Re: [PATCH] mm: Fix to infinite churning of mlocked page

[Rik van Riel]

Minchan Kim wrote:
> Mlocked page might lost the isolatation race.
> It cause the page to clear PG_mlocked while it remains
> in VM_LOCKED vma. It means it can be put [in]active list.
> We can rescue it by try_to_unmap in shrink_page_list.
>
> But now, As Wu Fengguang pointed out, vmscan have a bug.
> If the page has PG_referenced, it can't reach try_to_unmap
> in shrink_page_list but put into active list. If the page
> is referenced repeatedly, it can remain [in]active list
> without moving unevictable list.
>
> This patch can fix it.
>
> Reported-by: Wu Fengguang <fengguang.wu@xxxxxxxxx>
> Signed-off-by: Minchan Kim <minchan.kim@xxxxxxxxx>
> Cc: KOSAKI Motohiro <<kosaki.motohiro@xxxxxxxxxxxxxx>
> Cc: Lee Schermerhorn <lee.schermerhorn@xxxxxx>
> Cc: Rik van Riel <riel@xxxxxxxxxx>

Acked-by: Rik van Riel <riel@xxxxxxxxxx>

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