Re: pte_young/pte_mkold/pte_mkyoung

[Hugh Dickins <hugh@veritas.com>]

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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