Re: [PATCH] mm: make faultaround produce old ptes

[Rik van Riel <riel@redhat.com>]

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On Tue, 2016-05-17 at 15:32 +0300, Kirill A. Shutemov wrote:
> Currently, faultaround code produces young pte. This can screw up
> vmscan
> behaviour[1], as it makes vmscan think that these pages are hot and
> not
> push them out on first round.
> 
> Let modify faultaround to produce old pte, so they can easily be
> reclaimed under memory pressure.
> 
> This can to some extend defeat purpose of faultaround on machines
> without hardware accessed bit as it will not help up with reducing
> number of minor page faults.
> 
> We may want to disable faultaround on such machines altogether, but
> that's subject for separate patchset.
> 
> [1] https://lkml.kernel.org/r/1460992636-711-1-git-send-email-vinmeno
> n@codeaurora.org
> 
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
> Cc: Mel Gorman <mgorman@suse.de>
> Cc: Rik van Riel <riel@redhat.com>
> Cc: Michal Hocko <mhocko@kernel.org>
> Cc: Vinayak Menon <vinmenon@codeaurora.org>
> Cc: Minchan Kim <minchan@kernel.org>
> 
Acked-by: Rik van Riel <riel@redhat.com>

-- 
All Rights Reversed.


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