From: "Kirill A. Shutemov" <kirill@shutemov.name>
To: Will Deacon <will.deacon@arm.com>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
linux-arch@vger.kernel.org, akpm@linux-foundation.org,
mhocko@suse.cz, Andrea Arcangeli <aarcange@redhat.com>,
Chris Metcalf <cmetcalf@tilera.com>,
Steve Capper <steve.capper@arm.com>
Subject: Re: [PATCH v2] mm: thp: Set the accessed flag for old pages on access fault.
Date: Fri, 5 Oct 2012 01:13:54 +0300 [thread overview]
Message-ID: <20121004221353.GA11454@shutemov.name> (raw)
In-Reply-To: <1349197151-19645-1-git-send-email-will.deacon@arm.com>
On Tue, Oct 02, 2012 at 05:59:11PM +0100, Will Deacon wrote:
> On x86 memory accesses to pages without the ACCESSED flag set result in the
> ACCESSED flag being set automatically. With the ARM architecture a page access
> fault is raised instead (and it will continue to be raised until the ACCESSED
> flag is set for the appropriate PTE/PMD).
>
> For normal memory pages, handle_pte_fault will call pte_mkyoung (effectively
> setting the ACCESSED flag). For transparent huge pages, pmd_mkyoung will only
> be called for a write fault.
>
> This patch ensures that faults on transparent hugepages which do not result
> in a CoW update the access flags for the faulting pmd.
>
> Cc: Andrea Arcangeli <aarcange@redhat.com>
> Cc: Chris Metcalf <cmetcalf@tilera.com>
> Signed-off-by: Steve Capper <steve.capper@arm.com>
> Signed-off-by: Will Deacon <will.deacon@arm.com>
Acked-by: Kirill A. Shutemov <kirill@shutemov.name>
--
Kirill A. Shutemov
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prev parent reply other threads:[~2012-10-04 22:13 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-02 16:59 [PATCH v2] mm: thp: Set the accessed flag for old pages on access fault Will Deacon
2012-10-02 17:46 ` Andrea Arcangeli
2012-10-02 22:01 ` Andrew Morton
2012-10-03 9:09 ` Will Deacon
2012-10-17 13:01 ` Will Deacon
2012-10-17 15:26 ` David Miller
2012-10-17 15:54 ` Will Deacon
2012-10-18 22:05 ` Andrew Morton
2012-10-19 9:10 ` Will Deacon
2012-10-19 18:49 ` Andrew Morton
2012-10-22 10:35 ` Will Deacon
2012-10-22 18:18 ` Andrew Morton
2012-10-23 10:11 ` Will Deacon
2012-10-23 21:50 ` Andrew Morton
2012-10-24 9:35 ` Will Deacon
2012-10-04 22:13 ` Kirill A. Shutemov [this message]
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