From: Muchun Song <songmuchun@bytedance.com>
To: guro@fb.com, hannes@cmpxchg.org, mhocko@kernel.org,
akpm@linux-foundation.org, shakeelb@google.com,
vdavydov.dev@gmail.com
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
duanxiongchun@bytedance.com,
Muchun Song <songmuchun@bytedance.com>
Subject: [PATCH v4 3/5] mm: memcontrol: change ug->dummy_page only if memcg changed
Date: Thu, 18 Mar 2021 19:06:56 +0800 [thread overview]
Message-ID: <20210318110658.60892-4-songmuchun@bytedance.com> (raw)
In-Reply-To: <20210318110658.60892-1-songmuchun@bytedance.com>
Just like assignment to ug->memcg, we only need to update ug->dummy_page
if memcg changed. So move it to there. This is a very small optimization.
Signed-off-by: Muchun Song <songmuchun@bytedance.com>
---
mm/memcontrol.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index fc22da9805fb..104bddf21314 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -6845,6 +6845,7 @@ static void uncharge_page(struct page *page, struct uncharge_gather *ug)
uncharge_gather_clear(ug);
}
ug->memcg = page_memcg(page);
+ ug->dummy_page = page;
/* pairs with css_put in uncharge_batch */
css_get(&ug->memcg->css);
@@ -6858,7 +6859,6 @@ static void uncharge_page(struct page *page, struct uncharge_gather *ug)
else
ug->pgpgout++;
- ug->dummy_page = page;
page->memcg_data = 0;
css_put(&ug->memcg->css);
}
--
2.11.0
next prev parent reply other threads:[~2021-03-18 11:09 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-18 11:06 [PATCH v4 0/5] Use obj_cgroup APIs to charge kmem pages Muchun Song
2021-03-18 11:06 ` [PATCH v4 1/5] mm: memcontrol: introduce obj_cgroup_{un}charge_pages Muchun Song
2021-03-18 11:06 ` [PATCH v4 2/5] mm: memcontrol: directly access page->memcg_data in mm/page_alloc.c Muchun Song
2021-03-18 15:09 ` Johannes Weiner
2021-03-19 1:00 ` Shakeel Butt
2021-03-18 11:06 ` Muchun Song [this message]
2021-03-18 15:11 ` [PATCH v4 3/5] mm: memcontrol: change ug->dummy_page only if memcg changed Johannes Weiner
2021-03-19 1:22 ` Shakeel Butt
2021-03-18 11:06 ` [PATCH v4 4/5] mm: memcontrol: use obj_cgroup APIs to charge kmem pages Muchun Song
2021-03-18 15:23 ` Johannes Weiner
2021-03-19 3:39 ` Shakeel Butt
2021-03-19 4:05 ` [External] " Muchun Song
2021-03-19 13:59 ` Shakeel Butt
2021-03-19 15:45 ` Muchun Song
2021-03-18 11:06 ` [PATCH v4 5/5] mm: memcontrol: move PageMemcgKmem to the scope of CONFIG_MEMCG_KMEM Muchun Song
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