linux-kernel - [RFC PATCH v1 09/13] mm: introduce add-only version of pagevec_lru_move

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Date:   Wed, 31 Jan 2018 18:04:09 -0500
From:   daniel.m.jordan@...cle.com
To:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Cc:     aaron.lu@...el.com, ak@...ux.intel.com, akpm@...ux-foundation.org,
        Dave.Dice@...cle.com, dave@...olabs.net,
        khandual@...ux.vnet.ibm.com, ldufour@...ux.vnet.ibm.com,
        mgorman@...e.de, mhocko@...nel.org, pasha.tatashin@...cle.com,
        steven.sistare@...cle.com, yossi.lev@...cle.com
Subject: [RFC PATCH v1 09/13] mm: introduce add-only version of pagevec_lru_move_fn

For the purposes of this prototype, copy the body of pagevec_lru_move_fn
into __pagevec_lru_add so that it can be modified to use the batch
locking API while leaving all other callers of pagevec_lru_move_fn
unaffected.

Signed-off-by: Daniel Jordan <daniel.m.jordan@...cle.com>
---
 mm/swap.c | 24 +++++++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)

diff --git a/mm/swap.c b/mm/swap.c
index cf6a59f2cad6..2bb28fcb7cc0 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -902,7 +902,29 @@ static void __pagevec_lru_add_fn(struct page *page, struct lruvec *lruvec,
  */
 void __pagevec_lru_add(struct pagevec *pvec)
 {
-	pagevec_lru_move_fn(pvec, __pagevec_lru_add_fn, NULL);
+	int i;
+	struct pglist_data *pgdat = NULL;
+	struct lruvec *lruvec;
+	unsigned long flags = 0;
+
+	for (i = 0; i < pagevec_count(pvec); i++) {
+		struct page *page = pvec->pages[i];
+		struct pglist_data *pagepgdat = page_pgdat(page);
+
+		if (pagepgdat != pgdat) {
+			if (pgdat)
+				spin_unlock_irqrestore(&pgdat->lru_lock, flags);
+			pgdat = pagepgdat;
+			spin_lock_irqsave(&pgdat->lru_lock, flags);
+		}
+
+		lruvec = mem_cgroup_page_lruvec(page, pgdat);
+		__pagevec_lru_add_fn(page, lruvec, NULL);
+	}
+	if (pgdat)
+		spin_unlock_irqrestore(&pgdat->lru_lock, flags);
+	release_pages(pvec->pages, pvec->nr);
+	pagevec_reinit(pvec);
 }
 EXPORT_SYMBOL(__pagevec_lru_add);
 
-- 
2.16.1