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mm/huge_memory: try to free subpage in swapcache when possible

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Subpages in swapcache won't be freed even if it is the last user of the
page until next time reclaim. It shouldn't hurt indeed, but we could try
to free these pages to save more memory for system.

Link: https://lkml.kernel.org/r/20220704132201.14611-12-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: Yang Shi <shy828301@gmail.com>
Cc: Zach O'Keefe <zokeefe@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Miaohe Lin 2022-07-04 21:21:56 +08:00 committed by akpm
parent 3ce4fee440
commit 0b175468a0
1 changed files with 1 additions and 1 deletions
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2
mm/huge_memory.c
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@ -2538,7 +2538,7 @@ static void __split_huge_page(struct page *page, struct list_head *list,
* requires taking the lru_lock so we do the put_page
* of the tail pages after the split is complete.
*/
put_page(subpage);
free_page_and_swap_cache(subpage);
}
}