On Mon, 2017-07-24 at 13:18 +0800, Huang, Ying wrote: > From: Huang Ying <[email protected]> > > The normal swap slot reclaiming can be done when the swap count > reaches SWAP_HAS_CACHE. But for the swap slot which is backing a > THP, > all swap slots backing one THP must be reclaimed together, because > the > swap slot may be used again when the THP is swapped out again later. > So the swap slots backing one THP can be reclaimed together when the > swap count for all swap slots for the THP reached SWAP_HAS_CACHE. In > the patch, the functions to check whether the swap count for all swap > slots backing one THP reached SWAP_HAS_CACHE are implemented and used > when checking whether a swap slot can be reclaimed. > > To make it easier to determine whether a swap slot is backing a THP, > a > new swap cluster flag named CLUSTER_FLAG_HUGE is added to mark a swap > cluster which is backing a THP (Transparent Huge Page). Because THP > swap in as a whole isn't supported now. After deleting the THP from > the swap cache (for example, swapping out finished), the > CLUSTER_FLAG_HUGE flag will be cleared. So that, the normal pages > inside THP can be swapped in individually. > > Signed-off-by: "Huang, Ying" <[email protected]> > Cc: Johannes Weiner <[email protected]> > Cc: Minchan Kim <[email protected]> > Cc: Hugh Dickins <[email protected]> > Cc: Shaohua Li <[email protected]> > Cc: Rik van Riel <[email protected]> > Acked-by: Rik van Riel <[email protected]>
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