12-28  1:54                                                           ` Linus Torvalds
2020-12-28  1:54                                                           ` Linus Torvalds
2020-12-28  6:43                                                           ` Hugh Dickins
2020-12-28  6:43                                                             ` Hugh Dickins
2020-12-28  6:43                                                             ` Hugh Dickins
2020-12-28 12:53                                                             ` Kirill A. Shutemov
2020-12-28 12:53                                                               ` Kirill A. Shutemov
2020-12-28 18:47                                                               ` Linus Torvalds
2020-12-28 18:47                                                                 ` Linus Torvalds
2020-12-28 18:47                                                                 ` Linus Torvalds
2020-12-28 21:58                                                                 ` Linus Torvalds
2020-12-28 21:58                                                                   ` Linus Torvalds
2020-12-28 21:58                                                                   ` Linus Torvalds
2020-12-29 13:28                                                                   ` Kirill A. Shutemov
2020-12-29 13:28                                                                     ` Kirill A. Shutemov
2020-12-29 15:19                                                                     ` Matthew Wilcox
2020-12-29 15:19                                                                       ` Matthew Wilcox
2020-12-29 20:52                                                                     ` Linus Torvalds
2020-12-29 20:52                                                                       ` Linus Torvalds
2020-12-29 20:52                                                                       ` Linus Torvalds
2020-12-28 22:05                                                                 ` Kirill A. Shutemov
2020-12-28 22:05                                                                   ` Kirill A. Shutemov
2020-12-28 22:12                                                                   ` Kirill A. Shutemov
2020-12-28 22:12                                                                     ` Kirill A. Shutemov
2020-12-29  4:35                                                                     ` Hugh Dickins
2020-12-29  4:35                                                                       ` Hugh Dickins
2020-12-29  4:35                                                                       ` Hugh Dickins
2020-12-28 23:28                                                                   ` Linus Torvalds
2020-12-28 23:28                                                                     ` Linus Torvalds
2020-12-28 23:28                                                                     ` Linus Torvalds
2020-12-26 21:07                                           ` Linus Torvalds
2020-12-26 21:07                                             ` Linus Torvalds
2020-12-26 21:07                                             ` Linus Torvalds
2020-12-26 21:41                                           ` Matthew Wilcox
2020-12-26 21:41                                             ` Matthew Wilcox
2020-12-09 16:39 ` [PATCH 2/2] arm64: mm: Implement arch_wants_old_faultaround_pte() Will Deacon
2020-12-09 16:39   ` Will Deacon
2020-12-09 18:35   ` Catalin Marinas
2020-12-09 18:35     ` Catalin Marinas
2020-12-09 18:46     ` Will Deacon
2020-12-09 18:46       ` Will Deacon

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