From: Hugh Dickins <hugh@veritas.com>
To: rmk@arm.linux.org.uk
Cc: linux-mm@kvack.org
Subject: Re: pte_young/pte_mkold/pte_mkyoung
Date: Wed, 4 Apr 2001 17:13:44 +0100 (BST) [thread overview]
Message-ID: <Pine.LNX.4.21.0104041711060.1126-100000@localhost.localdomain> (raw)
In-Reply-To: <200104041600.RAA01119@raistlin.arm.linux.org.uk>
On Wed, 4 Apr 2001 rmk@arm.linux.org.uk wrote:
>
> We currently seem to have:
> 2 references to pte_mkyoung()
> 1 reference to pte_mkold()
> 0 references to pte_young()
>
> This tells me that we're no longer using the hardware page tables on x86
> for page aging, which leads me nicely on to the following question.
>
> Are there currently any plans to use the hardware page aging bits in the
> future, and if there are, would architectures that don't have them be
> required to have them?
>
> I'm asking this question because for some time (1.3 onwards), the ARM
> architecture has had some code to handle software emulation of the young
> and dirty bits. If its not required, then I'd like to get rid of this
> software emulation.
You may be out of luck: mm/vmscan.c try_to_swap_out() has
if (ptep_test_and_clear_young(page_table)) {
Hugh
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next prev parent reply other threads:[~2001-04-04 16:12 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-04-04 16:00 pte_young/pte_mkold/pte_mkyoung rmk
2001-04-04 16:13 ` Hugh Dickins [this message]
2001-04-04 16:15 ` pte_young/pte_mkold/pte_mkyoung Rik van Riel
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