From: "Kirill A. Shutemov" <kirill@shutemov.name>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Android Kernel Team <kernel-team@android.com>,
Jan Kara <jack@suse.cz>, Minchan Kim <minchan@kernel.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Hugh Dickins <hughd@google.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Linux-MM <linux-mm@kvack.org>,
Vinayak Menon <vinmenon@codeaurora.org>,
"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
Andrew Morton <akpm@linux-foundation.org>,
Will Deacon <will@kernel.org>,
Linux ARM <linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH v2 0/3] Create 'old' ptes for faultaround mappings on arm64 with hardware access flag
Date: Mon, 11 Jan 2021 17:24:02 +0300 [thread overview]
Message-ID: <20210111142402.6euyktmcnpemanf7@box> (raw)
In-Reply-To: <CAHk-=wg3UkUdiTbqWFx3zBLXv9VJHuNZAa5QyDvXiSmD4gX94A@mail.gmail.com>
On Fri, Jan 08, 2021 at 11:34:08AM -0800, Linus Torvalds wrote:
> I still dislike how we basically randomly modify the information in
> that 'vmf' thing.
I wounder if it would be acceptable to pass down to faultaround a copy
of vmf, so it mess with it without risking to corrupt the original one?
We would need to transfer back prealloc_pte, but the rest can be safely
discarded, I believe.
But it's somewhat wasteful of stack. sizeof(vmf) == 96 on x86-64.
--
Kirill A. Shutemov
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linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
WARNING: multiple messages have this Message-ID (diff)
From: "Kirill A. Shutemov" <kirill@shutemov.name>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Will Deacon <will@kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Linux-MM <linux-mm@kvack.org>,
Linux ARM <linux-arm-kernel@lists.infradead.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Jan Kara <jack@suse.cz>, Minchan Kim <minchan@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
Vinayak Menon <vinmenon@codeaurora.org>,
Hugh Dickins <hughd@google.com>,
Android Kernel Team <kernel-team@android.com>
Subject: Re: [PATCH v2 0/3] Create 'old' ptes for faultaround mappings on arm64 with hardware access flag
Date: Mon, 11 Jan 2021 17:24:02 +0300 [thread overview]
Message-ID: <20210111142402.6euyktmcnpemanf7@box> (raw)
In-Reply-To: <CAHk-=wg3UkUdiTbqWFx3zBLXv9VJHuNZAa5QyDvXiSmD4gX94A@mail.gmail.com>
On Fri, Jan 08, 2021 at 11:34:08AM -0800, Linus Torvalds wrote:
> I still dislike how we basically randomly modify the information in
> that 'vmf' thing.
I wounder if it would be acceptable to pass down to faultaround a copy
of vmf, so it mess with it without risking to corrupt the original one?
We would need to transfer back prealloc_pte, but the rest can be safely
discarded, I believe.
But it's somewhat wasteful of stack. sizeof(vmf) == 96 on x86-64.
--
Kirill A. Shutemov
next prev parent reply other threads:[~2021-01-11 14:29 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-08 17:15 [PATCH v2 0/3] Create 'old' ptes for faultaround mappings on arm64 with hardware access flag Will Deacon
2021-01-08 17:15 ` Will Deacon
2021-01-08 17:15 ` [PATCH v2 1/3] mm: Cleanup faultaround and finish_fault() codepaths Will Deacon
2021-01-08 17:15 ` Will Deacon
2021-01-11 14:26 ` Kirill A. Shutemov
2021-01-11 14:26 ` Kirill A. Shutemov
2021-01-11 14:27 ` Will Deacon
2021-01-11 14:27 ` Will Deacon
2021-01-08 17:15 ` [PATCH v2 2/3] mm: Allow architectures to request 'old' entries when prefaulting Will Deacon
2021-01-08 17:15 ` Will Deacon
2021-01-11 14:25 ` Kirill A. Shutemov
2021-01-11 14:25 ` Kirill A. Shutemov
2021-01-11 14:37 ` Will Deacon
2021-01-11 14:37 ` Will Deacon
2021-01-11 14:47 ` Kirill A. Shutemov
2021-01-11 14:47 ` Kirill A. Shutemov
2021-01-08 17:15 ` [PATCH v2 3/3] arm64: mm: Implement arch_wants_old_prefaulted_pte() Will Deacon
2021-01-08 17:15 ` Will Deacon
2021-01-08 19:34 ` [PATCH v2 0/3] Create 'old' ptes for faultaround mappings on arm64 with hardware access flag Linus Torvalds
2021-01-08 19:34 ` Linus Torvalds
2021-01-08 19:42 ` Linus Torvalds
2021-01-08 19:42 ` Linus Torvalds
2021-01-11 14:01 ` Will Deacon
2021-01-11 14:01 ` Will Deacon
2021-01-11 13:30 ` Will Deacon
2021-01-11 13:30 ` Will Deacon
2021-01-11 21:03 ` Hugh Dickins
2021-01-11 21:03 ` Hugh Dickins
2021-01-12 21:46 ` Will Deacon
2021-01-12 21:46 ` Will Deacon
2021-01-11 14:24 ` Kirill A. Shutemov [this message]
2021-01-11 14:24 ` Kirill A. Shutemov
2021-01-11 19:25 ` Linus Torvalds
2021-01-11 19:25 ` Linus Torvalds
2021-01-12 21:47 ` Will Deacon
2021-01-12 21:47 ` Will Deacon
2021-01-12 21:55 ` Linus Torvalds
2021-01-12 21:55 ` Linus Torvalds
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