From: Yu Zhao <yuzhao@google.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: "Alexander Duyck" <alexander.h.duyck@linux.intel.com>,
"Huang Ying" <ying.huang@intel.com>,
"David Hildenbrand" <david@redhat.com>,
"Michal Hocko" <mhocko@suse.com>,
"Yang Shi" <yang.shi@linux.alibaba.com>, "Qian Cai" <cai@lca.pw>,
"Mel Gorman" <mgorman@suse.de>,
"Nicholas Piggin" <npiggin@gmail.com>,
"Jérôme Glisse" <jglisse@redhat.com>,
"Hugh Dickins" <hughd@google.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
"Yu Zhao" <yuzhao@google.com>
Subject: [PATCH 1/3] mm: don't call activate_page() on new ksm pages
Date: Tue, 11 Aug 2020 22:04:23 -0600 [thread overview]
Message-ID: <20200812040423.2707213-1-yuzhao@google.com> (raw)
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
next reply other threads:[~2020-08-12 4:04 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-12 4:04 Yu Zhao [this message]
2020-08-13 5:19 ` [PATCH 1/3] mm: don't call activate_page() on new ksm pages Yang Shi
2020-08-13 7:34 ` Yu Zhao
2020-08-17 20:48 ` Yang Shi
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