From: Miaohe Lin Date: Wed, 5 May 2021 01:37:39 +0000 (-0700) Subject: ksm: use GET_KSM_PAGE_NOLOCK to get ksm page in remove_rmap_item_from_tree() X-Git-Tag: accepted/tizen/unified/20230118.172025~7280^2~51 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=3e96b6a2e9ad929a3230a22f4d64a74671a0720b;p=platform%2Fkernel%2Flinux-rpi.git ksm: use GET_KSM_PAGE_NOLOCK to get ksm page in remove_rmap_item_from_tree() 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 Cc: Hugh Dickins Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/mm/ksm.c b/mm/ksm.c index 7b6bc10..31dcbd4 100644 --- a/mm/ksm.c +++ b/mm/ksm.c @@ -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))