Re: [PATCH 1/2] mm: avoid marking swap cached page as lazyfree

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On Thu, 2017-09-21 at 13:27 -0700, Shaohua Li wrote:
> From: Shaohua Li <shli@xxxxxx>
> 
> MADV_FREE clears pte dirty bit and then marks the page lazyfree
> (clear
> SwapBacked). There is no lock to prevent the page is added to swap
> cache
> between these two steps by page reclaim. If the page is added to swap
> cache, marking the page lazyfree will confuse page fault if the page
> is
> reclaimed and refault.
> 
> Reported-and-tested-y: Artem Savkov <asavkov@xxxxxxxxxx>
> Fix: 802a3a92ad7a(mm: reclaim MADV_FREE pages)
> Signed-off-by: Shaohua Li <shli@xxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx
> Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
> Cc: Michal Hocko <mhocko@xxxxxxxx>
> Cc: Hillf Danton <hillf.zj@xxxxxxxxxxxxxxx>
> Cc: Minchan Kim <minchan@xxxxxxxxxx>
> Cc: Hugh Dickins <hughd@xxxxxxxxxx>
> Cc: Rik van Riel <riel@xxxxxxxxxx>
> Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
> 
Reviewed-by: Rik van Riel <riel@xxxxxxxxxx>



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