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authorMiaohe Lin2021-05-04 18:37:39 -0700
committerLinus Torvalds2021-05-05 11:27:24 -0700
commit3e96b6a2e9ad929a3230a22f4d64a74671a0720b (patch)
tree855d56c528bc6166cef1dc7eb08997d72db4753a /mm/ksm.c
parenta08e1e11c90f3e6020963b3ad097680768bc8567 (diff)
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 <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>
Diffstat (limited to 'mm/ksm.c')
-rw-r--r--mm/ksm.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/mm/ksm.c b/mm/ksm.c
index 7b6bc1036596..31dcbd4d3ac9 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))