From: Alex Shi <alex.shi@linux.alibaba.com>
To: vbabka@suse.cz, alex.shi@linux.alibaba.com
Cc: Konstantin Khlebnikov <koct9i@gmail.com>,
Hugh Dickins <hughd@google.com>, Yu Zhao <yuzhao@google.com>,
Michal Hocko <mhocko@suse.com>,
"Matthew Wilcox (Oracle)" <willy@infradead.org>,
Andrew Morton <akpm@linux-foundation.org>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: [PATCH 2/3] mm/swap.c: bail out early for no memcg and no numa
Date: Tue, 1 Dec 2020 16:02:14 +0800 [thread overview]
Message-ID: <1606809735-43300-2-git-send-email-alex.shi@linux.alibaba.com> (raw)
In-Reply-To: <1606809735-43300-1-git-send-email-alex.shi@linux.alibaba.com>
If a system has memcg disabled and no numa node, like a embedded system,
there is no needs to do the pagevec sort, since only just one lruvec in
system. In this situation, we could skip the pagevec sorting.
Signed-off-by: Alex Shi <alex.shi@linux.alibaba.com>
Cc: Konstantin Khlebnikov <koct9i@gmail.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Yu Zhao <yuzhao@google.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-mm@kvack.org
Cc: linux-kernel@vger.kernel.org
---
mm/swap.c | 19 ++++++++++++-------
1 file changed, 12 insertions(+), 7 deletions(-)
diff --git a/mm/swap.c b/mm/swap.c
index 17d8990e5ca7..814809845700 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -264,12 +264,17 @@ static void pagevec_lru_move_fn(struct pagevec *pvec,
unsigned long flags = 0;
unsigned long lvaddr[PAGEVEC_SIZE];
struct pagevec isopv;
+ struct pagevec *pv;
- pagevec_init(&isopv);
-
- sort_isopv(pvec, &isopv, lvaddr);
+ if (!mem_cgroup_disabled() || num_online_nodes() > 1) {
+ pagevec_init(&isopv);
+ sort_isopv(pvec, &isopv, lvaddr);
+ pv = &isopv;
+ } else {
+ pv = pvec;
+ }
- n = pagevec_count(&isopv);
+ n = pagevec_count(pv);
if (!n)
return;
@@ -284,12 +289,12 @@ static void pagevec_lru_move_fn(struct pagevec *pvec,
spin_lock_irqsave(&lruvec->lru_lock, flags);
}
- (*move_fn)(isopv.pages[i], lruvec);
+ (*move_fn)(pv->pages[i], lruvec);
- SetPageLRU(isopv.pages[i]);
+ SetPageLRU(pv->pages[i]);
}
spin_unlock_irqrestore(&lruvec->lru_lock, flags);
- release_pages(isopv.pages, isopv.nr);
+ release_pages(pv->pages, pv->nr);
}
static void pagevec_move_tail_fn(struct page *page, struct lruvec *lruvec)
--
2.29.GIT
next prev parent reply other threads:[~2020-12-01 8:02 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-20 8:27 [PATCH next] mm/swap.c: reduce lock contention in lru_cache_add Alex Shi
2020-11-20 23:19 ` Andrew Morton
2020-11-23 4:46 ` Alex Shi
2020-11-25 15:38 ` Vlastimil Babka
2020-11-26 3:12 ` Alex Shi
2020-11-26 11:05 ` Vlastimil Babka
2020-11-26 4:52 ` Yu Zhao
2020-11-26 6:39 ` Alex Shi
2020-11-26 7:24 ` Yu Zhao
2020-11-26 8:09 ` Alex Shi
2020-11-26 11:22 ` Vlastimil Babka
2020-11-26 15:44 ` Vlastimil Babka
2020-11-26 15:55 ` Matthew Wilcox
2020-11-27 3:14 ` Alex Shi
2020-12-01 8:02 ` [PATCH 1/3] mm/swap.c: pre-sort pages in pagevec for pagevec_lru_move_fn Alex Shi
2020-12-01 8:02 ` Alex Shi [this message]
2020-12-01 8:02 ` [PATCH 3/3] mm/swap.c: extend the usage to pagevec_lru_add Alex Shi
2020-12-01 8:10 ` [PATCH 1/3] mm/swap.c: pre-sort pages in pagevec for pagevec_lru_move_fn Michal Hocko
2020-12-01 8:20 ` Alex Shi
2020-12-25 9:59 ` [RFC PATCH 0/4] pre sort pages on lruvec in pagevec Alex Shi
2020-12-25 9:59 ` [RFC PATCH 1/4] mm/swap.c: pre-sort pages in pagevec for pagevec_lru_move_fn Alex Shi
2020-12-25 9:59 ` [RFC PATCH 2/4] mm/swap.c: bail out early for no memcg and no numa Alex Shi
2020-12-25 9:59 ` [RFC PATCH 3/4] mm/swap.c: extend the usage to pagevec_lru_add Alex Shi
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