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Message-Id: <20210108171517.5290-1-will@kernel.org>
Date: Fri, 8 Jan 2021 17:15:14 +0000
From: Will Deacon <will@...nel.org>
To: linux-kernel@...r.kernel.org
Cc: linux-mm@...ck.org, linux-arm-kernel@...ts.infradead.org,
Will Deacon <will@...nel.org>,
Catalin Marinas <catalin.marinas@....com>,
Jan Kara <jack@...e.cz>, Minchan Kim <minchan@...nel.org>,
Andrew Morton <akpm@...ux-foundation.org>,
"Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Vinayak Menon <vinmenon@...eaurora.org>,
Hugh Dickins <hughd@...gle.com>, kernel-team@...roid.com
Subject: [PATCH v2 0/3] Create 'old' ptes for faultaround mappings on arm64 with hardware access flag
Hi all,
This is version two of the series I originally posted here:
https://lore.kernel.org/r/20201209163950.8494-1-will@kernel.org
The patches allow 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].
The big difference in this version is that I have reworked it based on
Kirill's patch which he posted as a follow-up to the original. However,
I can't tell where we've landed on that -- Linus seemed to like it, but
Hugh was less enthusiastic. I think that my subsequent patches are an
awful lot cleaner after the rework, but I don't think I necessarily
depend on everything in there so if that patch is likely to be a
sticking point then I can try to extract the parts I need.
Feedback welcome.
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@....com>
Cc: Jan Kara <jack@...e.cz>
Cc: Minchan Kim <minchan@...nel.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Vinayak Menon <vinmenon@...eaurora.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Hugh Dickins <hughd@...gle.com>
Cc: <kernel-team@...roid.com>
--->8
Kirill A. Shutemov (1):
mm: Cleanup faultaround and finish_fault() codepaths
Will Deacon (2):
mm: Allow architectures to request 'old' entries when prefaulting
arm64: mm: Implement arch_wants_old_prefaulted_pte()
arch/arm64/include/asm/pgtable.h | 12 +-
fs/xfs/xfs_file.c | 6 +-
include/linux/mm.h | 17 ++-
include/linux/pgtable.h | 11 ++
mm/filemap.c | 181 +++++++++++++++++++------
mm/memory.c | 219 +++++++++++--------------------
6 files changed, 251 insertions(+), 195 deletions(-)
--
2.29.2.729.g45daf8777d-goog
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