Re: [PATCH -mm -v3 01/12] mm, THP, swap: Support to clear swap cache flag for THP swapped out

[Rik van Riel]

On Mon, 2017-07-24 at 13:18 +0800, Huang, Ying wrote:
> From: Huang Ying <ying.huang@xxxxxxxxx>
> 
> Previously, swapcache_free_cluster() is used only in the error path
> of
> shrink_page_list() to free the swap cluster just allocated if the
> THP (Transparent Huge Page) is failed to be split.ÂÂIn this patch, it
> is enhanced to clear the swap cache flag (SWAP_HAS_CACHE) for the
> swap
> cluster that holds the contents of THP swapped out.
> 
> This will be used in delaying splitting THP after swapping out
> support.ÂÂBecause there is no THP swapping in as a whole support yet,
> after clearing the swap cache flag, the swap cluster backing the THP
> swapped out will be split.ÂÂSo that the swap slots in the swap
> cluster
> can be swapped in as normal pages later.
> 
> Signed-off-by: "Huang, Ying" <ying.huang@xxxxxxxxx>
> Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
> Cc: Minchan Kim <minchan@xxxxxxxxxx>
> Cc: Hugh Dickins <hughd@xxxxxxxxxx>
> Cc: Shaohua Li <shli@xxxxxxxxxx>
> Cc: Rik van Riel <riel@xxxxxxxxxx>
> 

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

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