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mm, THP, swap: move anonymous THP split logic to vmscan

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The add_to_swap aims to allocate swap_space(ie, swap slot and swapcache)
so if it fails due to lack of space in case of THP or something(hdd swap
but tries THP swapout) *caller* rather than add_to_swap itself should
split the THP page and retry it with base page which is more natural.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Minchan Kim <[email protected]>
Signed-off-by: "Huang, Ying" <[email protected]>
Acked-by: Johannes Weiner <[email protected]>
Cc: Andrea Arcangeli <[email protected]>
Cc: Ebru Akagunduz <[email protected]>
Cc: Hugh Dickins <[email protected]>
Cc: Kirill A. Shutemov <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Rik van Riel <[email protected]>
Cc: Shaohua Li <[email protected]>
Cc: Tejun Heo <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Minchan Kim 2017-07-06 15:37:24 -07:00 • committed by Linus Torvalds
commit 0f0746589e
3 changed files with 24 additions and 20 deletions
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17
mm/vmscan.c
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@ -1125,8 +1125,23 @@ static unsigned long shrink_page_list(struct list_head *page_list,
!PageSwapCache(page)) {
if (!(sc->gfp_mask & __GFP_IO))
goto keep_locked;
if (!add_to_swap(page, page_list))
if (!add_to_swap(page)) {
if (!PageTransHuge(page))
goto activate_locked;
/* Split THP and swap individual base pages */
if (split_huge_page_to_list(page, page_list))
goto activate_locked;
if (!add_to_swap(page))
goto activate_locked;
}
/* XXX: We don't support THP writes */
if (PageTransHuge(page) &&
split_huge_page_to_list(page, page_list)) {
delete_from_swap_cache(page);
goto activate_locked;
}
may_enter_fs = 1;
/* Adding to swap updated mapping */