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Subject[PATCH 1/3] mm: don't call activate_page() on new ksm pages
From
lru_cache_add_active_or_unevictable() already adds new ksm pages to
active lru. Calling activate_page() isn't really necessary in this
case.

Signed-off-by: Yu Zhao <yuzhao@google.com>
---
mm/swapfile.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/mm/swapfile.c b/mm/swapfile.c
index 6c26916e95fd..cf115ea26a20 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -1913,16 +1913,16 @@ static int unuse_pte(struct vm_area_struct *vma, pmd_t *pmd,
pte_mkold(mk_pte(page, vma->vm_page_prot)));
if (page == swapcache) {
page_add_anon_rmap(page, vma, addr, false);
+ /*
+ * Move the page to the active list so it is not
+ * immediately swapped out again after swapon.
+ */
+ activate_page(page);
} else { /* ksm created a completely new copy */
page_add_new_anon_rmap(page, vma, addr, false);
lru_cache_add_active_or_unevictable(page, vma);
}
swap_free(entry);
- /*
- * Move the page to the active list so it is not
- * immediately swapped out again after swapon.
- */
- activate_page(page);
out:
pte_unmap_unlock(pte, ptl);
if (page != swapcache) {
--
2.28.0.236.gb10cc79966-goog
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