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ksm: use GET_KSM_PAGE_NOLOCK to get ksm page in remove_rmap_item_from_tree()

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It's unnecessary to lock the page when get ksm page if we're going to
remove the rmap item as page migration is irrelevant in this case.  Use
GET_KSM_PAGE_NOLOCK instead to save some page lock cycles.

Link: https://lkml.kernel.org/r/20210330140228.45635-3-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Miaohe Lin 2021-05-04 18:37:39 -07:00 committed by Linus Torvalds
parent a08e1e11c9
commit 3e96b6a2e9
1 changed files with 1 additions and 2 deletions
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3
mm/ksm.c
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@ -778,12 +778,11 @@ static void remove_rmap_item_from_tree(struct rmap_item *rmap_item)
struct page *page;
stable_node = rmap_item->head;
page = get_ksm_page(stable_node, GET_KSM_PAGE_LOCK);
page = get_ksm_page(stable_node, GET_KSM_PAGE_NOLOCK);
if (!page)
goto out;
hlist_del(&rmap_item->hlist);
unlock_page(page);
put_page(page);
if (!hlist_empty(&stable_node->hlist))